PATENT DOCUMENT

Publication Number: US-11955696-B2
Application Number: US-202117480255-A
Country: US
Kind Code: B2

Title: Housing and antenna architecture for mobile device

Abstract:
A device includes a display and a housing. The housing surrounds the display and has four corners defining portions of an exterior surface of the device. The housing includes a first housing segment defining at least part of a first corner of the four corners and configured to operate as an antenna; a second housing segment defining at least part of a second corner of the four corners; and a third housing segment defining at least part of a third corner of the four corners. The third corner forms part of the housing diagonally opposite the second corner. The housing further includes a non-conductive housing component that structurally couples the first housing segment to another portion of the housing.

Claims:
What is claimed is: 
     
       1. A mobile phone, comprising:
 a display; 
 a front cover positioned over the display; 
 a rear cover positioned behind the display; 
 a multi-segment housing positioned between and electrically insulated from the front cover and the rear cover, the multi-segment housing comprising:
 a first segment defining a first corner and a first portion of a first side of the multi-segment housing, the first segment operable as a first antenna; 
 a second segment defining a second corner, a second portion of the first side, and a first portion of a second side, the second segment operable as a second antenna; 
 a first conductive segment defining a third portion of the first side; 
 a first non-conductive segment positioned between the first segment and the first conductive segment and defining a fourth portion of the first side; 
 a second non-conductive segment positioned between the second segment and the first conductive segment and defining a fifth portion of the first side; and 
 a third non-conductive segment defining a second portion of the second side. 
 
 
     
     
       2. The mobile phone of  claim 1 , wherein the first non-conductive segment and the second non-conductive segment are defined by a contiguous non-conductive structure. 
     
     
       3. The mobile phone of  claim 1 , wherein the multi-segment housing further comprises:
 a third segment defining a third corner and a third portion of the second side, the third segment operable as a third antenna. 
 
     
     
       4. The mobile phone of  claim 3 , wherein the third non-conductive segment fills a gap between the second segment and the third segment. 
     
     
       5. The mobile phone of  claim 3 , wherein the first segment and the third segment have different lengths. 
     
     
       6. The mobile phone of  claim 3 , wherein the multi-segment housing further comprises:
 a fourth segment defining a fourth corner and operable as a fourth antenna. 
 
     
     
       7. The mobile phone of  claim 3 , wherein the multi-segment housing further comprises:
 a fourth segment defining a fourth corner and operable as a fourth antenna; 
 a fourth non-conductive segment positioned between the third segment and the fourth segment and defining a first portion of a third side; and 
 a fifth non-conductive segment positioned between the first segment and the fourth segment and defining a first portion of a fourth side; wherein, 
 the third non-conductive segment, the fourth non-conductive segment, and the fifth non-conductive segment are defined by a contiguous non-conductive structure. 
 
     
     
       8. The mobile phone of  claim 1 , further comprising:
 wireless communication circuitry; wherein, 
 the multi-segment housing further comprises:
 a third segment operable as a third antenna; and 
 a fourth segment operable as a fourth antenna; and 
 
 the wireless communication circuitry is configured to communicate in a 4×4 multiple-input multiple-output (MIMO) wireless communication mode using the first segment, the second segment, the third segment, and the fourth segment. 
 
     
     
       9. The mobile phone of  claim 8 , wherein the wireless communication circuitry is further configured to communicate in a 2×2 MIMO wireless communication mode using the first segment and the third segment. 
     
     
       10. A mobile phone, comprising:
 a display; 
 a housing extending around a perimeter of the display, the housing comprising:
 a first antenna defining a first corner of the housing, a first portion of a first side of the housing, and a first portion of a second side of the housing, the first portion of the first side longer than the first portion of the second side; 
 a second antenna defining a second corner of the housing, a first portion of a third side of the housing, and a first portion of a fourth side of the housing; and 
 a set of electrical insulators including a first electrical insulator positioned on the first side of the housing adjacent a first end of the first antenna, a second electrical insulator positioned on the second side of the housing adjacent a second end of the first antenna, a third electrical insulator positioned on the third side of the housing adjacent a first end of the second antenna, and a fourth electrical insulator positioned on the fourth side of the housing adjacent a second end of the second antenna. 
 
 
     
     
       11. The mobile phone of  claim 10 , wherein:
 the first side is opposite the third side; and 
 the first portion of the first side is longer than the first portion of the third side. 
 
     
     
       12. The mobile phone of  claim 11 , wherein the first portion of the fourth side is longer than the first portion of the second side. 
     
     
       13. The mobile phone of  claim 10 , wherein the housing further comprises:
 a third antenna defining a third corner of the housing, a second portion of the second side of the housing, and a second portion of the third side of the housing; and 
 the second portion of the second side is longer than the first portion of the second side. 
 
     
     
       14. The mobile phone of  claim 13 , wherein the first portion of the first side is longer than the second portion of the third side. 
     
     
       15. The mobile phone of  claim 10 , wherein the housing further comprises:
 a first conductive segment defining a third corner of the housing; and 
 a second conductive segment defining a fourth corner of the housing. 
 
     
     
       16. The mobile phone of  claim 15 , wherein at least one of:
 the first conductive segment is operable as a third antenna; or 
 the second conductive segment is operable as a fourth antenna. 
 
     
     
       17. The mobile phone of  claim 15 , further comprising:
 wireless communication circuitry electrically coupled to the first antenna, the second antenna, and at least one of the first conductive segment or the second conductive segment. 
 
     
     
       18. The mobile phone of  claim 10 , wherein:
 the housing further comprises a third antenna defining a third corner of the housing, a second portion of the first side of the housing, and a second portion of the fourth side of the housing; and 
 the set of electrical insulators comprises a monolithic piece of material extending between the first antenna and the third antenna, and between the second antenna and the third antenna. 
 
     
     
       19. The mobile phone of  claim 10 , wherein the housing further comprises:
 a front cover attached to the housing; and 
 a rear cover attached to the housing; wherein, 
 the display is viewable through the front cover. 
 
     
     
       20. The mobile phone of  claim 19 , further comprising:
 a camera brace attached to the rear cover; wherein, 
 the first antenna extends along two sides of the camera brace.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation patent application of U.S. patent application Ser. No. 16/142,285, filed Sep. 26, 2018 and titled “Housing and Antenna Architecture for Mobile Device,” which is a nonprovisional patent application of and claims the benefit of U.S. Provisional Patent Application No. 62/725,237, filed Aug. 30, 2018 and titled “Housing and Antenna Architecture for Mobile Device”, the disclosures of which are hereby incorporated herein by reference in their entireties. 
    
    
     FIELD 
     The described embodiments generally relate to a housing and antenna architecture for a mobile device. More particularly, the described embodiments relate to a segmented housing in which housing segments may be positioned at each of one or more corners defining portions of an exterior surface of the device. In some embodiments, one or more of the housing segments may be operable as an antenna for the device. 
     BACKGROUND 
     Portable electronic devices have become more compact over the years. There is an increasing need to make housings that are both aesthetically pleasing and structurally robust. Some traditional housings are formed from a single material in order to simplify manufacturing and assembly. However, a single-piece housing may not provide some of the structural, functional, and/or aesthetic benefits of a multi-segment housing, as described herein. The devices, housings, and components described herein, and the corresponding methods of manufacture described herein, may be used to improve the manufacturability and function of multi-segment housings while maintaining the benefits of multi-segment housings. 
     SUMMARY 
     Some example embodiments are directed to multi-segment housings that include multiple conductive segments. The multiple conductive segments may be structurally coupled by one or more non-conductive housing components, which non-conductive housing components may define segments or splits between the conductive segments. One or more of the conductive segments may be configured to operate as an antenna, and the non-conductive housing component(s) may provide electrical insulation between a conductive segment and one or more other conductive segments or components. In some embodiments, a sidewall of a device may have a generally rectangular shape, and four different conductive segments may define four different corners about the sidewall. Each of the four different conductive segments may be configured to operate as a different antenna when the device wirelessly communicates with other devices, or different combinations of the conductive segments may be configured for wireless communication in different wireless communication modes. 
     In a first aspect, the present disclosure describes a device including a display and a housing. The housing may surround the display and have four corners defining portions of an exterior surface of the device. The housing may include a first housing segment defining at least part of a first corner of the four corners, a second housing segment defining at least part of a second corner of the four corners, a third housing segment defining at least part of a third corner of the four corners, and a non-conductive housing component that structurally couples the first housing segment to another portion of the housing. The third corner may form part of the housing diagonally opposite the second corner. The first housing segment may be configured to operate as an antenna. 
     In another aspect, the present disclosure describes a device including a display, a housing, and wireless communication circuitry. The housing may define a sidewall of the device surrounding a perimeter of the display. The housing may include a first conductive segment defining at least part of a first corner of the sidewall, a second conductive segment defining at least part of a second corner of the sidewall, a third conductive segment defining at least part of a third corner of the sidewall, a fourth conductive segment defining at least part of a fourth corner of the sidewall, and a non-conductive housing component that structurally couples the first conductive segment to the second conductive segment and electrically insulates the first conductive segment from the second conductive segment. The wireless communication circuitry may be coupled to at least the first conductive segment. 
     In still another aspect of the disclosure, a device includes a display, a housing, and wireless communication circuitry. The housing may define a sidewall of the device and at least partially define an interior volume including the display. The housing may include a first conductive antenna segment defining a first portion of the sidewall, a second conductive antenna segment defining a second portion of the sidewall, and a non-conductive housing component defining a third portion of the sidewall and electrically insulating the second conductive antenna segment from the first conductive antenna segment. The wireless communication circuitry may be disposed within the interior volume. The wireless communication circuitry may be operable in a first wireless communication with the second conductive antenna segment electrically disconnected from the first conductive antenna segment, and in a second wireless communication mode with the second conductive antenna segment electrically connected to the first conductive antenna segment. 
     In another aspect, the present disclosure describes a device including a display and a housing. The housing may define a sidewall of the device and an interior volume including the display. The housing may include a first housing segment defining a first portion of the sidewall and a first interlock feature extending into the interior volume. The first interlock feature may have a first interlock surface and a first hole extending into the first interlock surface. The housing may also include a second housing segment defining a second portion of the sidewall and a second interlock feature extending into the interior volume. The second interlock feature may have a second interlock surface opposite to the first interlock surface and a second hole extending into the second interlock surface. A non-conductive housing component may at least partially fill the first hole and the second hole, thereby structurally coupling the first housing segment to the second housing segment. 
     In yet another aspect, the present disclosure describes another device including a display and a housing. The housing may at least partially surround the display and include a first housing segment defining at least a first portion of an exterior surface of the device and a first interlock feature. The first interlock feature may have an interlock surface that is offset with respect to an end surface of the first housing segment, and the first interlock feature may have a first opening formed in the interlock surface. The housing may also include a second housing segment defining at least a second portion of the exterior surface of the device and a second interlock feature. The second interlock feature may have a second opening aligned with the first opening. The housing may further include a non-conductive housing component defining a third portion of the exterior surface of the device. The non-conductive housing component may extend into the first opening and the second opening. 
     In still another aspect of the disclosure, a device includes a display and a housing, with the housing defining a sidewall that extends around the display. The housing may include a first housing segment defining a first portion of the sidewall and a first interlock feature having a first hole, a second housing segment defining a second portion of the sidewall and a second interlock feature having a second hole, and a non-conductive housing component. The second hole may be substantially aligned with the first hole, and the non-conductive housing component may at least partially fill the first hole and the second hole, thereby structurally coupling the first housing segment to the second housing segment. 
     In addition to the aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the drawings and by study of the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which: 
         FIGS.  1 A- 1 C  show an example of an electronic device such as a mobile phone or tablet computer; 
         FIGS.  2 A- 2 E  show a number of different configurations for a multi-segment housing that forms a sidewall of a device; 
         FIGS.  3 A- 3 C  show example implementations of the first, second, third, and fourth housing segments described with reference to  FIGS.  1 A- 1 C &amp;  2 A , and show example positions of the housing segments with respect to a support plate; 
         FIG.  4    shows each of the first, second, third, fourth, fifth, and sixth housing segments described with reference to  FIGS.  1 A- 1 C &amp;  2 A  in relation to the support plate described with reference to  FIGS.  3 A- 3 C , and a non-conductive housing component that structurally couples the housing segments to each other and/or the support plate; 
         FIGS.  5 A- 10 C  show several interior views of example implementations of the housing segments described with reference to  FIGS.  2 A,  3 A- 3 C , &amp;  4 ; 
         FIGS.  11 A &amp;  11 B  illustrate how exterior (sidewall) and interior gaps between housing segments disposed along a sidewall of a device may be aligned symmetrically or asymmetrically; 
         FIG.  12    shows an isometric view of the first housing segment described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C,  4 ,  7 A,  7 B,  9 A , &amp;  9 C, with some of the non-conductive housing component(s) that abut, fill, and surround the interlock features and other interior surfaces of the first housing segment; 
         FIGS.  13 A- 13 D  show various details of a device forehead; 
         FIGS.  14 A- 14 G  show various details of a device chin; 
         FIGS.  15 A- 15 C  show example areas where the fifth and sixth housing segments described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C,  4 ,  5 A,  5 B,  6 A,  6 C,  7 A,  7 C,  8 A , &amp;  8 B may be structurally coupled to a support plate; 
         FIGS.  16 A- 16 D  illustrate various example ground connections between a support plate and a printed circuit board or logic board; 
         FIGS.  17 A &amp;  17 B  show flex circuits that may be coupled to various ones of the housing segments described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  5 A- 10 C,  13 A- 13 D,  14 A- 14 G , &amp;  15 A- 15 C; 
         FIG.  18    shows how the flex circuits described with reference to  FIGS.  17 A &amp;  17 B  may be placed and routed with respect to the housing segments and support plate described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  5 A- 10 C,  13 A- 13 D,  14 A- 14 G,  15 A- 15 C , &amp;  16 A- 16 D; 
         FIG.  19    shows a set of wireless frequency bands that may be used for wireless communication; 
         FIGS.  20 A &amp;  20 B  show corresponding ground springs and ground pads on a housing and a cover (e.g., a cover glass) mounted to the housing to enclose a device stack including a display; 
         FIGS.  21 A- 21 C  show various examples of low force springs and corresponding contact pads, as may be used to implement any of the ground springs and ground pads described with reference to  FIGS.  20 A,  20 B ; 
         FIG.  22    shows a cross-section of the device forehead shown in  FIG.  13 D ; and 
         FIG.  23    shows a sample electrical block diagram of an electronic device. 
     
    
    
