PATENT DOCUMENT

Publication Number: US-11114748-B2
Application Number: US-201916563760-A
Country: US
Kind Code: B2

Title: Flexible printed circuit structures for electronic device antennas

Abstract:
An electronic device may have peripheral conductive housing structures divided into first and second segments. First and second antennas may be formed from the segments and may be fed using a flexible printed circuit structure. The structure may include a first substrate attached to the first segment, a second substrate soldered to the first substrate and attached to the second segment, and a third substrate soldered to the second substrate. Third and fourth antennas may be formed on the first substrate whereas fifth and sixth antennas are be formed on the second substrate. The second substrate may be folded and may have a lateral area oriented perpendicular to the third, fourth, fifth, and sixth antennas. Modularly forming the structure in this way may maximize the flexibility with which the structure can accommodate other components, thereby minimizing the space consumption associated with mounting and feeding the antennas without sacrificing wireless performance.

Claims:
What is claimed is: 
     
       1. An electronic device comprising:
 peripheral conductive housing structures; 
 a first antenna having a resonating element arm formed from a segment of the peripheral conductive structures and having an antenna feed coupled to the resonating element arm; 
 a flexible printed circuit substrate coupled to the peripheral conductive housing structures; 
 a radio-frequency transmission line on the flexible printed circuit substrate and coupled to the antenna feed, the radio-frequency transmission line being configured to convey radio-frequency signals for the first antenna; 
 a second antenna on the flexible printed circuit substrate, wherein the second antenna is configured to radiate in a cellular ultra-high band; and 
 a third antenna on the flexible printed circuit substrate, wherein the third antenna is configured to radiate in an ultra-wideband communications band. 
 
     
     
       2. The electronic device defined in  claim 1 , further comprising a first additional flexible printed circuit substrate soldered to the flexible printed circuit substrate. 
     
     
       3. The electronic device defined in  claim 2 , further comprising:
 a fourth antenna having an additional resonating element arm formed from an additional segment of the peripheral conductive housing structures, the additional segment of the peripheral conductive housing structures being separated from the segment of the peripheral conductive housing structures by a dielectric-filled gap, and the fourth antenna having an additional antenna feed coupled to the additional resonating element arm; and 
 an additional radio-frequency transmission line on the first additional flexible printed circuit substrate and coupled to the additional antenna feed, wherein the additional radio-frequency transmission line is configured to convey radio-frequency signals for the fourth antenna. 
 
     
     
       4. The electronic device defined in  claim 3 , further comprising:
 a second additional flexible printed circuit substrate soldered to the first additional flexible printed circuit substrate; 
 a fifth antenna on the second additional flexible printed circuit substrate and configured to radiate in the ultra-wideband communications band; and 
 a sixth antenna on the second additional flexible printed circuit substrate and configured to radiate in the ultra-wideband communications band. 
 
     
     
       5. The electronic device defined in  claim 2 , further comprising:
 a second additional flexible printed circuit substrate soldered to the first additional flexible printed circuit substrate. 
 
     
     
       6. The electronic device defined in  claim 5 , further comprising:
 a fourth antenna on the second additional flexible printed circuit substrate and configured to radiate in the ultra-wideband communications band; and 
 a fifth antenna on the second additional flexible printed circuit substrate and configured to radiate in the ultra-wideband communications band. 
 
     
     
       7. The electronic device defined in  claim 5 , wherein the flexible printed circuit substrate comprises a bend about a first axis, the second additional flexible printed circuit substrate comprises a bend about a second axis, and the first additional flexible printed circuit comprises a bend about a third axis that is perpendicular to the first and second axes. 
     
     
       8. The electronic device defined in  claim 5 , wherein the flexible printed circuit substrate comprises at least three bends, the first additional flexible printed circuit substrate comprises at least two bends, and the second additional flexible printed circuit substrate comprises at least one bend. 
     
     
       9. The electronic device defined in  claim 1 , further comprising:
 a tunable component surface-mounted to the flexible printed circuit substrate and configured to tune the first antenna; and 
 impedance matching circuitry surface-mounted to the flexible printed circuit substrate and configured to tune the second antenna. 
 
     
     
       10. The electronic device defined in  claim 1 , wherein the ultra-wideband communications band comprises a frequency between 6250 MHz and 8250 MHz, the cellular ultra-high band comprising a frequency between 3400 MHz and 3700 MHz. 
     
     
       11. A flexible printed circuit structure configured to convey radio-frequency signals for an antenna external to the flexible printed circuit structure, the flexible printed circuit structure comprising:
 a first flexible printed circuit substrate having first and second antennas; 
 a second flexible printed circuit substrate surface-mounted to the first flexible printed circuit substrate; 
 a radio-frequency transmission line path on the first and second flexible printed circuit substrates that is configured to convey radio-frequency signals for the antenna external to the flexible printed circuit substrate; 
 a third flexible printed circuit substrate surface-mounted to the second flexible printed circuit substrate; and 
 a third antenna on the third flexible printed circuit substrate. 
 
     
     
       12. The flexible printed circuit structure defined in  claim 11 , wherein the first flexible printed circuit substrate comprises a first thinner portion and a first thicker portion that is thicker than the first thinner portion by a first step size and the second flexible printed circuit substrate comprises a second thinner portion and a second thicker portion that is thicker than the second thinner portion by a second step size, the second step size being different from the first step size. 
     
     
       13. The flexible printed circuit structure defined in  claim 11 , further comprising a fourth antenna on the third flexible printed circuit substrate, wherein the first and second flexible printed circuit substrates have first additional radio-frequency transmission line paths that convey radio-frequency signals for the first and second antennas, and the second and third flexible printed circuit substrates have second additional radio-frequency transmission line paths that convey radio-frequency signals for the third and fourth antennas. 
     
     
       14. The flexible printed circuit structure defined in  claim 13 , wherein the second, third, and fourth antennas are configured to form a triplet of antennas that radiate in an ultra-wideband communications band. 
     
     
       15. The flexible printed circuit structure defined in  claim 14 , wherein the first antenna is configured to receive radio-frequency signals in the ultra-wideband communications band and is configured to transmit radio-frequency signals in a non-ultra-wideband communications band. 
     
     
       16. The flexible printed circuit structure defined in  claim 11 , wherein the first flexible printed circuit substrate comprises a first thinner portion and a first thicker portion that is thicker than the first thinner portion by a first step size, the second flexible printed circuit substrate comprises a second thinner portion and a second thicker portion that is thicker than the second thinner portion by a second step size, the third flexible printed circuit substrate comprises a third thinner portion and a third thicker portion that is thicker than the third thinner portion by a third step size, the second step size is different from the first step size, and the third step size is different from the first and second step sizes. 
     
     
       17. The flexible printed circuit structure defined in  claim 11 , wherein the first flexible printed circuit substrate comprises a first bend about a first axis and a second bend about a second axis non-parallel to the first axis, the second flexible printed circuit substrate comprises a third bend about a third axis orthogonal to the first and second axes and a fourth bend about a fourth axis parallel to the third axis, and the third flexible printed circuit substrate comprises a fifth bend about a fifth axis parallel to the first axis. 
     
     
       18. An electronic device comprising:
 peripheral conductive housing structures having a dielectric-filled gap that divides the peripheral conductive housing structures into first and second segments; 
 a first antenna having a first resonating element arm formed from the first segment; 
 a second antenna having a second resonating element arm formed from the second segment; 
 a first flexible printed circuit substrate coupled to the first segment and configured to convey radio-frequency signals for the first antenna; 
 a third antenna on a portion of the first flexible printed circuit substrate; and 
 a second flexible printed circuit substrate coupled to the second segment and configured to convey radio-frequency signals for the second antenna, wherein the second flexible printed circuit substrate has a first portion that is soldered to the first flexible printed circuit substrate, a second portion that is attached to the second segment, and a third portion that extends between the first and second portions, the first, second, and third portions being non-parallel with respect to the portion of the first flexible printed circuit board having the third antenna. 
 
     
     
       19. The electronic device defined in  claim 18 , further comprising:
 a camera module, wherein the camera module is interposed between the first and second portions of the second flexible printed circuit board, the second portion being interposed between the camera module and the second segment. 
 
     
     
       20. The electronic device defined in  claim 19 , further comprising:
 a third flexible printed circuit substrate soldered to the third portion of the second flexible printed circuit substrate; 
 a fourth antenna on the third flexible printed circuit substrate; and 
 a board-to-board connector on the second flexible printed circuit substrate.