     The use of cross-hatching or shading in the accompanying figures is generally provided to clarify the boundaries between adjacent elements and also to facilitate legibility of the figures. Accordingly, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, element proportions, element dimensions, commonalities of similarly illustrated elements, or any other characteristic, attribute, or property for any element illustrated in the accompanying figures. 
     Additionally, it should be understood that the proportions and dimensions (either relative or absolute) of the various features and elements (and collections and groupings thereof) and the boundaries, separations, and positional relationships presented therebetween, are provided in the accompanying figures merely to facilitate an understanding of the various embodiments described herein and, accordingly, may not necessarily be presented or illustrated to scale, and are not intended to indicate any preference or requirement for an illustrated embodiment to the exclusion of embodiments described with reference thereto. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following description is not intended to limit the embodiments to one preferred embodiment. To the contrary, it is intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the described embodiments as defined by the appended claims. 
     The embodiments described herein are directed to a multi-segment housing that may include multiple conductive segments. The conductive segments may define respective portions of a sidewall or exterior surface of the device. The multiple conductive segments may be structurally coupled by one or more non-conductive segments or “splits”. One or more of the conductive segments may be configured to operate as an antenna (i.e., one or more conductive segments may be configured to operate as one or more antennas). One or more of the non-conductive segments may provide electrical insulation between a conductive segment and adjacent conductive segments or components. 
     Some example embodiments are directed to a non-conductive segment that is structurally interlocked with one or more adjacent housing segments. In particular, a non-conductive housing segment or component may be molded into a gap between a pair of housing segments, and a portion of the non-conductive housing segment that is located or positioned internal to a housing may flow into and around various features to provide a structural interlock between the pair of housing segments. As described in more detail below, the non-conductive housing segment (or split) may be molded into one or more holes, openings, recesses, or cavities in interlock features that are formed near the ends of housing segments, internal to the housing. In some implementations, a non-conductive housing segment or component may at least partially fills the holes, openings, recesses, or cavities in interlock features formed near the adjacent ends of adjacent housing segments. 
     As described in more detail below, one or more of the housing segments may be formed from a conductive material and may be configured to function as an antenna for an electronic device. In particular, one or more housing segments may be operably coupled to wireless communication circuitry, and may be configured as an antenna to transmit and receive wireless communication signals. In some cases, separate housing segments may define the four main corners of a device or housing. Each separate housing segment may be configured to operate as an antenna in order to facilitate single-band or multi-band wireless communication. 
     These and other embodiments are described with reference to  FIGS.  1 A- 23   . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes only and should not be construed as limiting. 
     Directional terminology, such as “top”, “bottom”, “upper”, “lower”, “front”, “back”, “over”, “under”, “above”, “below”, “left”, “right”, etc. is used with reference to the orientation of some of the components in some of the figures described below. Because components in various embodiments can be positioned in a number of different orientations, directional terminology is used for purposes of illustration only and is in no way limiting. The directional terminology is intended to be construed broadly, and therefore should not be interpreted to preclude components being oriented in different ways. The use of alternative terminology, such as “or”, is intended to indicate different combinations of the alternative elements. For example, A or B is intended to include, A, or B, or A and B. 
       FIGS.  1 A- 1 C  show an example of an electronic device or simply “device”  100 . The device&#39;s dimensions and form factor, including the ratio of the length of its long sides to the length of its short sides, suggest that the device  100  is a mobile phone (e.g., a smartphone). However, the device&#39;s dimensions and form factor are arbitrarily chosen, and the device  100  could alternatively be any portable electronic device including, for example a mobile phone, tablet computer, portable computer, portable music player, health monitor device, portable terminal, or other portable or mobile device.  FIG.  1 A  shows a front isometric view of the device  100 ;  FIG.  1 B  shows a rear isometric view of the device  100 ; and  FIG.  1 C  shows a cross-section of the device  100 . The device  100  may include a housing  102  that at least partially surrounds a display  104 . The housing  102  may include or support a front cover  106   a  or a rear cover  106   b . The front cover  106   a  may be positioned over the display  104 , and may provide a window through which the display  104  may be viewed. In some embodiments, the display  104  may be attached to (or abut) the housing  102  and/or the cover  106   a.    
     As shown in  FIGS.  1 A &amp;  1 B , the housing  102  may define four corners  108  (e.g., corners  108   a ,  108   b ,  108   c , and  108   d ) that surround the display  104  and define portions of an exterior surface of the device  100 . In the current example, each of the four corners  108  of the housing  102  is positioned at a respective corner of a generally rectangular display  104 . However, the relative positions of the corners  108  may vary depending on the implementation. By way of example, the corners  108  are shown to be rounded in x/y dimensions defining the front and rear surfaces of the device  100  shown in  FIGS.  1 A &amp;  1 B , but may alternatively be squared or have other shapes. The housing  102  may have a generally rectangular shape having a length dimension that is greater than a width dimension. In some cases the length may be greater than 100 mm and the width may be greater than 50 mm. The housing  102  may also have a thickness that ranges between 5 mm and 15 mm. 
     In some cases, the housing  102  may be a multi-segment housing that includes multiple conductive or metal segments that are separated by one or more non-conductive segments. In some cases the multi-segment housing, may include a support plate  110  (see,  FIG.  1 C ) and/or additional internal structural components that are used to support internal electronic circuitry or electronic components. 
     The housing segments  112  of the housing  102  may form or define part or all of a sidewall  114 . In particular, the housing segments  112  may define portions of a side surface (e.g., portions of an exterior surface or exterior side surface) of the device  100 , which portions of the side surface may include four corners  108  of the sidewall  114 . As shown in  FIGS.  1 A &amp;  1 B , the housing segments  112  or sidewall  114  may at least partially surround a perimeter of the display  104 , and in some cases may be configured to protect the display  104  from drops of the device  100  that involve an impact to an edge or corner  108  of the sidewall  114 . By way of example, the housing  102  may include six housing segments  112  that are structurally coupled to other portions of the housing  102  by a set of one or more non-conductive segments or housing components  116 . 
     As used herein, the term “corner” may be used to refer to a portion of an exterior surface or sidewall of a device that forms a transition between adjoining sides or sidewalls. The term corner may refer to a region that includes 3-dimensional (3D) structure(s) that include portions of the sidewalls and/or portions of the front or rear covers  106   a ,  106   b  defining the front and rear surfaces, respectively. The term “corner” may also be used to refer to a portion of a sidewall  114  that extends (linearly or non-linearly) between the front and rear surfaces of a device and also joins adjacent sidewalls. In some embodiments, the corner portion of a sidewall may define a curved or arcuate contour between the front and rear surfaces. In some embodiments, the corner portion of a sidewall may define a flat side that joins the front and rear surfaces. As described herein, a generally rectangular device may be considered to have four corners that define the perimeters of the front and rear surfaces of the device with each corner connected to two adjacent corners. A generally rectangular device may also be considered to have four corners joined by four sides, with the four corners, in combination with the four sides, defining the perimeters of the front and rear surfaces of the device. 
     As explained in more detail herein, one or more of the housing segments  112  may be mechanically or structurally coupled to one or more adjacent housing segments  112  by the non-conductive housing segments or components  116 , which segments or components  116  may partially or completely fill gaps between the housing segments  112 . In some cases, the non-conductive housing segments or components  116  may also couple the housing segments  112  to the support plate  110  or another internal structure. A contiguous or monolithic piece of non-conductive material (e.g., a monolithic non-conductive component) may join or form all or multiple ones of the non-conductive housing segments or components  116  (or fill all or multiple ones of the gaps between housing segments  112 ), or different pieces of non-conductive material may join different sets of adjacent housing segments  112  (or fill different gaps between different pairs of adjacent housing segments  112 ). At least one non-conductive housing segment or component in the set of non-conductive housing segments or components  116  may define a portion (e.g., a segment) of an exterior surface of the sidewall  114  or housing  102 . In some alternative embodiments, the housing  102  may include more or fewer housing segments separated by more or fewer gaps filled by non-conductive housing segments or components  116 . In addition to mechanically coupling housing segments  112 , the non-conductive housing segment(s) or component(s) may electrically insulate housing segments  112 . 
     The housing segments  112  may have various lengths or shapes, and may be positioned symmetrically or asymmetrically about the device  100  or its sidewall  114 . By way of example, and with reference to  FIGS.  1 A &amp;  1 B , the device  100  is shown to have a first housing segment  112   a  defining at least part (or all) of a first corner  108   a  of the sidewall  114 . A second housing segment  112   b  defines at least part of a second corner  108   b  of the sidewall  114 , a third housing segment  112   c  defines at least part of a third corner  108   c  of the sidewall  114 , and a fourth housing segment  112   d  defines at least part of a fourth corner  108   d  of the sidewall  114 . In some embodiments, the second and third housing segments  112   b ,  112   c  may traverse greater lengths along the sidewall  114  than the first and fourth housing segments  112   a ,  112   d . A fifth housing segment  112   e  defines at least part of a first edge of the sidewall  114 , between the first housing segment  112   a  and the third housing segment  112   c , and a sixth housing segment  112   f  defines at least part of a second edge of the sidewall  114 , between the second housing segment  112   b  and the fourth housing segment  112   d . The third corner  108   c  forms a part of the housing  102  that is diagonally opposite the second corner  108   b , and the fourth corner  108   d  forms a part of the housing  102  that is diagonally opposite the first corner  108   a . The second edge forms part of the housing  102  that is opposite the first edge. The designations “first,” “second,” “third,” “fourth”, “fifth”, and “sixth” are arbitrary, and are used herein only for ease of explanation. 
     In this example, a different housing segment  112  forms each of the four corners  108 . However, the specific configuration of housing segments  112  may vary depending on the implementation. For example, a single housing segment may define two or more corners of a device, as described with reference to  FIG.  2 D , or substantially straight or non-corner housing segments may be positioned at the top and bottom edges of a device (e.g., similarly to the fifth and sixth housing segments  112   e ,  112   f  positioned at the side edges of the device  100 ). A housing may include more or fewer housing segments than the housing segments  112  shown in  FIGS.  1 A &amp;  1 B , and the housing segments may be distributed in various ways about a device&#39;s sidewall, as described with reference to  FIGS.  2 A- 2 E . 
     In some embodiments, one or more of the housing segments  112  may be a conductive segment formed from a metal or conductive material, and may be configured to operate as an antenna for the device  100 . Housing segments  112  that are configured to be operated as antennas may sometimes be referred to herein as conductive antenna segments. Wireless communication circuitry  118  within the device  100  may be electrically coupled to one or more of the conductive segments. For example, wireless communication circuitry  118  may be coupled to one or more (or each) of the housing segments  112  that is conductive and configured to operate as an antenna. When the housing segments  112   a ,  112   b ,  112 ,  112   d  defining the corners  108  of the device  100  are conductive segments, the wireless communication circuitry  118  may be operable to configure the conductive segments (as antennas) for wireless communication in one or more wireless frequency bands. Configuring the conductive segments for wireless communication may enable the device  100  to communicate with other devices in one or more wireless communication modes, such as a 4×4 multiple-input multiple-output (MIMO) wireless communication mode, or other wireless communication modes that use one or more antenna, and up to four antennas, simultaneously. The wireless communication circuitry  118  may include one or more radio frequency (RF) transmitters or receivers, one or more switches, one or more modems, and so on. 
     In general, the housing segments  112  may be formed from a metal material including, for example, steel, stainless steel, aluminum, titanium, and/or a metal alloy. In some embodiments, the housing segments  112  may be formed from a non-metal material and may be coated or covered by a metal or metallic coating or layer. The non-conductive housing segments or components  116  may be formed from a polymer material, composite, or other non-conductive material. Example polymers include, polycarbonate, acrylonitrile butadiene styrene (ABS), polyurethane, polyether ether ketone (PEEK), polybutylene terephthalate (PBT), polyamide, or other similar materials. 
     In some embodiments, the non-conductive housing segments or components  116  may be formed by a polymer material having a fiber fill, and the polymer material may structurally couple the housing segments  112  in addition to forming portions of an exterior surface of the sidewall  114  (e.g., portions of the sidewall  114  that bridge or fill exterior gaps between housing segments  112 ). In other embodiments, the non-conductive housing segments or components  116  may include a first portion formed from a first polymer material and a second portion formed from a second polymer material. The first polymer material may have a fiber fill and structurally couple the housing segments  112 . The second polymer material may be different from the first polymer material and form portions of an exterior surface of the sidewall  114 . Each polymer having a fiber fill may have a fiber fill including glass or other types of fibers. In some embodiments, the second polymer material may also have a fiber fill, but have a fiber fill that differs from the fiber fill of the first polymer material. 
     As shown in  FIGS.  1 A &amp;  1 B , the device  100  may include various other components. For example, the front of the device  100  may include one or more front-facing cameras  120 , speakers  122 , sensors  124 , microphones, or other components (e.g., audio, imaging, or sensing components) that are configured to transmit or receive signals to/from the device  100 . In some cases, a front-facing camera  120 , alone or in combination with other sensors, may be configured to operate as a bio-authentication or facial recognition sensor. The device  100  may also include various input devices, including a mechanical or virtual button  123 , which may be located along the front surface of the device  100 . The device  100  may also include buttons or other input devices positioned along the sidewall  114  and/or rear surface of the device  100 . By way of example, the rear surface of the device  100  is shown to include a rear-facing camera  126  or other optical sensor (see,  FIG.  1 B ). A flash or light source may also be positioned along the rear of the device  100  (e.g., near the camera  126 ). 
     As discussed previously, the device  100  may include a display  104  that is at least partially surrounded by the housing  102 . The display  104  may include one or more display elements including, for example, a light-emitting display (LED), organic light-emitting display (OLED), liquid crystal display (LCD), electroluminescent display (EL), or other type of display element. The display  104  may also include one or more touch and/or force sensors that are configured to detect a touch and/or a force applied to an external surface of the device  100 . The touch sensor may include a capacitive array of nodes or elements that are configured to detect a location of a touch along a surface of the cover  106 . The force sensor may include a capacitive array and/or strain sensor that is configured to detect an amount of force applied along the surface of the cover  106   a.    
       FIG.  1 C  depicts a cross-sectional view of the device  100  of  FIGS.  1 A and  1 B . As shown in  FIG.  1 C , the housing  102  may include one or more non-conductive housing segments or components  116  that structurally couple the housing segments  112 . The housing  102  may also include a front cover  106   a  and a rear cover  106   b , which may be structurally coupled to the non-conductive housing segments or components  116  and/or one or more of the housing segments  112 . In some cases, the rear cover  106   b  may be a discrete or separate component that is attached to the non-conductive housing segments or components  116  and/or one or more of the housing segments  112 . In other cases, the rear cover  106  may be integrally formed with one or more of the housing segments  112  or non-conductive housing segments or components  116  to form a component that defines both the rear surface of the device  100  as well as one or more portions of the sidewall  116  of the device  100 . 
     As shown in  FIG.  1 C , the sidewall  114  or housing  102  may define an interior volume  128  in which various electronic components of the device  100 , including the display  104 , may be positioned. In this example, the display  104  is at least partially positioned within the internal volume  128  and attached to an inner surface of the cover  106   a . A touch sensor, force sensor, or other sensing element may be integrated with the cover  106   a  and/or the display  104  and may be configured to detect a touch and/or force applied to an outer surface of the cover  106   a . In some cases, the touch sensor, force sensor, and/or other sensing element may be positioned between the cover  106   a  and the display  104 . 
     The touch sensor and/or force sensor may include an array of electrodes that are configured to detect a location and/or force of a touch using a capacitive, resistive, strain-based, or other sensing configuration. The touch sensor may include, for example, a set of capacitive touch sensing elements, a set of resistive touch sensing elements, or a set of ultrasonic touch sensing elements. When a user of the device touches the cover  106   a , the touch sensor (or touch sensing system) may detect one or more touches on the cover  106   a  and determine locations of the touches on the cover  106   a . The touches may include, for example, touches by a user&#39;s finger or stylus. A force sensor or force sensing system may include, for example, a set of capacitive force sensing elements, a set of resistive force sensing elements, or one or more pressure transducers. When a user of the device  100  presses on the cover  106   a  (e.g., applies a force to the cover  106   a ), the force sensing system may determine an amount of force applied to the cover  106   a . In some embodiments, the force sensor (or force sensing system) may be used alone or in combination with the touch sensor (or touch sensing system) to determine a location of an applied force, or an amount of force associated with each touch in a set of multiple contemporaneous touches. 
     As shown in  FIG.  1 C , a support plate  110  may be coupled to the non-conductive housing segments or components  116  and/or one or more of the housing segments  112  and may be used to attach or mount various other components of the device  100 . For example, wireless communication circuitry, a camera(s), a bio-authentication sensor(s), a processor, and other components may be attached to the support plate  110 . As examples, the support plate  110  may be metallic or plastic (or may be formed using any of the various materials that may be used to form the housing segments  112 ). In some cases, the various electronic components may be attached or integrated with one or more printed circuit boards (PCBs) or other logic boards that are attached to the support plate  110 . The processor may include a single processor or multiple processors, and may be configured to operate the touch sensing system, the force sensing system, the wireless communication circuitry, the camera(s), the bio-authentication sensor(s), or other components of the device  100 . A more detailed description of the various components of the device  100  is included below with respect to  FIG.  23   . 
     Turning to  FIGS.  2 A- 2 E , there are shown a number of different configurations  200  for a multi-segment housing that forms a sidewall of a device (e.g., a device such as the device  100  described with reference to  FIGS.  1 A- 1 C ). One or more conductive segments of the multi-segment housings may be configured to operate as antennas for the device. 
       FIG.  2 A  shows a first sidewall configuration  200   a  for a device (e.g., the device  100 ). The sidewall  114  may include six housing segments, which housing segments may be the housing segments  112  described with reference to  FIGS.  1 A- 1 C . Each of the housing segments  112  may be conductive or non-conductive. In some embodiments, at least one of the housing segments  112  positioned at a corner  108  of the sidewall  114  may be conductive and operated as an antenna for a device. In some embodiments, each of the housing segments  112  positioned at a corner  108  of the sidewall  114  may be conductive, and may be operated as an antenna for a device. The housing segments  112  positioned at the left and right edges of the sidewall  114  may also be conductive, and may be operated as separate antennas of a device, or as conductive antenna segments that may be electrically connected or disconnected to other conductive antenna segments of a device. 
     The housing segments  112  may include a first housing segment  112   a  defining at least part (or all) of a first corner  108   a  of the sidewall  114 , a second housing segment  112   b  defining at least part (or all) of a second corner  108   b  of the sidewall  114 , a third housing segment  112   c  defining at least part (or all) of a third corner  108   c  of the sidewall  114 , a fourth housing segment  112   d  defining at least part (or all) of a fourth corner  108   d  of the sidewall  114 , a fifth housing segment  112   e  defining an edge disposed between the first and third housing segments  112   a , and a sixth housing segment  112   f  defining an edge disposed between the second and fourth housing segments  112   b ,  112   d . The third corner  108   c  forms a part of the housing  102  that is diagonally opposite the second corner  108   b , and the fourth corner  108   d  forms a part of the housing  102  that is diagonally opposite the first corner  108   a . In some embodiments, and as shown, each of the second and third housing segments  112   b ,  112   c  may extend along a greater portion of the sidewall  114  than each of the first and fourth housing segments  112   a ,  112   d.    
     The first and fourth housing segments  112   a ,  112   d  may be substantially confined to the first and fourth corners  108   a ,  108   d  respectively, but in some embodiments (not shown) one or both of the first or fourth housing segments  112   a ,  112   d  may extend along one or more edges of the sidewall  114 . Alternatively, the first or fourth housing segment  112   a ,  112   d  may wrap around less than all of a corner  108   a  or  108   d  of the sidewall  114 . 
     The second and third housing segments  112   b ,  112   c  may wrap around the second and third corners  108   b ,  108   c  respectively, and may also extend along one or more edges of the sidewall  114 . For example, the second housing segment  112   b  may extend along a bottom edge of the sidewall  114  (given the orientation of the sidewall  114  shown in  FIG.  2 A ), and the third housing segment  112   c  may extend along a top edge of the sidewall  114 . Alternatively, the second or third housing segment  112   b ,  112   c  may wrap around less than all of a corner  108   b  or  108   c  of the sidewall  114  and extend along one or more side edges of the sidewall  114 . 
     Housing segments  112  that terminate in adjacent ends along the sidewall  114  may be structurally coupled to one another by a set of one or more non-conductive housing components  116  (e.g., non-conductive housing components,  116   a ,  116   b ,  116   c ,  116   d ,  116   e , and  116   f ) that partially or completely fill gaps between adjacent ends of housing segments  112  about the sidewall  114 . The sidewall  114  shown in  FIG.  2 A  has six such gaps. At least one non-conductive housing component  116  in the set of non-conductive housing components  116  may define a portion of an exterior surface of the sidewall  114  (and also an exterior surface of the housing  102  or device  100  that includes the sidewall  114 ). 
     In some embodiments, each of the housing segments  112   a ,  112   b ,  112   c ,  112   d  positioned at a corner  108   a ,  108   b ,  108   c ,  108   d  of the sidewall  114  may be operated as a different antenna, and in some cases the housing segments  112   a ,  112   b ,  112   c ,  112   d  may be operated as different antennas simultaneously. The housing segments  112  may also be operated as antennas individually or in pairs, as may be useful for different wireless communication modes. In some examples, the first and fourth housing segments  112   a ,  112   d  may be used to communicate, individually or in parallel, over a same wireless frequency band or bands (e.g., the mid and high wireless frequency bands described with reference to  FIG.  19   ), and the second and third housing segments  112   b ,  112   c  may be used to communicate, individually or in parallel, over a different set of one or more wireless frequency bands (e.g., the low, mid, and high wireless frequency bands described with reference to  FIG.  19   ). The use of housing segments positioned at diagonally opposite corners of the sidewall  114  as antennas that communicate over the same wireless frequency band(s) provides a relatively maximum spatial separation between the antennas, such that the antennas are less likely to couple to one another. 