Description:
BACKGROUND 
     This relates generally to electronic devices and, more particularly, to electronic devices with wireless communications circuitry. 
     Electronic devices are often provided with wireless communications capabilities. To satisfy consumer demand for small form factor electronic devices, manufacturers are continually striving to implement wireless circuitry such as antennas using compact structures. 
     At the same time, more and more antennas are being used in electronic devices to cover a greater number of communications bands at different frequencies. In practice, it can be difficult to feed radio-frequency signals for multiple antennas in an electronic device with satisfactory isolation, particularly given the size constraints imposed on the electronic device. 
     It would therefore be desirable to be able to provide improved wireless circuitry for electronic devices. 
     SUMMARY 
     An electronic device may be provided with wireless circuitry and peripheral conductive housing structures. A dielectric-filled gap may divide the peripheral conductive housing structures into first and second segments. The wireless circuitry may include a first antenna having a resonating element arm formed from the first segment and a second antenna having a resonating element arm formed from the second segment. 
     The first and second antennas may be fed using a flexible printed circuit structure. The flexible printed circuit structure may include a first flexible printed circuit substrate attached to the first segment, a second flexible printed circuit substrate surface-mounted (e.g., soldered) to the first flexible printed circuit substrate and attached to the second segment, and a third flexible printed circuit substrate surface-mounted to the second flexible printed circuit substrate. A first radio-frequency transmission line path for feeding the first antenna may be formed on the first and second flexible printed circuit substrates. A second radio-frequency transmission line path for feeding the second antenna may be formed on the second flexible printed circuit substrate. A board-to-board connector may be mounted to the second flexible printed circuit substrate. 
     Third and fourth antennas may be formed on the first flexible printed circuit substrate whereas fifth and sixth antennas are be formed on the second flexible printed circuit substrate. Radio-frequency transmission line paths for the third, fourth, fifth, and sixth antennas may be formed on the flexible printed circuit structure. The fourth, fifth, and sixth antennas may form a triplet of antennas that convey radio-frequency signals in an ultra-wideband communications band. The third antenna may receive radio-frequency signals in the ultra-wideband communications band and may transmit and receive radio-frequency signals in a non-ultrawideband communications band. 
     The first flexible printed circuit substrate may include at least three bends about orthogonal axes. The lateral area of the second flexible printed circuit substrate may be oriented perpendicular to the third, fourth, fifth, and sixth antennas. The second flexible printed circuit substrate may include at least two bends about parallel axes. The third flexible printed circuit substrate may include at least one bend about an axis perpendicular to the parallel axes associated with the second flexible printed circuit substrate. The second flexible printed circuit substrate may be wrapped around a camera module or other device components. The first, second, and third flexible printed circuit substrates may each have thinner portions and thicker portions that are thicker than the thinner portions by different respective step sizes. Modularly forming the flexible printed circuit structure in this way may maximize the flexibility with which the flexible printed circuit structure can accommodate other components within the electronic device, thereby minimizing the space consumption associated with mounting and feeding the antennas without sacrificing radio-frequency performance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an illustrative electronic device in accordance with some embodiments. 
         FIG. 2  is a schematic diagram of illustrative circuitry in an electronic device in accordance with some embodiments. 
         FIG. 3  is a schematic diagram of illustrative wireless circuitry in accordance with some embodiments. 
         FIG. 4  is a diagram of an illustrative antenna having an antenna resonating element arm and an antenna ground in accordance with some embodiments. 
         FIG. 5  is a diagram of an illustrative antenna having multiple antenna resonating element arms in accordance with some embodiments. 
         FIG. 6  is a top view showing how an illustrative electronic device may include multiple antennas for covering different communications bands in accordance with some embodiments. 
         FIG. 7  is a side view showing how an illustrative antenna in an electronic device may be pressed against a rear housing wall of the electronic device in accordance with some embodiments. 
         FIG. 8  is a perspective view of an illustrative flexible printed circuit structure that may be used to support and feed antennas of the type shown in  FIGS. 6 and 7  in accordance with some embodiments. 
         FIG. 9  is a cross sectional side view showing how an illustrative flexible printed circuit structure may include different flexible printed circuit substrates with different thicknesses in accordance with some embodiments. 
         FIG. 10  is a flow chart of illustrative steps that may be performed in manufacturing an electronic device having a flexible printed circuit structure of the type shown in  FIGS. 8 and 9  in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Electronic devices such as electronic device  10  of  FIG. 1  may be provided with wireless circuitry (sometimes referred to herein as wireless communications circuitry). The wireless circuitry may be used to support wireless communications in multiple wireless communications bands. Communications bands (sometimes referred to herein as frequency bands) handled by the wireless circuitry can include satellite navigation system communications bands, cellular telephone communications bands, wireless local area network communications bands, near-field communications bands, ultra-wideband communications bands, or other wireless communications bands. 
     The wireless circuitry may include one or more antennas. The antennas of the wireless circuitry can include loop antennas, inverted-F antennas, strip antennas, planar inverted-F antennas, patch antennas, slot antennas, hybrid antennas that include antenna structures of more than one type, or other suitable antennas. Conductive structures for the antennas may, if desired, be formed from conductive electronic device structures. 
     The conductive electronic device structures may include conductive housing structures. The conductive housing structures may include peripheral structures such as peripheral conductive structures that run around the periphery of the electronic device. The peripheral conductive structures may serve as a bezel for a planar structure such as a display, may serve as sidewall structures for a device housing, may have portions that extend upwards from an integral planar rear housing (e.g., to form vertical planar sidewalls or curved sidewalls), and/or may form other housing structures. 
     Gaps may be formed in the peripheral conductive structures that divide the peripheral conductive structures into peripheral segments. One or more of the segments may be used in forming one or more antennas for electronic device  10 . Antennas may also be formed using an antenna ground plane and/or an antenna resonating element formed from conductive housing structures (e.g., internal and/or external structures, support plate structures, etc.). 
     Electronic device  10  may be a portable electronic device or other suitable electronic device. For example, electronic device  10  may be a laptop computer, a tablet computer, a somewhat smaller device such as a wrist-watch device, pendant device, headphone device, earpiece device, or other wearable or miniature device, a handheld device such as a cellular telephone, a media player, or other small portable device. Device  10  may also be a set-top box, a desktop computer, a display into which a computer or other processing circuitry has been integrated, a display without an integrated computer, a wireless access point, a wireless base station, an electronic device incorporated into a kiosk, building, or vehicle, or other suitable electronic equipment. 
     Device  10  may include a housing such as housing  12 . Housing  12 , which may sometimes be referred to as a case, may be formed of plastic, glass, ceramics, fiber composites, metal (e.g., stainless steel, aluminum, etc.), other suitable materials, or a combination of these materials. In some situations, parts of housing  12  may be formed from dielectric or other low-conductivity material (e.g., glass, ceramic, plastic, sapphire, etc.). In other situations, housing  12  or at least some of the structures that make up housing  12  may be formed from metal elements. 