     Optionally, the fifth housing segment  112   e  may be connected or disconnected to one of the corner housing segments (e.g., to the first housing segment  112   a  or the third housing segment  112   c ) by a circuit disposed interior to a housing including the sidewall  114 , or the sixth housing segment  112   f  may be connected or disconnected to one of the corner housing segments (e.g., to the second housing segment  112   b  or the fourth housing segment  112   d ) by a circuit disposed interior to the housing including the sidewall  114 . Such switchable connections enable the housing segments  112  defining the sidewall  114  to be tuned to communicate over different wireless frequency bands. 
       FIG.  2 B  shows another sidewall configuration  200   b  for a device (e.g., the device  100 ). The sidewall  202  may include six housing segments  204 . As an example, the housing segments  204  may include a first housing segment  204   a  defining at least part (or all) of a first corner  206   a  of the sidewall  202 , a second housing segment  204   b  defining at least part (or all) of a second corner  206   b  of the sidewall  202 , a third housing segment  204   c  defining at least part (or all) of a third corner  206   c  of the sidewall  202 , a fourth housing segment  204   d  defining at least part (or all) of a fourth corner  206   d  of the sidewall  202 , a fifth housing segment  204   e  defining an edge disposed between the first and third housing segments  204   a ,  204   c , and a sixth housing segment  204   f  defining an edge disposed between the second and fourth housing segments  204   b ,  204   d . The third corner  206   c  forms a part of the housing  202  that is diagonally opposite the second corner  206   b , and the fourth corner  206   d  forms a part of the housing  202  that is diagonally opposite the first corner  206   a.    
     Housing segments  204  that terminate in adjacent ends along the sidewall  202  may be structurally coupled to one another by a set of one or more non-conductive housing components  208  (e.g., non-conductive housing components,  208   a ,  208   b ,  208   c ,  208   d ,  208   e , and  208   f ) that partially or completely fill gaps between adjacent ends of housing segments  204  about the sidewall  202 . The sidewall  202  shown in  FIG.  2 B  has six such gaps. At least one non-conductive housing component  208  in the set of non-conductive housing components  208  may define a portion (e.g., a segment) of an exterior surface of the sidewall  202  (and also an exterior surface of the housing that includes the sidewall  202 ). In some embodiments, the non-conductive housing components  208  may be variously configured and positioned, or formed of various materials, as described with reference to  FIGS.  1 A- 1 C . 
     The sidewall  202  and housing segments  204  may be formed, structurally coupled, and electrically insulated similarly to the sidewall  114  and housing segments  112  described with reference to  FIG.  2 A . However, the gap between the third and fourth housing segments  112   c ,  112   d  in  FIG.  2 A  may be moved to the left along the top of the sidewall  202 , such that the third housing segment  204   c  may be substantially confined to the third corner  206   c , and the fourth housing segment  204   d  may wrap around the fourth corner  206   d  and extend along the top edge of the sidewall  202  (that is, along the top edge of the sidewall  202  given the orientation of the sidewall  202  shown in  FIG.  2 B ). In alternative embodiments (not shown), the third housing segment  204   c  may also extend along one or more side edges of the sidewall  202 , or may wrap around less than all of the third corner; or the fourth housing segment  204   d  may wrap around less than all of the fourth corner  206   d.    
     In some embodiments, each of the housing segments  204   a ,  204   b ,  204   c ,  204   d  positioned at a corner  206  of the sidewall  202  may be operated as a different antenna, and in some cases the housing segments  204   a ,  204   b ,  204   c ,  204   d  may be operated as different antennas simultaneously. The housing segments  204   a ,  204   b ,  204   c ,  204   d  may also be operated individually or in pairs, as may be useful for different wireless communication modes. In some examples, the first and third housing segments  204   a ,  204   c  may be used to communicate, individually or in parallel, over a same wireless frequency band or bands (e.g., the mid and high wireless frequency bands described with reference to  FIG.  19   ), and the second and fourth housing segments  204   b ,  204   c  may be used to communicate, individually or in parallel, over a different set of one or more wireless frequency bands (e.g., the low, mid, and high wireless frequency bands described with reference to  FIG.  19   ). 
     Optionally, the fifth housing segment  204   e  may be connected or disconnected to one of the corner housing segments (e.g., to the first housing segment  204   a  or the third housing segment  204   c ) by a circuit disposed interior to a housing including the sidewall  202 , or the sixth housing segment  204   f  may be connected or disconnected to one of the corner housing segments (e.g., to the second housing segment  204   b  or the fourth housing segment  204   d ) by a circuit disposed interior to the housing including the sidewall  202 . Such switchable connections enable the housing segments  204  defining the sidewall  202  to be tuned to communicate over different wireless frequency bands. 
       FIG.  2 C  shows another sidewall configuration  200   c  for a device (e.g., the device  100 ). The sidewall  210  includes six housing segments  214 . The sidewall  210  and housing segments  212  may be formed, structurally coupled, and electrically insulated similarly to the sidewall  114  and housing segments  112  described with reference to  FIG.  2 A . However, the manner in which the sidewall  210  is divided between the housing segments  212  differs, such that three housing segments  212   a ,  212   b ,  212   d  are positioned near the bottom edge of the sidewall  210  (given the orientation of the sidewall  210  shown in  FIG.  2 C ), and a single housing segment  212   c  is positioned near a top edge of the sidewall  210 . Alternatively, three housing segments may be positioned near the top edge of the sidewall  210 , and a single housing segment may be positioned near the bottom edge of the sidewall  210 . 
     The housing segments  212  may include a first housing segment  212   a  defining at least part (or all) of a first corner  214   a  of the sidewall  210 , a second housing segment  212   b  defining at least part (or all) of a second corner  214   b  of the sidewall  210 , a third housing segment  212   c  defining at least parts (or all) of third and fourth adjacent corners  214   c ,  214   d  of the sidewall  210  and a first edge of the sidewall  210  disposed between the third and fourth corners  214   c ,  214   d , a fourth housing segment  212   d  defining at least part of a second edge opposite the first edge, a fifth housing segment  212   e  defining an edge disposed between the first and third housing segments  212   a ,  212   c , and a sixth housing segment  212   f  defining an edge disposed between the second and third housing segments  212   b ,  212   c.    
     The first and second housing segments  212   a ,  212   b  may be substantially confined to the first and second corners  214   a ,  214   b  respectively, but in some embodiments (not shown) one or both of the first or second housing segments  212   a ,  212   b  may extend along one or more side edges of the sidewall  210 . Alternatively, the first or second housing segment  212   a ,  212   b  may wrap around less than all of a corner of the sidewall  210 . 
     Housing segments  212  that terminate in adjacent ends along the sidewall  210  may be structurally coupled to one another by a set of one or more non-conductive housing components  214  (e.g., non-conductive housing components,  216   a ,  216   b ,  216   c ,  216   d ,  216   e , and  216   f ) that partially or completely fill gaps between adjacent ends of housing segments  212  about the sidewall  210 . The sidewall  210  shown in  FIG.  2 C  has six such gaps. At least one non-conductive housing component  216  in the set of non-conductive housing components  216  may define a portion (e.g., a segment) of an exterior surface of the sidewall  210  (and also an exterior surface of the housing that includes the sidewall  210 ). In some embodiments, the non-conductive housing components  216  may be variously configured and positioned, or formed of various materials, as described with reference to  FIGS.  1 A- 1 C . 
     The sidewall  210  and housing segments  212  may be formed, structurally coupled, and electrically insulated similarly to the sidewall  202  and housing segments  204  described with reference to  FIG.  2 A . 
     In some embodiments, each of the first, second, third, and fourth housing segments  212   a ,  212   b ,  212   c ,  212   d  may be operated as a different antenna, and in some cases the housing segments  212   a ,  212   b ,  212   c ,  212   d  may be operated as different antennas simultaneously. The housing segments  212   a ,  212   b ,  212   c ,  212   d  may also be operated individually or in pairs, as may be useful for different wireless communication modes. In some examples, the first and second housing segments  212   a ,  212   b  may be used to communicate, individually or in parallel, over a same wireless frequency band or bands (e.g., the mid and high wireless frequency bands described with reference to  FIG.  19   ), and the third and fourth housing segments  212   c ,  212   d  may be used to communicate, individually or in parallel, over a different set of one or more wireless frequency bands (e.g., the low, mid, and high wireless frequency bands described with reference to  FIG.  19   ). 
     Optionally, the fifth housing segment  212   e  may be connected or disconnected to one of the corner housing segments (e.g., to the first housing segment  212   a  or the third housing segment  212   c ) by a circuit disposed interior to a housing including the sidewall  210 , or the sixth housing segment  212   f  may be connected or disconnected to one of the corner housing segments (e.g., to the second housing segment  212   b  or the third housing segment  212   c ) by a circuit disposed interior to the housing including the sidewall  210 . Such switchable connections enable the housing segments  212  defining the sidewall  210  to be tuned to communicate over different wireless frequency bands. 
       FIG.  2 D  shows a sidewall configuration  200   d  for a device (e.g., the device  100 ). The sidewall  218  includes five housing segments  220 . The housing segments  220  may include a first housing segment  220   a  defining at least part (or all) of a first corner  222   a  of the sidewall  218 , a second housing segment  220   b  defining at least part (or all) of a second corner  222   b  of the sidewall  218 , a third housing segment  220   c  defining at least parts (or all) of third and fourth adjacent corners  222   c ,  222   d  of the sidewall  218  and a first edge of the sidewall  218  disposed between the third and fourth corners  222   c ,  222   d , a fourth housing segment  220   d  defining an edge disposed between the first and third housing segments  220   a ,  220   c , and a fifth housing segment  220   e  defining an edge disposed between the second and third housing segments  220   b ,  220   c.    
     Housing segments  220  that terminate in adjacent ends along the sidewall  218  may be structurally coupled to one another by a set of one or more non-conductive housing components  224  (e.g., non-conductive housing components,  224   a ,  224   b ,  224   c ,  224   d , and  224   e ) that partially or completely fill gaps between adjacent ends of housing segments  220  about the sidewall  218 . The sidewall  218  shown in  FIG.  2 D  has five such gaps. At least one non-conductive housing component  224  in the set of non-conductive housing components  224  may define a portion (e.g., a segment) of an exterior surface of the sidewall  218  (and also an exterior surface of the housing that includes the sidewall  218 ). In some embodiments, the non-conductive housing components  224  may be variously configured and positioned, or formed of various materials, as described with reference to  FIGS.  1 A- 1 C . 
     The sidewall  218  and housing segments  220  may be formed, structurally coupled, and electrically insulated similarly to the sidewall  114  and housing segments  112  described with reference to  FIG.  2 A . However, the third and fourth housing segments  112   c ,  112   d  shown in  FIG.  2 A  are replaced with a singular housing segment  220   c  having a ground connection  226  where the gap between the third and fourth housing segments  112   c ,  112   d  is shown in  FIG.  2 A . The ground connection  226  provides separation between left and right portions of the housing segment  220   c  and enables the left and right portions to be operated as different antennas (e.g., similarly to the third and fourth segments  112   c ,  112   d  described with reference to  FIG.  2 A ). 
     In some embodiments of the sidewall  218 , a portion of the second housing segment  220   b  may be removed and filled with a non-conductive material  224   f  to provide an apparent symmetry between the lower left and lower right portions of the sidewall  218 . 
       FIG.  2 E  shows a sidewall configuration  200   e  for a device (e.g., the device  100 ). The sidewall  228  includes six housing segments  230 . The housing segments  230  may include a first housing segment  230   a  positioned near a first corner  232   a  of the sidewall  228 , a second housing segment  230   b  positioned near a second corner  232   b  of the sidewall  228 , a third housing segment  230   c  positioned near a third corner  232   s  of the sidewall  228 , a fourth housing segment  230   d  positioned near a fourth corner  232   d  of the sidewall  228 , a fifth housing segment  230   e  defining a first edge of the sidewall  228  and disposed between the first and third corners  232   a ,  232   c , and a sixth housing segment  230   f  defining a second edge of the sidewall  228  and disposed between the second and fourth corners  232   b ,  232   d.    
     Housing segments  230  that terminate in adjacent ends along the sidewall  228  may be structurally coupled to one another by a set of one or more non-conductive housing components  234  (e.g., non-conductive housing components,  234   a ,  234   b ,  234   c ,  234   d ,  234   e , and  234   f ) that partially or completely fill gaps between adjacent ends of housing segments  230  about the sidewall  228 . The sidewall  228  shown in  FIG.  2 E  has six such gaps. At least one non-conductive housing component  234  in the set of non-conductive housing components  234  may define a portion (e.g., a segment) of an exterior surface of the sidewall  228  (and also an exterior surface of the housing that includes the sidewall  228 ). In some embodiments, the non-conductive housing components  234  may be variously configured and positioned, or formed of various materials, as described with reference to  FIGS.  1 A- 1 C . 
     The sidewall  228  and housing segments  230  may be formed, structurally coupled, and electrically insulated similarly to the sidewall  114  and housing segments  112  described with reference to  FIG.  2 A . 
     In each of the sidewall configurations  200   a - e  described with reference to  FIGS.  2 A- 2 E , housing segments  112 ,  204 ,  212 ,  220 , or  230  that are configured to be operated as primary antennas for a device may be positioned at the corners or top and bottom edges of a device&#39;s sidewall  114 ,  202 ,  210 ,  218 , or  228 . Such a placement of antennas may be useful in that the antennas are positioned away from the sidewall edges that would normally be gripped by a user of a device that includes the sidewall. Housing segments  112 ,  204 ,  212 ,  220 , or  230  that are configured to be operated in pairs, in a same wireless frequency band, may be positioned at opposite corners or opposite extents of the sidewalls  114 ,  202 ,  210 ,  218 , or  228 . 
       FIGS.  3 A- 3 C  show example implementations of the first, second, third, and fourth housing segments  112   a ,  112   b ,  112   c , and  112   d  described with reference to  FIGS.  1 A- 1 C &amp;  2 A , and show example positions of the housing segments  112  with respect to a support plate  110 . The housing segments  112  and support plate  110  may be examples of the housing segments and support plate described with reference to  FIGS.  1 A- 1 C &amp;  2 A . 
     Each of the housing segments  112  shown defines a rounded corner  108  of a housing sidewall  114 . In alternative embodiments, the corners  108  may be squared corners, tapered corners of an octagon, or corners have other rounded or tapered shapes. 
     As shown primarily with reference to  FIG.  3 A , the first, second, third, and fourth housing segments  112   a ,  112   b ,  112   c ,  112   d  may not overlap the support plate  110 , and may be electrically insulated from the support plate  110 . A set of one or more non-conductive housing components (not shown in  FIG.  3 A  but shown in  FIG.  4   ) may form a structural bridge or bridges between the support plate  110  and the housing segments  112 , and in some cases may encapsulate portions of the support plate  110 . As examples, the non-conductive housing component(s) may adhere to the support plate  110  or be adhesively bonded to the support plate  110 . In some cases, the housing segments  112  may have interlock features that extend inward from the ends of the housing segments  112 , toward the support plate  110  or an interior volume defined at least in part by the housing segments  112 , as shown in later figures (e.g.,  FIGS.  5 A- 10 C ). The non-conductive housing component(s) may extend into, through, or around such interlock features, such that the non-conductive housing component(s) may better hold, grab or retain the housing segments  112 . Having a separation between the housing segments  112  and the support plate  110  can allow the housing segments  112  to resonate more freely when operated as antennas. The support plate  110  may be separated from some housing segments  112  (or some portions of housing segments  112 ) more than from other housing segments  112  (or other portions of housing segments  112 ). In alternative embodiments, the support plate  110  may extend under one or more of the housing segments  112  but be electrically insulated from the housing segments  112 , or the support plate  110  may be grounded to one or more of the housing segments  112  at selected points (e.g., at a ground connection, such as the ground connection described  226  with reference to  FIG.  2 D ). 
     In some embodiments, the housing segments  112   e ,  112   f  disposed along the long sides of the device  100  described with reference to  FIGS.  1 A- 1 C  may be conductive, and may be welded or otherwise structurally and electrically coupled to the left and right sides  306   a ,  306   b  (e.g., the long sides) of the support plate  110 . In other embodiments, the housing segments  112   e ,  112   f  may be conductive, and may be integrally formed as extensions of the support plate  110  (e.g., in a pan configuration). In still other embodiments, the housing segments  112   e ,  112   f  may be non-conductive, and may be formed as extensions of the non-conductive housing component that structurally couples the first, second, third, and fourth housing segments  112   a ,  112   b ,  112   c ,  112   d . In the latter embodiments, the support plate  110  may also be non-conductive, and may be part of a monolithic component that structurally couples the housing segments  112 . 
     As also shown in  FIG.  3 A , the support plate  110  may define portions (e.g., antenna portions) or entireties of one or more slot antenna features  302  (e.g., slot antenna features  302   a ,  302   b ,  302   c , and  302   d ). By way of example, a slot antenna feature  302  is shown near each of the four main corners  304  (e.g., corners  304   a ,  304   b ,  304   c , and  304   d ) of the support plate  110 . A fifth housing segment may be coupled to the left side  306   a  of the support plate  110  (i.e., the left edge as shown in  FIG.  3 A ) and define further portions (e.g., further antenna portions) of the slot antenna feature  302   a  or  302   c . Similarly, a sixth housing segment may be coupled to the right side  306   b  of the support plate  110  and define further portions (e.g., further antenna portions) of the right-side slot antenna feature  302   b  or  302   d . In some embodiments, the fifth housing segment may be electrically connected to, or disconnected from, the first or third housing segment  112   a  or  112   c , thereby adding the left-side slot antenna feature  302   a  or  302   c  to the first or third housing segment  112   a  or  112   c  and enabling an antenna including the first or third housing segment  112   a  or  112   c  to resonate in a different wireless frequency band. In some embodiments, the sixth housing segment may be electrically connected to, or disconnected from, the second or fourth housing segment  112   b  or  112   d , thereby adding the right-side slot antenna feature  302   b  or  302   d  to the second or fourth housing segment  112   b  or  112   d  and enabling an antenna including the second or fourth housing segment  112   b  or  112   d  to resonate in a different wireless frequency band, such as the B42 wireless frequency band. In some cases the fifth and sixth housing segments may be welded (e.g., spot welded or laser welded) to the support plate  110  along the left and right sides  306   a ,  306   b  of the support plate  110 . 
     In some embodiments, the support plate  110  or housing segments  112  may additionally or alternatively define all or portions of other antenna tuning features, 
       FIG.  3 A  further shows potential locations of antennas  324 ,  326  that may be housed within the interior volume defined by the housing segments  112 . In some embodiments, the interior antennas  324 ,  326  may be positioned at or near the corners defined by the first and third housing segments  112   a ,  112   c . In other embodiments, the interior antennas  324 ,  326  may be positioned elsewhere. In some embodiments, the interior antennas  324 ,  326  may be used in combination with antennas incorporating the second and fourth housing segments  112   b ,  112   d  to operate in the B42 wireless frequency band. The interior antennas  324 ,  326  may be positioned near the left side of the sidewall  114  to provide good separation (and decoupling) from the antennas incorporating the second and fourth housing segments  112   b ,  112   d.    
     In some embodiments, different portions  324   a ,  324   b  of the interior antenna  324  may be operated as different antennas to facilitate wireless communication in one or more wireless communication modes, in one or more wireless frequency bands. 
       FIGS.  3 B &amp;  3 C  show example locations of feed and ground connectors to the housing segments  112   a  and  112   b , which feed and ground connectors enable the housing segments  112   a ,  112   b  to be operated as antennas. The locations of feed and ground connectors described with reference to  FIGS.  3 B &amp;  3 C  can be replicated for the third and fourth housing segments  112   c ,  112   d , or feed and ground connectors for the third and fourth housing segments  112   c ,  112   d  may be located in alternate locations. 
     As shown in  FIG.  3 B , feed and ground connectors  308 ,  310  for the first housing segment  112   a  may be located interior to the sidewall  114 , on opposite sides of the first corner  108   a . In the embodiment shown, the feed connector  308  may be located more toward the apex of the first corner  108   a  than the leftmost end  312   a  of the first housing segment  112   a . The ground connector  310  may be located more toward the rightmost end  312   b  of the first housing segment  112   a . Alternatively, the locations of the feed connector  308  and ground connector  310  may be swapped, with the feed connector  308  being located more toward the rightmost end  312   b  of the first housing segment  112   a . The arrangement shown in  FIG.  3 B  may be advantageous in that the ground connector  310 , along with the gap between adjacent ends  312   b ,  314   a  of the first and second housing segments  112   a ,  112   b , helps define a demarcation point between the antennas provided by the first and second housing segments  112   a ,  112   b . The arrangement shown also enables a switchable coupling of the fifth housing segment and slot antenna feature  302   a  to the first housing segment  112   a , to extend the length of the resonate portion of an antenna including the first housing segment  112   a.    
     As also shown in  FIG.  3 B , feed and ground connectors  316 ,  318  for the second housing segment  112   b  may be located interior to the sidewall  114  near the second corner  108   b . In the embodiment shown, the ground connector  318  may be located closer to the rightmost end  314   b  of the second housing segment  112   b  than the feed connector  315 . Alternatively, the feed and ground connectors  316 ,  318  may be swapped, with the feed connector  316  being located more toward the rightmost end  314   b  of the second housing segment  112   b . The arrangement shown in  FIG.  3 B  enables a switchable coupling of the sixth housing segment and slot antenna feature  302   b  to the second housing segment  112   b , to extend the length of the resonate portion of an antenna including the second housing segment  112   b.    
     As shown, the resonate portion of the first housing segment  112   a  may resonate within frequencies of the mid and high bands described with reference to  FIG.  19   . The second housing segment  112   b  may have two resonate portions, with the leftmost resonate portion resonating within frequencies of the low and high wireless frequency bands described with reference to  FIG.  19   , and the rightmost resonant portion resonating within frequencies of the mid wireless frequency band described with reference to  FIG.  19   . The lengths of the arrows extending from the housing segments  112   a ,  112   b  represent the relative voltages along the housing segments  112   a ,  112   b . Longer length arrows indicate increased voltage and areas of better antenna efficiency in various wireless frequency bands. As shown, the portions of the first and second housing segments  112   a ,  112   b  with highest efficiency are at various ends of the housing segments  112   a ,  112   b . To achieve maximum possible efficiencies, it is therefore desirable to electrically insulate these ends (e.g., ends  312   a ,  312   b ,  314   a , and  314   b ) from surrounding conductors, and to decouple (e.g., lower the capacitance of) these ends  312   a ,  312   b ,  314   a ,  314   b  with respect to surrounding conductors. 
     The antenna configuration described with reference to  FIG.  3 B  provides good separation between the portions of the first and second housing segments  112   a ,  112   b  that resonate within the mid wireless frequency band.  FIG.  3 C  shows alternative locations of feed and ground connectors  320 ,  322  for the second housing segment  112   b . The alternative feed and ground connectors  320 ,  322  are located approximately in the middle of the lower edge of the sidewall  114  (and in some cases, somewhat closer to the first corner  108   a , as shown). The feed connector  320  may be located closer to the second corner  108   b , and the ground connector  322  may be located closer to the first corner  108   a . This alternative configuration for feed and ground connectors  320 ,  322  of the second housing segment  112   b  may provide good or better low and high wireless frequency band efficiency, but may increase the likelihood of coupling between the portions of the housing segments  112   a ,  112   b  that resonate in the mid wireless frequency band, absent good electrical insulation between the adjacent ends  312   b ,  314   a  of the first and second housing segments  112   a ,  112   b . In some embodiments, wireless communication circuitry may switchably connect the second housing segment  112   b  to the feed and ground connectors  316 ,  318  described with reference to  FIG.  3 B , or to the feed and ground connectors  320 ,  322  described with reference to  FIG.  3 C . One or the other set of connectors may be used as necessary in response to particular trigger conditions to improve antenna efficiency or other parameters. 
       FIG.  4    shows each of the first, second, third, fourth, fifth, and sixth housing segments  112   a ,  112   b ,  112   c ,  112   d ,  112   e , and  112   f  described with reference to  FIGS.  1 A- 1 C,  2 A , &amp;  3 A- 3 C in relation to the support plate  110  described with reference to  FIGS.  1 C &amp;  3 A- 3 C .  FIG.  4    also shows an example non-conductive housing component including a portion  400  that structurally couples the housing segments  112  to each other and/or the support plate  110 . By way of example, the non-conductive housing component may include a first portion  400  (e.g., a fiber-filled polymer material) that structurally couples the housing segments  112  to each other and the support plate  110 , and second portions  116  (e.g., a polymer material without fiber fill), that fills the outer portions of gaps between the housing segments  112  and forms portions of a smooth exterior surface of the sidewall  114 . In some embodiments, the first portion  400  may at least partially encapsulate portions of the support plate  110 . The second portions  116  of the non-conductive housing component may be color-matched (or not color-matched) to the exterior surfaces of the housing segments  112 . Alternatively, the non-conductive housing component may include a single portion that both structurally couples the housing segments  112  to each other and the support plate  110 , and forms portions of the exterior surface of the sidewall  114 . 
       FIG.  4    also shows a camera brace  402  that is structurally coupled to the upper right corner of the support plate  110 . When the support plate  110  and camera brace  402  are metallic, the camera brace  402  may be welded to the support plate  110  for strength and to provide an electrical coupling between the support plate  110  and camera brace  402 . The electrical coupling may enable the support plate  110  and camera brace  402  to be coupled to a common ground, which may improve the performance of the housing segments  112  when the housing segments  112  are operated as antennas. The camera brace  402  may provide a housing for one or more camera modules, such as one or more rear-facing camera modules (i.e., cameras with a field of view extending from the rear or non-display side of a device). 
     Turning now to  FIGS.  5 A- 10 C , there are shown several interior views of example implementations of the housing segments  112  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . The various views show example details of interlock features defined by the housing segments  112 . In particular, the various views show example details of the interlock features that extend from adjacent ends of respective adjacent housing segments  112  around the sidewall  114  (e.g., details of the interlock features that extend from adjacent ends of respective adjacent conductive housing segments, which adjacent conductive housing segments are separated by a non-conductive housing component). As shown in the figures, the interlock features may extend into an interior volume of a device. The “A” views in  FIGS.  5 A- 10 C  provide isometric views of the interlock features that extend from adjacent ends of adjacent housing segments  112 . The “B” and “C” views illustrate respective cross-sections of the two different interlock features shown in the corresponding “A” view, with various holes in the interlock features filled by a non-conductive housing component that structurally couples the two adjacent housing segments  112  shown in the “A” view. The various housing segments  112 , interlock features, sub-features thereof, and techniques for forming the housing segments  112 , interlock features, and sub-features thereof, as described in  FIGS.  5 A- 10 C , may be applied to join various of the housing segments described with reference to  FIGS.  1 A- 4   , as will be understood by a person of ordinary skill in the art after reading this disclosure. 
       FIGS.  5 A- 5 C  show examples of interlock features  500 ,  502  that extend into an interior volume  544  defined at least partly by the sidewall  114 . The interlock features  500 ,  502  may extend inward, into the interior volume  544 , from adjacent ends of the fifth and third housing segments  112   e ,  112   c  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the fifth housing segment  112   e  is shown on the left, and a portion of the third housing segment  112   c  is shown on the right. As previously described, the fifth and third housing segments  112   e ,  112   c  may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. In some embodiments, each of the gaps defined between adjacent ends of adjacent housing segments  112  about the sidewall  114  may have the same dimensions. In other embodiments, the gaps may have different dimensions. To provide good structural rigidity, the gaps may have a relatively small width about the sidewall  114 . However, when the housing segments  112  are configured to be operated as antennas, and where possible, it may be desirable to increase the widths of the gaps interior to an exterior surface of the sidewall  114 . The increased separation may decrease the capacitance between adjacent housing segments  112  and reduce the likelihood that the adjacent housing segments  112  couple to one another and interfere with the resonance of, or decrease the efficiency of, the housing segments  112  (e.g., when the housing segments  112  are operated as antennas). 
     A first interlock feature  500  may include a first protrusion  540  that extends inward from an end of the fifth housing segment  112   e , into the interior volume  544 . A second interlock feature  502  may include a second protrusion  542  that extends inward from an end of the third housing segment  112   b , into the interior volume  544 . The first interlock feature  500  feature may be located near a button that protrudes through a cavity  504  in the fifth housing segment  112   e  and is operable from the exterior of a device including the fifth and third housing segments  112   e ,  112   c . Because of the button, the first interlock feature  500  may be somewhat thinner than the second interlock feature  502 . 
     As shown, the interlock features  500 ,  502  and their protrusions  540 ,  542  may be integrally defined by (e.g., molded with or machined into) the fifth and third housing segments  112   e ,  112   c  respectively. Alternatively, the interlock features  500 ,  502  and their protrusions  540 ,  542  may be structurally coupled to the fifth and third housing segments  112   e ,  112   c  in other ways, such as by welds or fasteners. Each of the interlock features  500 ,  502  and protrusions  540 ,  542  may be set slightly back from a gap along the sidewall (i.e., an exterior or sidewall gap  506 ) to form an interior gap  508  between the housing segments  112   e ,  112   c  that has a greater width than the exterior gap  506 . For example, a first end surface  546  of the fifth housing segment  112   e  may be positioned opposite a second end surface  548  of the third housing segment  112   c  to define the exterior gap  506 . The first interlock feature  500  may have a first interlock surface  550  positioned opposite a second interlock surface  552  of the second interlock feature  502  to define the interior gap  508 . The first interlock surface  550  may be defined by the first protrusion  540 , and the second interlock surface  552  may be defined by the second protrusion  542 . The exterior gap  506  may have a first gap width, and the interior gap  508  may have a second gap width. In some embodiments, and as shown in  FIG.  5 A , the second gap width may be greater than the first gap width. By way of example, the entirety of the second interlock feature  502  may be set back from the exterior gap  506  by an offset  510   b , whereas an outermost portion of the first interlock feature  500  may be set back from the exterior gap  506  by an offset  510   a , and an innermost portion of the first interlock feature  500  may widen into the interior gap  508  (e.g., part of the first interlock feature  500  may overlap the offset  510   a ). This widening can increase the structural rigidity of the first interlock feature  500  given its overall narrow width, and/or can provide material for forming a boss protrusion  512  (e.g., a screw boss). 
     A number of through holes or blind holes (also referred to as openings or recesses at times herein) may be formed in each of the interlock features  500 ,  502  to enable a non-conductive housing component to extend into, through, or around the interlock features  500 ,  502  (thereby increasing the strength of the structural coupling between the fifth housing segment  112   e , the non-conductive housing component, and the third housing segment  112   c ). With reference to  FIGS.  5 A &amp;  5 B , a first hole  514  (e.g., a blind hole) may extend into the first interlock surface  550  of the first interlock feature  500 . In some embodiments, the first hole  514  may be end-milled or drilled into the first interlock surface  550 . In some embodiments, the first hole  514  may be a blind hole so that a metal wall extends from the exterior surface of the sidewall  114  to the innermost point of the first interlock feature  500  (i.e., to the innermost point of the first interlock feature  500  with respect to the interior volume  544 ). Making the first hole  514  a blind hole can maintain separation between the first hole  514  and the button cavity  504 , which in some cases may be open to the exterior of a device. This can enable the button cavity  504  to be sealed separately from the first hole  514  and tends to decrease the likelihood that moisture or contaminants will enter into the gap between the fifth and third housing segments  112   e ,  112   c  via the cavity  504 . 
     In some embodiments, the first hole  514  may have a portion with a shape or contour that corresponds to a shape or contour of the exterior surface of the sidewall  114 , thereby defining a wall or wall portion between the first hole  514  and the exterior surface of the sidewall  114  that has a substantially uniform thickness (see  FIG.  5 C ). This can enable more non-conductive material to extend into the first interlock feature  500  while maintaining the structural rigidity of the sidewall  114 . In some embodiments, all portions of the wall surrounding the first hole  514  may have a substantially uniform thickness. When the exterior surface of the sidewall  114  has a curved contour, the first hole  514  may in some cases be kidney-shaped. 
     The first hole  514  may be end-milled so that it has a smooth wall. This can be important when a device is dropped, in that a drop of a device can cause sharp features to function as knives or chisels that tend to crack non-conductive housing components such as the non-conductive housing component that extends into the first interlock feature  500 . Interlock features that are thinner (such as the first interlock feature  500 ) may be more susceptible to such cracking. In alternative embodiments, the first hole  514  may be drilled, or may not be kidney-shaped, or may be a through hole. 
     With further reference to  FIG.  5 A , a second hole  554  may extend into an upper surface  530  of the first interlock feature  500  or first protrusion  540 . In some embodiments, the second hole  554  may be end-milled or drilled into the upper surface  530 . The second hole  554  may be transverse to the first hole  514  and intersect the first hole  514  (i.e., the second hole  554  may be a transverse hole with respect to the first hole  514 ). The non-conductive housing component that structurally couples the fifth and third housing segments  112   e ,  112   c  may be insert molded into the first and second holes  514 ,  554 , and in some cases may enter one of the holes and exit the other of the holes, thereby extending into the first interlock feature  500  in at least two orthogonal directions. 
     A boss protrusion  512  (e.g., a screw boss) for mounting a button assembly to the fifth housing segment  112   e  may be integrated with (e.g., molded or machined into) the first interlock feature  500  or first protrusion  540 . However, the boss protrusion  512  may require extending the extent of the first interlock feature  500  into the gap  508  between the fifth and third housing segments  112   e ,  112   c  (e.g., the boss protrusion  512  may be offset from the first interlock surface  550  toward the first end surface  546 ). A threaded hole  516  may be tapped into or defined by the boss protrusion  512  as a blind hole, thereby increasing the structural rigidity of the first interlock feature  500  and boss protrusion  512  and enabling a separation of moisture sealing issues pertaining to the threaded hole  516  and other holes formed in the first interlock feature  500 . Alternatively, the threaded hole  516  may be a through hole. 
     In addition to the first and second holes  514 ,  554 , additional holes  518 ,  520 ,  558 ,  560  may be formed in the first interlock feature  500  or first protrusion  540 , as shown in  FIGS.  5 A &amp;  5 B . The additional holes  518 ,  520 ,  558 ,  560  may provide additional surface area for the non-conductive housing component to hold or grab onto, retain, or conform to, thereby improving the strength of the structural coupling between the fifth and third housing segments  112   e ,  112   c . In some embodiments, the additional holes  518 ,  520 ,  558 ,  560  may be drilled. In some embodiments, some of the additional holes  518 ,  520 ,  558 ,  560  may be blind holes and/or intersect. For example, the holes  518  and  558  may intersect, and the holes  520  and  560  may intersect. The intersecting holes may provide paths through which the material(s) of the non-conductive housing component may be molded. Forming the holes  518  and  520  as blind holes again enables a separation of moisture sealing issues, and may increase the structural rigidity of the first interlock feature  500 . In alternative embodiments, one or more of the additional holes  518 ,  520 ,  558 ,  560  may be a through hole. 
     With reference to  FIGS.  5 A &amp;  5 C , a first hole  522  (e.g., a round through hole) may extend into the second interlock surface  552  of the second interlock feature  502 . In some embodiments, the first hole  522  may be drilled or otherwise cut into the second interlock feature  502 . The first hole  522  may be opposite to or substantially aligned with the first hole  514  in the first interlock feature  500  or protrusion  540 . As defined herein substantially aligned holes or components are disposed along a common axis and may be fully aligned or partly aligned. In some embodiments, partly aligned holes or components may have cross-sections that overlap by at least 25%, or 50%, or even 75%. A second hole  524  (e.g., a round hole) may extend into an upper surface  562  of the second interlock feature  502  or second protrusion  542 , and may be drilled into or otherwise cut into the upper surface  562 . The second hole  524  may be transverse to the first hole  522  (e.g., the second hole  524  may be a first transverse hole that intersects the first hole  522  (e.g., perpendicularly)). A third hole  526  (e.g., a round hole) may extend into a lower surface  564  of the second interlock feature  502  or second protrusion  542  (see  FIG.  5 C ), and may be drilled or otherwise cut into the lower surface  564 . The third hole  526  may also be transverse to the first hole  522  (e.g., the third hole  526  may be a second transverse hole that intersects the first hole  522  (e.g., perpendicularly)). The second and third holes  524 ,  526  may have the same diameter or different diameters, and in some cases may be formed as a single through hole. In contrast to the first interlock feature  500 , which extends into the interior gap  508 , the second interlock feature  502  may not extend past the second interlock surface  552 . 
     As shown in  FIGS.  5 B &amp;  5 C , a non-conductive housing component  528  may at least partially fill the first, second, and other holes formed in the first and second interlock features  500 ,  502 , thereby structurally coupling the fifth housing segment  112   e  and the third housing segment  112   c . In some cases, the non-conductive component  528  may at least partially fill each of the first, second, and additional holes  514 ,  554 ,  518 ,  520 ,  558 ,  560  in the first interlock feature  500 , and the first, second, and third holes  522 ,  524 ,  526  in the second interlock feature  502 . The non-conductive housing component  528  may not extend over the upper surface  530  of the first interlock feature  500 , but may extend over the upper surface  532  of the second interlock feature  502 . Surrounding as many surfaces of the interlock features  500 ,  502  as possible with the material(s) of the non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  500 ,  502  and the non-conductive housing component  528 . In some embodiments, a shelf or shelves may be cut into the upper surfaces of the fifth and third housing segments  112   e ,  112   c  or first and second interlock features  500 ,  502 . For example, a shelf  556  may be cute into the upper surface  532  of the second interlock feature. The shelves, including the shelf  556  may serve various purposes. For example, the shelves may reduce the capacitive coupling between a housing component  112  and another component, or the shelves may increase the surface area over which the non-conductive component  528  may adhere to a housing segment  112 . In some embodiments, holes may be formed in an upper surface or shelf of a housing segment  112  to enable the non-conductive component  528  to extend into and through portions of a housing segment  112  away from an interlock feature. For example, holes  562 ,  566  may be cut into the shelf  556 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  500 ,  502  or housing segments  112   e ,  112   c , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIG.  5 C , where the non-conductive housing component  528  extends over the upper surface  532  of the second interlock feature  502 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  500 ,  502  or housing segments  112   e ,  112   c  by an adhesive  534  (see  FIGS.  5 B &amp;  5 C ). A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   e ,  112   c  and extending along the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   e ,  112   c  and rear cover  106   b.    
     In some embodiments, the non-conductive housing component  528  may be formed by a polymer material having a fiber fill, and the polymer material may at least partially fill various holes in the first and second interlock features in addition to forming an exterior surface of the sidewall  114  (e.g., a portion of the sidewall  114  that bridges or fills the exterior gap  506 ). In other embodiments, the non-conductive housing component  528  may include a first portion formed from a first polymer material and a second portion formed from a second polymer material. The first polymer material may have a fiber fill and at least partially fill various holes in the first and second interlock features. The second polymer material may be different from the first polymer material and form an exterior surface of the sidewall  114  (e.g., a portion of the sidewall  114  that bridges or fills the exterior gap  506 ). Each polymer having a fiber fill may have a fiber fill including glass or other types of fibers. In some embodiments, the second polymer material may also have a fiber fill, but have a fiber fill that differs from the fiber fill of the first polymer material. 
     The structures of the first and second interlock features  500 ,  502 , and more generally all of the interlock features described herein, may be configured to reduce strain on the housing segments  112  and non-conductive housing component in bending modes induced by a device drop. 
       FIGS.  6 A- 6 C  show examples of the interlock features  600 ,  602  that extend into an interior volume  634  defined at least partly by the sidewall  114 . The interlock features  600 ,  602  may extend inward, into the interior volume  634 , from adjacent ends of the fourth and sixth housing segments  112   d ,  112   f  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the fourth housing segment  112   d  is shown on the left, and a portion of the sixth housing segment  112   f  is shown on the right. As previously described, the fourth and sixth housing segments  112   d ,  112   f  may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. The non-conductive housing component may be part of the same non-conductive housing component that structurally couples the housing segments  112  described with reference to  FIGS.  5 A- 5 C , or a different non-conductive housing component. 
     A first interlock feature  600  may include a first protrusion  636  that extends inward from an end of the fourth housing segment  112   d , into the interior volume  634 . A second interlock feature  602  may include a second protrusion  638  that extends inward from an end of the sixth housing segment  112   f , into the interior volume  634 . Each of the first and second interlock features  600 ,  602  may be located between the camera brace  402  described with reference to  FIG.  4    and the sidewall  114  formed by the fourth and sixth housing segments  112   d ,  112   f . Because of the camera brace  402  (or other components), the first and second interlock features  600 ,  602  may be somewhat shallower than other interlock features (i.e., they may extend inward from the sidewall  114  to a lesser extent). 
     As shown, the interlock features  600 ,  602  and their protrusions  636 ,  638  may be integrally defined by (e.g., molded with or machined into) the fourth and sixth housing segments  112   d ,  112   f  respectively. Alternatively, the interlock features  600 ,  602  and their protrusions  636 ,  638  may be structurally coupled to the fourth and sixth housing segments  112   d ,  112   f  in other ways, such as by welds or fasteners. Each of the interlock features  600 ,  602  and protrusions  636 ,  638  may be set slightly back from a gap along the sidewall  114  (i.e., an exterior or sidewall gap  606 ) to form an interior gap  608  between the housing segments  112   d ,  112   f  that has a greater width than the exterior gap  606 . For example, a first end surface  640  of the fourth housing segment  112   d  may be positioned opposite a second end surface  642  of the sixth housing segment  112   f  to define the exterior gap  606 . The first interlock feature  600  may have a first interlock surface  644  positioned opposite a second interlock surface  646  of the second interlock feature  602  to define the interior gap  608 . The first interlock surface  644  may be defined by the first protrusion  636 , and the second interlock surface  646  may be defined by the second protrusion  638 . The exterior gap  606  may have a first gap width, and the interior gap  608  may have a second gap width. In some embodiments, and as shown in  FIG.  6 A , the second gap width may be greater than the first gap width. By way of example, the first interlock feature  600  may be set back from the exterior gap  606  by a first offset, and the second interlock feature  602  may be set back from the exterior gap  606  by a second offset. 
     A number of holes may be formed in each of the interlock features  600 ,  602  to enable a non-conductive housing component to extend into, through, or around the interlock features  600 ,  602  (thereby increasing the strength of the structural coupling between the fourth housing segment  112   d , the non-conductive housing component, and the sixth housing segment  112   f ). With reference to  FIGS.  6 A &amp;  6 B , a first hole  610  (e.g., a blind hole) may extend into the first interlock surface  644  of the first interlock feature  600 . In some embodiments, the first hole  610  may be formed by a set of multiple partially overlapping drill holes. Drilling multiple partially overlapping holes may save cost over forming the first hole  610  using an end mill. In some embodiments, the partially overlapping holes may be drilled close enough to reduce the ridges where holes overlap and thereby reduce the tendency of the ridges to operate as knives or chisels when a device is dropped. In alternative embodiments, the first hole  610  may be formed by an end mill or other means. The first hole  610  may have an out-of-round shape that enables it to have a greater diameter perpendicular to the front (display) and rear surfaces of a device while having a smaller diameter extending transverse to the sidewall  114 . The importance of a smooth wall, as discussed with reference to the first hole  514  shown in  FIGS.  5 A &amp;  5 B , may be less important given the increased width of the first interlock feature  600  shown in  FIGS.  6 A &amp;  6 B . 
     Additional holes  612 ,  614  may also be formed in the first interlock feature  600  or protrusion  636 . The additional holes  612 ,  614  may be transverse to the first hole  610 , and in some cases, first, second, and third intersecting holes  610 ,  612 , and  614  may be oriented along respective x, y, and z axes. This may enable a non-conductive housing component to extend into and through the first interlock feature  600  along three axes, which can strengthen the structural coupling between the non-conductive housing component and the first interlock feature  600 . The second hole  612  may extend into an interior surface  648  of the first interlock feature  600  or protrusion  636 , and may be a blind hole given that it extends toward the sidewall  114 . The third hole  614  may extend into an upper surface  650  of the first interlock feature  600  or protrusion  636 , and may be a through hole extending perpendicular to the front and rear surfaces of a device. As shown, the first interlock surface  644 , interior surface  648 , and upper surface  650  may be orthogonal surfaces. 
     A boss protrusion  616  (e.g., a screw boss), which in some cases may serve as an antenna feed connector to which a flex circuit may be coupled, may be machined into or structurally coupled to the fourth antenna segment  112   d  adjacent the first interlock feature  600 . The boss protrusion  616  may be tapped with or otherwise define a threaded hole  618  that extends perpendicular to the front and rear surfaces of a device. In some embodiments, the boss protrusion  616 , or boss protrusion  616  in combination with the threaded hole  618 , may be formed using a hole cutter (e.g., a computer numerical control (CNC) hole cutter). The hole cutter may form the boss protrusion  616 , as well as a trough, lip, or ledge  620  surrounding and recessed from an upper surface of the boss protrusion  616 . The ledge  620  may enable non-conducive material(s) such as those of the non-conductive housing component that is used to structurally couple the first and second interlock features  600 ,  602 , and/or a polyurethane applied as a seal between plastic and metal portions of the housing that includes the first and second interlock features  600 ,  602  and non-conductive housing component, to be applied around the boss protrusion  616  without extending over an upper surface of the boss protrusion  616 . Stated differently, the ledge  620  enables non-conductive material(s) to be disposed around the boss protrusion  616  without compromising good electrical contact between a flex circuit or other element and the boss protrusion  616 . In some cases, a non-conductive material may be applied around the boss protrusion  616 , and then an upper portion of the boss protrusion  616  may be removed, or the upper surface of the boss protrusion  616  may be planed, to ensure that the upper surface of the boss protrusion  616  is free of any non-conductive material. 
     With reference to  FIGS.  6 A &amp;  6 C , a first hole  622  may extend into the second interlock surface  646  of the second interlock feature  602 . The first hole  622  may be drilled or otherwise cut into the second interlock feature  602 . The first hole  622  may be a conical hole (e.g., a hole formed using a conical drill bit). A conical drill bit enables the size of the hole  622  to have a larger diameter toward the second interlock surface  646 , but a smaller diameter where the hole extends behind a boss protrusion  624 . Similarly to how the first hole  610  in the first interlock feature  600  is formed, the first hole  622  in the second interlock feature  602  may be formed by drilling multiple partially overlapping holes with the conical drill bit. Alternatively, the first hole  622  may be formed by drilling a single conical hole, or multiple holes using a uniform diameter drill bit, or multiple holes using different drill bits (e.g., a conical drill bit in combination with a uniform diameter drill bit, or a set of drill bits having different uniform diameters). In some embodiments, the partially overlapping holes may be drilled close enough to reduce the ridges where holes overlap, thereby reducing the tendency of the ridges to operate as knives or chisels when a device is dropped. The first hole  622  may be a through hole, as shown, or a blind hole. A second hole  626  (e.g., a round hole) may extend into an inner surface  652  of the second interlock feature  602  or protrusion  638 . The second hole  626  may be drilled or otherwise cut into the second interlock feature  602 , and may be transverse to the first hole  622  (e.g., the second hole  626  may be a transverse hole that intersects the first hole  622  (e.g., perpendicularly)). 