     Device  10  may, if desired, have a display such as display  14 . Display  14  may be mounted on the front face of device  10 . Display  14  may be a touch screen that incorporates capacitive touch electrodes or may be insensitive to touch. The rear face of housing  12  (i.e., the face of device  10  opposing the front face of device  10 ) may have a substantially planar housing wall such as rear housing wall  12 R (e.g., a planar housing wall). Rear housing wall  12 R may have slots that pass entirely through the rear housing wall and that therefore separate portions of housing  12  from each other. Rear housing wall  12 R may include conductive portions and/or dielectric portions. If desired, rear housing wall  12 R may include a planar metal layer covered by a thin layer or coating of dielectric such as glass, plastic, sapphire, or ceramic. Housing  12  may also have shallow grooves that do not pass entirely through housing  12 . The slots and grooves may be filled with plastic or other dielectric. If desired, portions of housing  12  that have been separated from each other (e.g., by a through slot) may be joined by internal conductive structures (e.g., sheet metal or other metal members that bridge the slot). 
     Housing  12  may include peripheral housing structures such as peripheral structures  12 W. Peripheral structures  12 W and conductive portions of rear housing wall  12 R may sometimes be referred to herein collectively as conductive structures of housing  12 . Peripheral structures  12 W may run around the periphery of device  10  and display  14 . In configurations in which device  10  and display  14  have a rectangular shape with four edges, peripheral structures  12 W may be implemented using peripheral housing structures that have a rectangular ring shape with four corresponding edges and that extend from rear housing wall  12 R to the front face of device  10  (as an example). Peripheral structures  12 W or part of peripheral structures  12 W may serve as a bezel for display  14  (e.g., a cosmetic trim that surrounds all four sides of display  14  and/or that helps hold display  14  to device  10 ) if desired. Peripheral structures  12 W may, if desired, form sidewall structures for device  10  (e.g., by forming a metal band with vertical sidewalls, curved sidewalls, etc.). 
     Peripheral structures  12 W may be formed of a conductive material such as metal and may therefore sometimes be referred to as peripheral conductive housing structures, conductive housing structures, peripheral metal structures, peripheral conductive sidewalls, peripheral conductive sidewall structures, conductive housing sidewalls, peripheral conductive housing sidewalls, sidewalls, sidewall structures, or a peripheral conductive housing member (as examples). Peripheral conductive housing structures  12 W may be formed from a metal such as stainless steel, aluminum, or other suitable materials. One, two, or more than two separate structures may be used in forming peripheral conductive housing structures  12 W. 
     It is not necessary for peripheral conductive housing structures  12 W to have a uniform cross-section. For example, the top portion of peripheral conductive housing structures  12 W may, if desired, have an inwardly protruding lip that helps hold display  14  in place. The bottom portion of peripheral conductive housing structures  12 W may also have an enlarged lip (e.g., in the plane of the rear surface of device  10 ). Peripheral conductive housing structures  12 W may have substantially straight vertical sidewalls, may have sidewalls that are curved, or may have other suitable shapes. In some configurations (e.g., when peripheral conductive housing structures  12 W serve as a bezel for display  14 ), peripheral conductive housing structures  12 W may run around the lip of housing  12  (i.e., peripheral conductive housing structures  12 W may cover only the edge of housing  12  that surrounds display  14  and not the rest of the sidewalls of housing  12 ). 
     Rear housing wall  12 R may lie in a plane that is parallel to display  14 . In configurations for device  10  in which some or all of rear housing wall  12 R is formed from metal, it may be desirable to form parts of peripheral conductive housing structures  12 W as integral portions of the housing structures forming rear housing wall  12 R. For example, rear housing wall  12 R of device  10  may include a planar metal structure and portions of peripheral conductive housing structures  12 W on the sides of housing  12  may be formed as flat or curved vertically extending integral metal portions of the planar metal structure (e.g., housing structures  12 R and  12 W may be formed from a continuous piece of metal in a unibody configuration). Housing structures such as these may, if desired, be machined from a block of metal and/or may include multiple metal pieces that are assembled together to form housing  12 . Rear housing wall  12 R may have one or more, two or more, or three or more portions. Peripheral conductive housing structures  12 W and/or conductive portions of rear housing wall  12 R may form one or more exterior surfaces of device  10  (e.g., surfaces that are visible to a user of device  10 ) and/or may be implemented using internal structures that do not form exterior surfaces of device  10  (e.g., conductive housing structures that are not visible to a user of device  10  such as conductive structures that are covered with layers such as thin cosmetic layers, protective coatings, and/or other coating layers that may include dielectric materials such as glass, ceramic, plastic, or other structures that form the exterior surfaces of device  10  and/or serve to hide peripheral conductive housing structures  12 W and/or conductive portions of rear housing wall  12 R from view of the user). 
     Display  14  may have an array of pixels that form an active area AA that displays images for a user of device  10 . For example, active area AA may include an array of display pixels. The array of pixels may be formed from liquid crystal display (LCD) components, an array of electrophoretic pixels, an array of plasma display pixels, an array of organic light-emitting diode display pixels or other light-emitting diode pixels, an array of electrowetting display pixels, or display pixels based on other display technologies. If desired, active area AA may include touch sensors such as touch sensor capacitive electrodes, force sensors, or other sensors for gathering a user input. 
     Display  14  may have an inactive border region that runs along one or more of the edges of active area AA. Inactive area IA may be free of pixels for displaying images and may overlap circuitry and other internal device structures in housing  12 . To block these structures from view by a user of device  10 , the underside of the display cover layer or other layers in display  14  that overlap inactive area IA may be coated with an opaque masking layer in inactive area IA. The opaque masking layer may have any suitable color. 
     Display  14  may be protected using a display cover layer such as a layer of transparent glass, clear plastic, transparent ceramic, sapphire, or other transparent crystalline material, or other transparent layer(s). The display cover layer may have a planar shape, a convex curved profile, a shape with planar and curved portions, a layout that includes a planar main area surrounded on one or more edges with a portion that is bent out of the plane of the planar main area, or other suitable shapes. The display cover layer may cover the entire front face of device  10 . In another suitable arrangement, the display cover layer may cover substantially all of the front face of device  10  or only a portion of the front face of device  10 . Openings may be formed in the display cover layer. For example, an opening may be formed in the display cover layer to accommodate a button. An opening may also be formed in the display cover layer to accommodate ports such as speaker port  16  or a microphone port. Openings may be formed in housing  12  to form communications ports (e.g., an audio jack port, a digital data port, etc.) and/or audio ports for audio components such as a speaker and/or a microphone if desired. 
     Display  14  may include conductive structures such as an array of capacitive electrodes for a touch sensor, conductive lines for addressing pixels, driver circuits, etc. Housing  12  may include internal conductive structures such as metal frame members and a planar conductive housing member (sometimes referred to as a backplate) that spans the walls of housing  12  (i.e., a substantially rectangular sheet formed from one or more metal parts that is welded or otherwise connected between opposing sides of peripheral conductive structures  12 W). The backplate may form an exterior rear surface of device  10  or may be covered by layers such as thin cosmetic layers, protective coatings, and/or other coatings that may include dielectric materials such as glass, ceramic, plastic, or other structures that form the exterior surfaces of device  10  and/or serve to hide the backplate from view of the user. Device  10  may also include conductive structures such as printed circuit boards, components mounted on printed circuit boards, and other internal conductive structures. These conductive structures, which may be used in forming a ground plane in device  10 , may extend under active area AA of display  14 , for example. 
     In regions  22  and  20 , openings may be formed within the conductive structures of device  10  (e.g., between peripheral conductive housing structures  12 W and opposing conductive ground structures such as conductive portions of rear housing wall  12 R, conductive traces on a printed circuit board, conductive electrical components in display  14 , etc.). These openings, which may sometimes be referred to as gaps, may be filled with air, plastic, and/or other dielectrics and may be used in forming slot antenna resonating elements for one or more antennas in device  10 , if desired. 
     Conductive housing structures and other conductive structures in device  10  may serve as a ground plane for the antennas in device  10 . The openings in regions  22  and  20  may serve as slots in open or closed slot antennas, may serve as a central dielectric region that is surrounded by a conductive path of materials in a loop antenna, may serve as a space that separates an antenna resonating element such as a strip antenna resonating element or an inverted-F antenna resonating element from the ground plane, may contribute to the performance of a parasitic antenna resonating element, or may otherwise serve as part of antenna structures formed in regions  22  and  20 . If desired, the ground plane that is under active area AA of display  14  and/or other metal structures in device  10  may have portions that extend into parts of the ends of device  10  (e.g., the ground may extend towards the dielectric-filled openings in regions  22  and  20 ), thereby narrowing the slots in regions  22  and  20 . 
     In general, device  10  may include any suitable number of antennas (e.g., one or more, two or more, three or more, four or more, etc.). The antennas in device  10  may be located at opposing first and second ends of an elongated device housing (e.g., ends at regions  22  and  20  of device  10  of  FIG. 1 ), along one or more edges of a device housing, in the center of a device housing, in other suitable locations, or in one or more of these locations. The arrangement of  FIG. 1  is merely illustrative. 
     Portions of peripheral conductive housing structures  12 W may be provided with peripheral gap structures. For example, peripheral conductive housing structures  12 W may be provided with one or more gaps such as gaps  18 , as shown in  FIG. 1 . The gaps in peripheral conductive housing structures  12 W may be filled with dielectric such as polymer, ceramic, glass, air, other dielectric materials, or combinations of these materials. Gaps  18  may divide peripheral conductive housing structures  12 W into one or more peripheral conductive segments. There may be, for example, two peripheral conductive segments in peripheral conductive housing structures  12 W (e.g., in an arrangement with two gaps  18 ), three peripheral conductive segments (e.g., in an arrangement with three gaps  18 ), four peripheral conductive segments (e.g., in an arrangement with four gaps  18 ), six peripheral conductive segments (e.g., in an arrangement with six gaps  18 ), etc. The segments of peripheral conductive housing structures  12 W that are formed in this way may form parts of antennas in device  10  if desired. 
     If desired, openings in housing  12  such as grooves that extend partway or completely through housing  12  may extend across the width of the rear wall of housing  12  and may penetrate through the rear wall of housing  12  to divide the rear wall into different portions. These grooves may also extend into peripheral conductive housing structures  12 W and may form antenna slots, gaps  18 , and other structures in device  10 . Polymer or other dielectric may fill these grooves and other housing openings. In some situations, housing openings that form antenna slots and other structure may be filled with a dielectric such as air. 
     In order to provide an end user of device  10  with as large of a display as possible (e.g., to maximize an area of the device used for displaying media, running applications, etc.), it may be desirable to increase the amount of area at the front face of device  10  that is covered by active area AA of display  14 . Increasing the size of active area AA may reduce the size of inactive area IA within device  10 . This may reduce the area behind display  14  that is available for antennas within device  10 . For example, active area AA of display  14  may include conductive structures that serve to block radio-frequency signals handled by antennas mounted behind active area AA from radiating through the front face of device  10 . It would therefore be desirable to be able to provide antennas that occupy a small amount of space within device  10  (e.g., to allow for as large of a display active area AA as possible) while still allowing the antennas to communicate with wireless equipment external to device  10  with satisfactory efficiency bandwidth. 
     In a typical scenario, device  10  may have one or more upper antennas and one or more lower antennas (as an example). An upper antenna may, for example, be formed at the upper end of device  10  in region  20 . A lower antenna may, for example, be formed at the lower end of device  10  in region  22 . Additional antennas may be formed along the edges of housing  12  extending between regions  20  and  22  if desired. The antennas may be used separately to cover identical communications bands, overlapping communications bands, or separate communications bands. The antennas may be used to implement an antenna diversity scheme or a multiple-input-multiple-output (MIMO) antenna scheme. 
     Antennas in device  10  may be used to support any communications bands of interest. For example, device  10  may include antenna structures for supporting local area network communications, voice and data cellular telephone communications, global positioning system (GPS) communications or other satellite navigation system communications, Bluetooth® communications, near-field communications, ultra-wideband communications, etc. 
     A schematic diagram of illustrative components that may be used in device  10  is shown in  FIG. 2 . As shown in  FIG. 2 , device  10  may include control circuitry  28 . Control circuitry  28  may include storage such as storage circuitry  24 . Storage circuitry  24  may include hard disk drive storage, nonvolatile memory (e.g., flash memory or other electrically-programmable-read-only memory configured to form a solid-state drive), volatile memory (e.g., static or dynamic random-access-memory), etc. 
     Control circuitry  28  may include processing circuitry such as processing circuitry  26 . Processing circuitry  26  may be used to control the operation of device  10 . Processing circuitry  26  may include on one or more microprocessors, microcontrollers, digital signal processors, host processors, baseband processor integrated circuits, application specific integrated circuits, central processing units (CPUs), etc. Control circuitry  28  may be configured to perform operations in device  10  using hardware (e.g., dedicated hardware or circuitry), firmware, and/or software. Software code for performing operations in device  10  may be stored on storage circuitry  24  (e.g., storage circuitry  24  may include non-transitory (tangible) computer readable storage media that stores the software code). The software code may sometimes be referred to as program instructions, software, data, instructions, or code. Software code stored on storage circuitry  24  may be executed by processing circuitry  26 . 
     Control circuitry  28  may be used to run software on device  10  such as external node location applications, satellite navigation applications, internet browsing applications, voice-over-internet-protocol (VOIP) telephone call applications, email applications, media playback applications, operating system functions, etc. To support interactions with external equipment, control circuitry  28  may be used in implementing communications protocols. Communications protocols that may be implemented using control circuitry  28  include internet protocols, wireless local area network protocols (e.g., IEEE 802.11 protocols—sometimes referred to as Wi-Fi®), protocols for other short-range wireless communications links such as the Bluetooth® protocol or other wireless personal area network (WPAN) protocols, IEEE 802.11ad protocols, cellular telephone protocols, MIMO protocols, antenna diversity protocols, satellite navigation system protocols (e.g., global positioning system (GPS) protocols, global navigation satellite system (GLONASS) protocols, etc.), IEEE 802.15.4 ultra-wideband communications protocols or other ultra-wideband communications protocols, etc. Each communications protocol may be associated with a corresponding radio access technology (RAT) that specifies the physical connection methodology used in implementing the protocol. 