     A boss protrusion  624 , which in some cases may serve as a flex circuit connection point, may be machined in or structurally coupled to the sixth antenna segment  112   f , and may be integrated with the second interlock feature  602  or protrusion  638 . The boss protrusion  624  may have a surface that is angled (e.g., at a 30 degree angle, ±10%) with respect to an imaginary line extending perpendicular to the front and rear surfaces of a device. In alternative embodiments, the surface may be angled between 25 and 35 degrees, between 20 and 40 degrees, or between 0 and 90 degrees. The boss protrusion  624  may be angled so that a screw may be threaded into a threaded hole  628  within the boss protrusion  624  after the sixth housing segment  112   f  has been attached to a support plate  220  adjacent a camera brace  402 , or so that the threaded hole  628  may be tapped after the sixth housing segment  112   f  is structurally coupled to the support plate  110  adjacent the camera brace  402 . Examples of the support plate  110  and camera brace  402  are described with reference to  FIG.  4   . The boss protrusion  624  may also be angled to reduce the inward extension of the second interlock feature  602  or protrusion  638  from the sidewall  114 , while also maintaining an upper surface  630  (of the second interlock feature  602 ) to which a device cover or other element may be mated or sealed. The angle of the angled surface of the boss protrusion  624  may be selected to balance inward extension of the second interlock feature  602  or protrusion  638  (or inward extension of the boss protrusion  624 ) and the area of the sealing surface  630 . The boss protrusion  624  may be formed similarly to the boss protrusion  616  formed in the first interlock feature  600 , but in some cases may have or define a threaded hole  628  with a shallower thread depth, so that the threaded hole  628  does not intersect the first hole  622  formed in the second interlock feature  602 . 
     The second interlock feature  602  may form part of (or abut) an antenna tuning feature (e.g., a slot antenna feature  632  formed between the sixth housing segment  112   f  and a support plate to which the fourth and sixth housing segments  112   d ,  112   f  are structurally coupled). In some embodiments, the antenna tuning feature may be defined by a variable thickness of the sixth housing segment  112   f  along the sidewall  114 . For example, the slot antenna feature  632  may extend from the second interlock feature  602  along the sixth housing segment  112   f , and may be defined by a thinned portion of the sixth housing segment  112   f . The wider portions of the sixth housing segment  112   f , adjacent each end of the thinned portion, may taper into the thinned portion (e.g., with an arc or other profile), as shown, or there may be an abrupt transition (e.g., a step) from each wider portion to the thinned portion. 
     As shown in  FIGS.  6 B &amp;  6 C , a non-conductive housing component  528  may at least partially fill or extend into the first and second interlock features  600 ,  602 . Surrounding as many surfaces of the interlock features  600 ,  602  as possible with the non-conductive material(s) of a non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  600 ,  602  and the non-conductive housing component  528 . In some embodiments, the non-conductive housing component  528  may extend into holes  610 ,  612 ,  614 ,  622 , and  626 . 
     In some embodiments, a shelf or shelves may be cut into the upper surfaces of the fourth and sixth housing segments  112   d ,  112   f  or first and second interlock features  600 ,  602 . For example, a shelf  654  may be cut into the upper surface  650  of the first interlock feature  600 . In some embodiments, holes may be formed in an upper surface or shelf of a housing segment  112  to enable the non-conductive component  528  to extend into and through portions of a housing segment  112  away from an interlock feature. For example, hole  656  may be cut into the shelf  654 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  600 ,  602  or housing segments  112   d ,  112   f , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIGS.  6 B &amp;  6 C , where the non-conductive housing component  528  extends over the upper surfaces of the first and second interlock features  600 ,  602 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  600 ,  602  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   d ,  112   f  and extending parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   d ,  112   f  and rear cover  106   b.    
       FIGS.  7 A- 7 C  show examples of the interlock features  700 ,  702  that extend into an interior volume  732  defined at least partly by the sidewall  114 . The interlock features  700 ,  702  may extend inward, into the interior volume  732 , from adjacent ends of the first and fifth housing segments  112   a ,  112   e  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the first housing segment  112   a  is shown on the left, and a portion of the fifth housing segment  112   e  is shown on the right. As previously described, the first and fifth housing  112   a ,  112   e  segments may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. The non-conductive housing component may be part of the same non-conductive housing component that structurally couples the housing segments  112  described with reference to  FIGS.  5 A- 5 C and/or  6 A- 6 C , or a different non-conductive housing component. 
     A first interlock feature  700  may include a first protrusion  734  that extends inward from an end of the first housing segment  112   a , into the interior volume  732 . A second interlock feature  702  may include a second protrusion  736  that extends inward from an end of the fifth housing segment  112   e , into the interior volume  732 . As shown, the interlock features  700 ,  702  and their protrusions  734 ,  736  may be integrally defined by (e.g., molded with or machined into) the first and fifth housing segments  112   a ,  112   e  respectively. Alternatively, the interlock features  700 ,  702  and their protrusions  734 ,  736  may be structurally coupled to the first and fifth housing segments  112   a ,  112   e  in other ways, such as by welds or fasteners. Each of the interlock features  700 ,  702  and protrusions  734 ,  736  may be set slightly back from a gap along the sidewall  114  (i.e., an exterior or sidewall gap  706 ) to form an interior gap  708  between the housing segments  112   a ,  112   e  that has a greater width than the exterior gap  706 . For example, a first end surface  738  of the first housing segment  112   a  may be positioned opposite a second end surface  740  of the fifth housing segment  112   e  to define the exterior gap  706 . The first interlock feature  700  may have a first interlock surface  742  positioned opposite a second interlock surface  744  of the second interlock feature  702  to define the interior gap  708 . The first interlock surface  742  may be defined by the first protrusion  734 , and the second interlock surface  744  may be defined by the second protrusion  736 . The exterior gap  706  may have a first gap width, and the interior gap  708  may have a second gap width. In some embodiments, and as shown in  FIG.  7 A , the second gap width may be greater than the first gap width. 
     By way of example, the entirety of the first interlock feature  700  may be set back from the exterior gap  706  by an offset  710   a , whereas an outermost portion of the second interlock feature  702  may be set back from the exterior gap  706  by an offset  710   b , and an innermost portion of the second interlock feature  702  may widen into the interior gap  708  (e.g., part of the second interlock feature  702  may overlap the offset  710   b ). 
     A number of holes may be formed in each of the interlock features  700 ,  702  to enable a non-conductive housing component to extend into, through, or around the interlock features  700 ,  702  (thereby increasing the strength of the structural coupling between the first housing segment  112   a , the non-conductive housing component, and the fifth housing segment  112   e ). With reference to  FIGS.  7 A &amp;  7 B , a first hole  712  (e.g., a round through hole) may extend into the first interlock surface  742  of the first interlock feature  700 . In some embodiments, the first hole  712  may be formed by drilling a single hole into the first interlock feature  700 . Additional holes  714 ,  716  may also be formed in the first interlock feature  700 , as shown in  FIG.  7 B . The additional holes  714 ,  716  may provide additional surface area for the non-conductive housing component to hold or grab onto, retain, or conform to, thereby improving the strength of the structural coupling between the first and fifth housing segments  112   a ,  112   e . As an example, a second hole  714  (e.g., a round hole) may extend into an upper surface  746  of the first interlock feature  700  or protrusion  734 . The second hole  714  may be drilled or otherwise cut into the first interlock feature  700 , and may be transverse to (e.g., perpendicularly intersect) the first hole  712 . A third hole  716  (e.g., a round hole) may extend into a lower surface  748  of the first interlock feature  700  or protrusion  734 . The third hole  716  may be drilled or otherwise cut into the first interlock feature  700 , and may be transverse to (e.g., perpendicularly intersect) the first hole  712 . The second and third holes  714 ,  716  may have the same diameter or different diameters, and in some cases may be formed as a single through hole. The first interlock surface  742  of the first interlock feature  700  may be flat. 
     With reference to  FIGS.  7 A &amp;  7 C , a first hole  718  may extend into the second interlock surface  744  of the second interlock feature  702 . In some embodiments, the first hole  718  may be drilled or otherwise cut into the second interlock feature  702 . The first hole  718  may be formed as a through hole using a uniform diameter drill bit. A second hole  720  (e.g., a round hole) may extend into an upper surface  726  of the second interlock feature  702  or protrusion  734 . In some embodiments, the second hole  720  may be drilled or otherwise cut into the second interlock feature  702 , and may be transverse to (e.g., perpendicularly intersect) the first hole  718 . A third hole  722  (e.g., a round hole) may extend into a lower surface  752  of the second interlock feature  702  or protrusion  736 . In some embodiments, the third hole  722  may be drilled or otherwise cut into the second interlock feature  702 , and may be transverse to (e.g., perpendicularly intersect) the first hole  718 . The second and third holes  720 ,  722  may have the same diameter or different diameters, and in some cases may be formed as a single through hole. 
     A boss protrusion  724  (e.g., a screw boss), which in some cases may serve as a flex circuit connection point, may be machined into or structurally coupled to the fifth antenna segment  112   e , and may be integrated with the second interlock feature  702 . The boss protrusion  724  may have a surface that is angled (e.g., at a 10 degree angle, ±10%) with respect to an imaginary line extending perpendicular to the front and rear surfaces of a device. In alternative embodiments, the surface may be angled between 5 and 15 degrees, or between 0 (aligned with the imaginary line) and 20 degrees, or between 0 and 90 degrees. The boss protrusion  724  may be angled to reduce the inward extension of the second interlock feature  702  from the sidewall  114 , while also maintaining an upper surface  726  (of the second interlock feature  702 ) to which a device cover or other element may be mated or sealed. The boss protrusion  724  may be formed similarly to the boss protrusions  616 ,  624  formed in the first and second interlock features  600 ,  602  described with reference to  FIGS.  6 A- 6 C . Alternatively, the boss protrusion  724  may be formed by a protruding piece of metal that is CNC&#39;d off after non-conductive material(s) have been deposited into and around the first and second interlock features  700 ,  702 . A threaded hole  728  may be tapped into the boss protrusion  724  after the protruding piece of metal is CNC&#39;d off. CNC&#39;ing off the piece of protruding metal after the non-conductive material(s) have been deposited may prevent the boss protrusion  724  from becoming buried in the non-conductive material(s). Similarly to the boss protrusion  624 , the boss protrusion  724  may have a threaded hole  728  with a shallower thread depth, so that the threaded hole  728  does not intersect the first hole  718  formed in the second interlock feature  702 . 
     The second interlock feature  702  may form part of (or abut) an antenna tuning feature (e.g., a slot antenna feature  730  formed between the fifth housing segment  112   e  and a support plate to which the first and fifth housing segments  112   a ,  112   e  are structurally coupled). In some embodiments, the antenna tuning feature may be defined by a variable thickness of the fifth housing segment  112   e  along the sidewall  114 . For example, the slot antenna feature  730  may extend from the second interlock feature  702  along the fifth housing segment  112   e , and may be defined by a thinned portion of the fifth housing segment  112   e . The wider portions of the fifth housing segment  112   e , adjacent each end of the thinned portion, may taper into the thinned portion (e.g., with an arc or other profile), as shown, or there may be an abrupt transition (e.g., a step) from each wider portion to the thinned portion. 
     As shown in  FIGS.  7 B &amp;  7 C , a non-conductive housing component  528  may at least partially fill or extend into the first and second interlock features  700 ,  702 . Surrounding as many surfaces of the interlock features  700 ,  702  as possible with the non-conductive material(s) of a non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  700 ,  702  and the non-conductive housing component  528 . In some embodiments, the non-conductive housing component  528  may extend into holes  712 ,  714 ,  716 ,  718 ,  720 , and  722 . 
     In some embodiments, a shelf or shelves may be cut into the upper surfaces of the first and fifth housing segments  112   a ,  112   e  or first and second interlock features  700 ,  702 . For example, a shelf  754  may be cut into the upper surface  746  of the first interlock feature  700 . In some embodiments, holes may be formed in an upper surface or shelf of a housing segment  112  to enable the non-conductive component  528  to extend into and through portions of a housing segment  112  away from an interlock feature. For example, holes  756 ,  758 , and  760  may be cut into the shelf  754 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  700 ,  702  or housing segments  112   a ,  112   e , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIGS.  7 B &amp;  7 C , where the non-conductive housing component  528  extends over the upper surfaces of the first and second interlock features  700 ,  702 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  700 ,  702  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   a ,  112   e  and extending parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   a ,  112   e  and rear cover  106   b.    
       FIGS.  8 A- 8 C  show examples of the interlock features  800 ,  802  that extend into an interior volume  834  defined at least partly by the sidewall  114 . The interlock features  800 ,  802  may extend inward, into the interior volume  834 , from adjacent ends of the sixth and second housing segments  112   f ,  112   b  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the sixth housing segment  112   f  is shown on the left, and a portion of the second housing segment  112   b  is shown on the right. As previously described, the sixth and second housing segments  112   f ,  112   b  may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. The non-conductive housing component may be part of the same non-conductive housing component that structurally couples the housing segments  112  described with reference to  FIGS.  5 A- 7 C , or a different non-conductive housing component. 
     A first interlock feature  800  may include a first protrusion  836  that extends inward from an end of the sixth housing segment  112   f , into the interior volume  834 . A second interlock feature  802  may include a second protrusion  838  that extends inward from an end of the second housing segment  112   b . As shown, the interlock features  800 ,  802  and their protrusions may be integrally defined by (e.g., molded with or machined into) the sixth and second housing segments  112   f ,  112   b  respectively. Alternatively, the interlock features  800 ,  802  and their protrusions  836 ,  838  may be structurally coupled to the sixth and second housing segments  112   f ,  112   b  in other ways, such as by welds or fasteners. Each of the interlock features  800 ,  802  and protrusions  836 ,  838  may be set slightly back from a gap along the sidewall  114  (i.e., an exterior or sidewall gap  806 ) to form an interior gap  808  between the housing segments  112   f ,  112   b  that has a greater width than the exterior gap  806 . For example, a first end surface  840  of the sixth housing segment  112   f  may be positioned opposite a second end surface  842  of the second housing segment  112   b  to define the exterior gap  806 . The first interlock feature  800  may have a first interlock surface  844  positioned opposite a second interlock surface  846  of the second interlock feature  802  to define the interior gap  808 . The first interlock surface  844  may be defined by the first protrusion  836 , and the second interlock surface  846  may be defined by the second protrusion  838 . The exterior gap  806  may have a first gap width, and the interior gap  808  may have a second gap width. In some embodiments, and as shown in  FIG.  8 A , the second gap width may be greater than the first gap width. 
     By way of example, the entirety of the second interlock feature  802  may be set back from the exterior gap  806  by an offset  810   b , whereas an outermost portion of the first interlock feature  800  may be set back from the exterior gap  806  by an offset  810   a , and an innermost portion of the first interlock feature  800  may widen into the interior gap  808  (e.g., part of the first interlock feature  800  may overlap the offset  810   a ). 
     A number of holes may be formed in each of the interlock features  800 ,  802  to enable a non-conductive housing component to extend into, through, or around the interlock features  800 ,  802  (thereby increasing the strength of the structural coupling between the fifth housing segment  112   e , the non-conductive housing component, and the second housing segment  112   b ). For example, each of the interlock features  800 ,  802  may include a first hole  812  or  814  (e.g., a through hole) that extends into the first interlock surface  844  or the second interlock surface  846 . The first hole  812  or  814  may be formed by drilling a single hole into each interlock feature  800 ,  802  or protrusion  836 ,  838 . Additional holes may also be formed in each interlock feature  800 ,  802  or protrusion  836 ,  838 , as shown in  FIGS.  7 B &amp;  7 C . The additional holes may provide additional surface area for non-conductive housing component(s) to hold or grab onto, retain, or conform to, thereby improving the strength of the structural coupling between the sixth and second housing segments  112   f ,  112   b . As an example, a second hole  816  or  818  (e.g., a round hole) may extend into an upper surface  848  or  850  of each interlock feature  800 ,  802  or protrusion  836 ,  838 . The second holes  816 ,  818  may be drilled or otherwise cut into each interlock feature  800 ,  802 , and may be transverse to (e.g., perpendicularly intersect) the first hole  812  or  814 . A third hole  820  or  822  (e.g., a round hole) may extend into a lower surface  852  or  854  of each interlock feature  800 ,  802  or protrusion  836 ,  838 . The third holes  820 ,  822  may be drilled or otherwise cut into each interlock feature  800 ,  802 , and may be transverse to (e.g., perpendicularly intersect) the first hole  812  or  814 . The second and third holes  816 - 822  may have the same diameter or different diameters, and in some cases may be formed as respective single through holes. The formation of all three holes  812 - 822  by means of drilling (e.g., instead of by end milling) may save cost and reduce cycle time without sacrificing the integrity of the structural coupling between the sixth and second housing segments  112   f ,  112   b.    
     A boss protrusion  824  (e.g., a screw boss), which in some cases may serve as a flex circuit connection point (e.g., an antenna tuning connector point), may be machined in or structurally coupled to the sixth antenna segment  112   f , and may be integrated with the first interlock feature  802 . The boss protrusion  824  may have a surface  826  that is angled (e.g., at a 10 degree angle, ±10%) with respect to an imaginary line extending perpendicular to a front and rear surfaces of a device. In alternative embodiments, the surface may be angled between 5 and 15 degrees, between 0 (aligned with the imaginary line) and 20 degrees, or between 0 and 90 degrees. The boss protrusion  824  may be angled to reduce the inward extension of the first interlock feature  800  from the sidewall  114 , while also maintaining an upper surface  828  (of the first interlock feature  800 ) to which a device cover or other element may be mated or sealed. The boss protrusion  824  may be formed similarly to the boss protrusion  724  described with reference to  FIGS.  7 A &amp;  7 C . Similarly to the boss protrusion  724 , the boss protrusion  824  may have a threaded hole  830  with a shallower thread depth, so that the threaded hole  830  does not intersect the first hole  812  formed in the first interlock feature  800 . 
     The first interlock feature  800  may form part of (or abut) an antenna tuning feature (e.g., a slot antenna feature  832  formed between the sixth housing segment  112   f  and a support plate to which the sixth and second housing segments  112   f ,  112   b  are structurally coupled). In some embodiments, the antenna tuning feature may be defined by a variable thickness of the sixth housing segment  112   f  along the sidewall  114 . For example, the slot antenna feature  832  may extend from the first interlock feature  800  along the sixth housing segment  112   f , and may be defined by a thinned portion of the sixth housing segment  112   f . The wider portions of the sixth housing segment  112   f , adjacent each end of the thinned portion, may taper into the thinned portion (e.g., with an arc or other profile), as shown, or there may be an abrupt transition (e.g., a step) from each wider portion to the thinned portion. 
     As shown in  FIGS.  8 B &amp;  8 C , a non-conductive housing component  528  may at least partially fill or extend into the first and second interlock features  800 ,  802 . Surrounding as many surfaces of the interlock features  800 ,  802  as possible with the non-conductive material(s) of a non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  800 ,  802  and the non-conductive housing component  528 . In some embodiments, the non-conductive housing component  528  may extend into holes  812 ,  814 ,  816 ,  818 ,  820 , and  822 . 
     In some embodiments, a shelf or shelves may be cut into the upper surfaces of the sixth and second housing segments  112   f ,  112   b  or first and second interlock features  800 ,  802 . For example, a shelf  856  may be cut into the upper surface  850  of the second interlock feature  802 . In some embodiments, holes may be formed in an upper surface or shelf of a housing segment  112  to enable the non-conductive component  528  to extend into and through portions of a housing segment  112  away from an interlock feature. For example, holes  858 ,  860 , and  862  may be cut into the shelf  856 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  800 ,  802  or housing segments  112   f ,  112   b , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIGS.  8 B &amp;  8 C , where the non-conductive housing component  528  extends over the upper surfaces of the first and second interlock features  800 ,  802 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  800 ,  802  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   f ,  112   b  and extending parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   f ,  112   b  and rear cover  106   b.    
       FIGS.  9 A- 9 C  show examples of the interlock features  900 ,  902  that extend into an interior volume  928  defined at least partly by the sidewall  114 . The interlock features  900 ,  902  may extend inward, into the interior volume  928 , from adjacent ends of the second and first housing segments  112   b ,  112   a  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the second housing segment  112   b  is shown on the left, and a portion of the first housing segment  112   a  is shown on the right. As previously described, the second and first housing segments  112   b ,  112   a  may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. The non-conductive housing component may be part of the same non-conductive housing component that structurally couples the housing segments  112  described with reference to  FIGS.  5 A- 8 C , or a different non-conductive housing component. 
     A first interlock feature  900  may include a first protrusion  930  that extends inward from an end of the second housing segment  112   b , into the interior volume  928 . A second interlock feature  902  may include a second protrusion  932  that extends inward from an end of the first housing segment  112   a , into the interior volume  928 . The first interlock feature  900  may be located near a port  904  formed through the second housing segment  112   b  (e.g., a pressure port, a speaker port, etc.). Because of the port  904 , the first interlock feature  900  may be somewhat thinner than the second interlock feature  902 . To compensate for the thinness of the first interlock feature  900  and improve its performance in a crushing mode, the first interlock feature  900  may protrude farther inward from the sidewall  114  than other interlock features (e.g., farther inward than the second interlock feature  902 ). In some embodiments, the second interlock feature  902  may also extend farther inward from the sidewall  114 , similarly to the first interlock feature  900 . 
     As shown, the interlock features  900 ,  902  may be integrally defined by (e.g., molded with or machined into) the second and first housing segments  112   b ,  112   a  respectively. Alternatively, the interlock features  900 ,  902  may be structurally coupled to the second and first housing segments  112   b ,  112   a  in other ways, such as by welds or fasteners. Each of the interlock features  900 ,  902  and protrusions  930 ,  932  may be set slightly back from a gap along the interior of the sidewall (i.e., an exterior or sidewall gap  906 ) to form an interior gap  908  between the housing segments  112   b ,  112   a  that has a greater width than the exterior gap  906 . For example, a first end surface  934  of the second housing segment  112   b  may be positioned opposite a second end surface  936  of the first housing segment  112   a  to define the exterior gap  906 . The first interlock feature  900  may have a first interlock surface  938  positioned opposite a second interlock surface  940  of the second interlock feature  902  to define the interior gap  908 . The first interlock surface  938  may be defined by the first protrusion  930 , and the second interlock surface  940  may be defined by the second protrusion  932 . The exterior gap  906  may have a first gap width, and the interior gap  908  may have a second gap width. In some embodiments, and as shown in  FIG.  9 A , the second gap width may be greater than the first gap width. 