     Device  10  may include input-output circuitry  30 . Input-output circuitry  30  may include input-output devices  32 . Input-output devices  32  may be used to allow data to be supplied to device  10  and to allow data to be provided from device  10  to external devices. Input-output devices  32  may include user interface devices, data port devices, and other input-output components. For example, input-output devices  32  may include touch screens, displays without touch sensor capabilities, buttons, scrolling wheels, touch pads, key pads, keyboards, microphones, cameras, buttons, speakers, status indicators, light sources, audio jacks and other audio port components, vibrators or other haptic feedback engines, digital data port devices, light sensors (e.g., infrared light sensors, visible light sensors, etc.), light-emitting diodes, motion sensors (accelerometers), capacitance sensors, proximity sensors, magnetic sensors, force sensors (e.g., force sensors coupled to a display to detect pressure applied to the display), etc. 
     Input-output circuitry  30  may include wireless circuitry  34 . To support wireless communications, wireless circuitry  34  may include radio-frequency (RF) transceiver circuitry formed from one or more integrated circuits, power amplifier circuitry, low-noise input amplifiers, passive RF components, one or more antennas such as antennas  40 , transmission lines, and other circuitry for handling RF wireless signals. Wireless signals can also be sent using light (e.g., using infrared communications). 
     While control circuitry  28  is shown separately from wireless circuitry  34  in the example of  FIG. 2  for the sake of clarity, wireless circuitry  34  may include processing circuitry that forms a part of processing circuitry  26  and/or storage circuitry that forms a part of storage circuitry  24  of control circuitry  28  (e.g., portions of control circuitry  28  may be implemented on wireless circuitry  34 ). As an example, control circuitry  28  (e.g., processing circuitry  26 ) may include baseband processor circuitry or other control components that form a part of wireless circuitry  34 . 
     Wireless circuitry  34  may include radio-frequency transceiver circuitry for handling various radio-frequency communications bands. For example, wireless circuitry  34  may include wireless local area network (WLAN) and wireless personal area network (WPAN) transceiver circuitry  38 . Transceiver circuitry  38  may handle 2.4 GHz and 5 GHz bands for WiFi® (IEEE 802.11) communications or other WLAN bands and may handle the 2.4 GHz Bluetooth® communications band or other WPAN bands. Transceiver circuitry  38  may sometimes be referred to herein as WLAN/WPAN transceiver circuitry  38 . 
     Wireless circuitry  34  may use cellular telephone transceiver circuitry  42  for handling wireless communications in frequency ranges (communications bands) such as a cellular low band (LB) from 600 to 960 MHz, a cellular low-midband (LMB) from 1410 to 1510 MHz, a cellular midband (MB) from 1710 to 2170 MHz, a cellular high band (HB) from 2300 to 2700 MHz, a cellular ultra-high band (UHB) from 3300 to 5850 MHz, or other communications bands between 600 MHz and 5850 MHz or other suitable frequencies (as examples). Cellular telephone transceiver circuitry  42  may handle voice data and non-voice data. 
     Wireless circuitry  34  may include satellite navigation system circuitry such as Global Positioning System (GPS) receiver circuitry  36  for receiving GPS signals at 1575 MHz or for handling other satellite positioning data (e.g., GLONASS signals at 1609 MHz). Satellite navigation system signals for receiver circuitry  36  are received from a constellation of satellites orbiting the earth. Wireless circuitry  34  can include circuitry for other short-range and long-range wireless links if desired. For example, wireless circuitry  34  may include circuitry for receiving television and radio signals, paging system transceivers, near field communications (NFC) transceiver circuitry (e.g., an NFC transceiver operating at 13.56 MHz or another suitable frequency), etc. 
     In NFC links, wireless signals are typically conveyed over a few inches at most. In satellite navigation system links, cellular telephone links, and other long-range links, wireless signals are typically used to convey data over thousands of feet or miles. In WLAN and WPAN links at 2.4 and 5 GHz and other short-range wireless links, wireless signals are typically used to convey data over tens or hundreds of feet. Antenna diversity schemes may be used if desired to ensure that the antennas that have become blocked or that are otherwise degraded due to the operating environment of device  10  can be switched out of use and higher-performing antennas used in their place. 
     Wireless circuitry  34  may include ultra-wideband (UWB) transceiver circuitry  44  that supports communications using the IEEE 802.15.4 protocol and/or other ultra-wideband communications protocols. Ultra-wideband radio-frequency signals may be based on an impulse radio signaling scheme that uses band-limited data pulses. Ultra-wideband radio-frequency signals may have any desired bandwidths such as bandwidths between 499 MHz and 1331 MHz, bandwidths greater than 500 MHz, etc. The presence of lower frequencies in the baseband may sometimes allow ultra-wideband radio-frequency signals to penetrate through objects such as walls. In an IEEE 802.15.4 system, a pair of electronic devices may exchange wireless time stamped messages. Time stamps in the messages may be analyzed to determine the time of flight of the messages and thereby determine the distance (range) between the devices and/or an angle between the devices (e.g., an angle of arrival of incoming radio-frequency signals). UWB transceiver circuitry  44  may operate (i.e., convey radio-frequency signals) in frequency bands such as an ultra-wideband communications band between about 5 GHz and about 8.3 GHz (e.g., a 6.5 GHz UWB communications band, an 8 GHz UWB communications band, and/or at other suitable frequencies). 
     As an example, device  10  may convey radio-frequency signals  46  at ultra-wideband frequencies with external wireless equipment  10 ′ to determine a distance between device  10  and external wireless equipment  10 ′ and/or to determine an angle of arrival of radio-frequency signals  46  (e.g., to determine the relative orientation and/or position of external wireless equipment  10 ′ with respect to device  10 ). External wireless equipment  10 ′ may be an electronic device like device  10  or may include any other desired wireless equipment. Radio-frequency signals conveyed by device  10  in an ultra-wideband communications band and using an ultra-wideband communications protocol (e.g., radio-frequency signals  46 ) may sometimes be referred to herein as ultra-wideband signals. Radio-frequency signals conveyed by device  10  in other communications bands (e.g., using communications protocols other than an ultra-wideband communications protocol) may sometimes be referred to here as non-ultra-wideband (non-UWB) signals. Non-UWB signals conveyed by device  10  may include, for example, radio-frequency signals in a cellular telephone communications band, a WLAN communications band, etc. 
     Wireless circuitry  34  may include antennas  40 . Antennas  40  may be formed using any suitable types of antenna structures. For example, antennas  40  may include antennas with resonating elements that are formed from loop antenna structures, patch antenna structures, inverted-F antenna structures, slot antenna structures, planar inverted-F antenna structures, helical antenna structures, dipole antenna structures, monopole antenna structures, hybrids of two or more of these designs, etc. If desired, one or more of antennas  40  may be cavity-backed antennas. 
     Different types of antennas may be used for different bands and combinations of bands. For example, one type of antenna may be used in forming a local wireless link antenna and another type of antenna may be used in forming a remote wireless link antenna. Dedicated antennas may be used for conveying radio-frequency signals in a UWB communications band (e.g., UWB signals) or, if desired, antennas  40  can be configured to convey both radio-frequency signals in a UWB communications band and radio-frequency signals in non-UWB communications bands (e.g., wireless local area network signals and/or cellular telephone signals). Antennas  40  can include two or more antennas for handling ultra-wideband wireless communication. In one suitable arrangement that is described herein as an example, antennas  40  include one or more groups of three antennas (sometimes referred to herein as triplets of antennas) for handling ultra-wideband wireless communication. In yet another suitable arrangement, antennas  40  may include a triplet of sets of antennas, where each set of antenna includes four antennas that are tuned to four respective frequencies (e.g., antennas  40  may include three sets of four antennas for handling ultra-wideband wireless communication). Antennas  40  may include one or more doublets of antennas for handling ultra-wideband wireless communication if desired. 