     A number of holes may be formed in each of the interlock features  900 ,  902  to enable a non-conductive housing component to extend into, through, or around the interlock features  900 ,  902  (thereby increasing the strength of the structural coupling between the second housing segment  112   b , the non-conductive housing component, and the first housing segment  112   a ). With reference to  FIGS.  9 A &amp;  9 B , a first hole  912  (e.g., a through hole) may extend into the first interlock surface  938  of the first interlock feature  900 . In some embodiments, the first hole  912  may be formed by a set of multiple partially overlapping drill holes. Drilling multiple partially overlapping holes may save cost over forming the first hole  912  using an end mill. In some embodiments, the partially overlapping holes may be drilled close enough to reduce the ridges where holes overlap and thereby reduce the tendency of the ridges to operate as knives or chisels when a device is dropped. In alternative embodiments, the first hole  912  may be formed by an end mill or other means. 
     In addition to the first hole  912 , additional holes  914 ,  916 ,  918 ,  920  may extend into additional surfaces of the first interlock feature  900  or protrusion  930 , as shown in  FIGS.  9 A &amp;  9 B . The additional holes  914 - 920  may provide additional surface area for the non-conductive housing component(s) to hold or grab onto, retain, or conform to, thereby improving the strength of the structural coupling between the second and first housing segments  112   b ,  112   a . In some embodiments, the additional holes  914 - 920  may be drilled. The additional holes  914 - 920  may include second and third holes  914 ,  916  drilled into an upper surface  942  of the first interlock feature  900 , transverse to (e.g., perpendicularly intersecting) the first hole  912 ; a fourth hole  918  hole drilled into an inner surface  944  of the first interlock feature  900 , transverse to (e.g., perpendicularly intersecting) the first hole  912 ; and a fifth hole  920  drilled into a lower surface  946  of the first interlock feature  900 , transverse to the sidewall  114  and perpendicularly intersecting the first hole  912 . A non-conductive housing component may extend into, and through each of the holes  912 - 920 , and around various portions of the first interlock feature  900 . 
     A non-conductive housing component may extend through the first interlock  900  in five directions of an x/y/z coordinate space (e.g., in all directions but through the sidewall  114 ). This can increase the structural rigidity of the first interlock feature  900 , which can be useful given its thinner width. 
     With reference to  FIGS.  9 A &amp;  9 C , a first hole  922  (e.g., a round through hole) may extend into the second interlock surface  940  of the second interlock feature  90   s  or protrusion  932 . In some embodiments, the first hole  922  may be drilled or otherwise cut into the second interlock feature  902 . A second hole  924  (e.g., a round hole) may extend into an upper surface  948  of the second interlock feature  902  or protrusion  932 . The second hole  924  may also be drilled, and may be transverse to (e.g., perpendicularly intersect) the first hole  922 . A third hole  926  (e.g., a round hole) may extend into a lower surface  950  of the second interlock feature  902  or protrusion  932 . The third hole  926  may be drilled or otherwise cut into the second interlock feature  902  and be transverse to (e.g., perpendicularly intersect) the first hole  922 . The second and third holes  924 ,  926  may have the same diameter or different diameters, and in some cases may be formed as a single through hole. 
     As shown in  FIGS.  9 B &amp;  9 C , a non-conductive housing component  528  may at least partially fill or extend into the first and second interlock features  900 ,  902 . Surrounding as many surfaces of the interlock features  900 ,  902  as possible with the non-conductive material(s) of a non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  900 ,  902  and the non-conductive housing component  528 . In some embodiments, the non-conductive housing component  528  may extend into holes  912 ,  914 ,  916 ,  918 ,  920 ,  922 ,  924 , and  926 . 
     In some embodiments, a shelf or shelves may be cut into the upper surfaces of the second and first housing segments  112   b ,  112   a  or first and second interlock features  900 ,  902 . For example, a shelf  952  may be cut into the upper surface  948  of the second interlock feature  902 . In some embodiments, holes may be formed in an upper surface or shelf of a housing segment  112  to enable the non-conductive component  528  to extend into and through portions of a housing segment  112  away from an interlock feature. For example, holes  954  and  956  may be cut into the shelf  952 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  900 ,  902  or housing segments  112   b ,  112   a , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIGS.  9 B &amp;  9 C , where the non-conductive housing component  528  extends over the upper surfaces of the first and second interlock features  900 ,  902 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  900 ,  902  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   b ,  112   a  and extending parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   b ,  112   a  and rear cover  106   b.    
       FIGS.  10 A- 10 C  show examples of the interlock features  1000 ,  1002  that extend into an interior volume  1028  defined at least partly by the sidewall  114 . The interlock features  1000 ,  1002  may extend inward, into the interior volume  1028 , from adjacent ends of the third and fourth housing segments  112   c ,  112   d  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C , &amp;  4 . A portion of the third housing segment  112   c  is shown on the left, and a portion of the fourth housing segment  112   d  is shown on the right. As previously described, the third and fourth housing segments  112   c ,  112   d  may be separated by a gap along the sidewall  114  that is filled by a non-conductive housing component. The non-conductive housing component may be part of the same non-conductive housing component that structurally couples the housing segments  112  described with reference to  FIGS.  5 A- 9 C , or a different non-conductive housing component. Similarly, the interior volumes described with reference to  FIGS.  5 A,  6 A,  7 A,  8 A,  9 A , &amp;  10 A may be the same or different interior volumes. 
     A first interlock feature  1000  may include a first protrusion  1030  that extends inward from an end of the third housing segment  112   c , into the interior volume  1028 . A second interlock feature  1002  may include a second protrusion  1032  that extends inward from an end of the fourth housing segment  112   d , into the interior volume  1028 . As shown, the interlock features  1000 ,  1002  and their protrusions  1030 ,  1032  may be integrally defined by (e.g., molded with or machined into) the third and fourth housing segments  112   c ,  112   d  respectively. Alternatively, the interlock features  1000 ,  1002  may be structurally coupled to the third and fourth housing segments  112   c ,  112   d  in other ways, such as by welds or fasteners. 
     Each of the interlock features  1000 ,  1002  may be set slightly back from a gap along the interior of the sidewall  114  (i.e., an exterior or sidewall gap  1006 ) to form an interior gap  1008  between housing segments  112   c ,  112   d  that has a greater width than the exterior gap  1006 . For example, a first end surface  1034  of the third housing segment  112   c  may be positioned opposite a second end surface  1036  of the fourth housing segment  112   d  to define the exterior gap  1006 . The first interlock feature  1000  may have a first interlock surface  1038  positioned opposite a second interlock surface  1040  of the second interlock feature  1002  to define the interior gap  1008 . The first interlock surface  1038  may be defined by the first protrusion  1030 , and the second interlock surface  1040  may be defined by the second protrusion  1032 . The exterior gap  1006  may have a first gap width, and the interior gap  1008  may have a second gap width. In some embodiments, and as shown in  FIG.  10 A , the second gap width may be greater than the first gap width. 
     A number of holes may be formed in each of the interlock features  1000 ,  1002  to enable a non-conductive housing component to extend into, through, or around the interlock features  1000 ,  1002  (thereby increasing the strength of the structural coupling between the third housing segment  112   c , the non-conductive housing component, and the fourth housing segment  112   d ). With reference to  FIGS.  10 A &amp;  10 B , a first hole  1010  (e.g., a through hole) may extend into the first interlock surface  1038  of the first interlock feature  1000  or protrusion  1030 . The first hole  1010  may be formed by a set of multiple partially overlapping drill holes. In some embodiments, the partially overlapping holes may be drilled close enough to reduce the ridges where holes overlap and thereby reduce the tendency of the ridges to operate as knives or chisels when a device is dropped. In alternative embodiments, the first hole  1010  may be formed by an end mill or other means. 
     In addition to the first hole  1010 , additional holes  1012 ,  1014  may be formed in the first interlock feature  1000  or protrusion  1030 . The additional holes  1012 ,  1014  may provide additional surface area for the non-conductive housing component(s) to hold or grab onto, retain, or conform to, thereby improving the strength of the structural coupling between the third and fourth housing segments  112   c ,  112   d . In some embodiments, the additional holes  1012 ,  1014  may be drilled. The additional holes  1012 ,  1014  may include a second hole  1012  that extends into an upper surface  1018  of the first interlock feature  1000  or protrusion  1030 , transverse to (e.g., perpendicularly intersecting) the first hole  1010 , and a third hole  1014  that extends into an inner surface  1042  of the first interlock feature  1000  or protrusion  1030 , transverse to the sidewall  114  and first hole  1010  (e.g., perpendicularly intersecting the first hole  1010 ). A non-conductive housing component may extend into and through each of the holes  1010 - 1014 , and around various portions of the first interlock feature  1000 . A shelf  1016  may be cut into the upper surface  1018  of the first interlock feature  1000 . In some cases, the shelf  1016  may be curved. In some cases, the shelf  1016  may intersect the second hole  1012 . As shown, the shelf  1016  may intersect the second hole  1012  perpendicularly. The shelf  1016  may increase the separation or reduce the capacitance between the third housing segment  112   c  and a conductive component(s) that are routed near the third housing segment  112   c . In some embodiments, the shelf  116  may be covered by a non-conductive housing component  528 , as shown in  FIG.  10 B . 
     With reference to  FIGS.  10 A &amp;  10 C , a first hole  1020  (e.g., a round through hole) may extend into the second interlock surface  1040  of the second interlock feature  1002  or protrusion  1032 . In some embodiments, the first hole  1020  may be drilled or otherwise cut into the second interlock feature  1002 . A second hole  1022  (e.g., a round hole) may extend into an upper surface  1044  of the second interlock feature  1002  or protrusion  1032 , and may also be drilled or otherwise cut into the second interlock feature  1002 . The second hole  1022  may be transverse to (e.g., perpendicularly intersect) the first hole  1020 . A third hole  1024  (e.g., a round hole) may extend into a lower surface  1046  of the second interlock feature  1002  or protrusion  1032 . In some embodiments, the third hole  1024  may be drilled or otherwise cut into the second interlock feature  1002 , transverse to (e.g., perpendicularly intersecting) the first hole  1020 . The second and third holes  1022 ,  1024  may have the same diameter or different diameters, and in some cases may be formed as a single through hole. 
     As shown in  FIG.  10 A , a boss protrusion  1026  (e.g., a screw boss) may be integrated with the second interlock feature  1002  or protrusion  1032 . In some embodiments, the boss protrusion  1026  may be formed as described with reference to  FIG.  6 A . 
     As shown in  FIGS.  10 B &amp;  10 C , a non-conductive housing component  528  may at least partially fill or extend into the first and second interlock features  1000 ,  1002 . Surrounding as many surfaces of the interlock features  1000 ,  1002  as possible with the non-conductive material(s) of a non-conductive housing component  528  may tend to increase the strength of the structural coupling between the interlock features  1000 ,  1002  and the non-conductive housing component  528 . In some embodiments, the non-conductive housing component  528  may extend into holes  1010 ,  1012 ,  1014 ,  1020 ,  1022 , and  1024 . 
     In some embodiments, a shelf or shelves may be cut into a housing segment  112  (e.g., into the fourth housing segment  112   d ). For example, a shelf  1048  may be cut into the fourth housing segment  112   d  above the upper surface  1044  of the second interlock feature  802 . In some embodiments, holes may be formed in the shelf  1048  to enable the non-conductive component  528  to extend into and through the shelf  1048 . For example, holes  1050  and  152  may be cut into the shelf  1048 . 
     In some embodiments, a front cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) may be bonded to upper surfaces of the first and second interlock features  1000 ,  1002  or housing segments  112   c ,  112   d , or upper surfaces of the non-conductive housing component  528  (e.g., as shown in  FIGS.  10 B &amp;  10 C , where the non-conductive housing component  528  extends over the upper surfaces of the first and second interlock features  1000 ,  1002 ). In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to lower surfaces of the first and second interlock features  1000 ,  1002  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   c ,  112   d  and extending parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   c ,  112   d  and rear cover  106   b.    
     In some embodiments, one or more surfaces of the interlock features described with reference to  FIGS.  5 A- 10 C  may be etched, machined, or treated to make the surface textured or porous. For example, in some embodiments, some surfaces of the interlock features may be etched to form pores that are 2-3 microns deep and 2-3 microns wide. Such pores provide additional blind holes for non-conductive housing components to flow into, thereby increasing the structural bond between interlock features and non-conductive housing components. In areas where a wall of an interlock feature is thin, the surface of the wall may not be etched, or etching may be controlled to ensure that pores do not break through the wall (e.g., to avoid sealing issues for different holes or cavities). 
       FIGS.  11 A &amp;  11 B  illustrate how exterior (sidewall) and interior gaps between the housing segments  112  described with reference to  FIGS.  2 A,  3 A- 3 C,  4 ,  5 A,  6 A,  7 A,  8 A,  9 A , &amp;  10 A may be aligned symmetrically or asymmetrically.  FIG.  11 A  shows corresponding exterior and interior gaps  1100 ,  1102  that are aligned symmetrically.  FIG.  11 B  shows corresponding exterior and interior gaps  1124 ,  1126  that are aligned asymmetrically. 
     By way of example,  FIG.  11 A  shows a generic representation of two adjacent housing segments  1104 ,  1106  that may form part of a sidewall  1108  of a housing. A first interlock feature  1110  may have a protrusion  1130  that extends inward from an end of the first housing segment  1104 , into an interior volume  1132  defined at least partly by the sidewall  1108 . A second interlock feature  1112  may have a protrusion  1134  that extends inward from an end of the second housing segment  1106 , into the interior volume  1132 . An exterior gap  1100  may be defined between the first and second housing segments  1104 ,  1106 . The interlock features  1110 ,  1112  may be set back from the exterior gap  1100  to from an interior gap  1102  that has a greater width than the exterior gap  1100 . For example, a first end surface  1136  of the first housing segment  1104  may be positioned opposite a second end surface  1138  of the second housing segment  1106  to define the exterior gap  1100 . The first interlock feature  1110  may have a first interlock surface  1140  positioned opposite a second interlock surface  1142  of the second interlock feature  1112  to define the interior gap  1102 . The first interlock surface  1140  may be defined by the first protrusion  1130 , and the second interlock surface  1142  may be defined by the second protrusion  1134 . The exterior gap  1100  may have a first gap width, and the interior gap  1102  may have a second gap width. In some embodiments, and as shown in  FIG.  11 A , the second gap width may be greater than the first gap width. 
     The first interlock surface  1140  may be offset from the first end surface  1136  by a first offset  1114   a , and the second interlock surface  1142  may be offset from the second end surface  1138  by a second offset  1114   b , which offsets  1114   a ,  1114   b  may be the same such that the exterior and interior gaps  1100 ,  1102  are aligned symmetrically. A non-conductive housing component may overlap interior surfaces of the housing segments  1104 ,  1106  along the sidewall  1108  (i.e., extend along the offsets  1114   a ,  1114   b ) and fill the exterior and interior gaps  1100 ,  1102 . 
     In some embodiments, the non-conductive housing component may be formed by a polymer material having a fiber fill, and the polymer material may at least partially fill various holes in the first and second interlock features  1110 ,  1112  in addition to forming an exterior surface of the sidewall  1108  (e.g., a portion of the sidewall  1108  that bridges or fills the exterior gap  1100 ). In other embodiments, the non-conductive housing component may include a first portion formed from a first polymer material and a second portion formed from a second polymer material. The first polymer material may have a fiber fill and at least partially fill various holes in the first and second interlock features. The second polymer material may be different from the first polymer material and form an exterior surface of the sidewall  1108  (e.g., a portion of the sidewall  1108  that bridges or fills the exterior gap  1100 ). Each polymer having a fiber fill may have a fiber fill including glass or other types of fibers. In some embodiments, the second polymer material may also have a fiber fill, but have a fiber fill that differs from the fiber fill of the first polymer material. 
     Also by way of example,  FIG.  11 B  shows a generic representation of two adjacent housing segments  1116 ,  1118  that may form part of a sidewall  1108  of a housing. A first interlock feature  1120  may have a protrusion  1144  that extends inward from an end of the first housing segment  1116 , into an interior volume  1146  defined at least partly by the sidewall  1108 . A second interlock feature  1122  may have a protrusion  1148  that extends inward from an end of the second housing segment  1118 , into the interior volume  1146 . An exterior gap  1124  may be defined between the first and second housing segments  1116 ,  1118 . The interlock features  1120 ,  1122  may be set back from the exterior gap  1124  to from an interior gap  1126  that has a greater width than the exterior gap  1124 . For example, a first end surface  1150  of the first housing segment  1116  may be positioned opposite a second end surface  1152  of the second housing segment  1118  to define the exterior gap  1124 . The first interlock feature  1120  may have a first interlock surface  1154  positioned opposite a second interlock surface  1156  of the second interlock feature  1122  to define the interior gap  1126 . The first interlock surface  1154  may be defined by the first protrusion  1144 , and the second interlock surface  1156  may be defined by the second protrusion  1148 . The exterior gap  1124  may have a first gap width, and the interior gap  1126  may have a second gap width. In some embodiments, and as shown in  FIG.  11 B , the second gap width may be greater than the first gap width. 
     The first interlock surface  1154  may be offset from the first end surface  1150  by a first offset  1128   a , and the second interlock surface  1156  may be offset from the second end surface  1152  by a second offset  1128   b , which offsets  1128   a ,  1128   b  may differ such that the exterior and interior gaps  1124 ,  1126  are aligned asymmetrically. A non-conductive housing component may overlap interior surfaces of the housing segments  1116 ,  1118  along the sidewall  1108  (i.e., extend along the offsets  1128   a ,  1128   b ) and fill the exterior and interior gaps  1124 ,  1126 . 
     Asymmetrically aligned exterior and interior gaps  1124 ,  1126  may enable adjacent interlock features  1120 ,  1122  to be shifted in position along a housing sidewall  1108  while still providing sufficient separation between conductive housing segments  1116 ,  1118  that may be operated as antennas. Sufficient separation may be needed to mitigate the likelihood that the housing segments  1116 ,  1118  couple to one another (thereby enabling the conductive housing segments to resonate independently) and/or to reduce the capacitance between the conductive housing segments. 
     In some embodiments, the thickness of a housing segment at a boundary of an exterior gap may be defined as a function of the width of the exterior gap, or conversely, the width of the exterior gap may be defined as a function of the thickness of the housing segment at the boundary of the exterior gap. For example, the thickness of the housing segment  1104  or  1116  at the boundary of the exterior gap  1100  (see  FIGS.  11 A &amp;  11 B ) may be defined as a function of the width of the exterior gap  1100  or  1124 . 
     In some embodiments, the thickness of a housing segment at a boundary of an interior gap may be defined as a function of the width of the interior gap, or conversely, the width of the exterior gap may be defined as a function of the thickness of the housing segment at the boundary of the interior gap. For example, the width of the interior gap  1102  or  1126  may be defined as a function of the thickness of the housing segment  1104  or  1116  at the boundary of the interior gap  1102  or  1126  (see  FIGS.  11 A &amp;  11 B ). 
     In some embodiments, the width of the exterior or interior gaps described with reference to  FIGS.  11 A &amp;  11 B  may be otherwise defined to reduce capacitance or coupling between the ends of adjacent conductive housing segments while also maintaining good structural rigidity of the sidewall  1108 . 
     Turning to  FIG.  12   , there is shown an isometric view of the first housing segment  112   a  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C,  4 ,  7 A- 7 B,  9 A , &amp;  9 C and portions  116   a ,  116   c ,  1204  of the non-conductive housing component  528  that abut, fill, and surround the interlock features  902 ,  700  and other interior surfaces of the first housing segment  112   a . As shown, a first portion  1204  of the non-conductive housing component  528  may form a gusset  1200  that extends from under the lower surfaces of the first housing segment  112   a  (including lower surfaces of its interlock features  902 ,  700 ) to over, under, or onto a support plate (e.g., over, under, onto, or encapsulating the support plate  110  described with reference to  FIG.  4   ). The first portion  1204  of the non-conductive housing component  528  may also extend at least partially into the interlock features  902 ,  700 , into other features of the first housing segment  112   a , and along an interior surface of the sidewall  114 . The first portion  1204  of the non-conductive housing component  528  may also extend into the interlock features  900 ,  702  extending from adjacent ends of other housing segments (e.g., the second housing segment and the fifth housing segment  112   b ,  112   e  described with reference to other figures). A strengthening rib or buttress  1202   a  may be formed between the gusset  1200  and portions of the non-conductive housing component  528  that extend along the interior surface of the sidewall  114 . The gusset  1200  and/or buttress  1202   a  may improve the rigidity of the first housing segment  112   a  and its structural couplings to adjacent housing segments, and in some cases may span that portion of a corner that lies between an interlock feature  900  at an end of the second housing segment to an interlock feature  702  at an end of the fifth housing segment. Other buttresses, such as buttress  1202   b , may also be formed by the first portion  1204  of the non-conductive housing component  528 . In some embodiments, an adhesive may bond the first portion  1204  of the non-conductive housing component (e.g., the gusset  1200 ) to the support plate  110 . The gusset  1200  and buttresses  1202   a ,  1202   b  may be replicated in other corners of the sidewall  114 , and may provide extra structural support for a housing segment mounted at the corner of a device (and in particular, a housing segment that wraps just around a corner of a device). 
     As also shown in  FIG.  12   , second portions  116   e ,  116   c  of the non-conducive housing component  528  may fill portions of the gaps between housing segments  112  and form exterior surface portions of the sidewall  114 . In some embodiments, the first portion  1204  of the non-conductive housing component  528  may provide more structural rigidity, and the second portions  116   e ,  116   c  of the non-conductive housing component  528  may have a more uniform consistency than the first portion  1204  and provide a smoother exterior surface along the sidewall  114 . 
     In some embodiments, the entirety of the non-conductive housing component  528  may be formed by a polymer material having a fiber fill, and the polymer material may at least partially fill various holes in the interlock features  900 ,  902 ,  700 ,  702 , in addition to forming exterior surface portions of the sidewall  114 . In other embodiments, the non-conductive housing component  528  may include the first portion  1204 , which may be formed from a first polymer material, and the second portions  116   e ,  116   c , which may be formed from a second polymer material. The first polymer material may have a fiber fill and at least partially fill various holes in the first and second interlock features. The second polymer material may be different from the first polymer material and form an exterior surface of the sidewall  114 . Each polymer having a fiber fill may have a fiber fill including glass or other types of fibers. In some embodiments, the second polymer material may also have a fiber fill, but have a fiber fill that differs from the fiber fill of the first polymer material. 
     Boss protrusions  1204 ,  1206  (e.g., screw bosses) may be formed (e.g., machined into) portions of the first housing segment  112   a  that extend inward from a lower surface of the first housing segment  112   a  (i.e., into a surface of the first housing segment  112   a  that is oriented toward the rear of a device). In some embodiments, the boss protrusions  1204 ,  1206  may be formed using the previously-described hole cutter. The boss protrusions  1204 ,  1206  may be tapped to receive screws that attach a flex circuit to each of the boss protrusions  1204 ,  1206 , thereby attaching the flex circuit to the first housing segment  112   a . The boss protrusion  1204  to the left in  FIG.  12    may provide a ground connector, and the boss protrusion  1206  to the right may provide an antenna feed connector (alternatively referred to as just a “feed connector”). The boss protrusions  1204 ,  1206  may be formed on separate inward extensions of the first housing segment  112   a , to increase the length of the conductive path (or increase the length of the resonant portion of the first housing segment  112   a ) therebetween. 
       FIGS.  13 A- 13 D  show various details of a device forehead (e.g., the portion of a device extending under, over, or above a top edge of a device display), and  FIGS.  14 A- 14 G  show various details of a device chin (e.g., the portion of a device extending under, over, or below a bottom edge of a device display). 
       FIG.  13 A  shows a plan view of the third and fourth housing segments  112   c ,  112   d  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  5 A,  5 C,  6 A,  6 B , &amp;  10 A- 10 C, and portions of the fifth and sixth housing segments  112   e ,  112   f .  FIG.  13 A  also shows a non-conductive housing component  528  that structurally couples all of these components, including portions  116   a ,  116   b ,  116   f  of the non-conductive housing component  528  that differ from another portion  1354  (e.g., a more rigid portion) of the non-conductive housing component  528  and form non-conductive segments or portions of the sidewall  114 . 
     As shown, the support plate  110  may have a deep recess  1300  extending inward from an edge  1302  of the support plate  110  that is closer to the sidewall  114 . The recess  1300  may accommodate the positioning of components attached to a flex circuit, and may enable the flex circuit to be positioned very close to the sidewall  114 . 
     When the housing segments  112  are conductive and used as antennas, slots in the support plate  110  (e.g., slot  1304 ) may couple to the housing segments  112  and undesirably alter antenna operation or decrease antenna efficiency. In some embodiments, a parasitic slot in the support plate  110  (e.g., slot  1304 ) may be electrically closed or shorted (e.g., by welding a conductive component  1306  such as a strap between opposite edges of the slot  1304 , at or near an open end  1308  of the slot  1304 , or at other points between opposite edges of the slot  1304 ). Parasitic slots are slots that detract from antenna performance, and differ from slot antenna features that can be used to tune antenna performance. 
       FIG.  13 A  shows the camera brace  402  described with reference to  FIG.  4   . In some embodiments, the camera brace  402  may be grounded, and a ground connector  1310  of the fourth housing segment  112   d  may be coupled to ground via the grounded camera brace  402 . Electrically coupling the ground connector  1310  of the fourth housing segment  112   d  to ground via the camera brace  402  may be easier than coupling the ground connector  1310  to a ground on a flex circuit given the small clearances between the camera brace  402  and adjacent housing segments  112   c ,  112   d ,  112   f . However, because a device may be dropped on the corner including the fourth housing segment  112   d , a welded or other rigid connection between the camera brace  402  and ground connector  1310  may have a tendency to break when the device is dropped. To mitigate the likelihood of the ground between the camera brace  402  and the ground connector  1310  being disrupted, the ground connector  1310  may be electrically coupled to the camera brace  402  using a compliant conductive component  1312 , such as a compliant conductive tab or strap that extends from one of the camera brace  402  or ground connector  1310  and is welded to the other of the ground connector  1310  or camera brace  402 . Alternatively, the compliant conductive component  1312  (e.g., a wire, strap, or thin metal plate) may be welded or otherwise electrically coupled to each of the camera brace  402  and ground connector  1310 . 
     As shown in  FIG.  13 B , a ground pad  1314 , to which a ground spring may be mated, may be formed on the camera brace  402 . In some embodiments, the ground pad  1314  may be formed on a side  1316  of the camera brace  402  facing the sixth housing segment  112   f  (e.g., in a channel  1318  between the side  1316  of the camera brace  402  and the sixth housing segment  112   f ). To improve the electrically continuity of the ground connection and reduce ground noise, the ground pad  1314  may include a gold plate (or gold-plated plate) that is welded to the stainless steel or other conductive material that forms the camera brace  402 . The ground spring that is mated to the ground pad  1314  may be formed on a flex circuit, which flex circuit is disposed in the channel  1318  with the ground spring facing and contacting the ground pad  1314  (the ground spring is not shown in  FIG.  13 B , but is shown in  FIG.  17 B ). Gold-on-gold contact (e.g., a gold or gold-plated ground pad  1314  and ground spring) may be useful here and in other locations where spring contacts, and especially low-force spring contacts, are electrically coupled to a conductive pad. When an RF signal passes through a spring junction, the spring junction can introduce harmonics that interfere with wireless communication (e.g., particular wireless frequency bands). Gold-on-gold contact can reduce the likelihood or amplitude of such harmonics. 
       FIG.  13 C  shows internal structures and connections of the device forehead, as viewed while looking from the front of the device toward the rear of the device. The connections include various antenna connections made between the third, fourth, and fifth housing segments  112   c ,  112   d ,  112   e  and one or more antenna flex circuits. Examples of the antenna flex circuits are described in more detail with reference to  FIGS.  17 A &amp;  17 B . The antenna flex circuits may extend grounds to the ground connections of the housing segments  112   c ,  112   d ,  112   e , carry signals to and from antenna feed connectors, and/or carry antenna tuning components (e.g., components that may be used to tune the resonance, frequency, or bandwidth of a housing segment that is operated as an antenna). 
     As shown in  FIG.  13 C , the third housing segment  112   c  may include a ground connector  1320 , a feed connector  1322 , and a tuning connector  1324 . The ground connector  1320  may be electrically coupled to the support plate  110  (and thereby to ground) by a flex circuit that connects to both the ground connector  1320  and a ground connector  1326  on the support plate  110 . In some embodiments, the ground connector  1320  may be positioned at the corner defined by the third housing segment  112   c . The feed connector  1322  may be positioned in from the corner, along a top edge  1328  of a device. The tuning connector  1324  may be positioned near the center of the top edge  1328 . Both the feed connector  1322  and the tuning connector  1324  may be electrically coupled to a flex circuit. In some embodiments, each of the ground connector  1320 , the feed connector  1322 , the tuning connector  1324 , and the support plate ground connector  1326  may be electrically coupled to a common flex circuit, such as the flex circuit described with reference to  FIG.  17 B . The same flex circuit may also provide electrical connectors for grounding the fifth housing segment  112   e  (e.g., at a ground connector  1330 ), and tuning components that connect to the tuner ground connector  1332 . 
     As also shown in  FIG.  13 C , the fourth housing segment  112   d  may also include a ground connector  1334 , a feed connector  1336 , and a tuning connector  1338 . The ground connector  1334  may be electrically coupled to the camera brace  402  (e.g., using the compliant conductive component  1312  described with reference to  FIG.  13 A ). A flex circuit, such as the flex circuit described with reference to  FIG.  17 B , may carry a ground spring that is mated to a ground pad on the camera brace  402  (e.g., the ground pad  1314  described with reference to  FIG.  13 B ). The ground potentials of the flex circuit and the fourth housing segment  112   d  may therefore be electrically coupled through the camera brace  402 . Other ground connections for the camera brace  402  may be made, for example, through the support plate  110  or camera module bias springs  1340 ,  1342  disposed at points along the perimeter of the camera brace  402 . The ground and feed connectors  1334 ,  1336  for the fourth housing segment  112   d  may be disposed near opposite ends of the fourth housing segment  112   d , and in some embodiments, the ground connector  1334  may be positioned more toward the top edge  1328  of the device, and the feed connector  1336  may be positioned more toward a side edge  1344  of the device. The tuning connector  1338  for the fourth housing segment  112   d  may be on the sixth housing segment  112   f  and may take the form of the boss protrusion described with reference to  FIG.  6 A . The tuning connector  1338  may be coupled to the flex circuit described with reference to  FIG.  17 B , which flex circuit may carry tuning components such as a circuit including a switch that may be operated to connect or disconnect the slot antenna feature  302   d  (see,  FIG.  3 A ) defined between the sixth housing segment  112   f  and the support plate  110  to the fourth housing segment  112   d.    
     The third housing segment  112   c  may in some cases have a Fargo feed connector  1346 . The Fargo feed connector  1346  may be located along the top edge  1328  of the device, near the end of the third housing segment  112   c  that is adjacent the fourth housing segment  112   d . The Fargo feed connector  1346  may alternatively be located in other places along the third housing segment  112   c.    
       FIG.  13 C  shows example positions of a speaker  1348 , camera  1350 , and bio-authentication sensor  1352  (e.g., an infrared camera) that may be mounted in the device forehead. Ground connections  1354 ,  1356  for these components, or other components located in the device forehead, may be provided near the top edge  1328  of the device as shown. 
       FIG.  13 D  shows additional internal structures and connections of the device forehead, as viewed while looking from the rear of a device toward the front cover  106   a  of the device. The structures include the camera  1350  and bio-authentication sensor  1352  described with reference to  FIG.  13 C . A cross-section of the device forehead is shown in  FIG.  22   . 
     Turning now to the device chin,  FIG.  14 A  shows a plan view of the first and second housing segments  112   a ,  112   b  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  7 A,  7 B,  8 A,  8 C , &amp;  9 A- 9 C, and portions of the fifth and sixth housing segments  112   e ,  112   f .  FIG.  14 A  also shows a non-conductive housing component  528  that structurally couples all of these components, including portions  116   c ,  116   d ,  116   e  of the non-conductive housing component  528  that differ from another portion  1474  of the non-conductive housing component and form non-conductive segments or portions of the sidewall  114 . 
     As shown, the support plate  110  may have one or more deep recesses  1400 ,  1402  extending inward from an edge  1404  of the support plate  110  that is closer to the sidewall  114 . The recesses  1400 ,  1402  may accommodate the positioning of components attached to a flex circuit, and may enable the flex circuit to be positioned very close to the sidewall  114 . 
     A first slot antenna feature  302   a  may be formed between the fifth housing segment  112   e  and the support plate  110 , and a second slot antenna feature  302   b  may be formed between the sixth housing segment  112   f  and the support plate. 
       FIG.  14 B  shows internal structures and connections of the device chin, as viewed while looking from the front of a device toward the rear of the device. The connections include various antenna connections made between the first, second, fifth, and sixth housing segments  112   a ,  112   b ,  112   e ,  112   f  and one or more antenna flex circuits. Examples of the antenna flex circuits are described in more detail with reference to  FIG.  17 A . The antenna flex circuits may extend grounds to the ground connectors  1406 ,  1408  of the housing segments  112   a ,  112   b , carry signals to and from the antenna feed connectors  1410 ,  1412 , and carry antenna tuning components that are coupled to the tuning connectors  1414 ,  1416 . 
     As shown in  FIG.  14 B , the first housing segment  112   a  may include a ground connector  1406 , a feed connector  1410 , and a tuning connector  1414 . The ground connector  1406  may be electrically coupled to the support plate  110  (and thereby to ground) by a flex circuit that connects to both the ground connector  1406  and a ground connector  1418  on the support plate  110 . In some embodiments, the ground connector  1406  may be positioned closer to the left edge  1420  of the device (away from the second housing segment  112   b ), and the feed connector  1410  may be positioned closer to the lower edge  1422  of the device. The tuning connector  1414  for the first housing segment  112   a  may be on the fifth housing segment  112   e  and take the form of the boss protrusion  724  described with reference to  FIG.  7 A . The tuning connector  1414  may be coupled to the flex circuit described with reference to  FIG.  17 A , which flex circuit may carry tuning components such as a circuit including a switch that may be operated to connect or disconnect the slot antenna feature  302   a  (see,  FIG.  14 A ) defined between the fifth housing segment  112   e  and the support plate  110  to the first housing segment  112   a . Points along the slot antenna feature  302   a  may be grounded to the support plate at connectors  1414  and  1424 . 
     As also shown in  FIG.  14 B , the second housing segment  112   b  may also include a ground connector  1408 , a feed connector  1412 , and a tuning connector  1416 . The ground connector  1408  may be electrically coupled to the support plate  110  (and thereby to ground) by a flex circuit that connects to the ground connector  1408  and one or more ground connectors  1426 ,  1428 ,  1430 ,  1432  on the support plate  110  or sixth housing segment  112   f . In some embodiments, the ground connector  1408  may be positioned closer to the right edge  1434  of the device (away from the first housing segment  112   a ), and the feed connector  1412  may be positioned closer to the lower edge  1422  of the device. The tuning connector  1416  may be positioned near the center of the lower edge  1422 . Both the feed connector  1412  and the tuning connector  1416  may be electrically coupled to a flex circuit. In some embodiments, each of the ground connector  1408 , the feed connector  1412 , the tuning connector  1416 , and the support plate ground connectors  1426 ,  1428 ,  1430 ,  1432  may be electrically coupled to a common flex circuit, such as the flex circuit described with reference to  FIG.  17 A . The same flex circuit may also provide tuning components that connect to the tuning connector  1416 . 
     The second housing segment  112   b  may in some cases include an alternative ground, feed, and/or tuning connector (e.g., the feed/tuning connector  1436 ). These alternative connectors may be coupled to the same flex circuit as the other ground, feed, and tuning connectors  1408 ,  1412 ,  1416 , but may be positioned closer to the first housing segment  112   a  than the other ground, feed, and tuning connectors  1408 ,  1412 ,  1416 . an additional tuning connector  1438  on the sixth housing segment  112   f , which may take the form of the boss protrusion  824  described with reference to  FIG.  8 A . The tuning connector  1438  may be coupled to the flex circuit described with reference to  FIG.  17 A , which flex circuit may carry tuning components such as a circuit including a switch that may be operated to connect or disconnect the slot antenna feature  302   b  (see,  FIG.  14 A ) defined between the sixth housing segment  112   f  and the support plate  110  to the second housing segment  112   b.    
       FIG.  14 C  shows an exterior isometric view of the second housing segment  112   b . A number of ports  1440  (through holes) may be formed in the second housing segment  112   b . The ports may include ports such as an ambient pressure sensing port  1440   a  (e.g., a barometric pressure sensing port) of the device, a second one or more ports  1440   b  that function as speaker or microphone ports, and a power port  1440   c  for receiving a power cord. Other ports may also be provided, or some of the ports  1440  shown may be repurposed. For example, the second housing segment  112   b  may include an audio jack, video port, or audio/visual (A/V) port. In some embodiments, one or more of the ports  1440  shown may not be provided or have a different shape. By way of example, all of the ports  1440  but the power port  1440   c  are shown to have a round shape along the exterior surface of the second housing segment  112   b . The power port  1440   c  is shown to be oblong.  FIG.  14 C  shows four speaker ports  1440   b  disposed to the left of the power port  1440   c  and six speaker ports  1440   b  disposed to the right of the power port  1440   c . Alternatively, the same number of speaker ports  1440   b  may be provided on either side of the power port  1440   c , or a different number of speaker ports  1440   b  may be provided. 
       FIG.  14 D  shows an interior isometric view of the second housing segment  112   b . As shown, walls  1442 ,  1444 ,  1446  may surround individual ones or sets of some of the ports  1440  formed in the second housing segment  112   b . The walls  1442 ,  1444 ,  1446  may extend inward from the second housing segment  112   b  and provide a set of surfaces that may function as sealing surfaces. For example, gaskets or other components may be mated to a first sealing surface  1448  formed around the speaker ports  1440   b  located to the left of the power port  1440   c , and to a second sealing surface  1450  formed around the speaker ports  1440   b  and ambient pressure sensing port  1440   a  located to the right of the power port  1440   c . In some embodiments, portions  1452 ,  1454  of the second housing segment  112   b  may be removed to alter (e.g., reduce) the capacitance between the second housing segment  112   b  and other conductive structures in the chin area. For example, portions  1452 ,  1454  of the second housing segment  112   b  (e.g., portions  1452 ,  1454  on either side of the power port  1440   c ) may be removed to reduce the capacitance between the second housing segment  112   b  and a grounded element attached to a cover fitted to the housing segments  112  that form the sidewall  114 . When portions  1452 ,  1454  of the upper surface of the second housing segment  112   b  are removed, other portions  1456 ,  1458  may remain to provide a support surface for the cover and retain the structural and sealing surface integrity of the second housing segment  112   b.    
       FIG.  14 E  shows the second housing segment  112   b  from the same angle as  FIG.  14 D , but additionally provides an example of how a conductive housing component (e.g., conductive housing components  528  and  116   e ) may be disposed around the sealing surfaces  1448 ,  1450  described with reference to  FIG.  14 D . In some embodiments, the same non-conductive housing component  528  used to structurally couple adjacent interlock features of adjacent housing segments  112  may also be disposed around the walls  1442 ,  1444 ,  1446  that provide the sealing surfaces  1448 ,  1450 . 
       FIG.  14 F  shows a cross-section of the second housing segment  112   b , taken through one of the ports (e.g.,  1440   a  or  1440   b ) disposed to the right of the power port  1440   c  in  FIG.  14 E .  FIG.  14 G  shows a cross-section of the second housing segment  112   b  taken through one of the ports  1440   b  disposed to the left of the power port  1440   c  in  FIG.  14 E . As shown in  FIG.  14 F , a portion of the ambient pressure sensing port  1440   a  (and similarly, all of the ports  1440  to the right of the power port  1440   c  in  FIG.  14 E ) may have an inner surface  1476  or bore that extends toward a rear cover  106   b  of a device as the inner surface  1476  extends into the device. The upper wall  1460  of the port  1440   a  (i.e., that portion of the wall that faces the front cover of the device) may also extend toward the rear cover  106   b  as the upper wall  1460  extends into the device. The angled port  1440   a , and in particular the angled upper wall  1460  of the port  1440   a , may help to further reduce the capacitance between the second housing segment  112   b  and a conductive element attached to a front cover supported by the second housing segment  112   a . The ambient pressure sensing port  1440   a  (and other ports  1440 ) may be angled downward (i.e., toward the rear cover  106   b ) at an angle that balances capacitance reduction with access to the port  1440   a  (e.g., assuming that one or more components need to be inserted into the port  1440   a  from interior to the device). In some embodiments, the sealing surface  1450  around the inner inlet to the port  1440   a  may extend perpendicular to an inner surface of the rear cover  106   b.    
     In some embodiments, the entirety of a port  1440  may be angled toward the rear cover  106   b . In other embodiments, and as shown in  FIGS.  14 F &amp;  14 G , only a portion of a port  1440  may be angled toward the rear cover  106   b . In some cases, a port  1440  may be formed as a result of multiple drilling or end-milling operations. For example, the port shown in  FIG.  14 F  may be formed by drilling a first hole  1462  perpendicular to the sidewall  114 , from outside the sidewall  114 . A second hole  1464  may be drilled perpendicular to the sidewall  114  from inside the sidewall  114 . The first and second holes  1462 ,  1464  may be offset, and may or may not intersect. A third hole  1466  may be drilled from inside the sidewall  114 , at an angle between perpendicular and parallel to the first and second holes  1462 ,  1464 . In some embodiments, the third hole  1466  may be drilled at an angle of about 30 degrees (±10%) with reference to the first and second holes  1462 ,  1464 . The third hole  1466  may intersect both the first hole  1462  and the second hole  1464 , but may not extend through to the exterior surface of the second housing segment  112   b . In alternative embodiments, the third hole  1466  may be drilled at an angle of between 15 degrees and 45 degrees, or at another angle. 
     As shown in  FIG.  14 G , a portion of a speaker port  1440   b  (and similarly, all of the ports  1440  to the left of the power port  1440   c  in  FIG.  14 E ) may have an inner surface  1478  or bore that extends toward a rear cover  106   b  of a device as the inner surface  1478  extends into the device. The upper wall  1480  of the port  1440   b  may also extend toward the rear cover  106   b  as the upper wall  1480  extends into the device. In general, the speaker port  1440   b  may be angled similarly to the ambient pressure sensing port  1440   a  described with reference to  FIG.  14 F . However, in contrast to the sealing surface  1450  around the inner inlet of the ambient pressure sensing port  1440   a , the sealing surface  1448  around the speaker port  1440   b  may be sloped with respect to the rear cover  106   b  of the device. The configuration shown in  FIG.  14 G  may also reduce the capacitance between the second housing segment  112   b  and other conductive structures in the chin area. The slope of the sealing surface  1448  may be sloped to different degrees, or not sloped, to balance capacitance reduction and maintenance of structural rigidity (e.g., the port cross-section shown in  FIG.  14 F  may have greater structural rigidity than the port cross-section shown in  FIG.  14 G , but the port cross-section shown in  FIG.  14 G  may provide further capacitance reduction over the port cross-section shown in  FIG.  14 F ). 
     In some embodiments, the port shown in  FIG.  14 G  may be formed by drilling a first hole  1468  perpendicular to the sidewall  114 , from outside the sidewall  114 . A second hole  1470  may be drilled perpendicular to the sidewall  114  from inside the sidewall  114 . The first and second holes  1468 ,  1470  may be offset, and may or may not intersect. A third hole  1472  may be drilled from inside the sidewall  114 , at an angle between perpendicular and parallel to the first and second holes  1468 ,  1470 . In some embodiments, the third hole  1472  may be drilled at an angle of about 30 degrees (±10%) with reference to the first and second holes  1468 ,  1470 . The third hole  1472  may intersect both the first hole  1468  and the second hole  1470 , but may not extend through to the exterior surface of the second housing segment  112   b . In alternative embodiments, the third hole  1472  may be drilled at an angle of between 15 degrees and 45 degrees, or at another angle. 
     In each of  FIGS.  14 F &amp;  14 G , a non-conductive housing component  528  extends along an inner, upper surface of the sidewall  114  and forms a ledge  1482  and border  1484  that may support and surround a display (e.g., the display  104  described with reference to  FIGS.  1 A- 1 C ). The portions of the non-conductive housing component  528  that extend along the inner, upper surface of the sidewall  114  (e.g., border  1484 ) can help absorb crushing loads on the sidewall  114  and/or transfer crushing loads upward along the sidewall—away from a display. 
     Referring now to  FIGS.  15 A- 15 C , there are shown example areas  1500 ,  1502 ,  1504 ,  1506  where the fifth and sixth housing segments  112   e ,  112   f  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A- 3 C,  4 ,  5 A,  5 B,  6 A,  6 C,  7 A,  7 C,  8 A , &amp;  8 B may be structurally coupled to the support plate  110  described with reference to  FIGS.  4 ,  13 A , &amp;  14 A. As shown in  FIG.  15 A , the fifth housing segment  115   e  may be structurally and electrically coupled to the support plate  110  by a pair of welds at areas  1500 ,  1502  along the left edge of the support plate  110 , and the sixth housing segment  112   f  may be structurally and electrically coupled to the support plate  110  by a pair of welds at areas  1504 ,  1506  along the right edge of the support plate  110 . In some embodiments, the welds may be laser welds. In some embodiments, the welds may be longitudinal welds, as shown. In some embodiments, the longitudinal welds may be replaced by, or supplemented with, spot welds. 
     The fifth housing segment  112   e  may have an aperture in which a button assembly may be mounted, as discussed with reference to  FIG.  6 A . At the end of the fifth housing segment  112   e  adjacent the third housing segment  112   c , there may be little room for a weld and the fifth housing segment  112   e  may be structurally and electrically coupled to the support plate  110  by a clip  1508 . Example cross-sections of the welds and clip  1508  shown in  FIG.  15 A  are shown in  FIGS.  15 B &amp;  15 C  respectively. 
       FIG.  15 B  shows an example cross-section of one of the welds  1510  described with reference to  FIG.  15 A . The weld  1510  may be a weld that directly welds the fifth or sixth housing segment  112   e  or  112   f  to the support plate  110 . In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to a lower surface of the fifth or sixth housing segment  112   e  or  112   f  by an adhesive  534 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   e ,  112   f  and extend parallel to the sidewall  114 . The seal  536  and adhesive  534  may help prevent moisture from entering a device between the housing segments  112   e ,  112   f  and rear cover  106   b.    
       FIG.  15 C  shows an example cross-section of the clip  1508  described with reference to  FIG.  15 A . By way of example, the clip  1508  may be aligned with and surround a threaded hole in the boss protrusion  512  described with reference to  FIG.  5 A , and may be electrically coupled to the fifth housing segment  112   e  by a screw  1512  that is inserted through a hole in the clip  1508  and threaded into the boss protrusion  512 . The screw  1512  may also retain a bracket  1514  for a button assembly and a washer  1516 . The clip  1508  may extend toward the rear cover  106   b  of the device and bend one or more times to extend over a portion of the support plate  110  and over and around a boss protrusion  1518  formed in or mechanically coupled to the support plate  110 . The clip  1508  may be retained to the boss protrusion  1518  by a screw  1520  that is inserted through a hole in the clip  1508  and threaded into the boss protrusion  1518 . A portion of the clip  1508  that extends over the support plate  110  may be welded to the support plate  110  (e.g., by weld  1522 ) to provide extra rigidity for the structural coupling of the fifth housing segment  112   e  to the support plate  110 . 