     Space is often at a premium in electronic devices such as device  10 . In order to minimize space consumption within device  10 , the same antenna  40  may be used to cover multiple communications bands. In one suitable arrangement that is described herein as an example, each antenna  40  that is used to perform ultra-wideband wireless communication may be a multi-band antenna that conveys radio-frequency signals in at least two ultra-wideband communications bands (e.g., the 6.5 GHz UWB communications band and the 8.0 GHz UWB communications band). 
     As shown in  FIG. 3 , wireless circuitry  34  may include transceiver circuitry  60  (e.g., GPS receiver circuitry  36 , WLAN/WPAN circuitry  38 , cellular telephone transceiver circuitry  42 , and/or UWB transceiver circuitry  44  of  FIG. 2 ). Transceiver circuitry  60  may be coupled to antenna structures such as a given antenna  40  using a radio-frequency transmission line path such as radio-frequency transmission line path  50 . Wireless circuitry  34  may be coupled to control circuitry  28 . Control circuitry  28  may be coupled to input-output devices  32 . Input-output devices  32  may supply output from device  10  and may receive input from sources that are external to device  10 . 
     To provide antenna structures such as antenna  40  with the ability to cover communications frequencies of interest, antenna  40  may be provided with circuitry such as filter circuitry (e.g., one or more passive filters and/or one or more tunable filter circuits). Discrete components such as capacitors, inductors, and resistors may be incorporated into the filter circuitry. Capacitive structures, inductive structures, and resistive structures may also be formed from patterned metal structures (e.g., part of an antenna). If desired, antenna  40  may be provided with adjustable circuits such as tunable components  64  to tune the antenna over communications (frequency) bands of interest. Tunable components  64  may be part of a tunable filter or tunable impedance matching network, may be part of an antenna resonating element, may span a gap between an antenna resonating element and antenna ground, etc. 
     Tunable components  64  may include tunable inductors, tunable capacitors, or other tunable components. Tunable components such as these may be based on switches and networks of fixed components, distributed metal structures that produce associated distributed capacitances and inductances, variable solid-state devices for producing variable capacitance and inductance values, tunable filters, or other suitable tunable structures. During operation of device  10 , control circuitry  28  may issue control signals on one or more control paths such as control path  62  that adjust inductance values, capacitance values, or other parameters associated with tunable components  64 , thereby tuning antenna  40  to cover desired communications bands. Antenna tuning components that are used to adjust the frequency response of antenna  40  such as tunable components  64  may sometimes be referred to herein as antenna tuning components, tuning components, antenna tuning elements, tuning elements, adjustable tuning components, adjustable tuning elements, or adjustable components. 
     Radio-frequency transmission line path  50  may include one or more radio-frequency transmission lines. Radio-frequency transmission lines in radio-frequency transmission line path  50  may, for example, include coaxial cable transmission lines, stripline transmission lines, microstrip transmission lines, coaxial probes realized by a metalized vias, edge-coupled microstrip transmission lines, edge-coupled stripline transmission lines, waveguide structures (e.g., coplanar waveguides or grounded coplanar waveguides), combinations of these types of radio-frequency transmission lines and/or other transmission line structures, etc. 
     Radio-frequency transmission line path  50  may have a positive signal conductor such as signal conductor  52  and a ground signal conductor such as ground conductor  54 . The radio-frequency transmission lines in radio-frequency transmission line path  50  may, for example, be integrated into rigid and/or flexible printed circuit boards. In one suitable arrangement, radio-frequency transmission lines in radio-frequency transmission line path  50  may also include transmission line conductors (e.g., signal conductors  52  and ground conductors  54 ) integrated within multilayer laminated structures (e.g., layers of a conductive material such as copper and a dielectric material such as a resin that are laminated together without intervening adhesive). The multilayer laminated structures may, if desired, be folded or bent in multiple dimensions (e.g., two or three dimensions) and may maintain a bent or folded shape after bending (e.g., the multilayer laminated structures may be folded into a particular three-dimensional shape to route around other device components and may be rigid enough to hold its shape after folding without being held in place by stiffeners or other structures). All of the multiple layers of the laminated structures may be batch laminated together (e.g., in a single pressing process) without adhesive (e.g., as opposed to performing multiple pressing processes to laminate multiple layers together with adhesive). 
     A matching network (e.g., an adjustable matching network formed using tunable components  64 ) may include components such as inductors, resistors, and capacitors used in matching the impedance of antenna  40  to the impedance of radio-frequency transmission line path  50 . Matching network components may be provided as discrete components (e.g., surface mount technology components) or may be formed from housing structures, printed circuit board structures, traces on plastic supports, etc. Components such as these may also be used in forming filter circuitry in antenna  40  and may be tunable and/or fixed components. 
     Radio-frequency transmission line path  50  may be coupled to antenna feed structures associated with antenna  40 . As an example, antenna  40  may form an inverted-F antenna, a slot antenna, a monopole antenna, a dipole antenna, or other antenna having an antenna feed  48  with a positive antenna feed terminal such as positive antenna feed terminal  56  and a ground antenna feed terminal such as ground antenna feed terminal  58 . Signal conductor  52  may be coupled to positive antenna feed terminal  56  and ground conductor  54  may be coupled to ground antenna feed terminal  58 . Other types of antenna feed arrangements may be used if desired. For example, antenna  40  may be fed using multiple feeds each coupled to a respective port of radio-frequency transceiver circuitry  60  over a corresponding radio-frequency transmission line path. If desired, signal conductor  52  may be coupled to multiple locations on antenna  40  (e.g., antenna  40  may include multiple positive antenna feed terminals coupled to signal conductor  52  of the same radio-frequency transmission line path  50 ). Switches may be interposed on the signal conductor between radio-frequency transceiver circuitry  60  and the positive antenna feed terminals if desired (e.g., to selectively activate one or more positive antenna feed terminals at any given time). The illustrative feeding configuration of  FIG. 3  is merely illustrative. 
     Control circuitry  28  may use information from a proximity sensor, wireless performance metric data such as received signal strength information, device orientation information from an orientation sensor, device motion data from an accelerometer or other motion detecting sensor, information about a usage scenario of device  10 , information about whether audio is being played through speaker port  16  ( FIG. 1 ), information from one or more antenna impedance sensors, information on desired frequency bands to use for communications, and/or other information in determining when antenna  40  is being affected by the presence of nearby external objects or is otherwise in need of tuning. In response, control circuitry  28  may adjust an adjustable inductor, adjustable capacitor, switch, or other tunable components such as tunable components  64  to ensure that antenna  40  operates as desired. Adjustments to tunable components  64  may also be made to extend the frequency coverage of antenna  40  (e.g., to cover desired communications bands that extend over a range of frequencies larger than antenna  40  would cover without tuning). 
     Antenna  40  may include antenna resonating element structures (sometimes referred to herein as radiating element structures), antenna ground plane structures (sometimes referred to herein as ground plane structures, ground structures, or antenna ground structures), an antenna feed such as antenna feed  48 , and other components (e.g., tunable components  64 ). Antenna  40  may be configured to form any suitable type of antenna. 
       FIG. 4  is a schematic diagram of antenna structures that may be used in forming antenna  40 . As shown in  FIG. 4 , antenna  40  may include an antenna resonating element such as antenna resonating element  68  (e.g., an inverted-F antenna resonating element) and an antenna ground (sometimes referred to herein as a ground plane) such as antenna ground  66 . Antenna resonating element  68  may have a main resonating element arm such as arm  70 . The length of arm  70  may be selected so that antenna  40  resonates at desired operating frequencies (e.g., where the length of arm  70  is approximately equal to one-quarter of the effective wavelength corresponding to a frequency in a communications band handled by antenna  40 ). Antenna resonating element  68  may also exhibit resonances at harmonic frequencies. 