     In some embodiments, a rear cover (e.g., the rear cover  106   b  described with reference to  FIGS.  1 A- 1 C ) may be bonded to a lower surface of the support plate  110  by an adhesive  1524 . A seal  536  may be inserted into a groove  538  formed in a lower surface of each housing segment  112   e ,  112   f  and extend parallel to the sidewall  114 . The seal  536  and adhesive  1524  may help prevent moisture from entering a device between the housing segments  112   e ,  112   f  and rear cover  106   b.    
       FIGS.  16 A- 16 D  illustrate various example ground connections between the support plate  110  described with reference to  FIGS.  3 A- 3 C,  4 ,  13 A,  14 A , &amp;  15 A and a printed circuit board or logic board  1600 . As shown in  FIG.  16 A , the ground connections may include a first ground connection  1602 , which may be configured as a single ground connection between the support plate  110  and the logic board  1600 ; a second ground connection  1604 , which may be configured as a double ground connection between the support plate  110  and the logic board  1600 ; a third ground connection  1606 , which may be configured as a single Stockholm ground connection between the support plate  110  and the logic board  1600 ; and a fourth ground connection  1608 , which may be configured as a single ground connection between the support plate  110  and the logic board  1600 , and may be coupled to the sixth housing segment  112   f . In some embodiments, the antenna flex circuit described with reference to  FIG.  17 B  may be coupled to each of the second ground connection  1604  and the third ground connection  1606 . The antenna flex circuit described with reference to  FIG.  17 A  may be coupled to first and second ground connections  1610 ,  1612  along the lower part of the sixth housing segment  112   f.    
       FIG.  16 B  shows an example of the single ground connection  1608  between the support plate  110  and the logic board  1600 . As shown, the logic board  1600  may include a single layer  1614  having a hole  1616  that receives a boss protrusion  1618 . The boss protrusion  1618  may be mechanically and electrically coupled to the support plate  110 . The logic board  1600  may abut the periphery of the boss protrusion  1618 . A spacer  1620  may be placed around the boss protrusion  1618  and rest on the logic board  1600 . A screw  1622  may be inserted through a ground connection eye  1624  on the flex circuit shown in  FIG.  17 B  and screwed into a hole  1626  in the boss protrusion  1618 , slightly compressing the ground connection eye  1624  against the spacer  1620 , compressing the spacer  1620  against the logic board  1600 , and compressing the logic board  1600  against the periphery of the boss protrusion  1618 . The single ground connection  1608  may ground conductive traces on the major surfaces  1628 ,  1630  of the logic board  1600  to the support plate  110 . 
       FIG.  16 C  shows an example of the single Stockholm ground connection  1606  between the support plate  110  and the logic board  1600 . As shown, the logic board  1600  may include a first layer  1632  or logic board having a hole  1634  that receives a boss protrusion  1636 . The boss protrusion  1636  may be mechanically and electrically coupled to the support plate  110 . The first layer  1632  or logic board may abut the periphery of the boss protrusion  1636  and have a dielectric  1638  on its lower surface, and a layer  1640  (e.g., a conductive layer or a dielectric layer) on its upper surface. The dielectric  1638  may electrically insulate the first layer  1632  or logic board from the support plate  110 . A logic board interposer  1642  (e.g., a conductive or dielectric interposer) may be placed around the boss protrusion  1636  and rest on the layer  1640  on the upper surface of the first layer  1632  or logic board. The logic board  1600  may further include a second layer  1644  or logic board having a hole  1646  aligned with the boss protrusion  1636 . The second layer  1644  or logic board may have a layer  1648  (e.g., a conductive or dielectric layer) on its lower surface. The layer  1648  may rest on the logic board interposer  1642 . A screw  1650  may be inserted through aligned holes in the second layer  1644  or logic board, the logic board interposer  1642 , and the first layer  1632  or logic board, and may be screwed into a hole  1652  in the boss protrusion  1636 , slightly compressing the first layer  1632  or logic board against the logic board interposer  1642 , compressing the logic board interposer  1642  against the first layer  1632  or logic board, and compressing the first layer  1632  or logic board against the periphery of the boss protrusion  1636 . The Stockholm ground connector  1606  may ground conductive traces  1654  (e.g., copper traces) on the upper surface of the second layer  1644  or logic board to the support plate  110 , but electrically insulate the first layer  1632  or logic board from the support plate  110  (or only electrically connect the first layer  1632  or logic board to ground through the logic board interposer  1642  and second layer  1644  or logic board). 
       FIG.  16 D  shows an example of the double ground connection  1604  between the support plate  110  and the logic board  1600 . As shown, the logic board  1600  may include a first layer  1656  or logic board having a hole  1658  that receives a boss protrusion  1660 . The boss protrusion  1660  may be mechanically and electrically coupled to the support plate  110 . The first layer  1656  or logic board may abut the periphery of the boss protrusion  1660 . A logic board interposer  1662  may be placed around the boss protrusion  1660  and rest on the first layer  1656  or logic board. The logic board  1600  may further include a second layer  1664  or logic board that rests on the logic board interposer  1662  and has a hole  1666  aligned with the boss protrusion  1660 . A screw  1668  may be inserted through a ground connection eye  1670  on the flex circuit shown in  FIG.  17 B  and through aligned holes in the second layer  1664  or logic board, the logic board interposer  1662 , and the first layer  1656  or logic board, and may be screwed into a hole  1672  in the boss protrusion  1660 , slightly compressing the ground connection eye  1670  against the second layer  1664  or logic board (with other conductive components  1674  sometimes forming part of a conductive path between the ground connection eye  1670  and the second layer  1664  or logic board), compressing the second layer  1664  or logic board against the logic board interposer  1662 , compressing the logic board interposer  1662  against the first layer  1656  or logic board, and compressing the first layer  1656  or logic board against the periphery of the boss protrusion  1660 . The double ground connection  1604  may ground each of the first layer  1656  or logic board and the second layer  1664  or logic board to the support plate  110 . 
       FIGS.  17 A &amp;  17 B  show examples of flex circuits  1700 ,  1750  that may be coupled to various ones of the housing segments  112  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  5 A- 10 C,  13 A- 13 D,  14 A- 14 G , &amp;  15 A- 15 C. The flex circuits  1700 ,  1750  may connect to the ground, feed, and tuning connectors of the housing segments  112 , and may propagate signals to/from the ground, feed, and tuning connectors to operate the housing segments  112  as antennas. The flex circuit  1700  shown in  FIG.  17 A  may include a ground connector  1702 , feed connector  1704 , and tuning connector  1706  that may be respectively electrically coupled to the ground connector  1406 , feed connector  1410 , and tuning connector  1414  of the first housing segment  112   a , as described with reference to  FIG.  14 B . The flex circuit  1700  may also include tuning components  1708  that may be electrically coupled to the tuning connector  1706 , feed connector  1704 , and/or ground connector  1702 . 
     The flex circuit  1700  may also include ground connectors  1710 ,  1712 , feed connectors  1714 , and tuning connectors  1716 ,  1718 ,  1720  that may be respectively electrically coupled to the ground connectors  1408 ,  1430 , feed connectors  1412 , and tuning connectors  1438 ,  1416 ,  1436  of the second housing segment  112   b , as described with reference to  FIG.  14 B . The flex circuit  1700  may also include tuning components  1722  that may be electrically coupled to the tuning connectors  1716 ,  1718 ,  1720 , feed connectors  1714 , and/or ground connectors  1710 ,  1712 . 
     The flex circuit  1700  may further include one or more ground connectors  1724 ,  1726  that may be electrically coupled to the sixth housing segment  112   f  described with reference to other figures, or one or more ground connectors  1728 ,  1730  that may be electrically coupled to the support plate  110  described with reference to other figures, and/or a board-to-board (B2B) connector  1732  that may electrically couple the flex circuit  1700 , its connectors, and its tuning components to the logic board  1600  described with reference to  FIGS.  16 A- 16 D . As shown, some portions of the flex circuit  1700  may be bent and routed orthogonal to other portions of the flex circuit  1700  within a device. 
     The flex circuit  1750  shown in  FIG.  17 B  may include a ground connector  1752 , feed connector  1754 , and tuning connector  1756  that may be respectively electrically coupled to the ground connector  1320 , feed connector  1322 , and tuning connector  1324  of the third housing segment  112   c , as described with reference to  FIG.  13 C . The flex circuit  1750  may also include tuning components  1758 ,  1760  that may be electrically coupled to the tuning connector  1756 , feed connector  1754 , and/or ground connector  1752 . 
     The flex circuit  1750  may also include a ground connector  1762 , feed connector  1764 , and tuning connector  1766  that may be respectively electrically coupled to the ground connector  1334 , feed connector  1336 , and tuning connector  1338  of the fourth housing segment  112   d , as described with reference to  FIG.  13 C . The flex circuit  1750  may also include tuning components  1768  that may be electrically coupled to the tuning connector  1766 , feed connector  1764 , and/or ground connector  1762 . 
     The flex circuit  1750  may further include one or more ground connectors  1770 ,  1772 ,  1774 ,  1776  that may be electrically coupled to the support plate  110  described with reference to other figures, a ground spring  1778  that may be electrically coupled to the ground pad  1314  described with reference to  FIG.  13 B , and/or one or more B2B connectors  1780 ,  1782  that may electrically couple the flex circuit  1750 , its connectors, and its tuning components to the logic board  1600  described with reference to  FIGS.  16 A- 16 D . The flex circuit  1750  may further include a Fargo feed connector  1784  and a Fargo logic board connector  1786 . The Fargo feed connector  1784  may be electrically connected to the Fargo feed connector  1346  described with reference to  FIG.  13 C , and the Fargo logic board connector  1786  may be electrically connected to the Stockholm ground connector  1606  described with reference to  FIG.  16 A . The Fargo connectors  1784 ,  1786  may be used to establish a near-field communication (NFC) inductive loop usable for NFC communications. 
     As shown in  FIG.  17 B , some portions of the flex circuit  1750  may be bent and routed orthogonal to other portions of the flex circuit  1750  within a device. 
       FIG.  18    shows how the flex circuits  1700 ,  1750  described with reference to  FIGS.  17 A &amp;  17 B  may be placed and routed with respect to the housing segments  112  and support plate  110  described with reference to  FIGS.  1 A- 1 C,  2 A,  3 A,  4 ,  5 A- 10 C,  13 A- 13 D,  14 A- 14 G,  15 A- 15 C , &amp;  16 A- 16 D. As shown, a portion of the flex circuit  1750  described with reference to  FIG.  17 B  may be oriented perpendicular to the support plate  110  and routed through the channel  1318  between the camera brace  402  and sixth housing segment  112   f . In some embodiments, portions of the flex circuits  1700 ,  1750  may be adhesively bonded to the support plate  110 . 
     Turning now to  FIG.  19   , there is shown a set of wireless frequency bands  1900 ,  1902 ,  1904 ,  1906 ,  1908  that may be used for wireless communication. The wireless frequency bands include a low wireless frequency band  1900  extending from about 600-950 MHz, a mid wireless frequency band  1902  extending from about 1700-2200 MHz, a high wireless frequency band  1904  extending from about 2300-2800 MHz, a B42 wireless frequency band  1906  extending from about 3400-3600 MHz (currently defined for use in the European Union (EU) and Japan), and a 5G, Wi-Fi, or B46 band  1908  extending from about 5000-6000 MHz. 
     In some embodiments of the devices and housings described herein, multiple housing segments disposed along a sidewall of a device housing may be operated individually or simultaneously as antennas, in the wireless frequency bands described with reference to  FIG.  19    or in other wireless frequency bands. For example, in some cases, wireless communication circuitry may be operable to communicate in different wireless communication modes, using the same or different combinations of antennas (including, in some cases, housing segments that are configured to operate as antennas). 
     In some embodiments, wireless communication circuitry may be configured to operate in a first wireless communication mode (e.g., a 2×2 MIMO wireless communication mode). In the first wireless communication mode, the wireless communication circuitry may be configured to use the second and third housing segments  112   b ,  112   c  described with reference to  FIG.  2 A or  3 A  as different antennas for wireless communication. In some embodiments, wireless communication in the first wireless communication mode may occur in the low wireless frequency band  1900 . Alternatively, the wireless communication circuitry may be operated in a second wireless communication mode (e.g., a 4×4 MIMO wireless communication mode). In the second wireless communication mode, the wireless communication circuitry may be configured to use the first, second, third, and fourth housing segments  112   a ,  112   b ,  112   c ,  112   d  described with reference to  FIG.  2 A or  3 A  as different antennas for wireless communication. In some embodiments, wireless communication in the second wireless communication mode may occur in the mid wireless frequency band  1902  or the high wireless frequency band  1904 . Alternatively, the wireless communication circuitry may be operated in a third wireless communication mode (e.g., another 4×4 MIMO wireless communication mode). In the third wireless communication mode, the wireless communication circuitry may be configured to use the second housing segment  112   b  in combination with the sixth housing segment  112   f , a first interior antenna  324  (described with reference to  FIG.  3 A ), a second interior antenna  326  (described with reference to  FIG.  3 A ), and the fourth housing segment  112   d  in combination with the sixth housing segment  112   f  as different antennas for wireless communication. In some embodiments, wireless communication in the third wireless communication mode may occur in the B42 wireless frequency band  1906 . Alternatively, the wireless communication circuitry may be operated in a fourth wireless communication mode (e.g., another 2×2 MIMO wireless communication mode). In the fourth wireless communication mode, the wireless communication circuitry may be configured to use the first and second interior antennas  324   a ,  324   b  described with reference to  FIG.  3 A  for wireless communication in the 5G, Wi-Fi, or B46 wireless frequency band  1908 . 
     In general, it can be useful to configure antennas with the greatest physical separation to operate simultaneously in a wireless communication mode that requires two antennas. Thus, two-antenna wireless communication modes may be supported by antennas positioned on diagonally opposite corners of a device, when possible. 
     The housing segments described with reference to  FIGS.  2 B- 2 E  may also be used in different combinations (or individually) to communicate in one or more of the wireless frequency bands described with reference to  FIG.  19   . 
       FIGS.  20 A &amp;  20 B  show corresponding ground springs  2000 ,  2002 ,  2004 ,  2006 ,  2008 ,  2010 ,  2012 ,  2014 ,  2016 ,  2018  and ground pads  2028 ,  2030 ,  2032 ,  2034 ,  2036 ,  2038 ,  2040 ,  2042 ,  2044 ,  2046  on the housing  102  (e.g., on the housing segments  112  or support plate  110 ), and a cover (e.g., the front cover  106   a  described with reference to  FIGS.  1 A- 1 C ) mounted to the housing  102 , to enclose a device stack including a display. The display may be viewable through the cover  106   a .  FIG.  20 A  shows example locations of ground springs  2000 - 2018  that are electrically coupled to the housing  102 , and  FIG.  20 B  shows example locations of ground pads  2028 - 2046  that are coupled to the cover  106   a.    
     The ground springs  2000 - 2018  and ground pads  2028 - 2046  may be positioned about the periphery of the support plate  110  or cover  106   a , and may be generally located in the device forehead and device chin. A ground spring  2000 - 2018  that is mechanically and electrically coupled to the support plate  110 , a housing segment  112 , or the camera brace  402  may electrically contact a respective ground pad  2028 - 2046  that is mechanically coupled to the cover, and vice versa. Distribution of the ground springs  2000 - 2018  and ground pads  2028 - 2046  throughout the device forehead and chin can provide a good ground reference for the housing segments  112  when the housing segments are configured to operate as antennas. The ground springs and ground pads may in some cases be configured to provide low inductance connections between a ground plane on the cover  106   a  and a ground plane provided by the support plate  110 . In some embodiments, providing relatively equal spacing between ground springs in the device forehead and device chin can provide a more uniform ground. A uniform ground can improve the resonance of the housing segments  112 . 
     The ground springs  2000 - 2018  may be mechanically and electrically coupled to the support plate  110 , housing segments  112 , or camera brace  402  by welds, solder, conductive adhesive, or other types of fasteners. In some embodiments, one or more of the ground springs  2000 - 2018  may be a preformed, stamped, or bent metal spring. In some embodiments, the ground springs  2000 - 2018  and ground pads  2028 - 2046  may be gold or gold plated. 
     Corresponding mechanical snaps  2020 ,  2022 ,  2024 ,  2026 ,  2048 ,  2050 ,  2052 ,  2054  may be coupled to the housing  102  (e.g., to the fifth and sixth housing segments  112   e ,  112   f  or portions of the support plate  110  adjacent the fifth and sixth housing segments  112   e ,  112   f ) and to the cover  106   a , and may engage one another to mechanically couple the cover  106   a  to the housing segments  112 . 
       FIGS.  21 A- 21 C  show various examples of low force springs and corresponding contact pads, as may be used to implement any of the ground springs and ground pads described with reference to  FIGS.  20 A,  20 B , or other figures. The examples of low force springs include a wiping contact  2100  ( FIG.  22 A ), a point contact  2104  ( FIG.  22 B ), and a magsafe pin  2108  ( FIG.  22 C ). Each of the low force springs  2100 ,  2104 ,  2108  may contact a respective contact pad  2102 ,  2106 , or  2110 . In some embodiments, each of the low force springs  2100 ,  2104 ,  2108  and their corresponding contact pads  2102 ,  2106 ,  2110  may be made of gold or be gold plated. 
       FIG.  22    shows a cross-section  2200  of the device forehead shown in  FIGS.  13 C &amp;  13 D . As shown, a portion of a non-conductive housing component  528  may be molded against the third housing segment  112   c  to form a surface  2202  that supports a front cover  106   a . The third housing segment  112   c  may also form part of the surface  2202 , or alternatively, the third housing segment  112   c  may form the entire surface  2202 . A frame  2204  may be positioned about the periphery of the device, between the surface  2202  and the cover  106   a . In some embodiments, the frame  2204  may be bonded to the surface  2202  and/or cover  106   a  by one or more adhesives  2206 ,  2208 . 
     In some embodiments, the frame  2204  may include a plastic outer portion  2204   a  that is mechanically coupled to a metallic inner portion  2204   b  (e.g., the metallic inner portion  2204   b  may be insert-molded into the plastic outer portion  2204   a ). In other embodiments, the entire frame  2204  may be plastic or metallic. As shown, the frame  2204  (e.g., the inner portion  2204   b  of the frame  2204 ) may be attached to a stiffener  2210 , which may be metallic or plastic, for example. The stiffener  2210  may be bonded to the cover  106   a , for example, by an adhesive  2212 . 
     A bracket, such as the alignment bracket  2214 , may be attached to the stiffener  2210 , and in some cases to the cover  106   a . The alignment bracket  2214  may be metallic or plastic, and in some cases may be welded (e.g., laser welded) or bonded (e.g., adhesively bonded) to the stiffener  2210  and/or cover  106   a . The alignment bracket  2214  may serve as a means for mounting a bio-authentication sensor, camera, speaker, or other components within the device forehead. 
     The alignment bracket  2214  may be positioned adjacent a device stack  130  including a display, touch sensors, force sensors, or other components. 
       FIG.  23    shows a sample electrical block diagram of an electronic device  2300 , which electronic device may in some cases take the form of the device  100  described with reference to  FIGS.  1 A- 1 C  or other devices described herein. The electronic device  2300  may include a display  2302  (e.g., a light-emitting display), a processor  2304 , a power source  2306 , a memory  2308  or storage device, a sensor system  2310 , or an input/output (I/O) mechanism  2312  (e.g., an input/output device, input/output port, or haptic input/output interface). The processor  2304  may control some or all of the operations of the electronic device  2300 . The processor  2304  may communicate, either directly or indirectly, with some or all of the other components of the electronic device  2300 . For example, a system bus or other communication mechanism  2314  can provide communication between the display  2302 , the processor  2304 , the power source  2306 , the memory  2308 , the sensor system  2310 , and the I/O mechanism  2312 . 
     The processor  2304  may be implemented as any electronic device capable of processing, receiving, or transmitting data or instructions, whether such data or instructions is in the form of software or firmware or otherwise encoded. For example, the processor  2304  may include a microprocessor, a central processing unit (CPU), an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a controller, or a combination of such devices. As described herein, the term “processor” is meant to encompass a single processor or processing unit, multiple processors, multiple processing units, or other suitably configured computing element or elements. In some embodiments, the processor  2304  may function as the controller described with reference to  FIG.  1 C . 
     It should be noted that the components of the electronic device  2300  can be controlled by multiple processors. For example, select components of the electronic device  2300  (e.g., the sensor system  2310 ) may be controlled by a first processor and other components of the electronic device  2300  (e.g., the display  2302 ) may be controlled by a second processor, where the first and second processors may or may not be in communication with each other. 
     The power source  2306  can be implemented with any device capable of providing energy to the electronic device  2300 . For example, the power source  2306  may include one or more batteries or rechargeable batteries. Additionally or alternatively, the power source  2306  may include a power connector or power cord that connects the electronic device  2300  to another power source, such as a wall outlet. 
     The memory  2308  may store electronic data that can be used by the electronic device  2300 . For example, the memory  2308  may store electrical data or content such as, for example, audio and video files, documents and applications, device settings and user preferences, timing signals, control signals, and data structures or databases. The memory  2308  may include any type of memory. By way of example only, the memory  2308  may include random access memory, read-only memory, Flash memory, removable memory, other types of storage elements, or combinations of such memory types. 
     The electronic device  2300  may also include one or more sensor systems  2310  positioned almost anywhere on the electronic device  2300 . The sensor system(s)  2310  may sense one or more type of parameters, such as but not limited to, force or pressure on the display  2302 , a crown, a button, or a housing of the electronic device  2300 ; light; touch; heat; movement; relative motion; biometric data (e.g., biological parameters) of a user; and so on. For example, the sensor system(s)  2310  may include a watch crown sensor system, a heat sensor, a position sensor, a light or optical sensor, an accelerometer, a pressure transducer, a gyroscope, a magnetometer, a bio-authentication sensor, a health monitoring sensor, and so on. Additionally, the one or more sensor systems  2310  may utilize any suitable sensing technology, including, but not limited to, capacitive, ultrasonic, resistive, optical, ultrasound, piezoelectric, and thermal sensing technology. 
     The I/O mechanism  2312  may transmit or receive data from a user or another electronic device. The I/O mechanism  2312  may include the display  2302 , a touch sensing input surface, one or more buttons (e.g., a graphical user interface “home” button), a crown, one or more cameras, one or more microphones or speakers, one or more ports such as a microphone port, and/or a keyboard. Additionally or alternatively, the I/O mechanism  2312  may transmit electronic signals via a communications interface, such as a wireless, wired, and/or optical communications interface. Examples of wireless and wired communications interfaces include, but are not limited to, cellular and Wi-Fi communications interfaces. In some embodiments, the electronic device  2300  may configure one or more of the housing segments  112  described herein to operate as an antenna and/or may configure the electronic device  2300  to communicate in one or more of the wireless frequency bands described with reference to  FIG.  19    (or other wireless frequency bands). 
     The foregoing description, for purposes of explanation, uses specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art, after reading this description, that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art, after reading this description, that many modifications and variations are possible in view of the above teachings.

Metadata:
Filing Date: 20210921
Publication Date: 20240409
Grant Date: 20240409
Priority Date: 20180830
Inventors: FROESE, KEVIN M.
LEUTHEUSER, PAUL U.
AUCLAIR, MARTIN J.
DURNING, CHRISTOPHER J.
HAM, JUN
BROWNING, LUCY E.
COHEN, SAWYER I.
DINH, RICHARD HUNG MINH
PARR, DONALD J.
Assignee: APPLE INC
CPC Classifications: [{"code": "H05K5/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0283", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0017", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0208", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0217", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04M1/0249", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04M1/026", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0283", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/12", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/42", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q9/42", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q13/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q21/28", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0249", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/026", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q13/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0017", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0283", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0017", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0208", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05K5/0217", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 65324296