     If desired, other conductive structures in the vicinity of arm  70  may contribute to the radiative response of antenna  40  (e.g., antenna resonating element  68  may include conductive structures that are separate from arm  70  such as conductive portions of other antennas in the vicinity of antenna  40 ). Arm  70  may be separated from antenna ground  66  by a dielectric-filled opening or gap. Antenna ground  66  may be formed from housing structures such as a conductive support plate, conductive portions of display  14  ( FIG. 1 ), conductive traces on a printed circuit board, metal portions of electronic components, or other conductive ground structures. 
     If desired, arm  70  may be coupled to antenna ground  66  by one or more return paths such as return path  73 . Positive antenna feed terminal  56  of antenna feed  48  may be coupled to arm  70 . Ground antenna feed terminal  58  may be coupled to antenna ground  66  (e.g., antenna feed  48  may run parallel to return path  73 ). If desired, antenna resonating element  68  may include one or more tunable components that are coupled between arm  70  and antenna ground  66 . As shown in  FIG. 4 , for example, a tunable component such as tunable component  72  (e.g., a tunable component such as tunable component  64  of  FIG. 3 ) may be coupled between arm  70  and antenna ground  66 . Tunable component  72  may exhibit a capacitance, resistance, and/or inductance that is adjusted in response to control signals  74  provided to tunable component  72  from control circuitry  28  ( FIG. 3 ). If desired, antenna resonating element  68  may include more than one resonating arm to support radiation in multiple communications bands. 
       FIG. 5  is a schematic diagram of antenna  40  in an example where antenna resonating element  68  includes multiple resonating element arms to support radiation in multiple communications bands (e.g., where antenna  40  is a dual band inverted-F antenna). As shown in  FIG. 5 , antenna resonating element  68  may include a first resonating element arm  70 L and a second resonating element arm  70 H extending from opposing sides of return path  73 . 
     The length of first resonating element arm  70 L (sometimes referred to herein as low band arm  70 L) may be selected to radiate in a first frequency band and the length of second resonating element arm  70 H (sometimes referred to herein as high band arm  70 H) may be selected to radiate in a second frequency band at higher frequencies than the first frequency band. As an example, low band arm  70 L may have a length that configures low band arm  70 L to radiate in the 6.5 GHz UWB communications band whereas high band arm  70 H has a length that configures high band arm  70 H to radiate in the 8.0 GHz UWB communications band. 
     Antenna  40  of  FIG. 5  may be fed using two antenna feeds such as antenna feed  48 H and antenna feed  48 L. Antenna feed  48 H may include a positive antenna feed terminal  56 H coupled to high band arm  70 H. Antenna feed  48 L may include a positive antenna feed terminal  56 L coupled to low band arm  70 L. The ground antenna feed terminals of antenna feeds  48 L and  48 H are not shown in the example of  FIG. 5  for the sake of clarity. If desired, antenna feeds  48 L and  48 H may share the same ground antenna feed terminal. Positive antenna feed terminals  56 H and  56 L may both be coupled to the same transmission line (e.g., to the same signal conductor  52  as shown in  FIG. 3 ). This may, for example, optimize antenna efficiency of antenna  40  in both the frequency band covered by low band arm  70 L and the frequency band covered by high band arm  70 H (e.g., because antenna current may be conveyed to each resonating element arm over the corresponding positive antenna feed terminal without first shorting to ground over return path  73 ). 
     In one suitable arrangement that is sometimes described herein as an example, antenna  40  may be a dual-band planar inverted-F antenna. When configured as a dual-band planar inverted-F antenna, resonating element arms  70 H and  70 L may be formed using a substantially planar conductive structure (e.g., a conductive trace or patch, sheet metal, conductive foil, etc.) that extends across a planar lateral area above antenna ground  66 . The examples of  FIGS. 4 and 5  are merely illustrative. Antenna  40  may be formed using any desired antenna structures and may be fed using any desired feeding arrangement. The resonating element arms of antenna  40  (e.g., arm  70  of  FIG. 4  or arms  70 H and  70 L of  FIG. 5 ) may have any desired shape following any desired paths (e.g., paths having curved and/or straight segments, shapes having any desired number of curved and/or straight sides, etc.). Antenna  40  of  FIG. 5  may include one or more tunable components (e.g., tunable component  72  of  FIG. 4 ) if desired. 
     A top interior view of an illustrative portion of device  10  that contains multiple antennas  40  is shown in  FIG. 6  (e.g., at the upper end of device  10  within region  20  of  FIG. 1 ). As shown in  FIG. 6 , device  10  may have peripheral conductive housing structures such as peripheral conductive housing structures  12 W. Peripheral conductive housing structures  12 W may be divided by dielectric-filled peripheral gaps  18  (e.g., plastic gaps) such as gaps  18 - 1 ,  18 - 2 , and  18 - 3 . Gap  18 - 1  may divide peripheral conductive housing structures  12 W into segment  78  and segment  76 . Gap  18 - 2  may separate segment  76  from segment  80  of peripheral conductive housing structures  12 W. Gap  18 - 3  may separate segment  80  from segment  82  of peripheral conductive housing structures  12 W. 
     As shown in  FIG. 6 , device  10  may include at least six antennas  40  such as a first antenna  40 - 1 , a second antenna  40 - 2 , a third antenna  40 - 3 , a fourth antenna  40 - 4 , a fifth antenna  40 - 5 , and a sixth antenna  40 - 6 . Antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  may share ground structures  100 , which form the antenna ground (e.g., antenna ground  66  of  FIGS. 4 and 5 ) for the antennas. Other components such as camera module  104  may be located in the vicinity of one or more antennas such as antenna  40 - 2 . 
     Segments  76  and  80  of peripheral conductive housing structures  12 W may be separated from ground structures  100  by dielectric-filled slot  106 . Air, plastic, ceramic, glass, and/or other dielectric materials may fill slot  106 . In one suitable arrangement, slot  106  may be continuous with gaps  18 - 1 ,  18 - 2 , and  18 - 3 , and a single piece of dielectric material (e.g., plastic) may fill slot  106 , gap  18 - 1 , gap  18 - 2 , and gap  18 - 3 . Dielectric material in slot  106  may lie flush with the exterior surface of device  10  if desired. 
     Antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  may be coupled to transceiver circuitry  60  by corresponding radio-frequency transmission line paths  50 . Transceiver circuitry  60  may be mounted to a substrate such as logic board  102  (e.g., a main logic board for device  10 ). Logic board  102  may include a rigid printed circuit board, a flexible printed circuit, an integrated circuit, an integrated circuit package, and/or any other desired substrates. Filter circuitry, switching circuitry, or any other desired radio-frequency circuitry (not shown in  FIG. 6  for the sake of clarity) may be interposed on radio-frequency transmission line paths  50  between transceiver circuitry  60  and the antennas in device  10 . 
     Antenna  40 - 1  may have an antenna resonating element  68 - 1  that includes one or more antenna resonating element arms (e.g., arm  70  of  FIG. 4  or arms  70 H and  70 L of  FIG. 5 ) formed from segment  76  of peripheral conductive housing structures  12 W. The length of segment  76  may be selected to provide antenna  40 - 1  with response peaks in one or more communications bands. Antenna  40 - 1  may have an antenna feed  48 - 1  with a positive antenna feed terminal  56 - 1  coupled to segment  76  and a ground antenna feed terminal  58 - 1  coupled to ground structures  100 . The length of segment  76  from antenna feed  48 - 1  to gap  18 - 1  and/or the length of segment  76  from antenna feed  48 - 1  to gap  18 - 2  may, for example, be approximately equal to one-quarter of an effective wavelength of operation of antenna  40 - 2  (e.g., where the effective wavelength is equal to the free space wavelength modified by a constant value determined by the dielectric material in slot  106 ). Antenna  40 - 1  may also have one or more harmonic modes and/or parasitic elements that cover additional frequencies. Slot  106  may also be a radiating slot that contributes to the frequency response of antenna  40 - 1  (e.g., antenna  40 - 1  may be a hybrid inverted-F slot antenna). 
     Antenna feed  48 - 1  may be coupled to transceiver circuitry  60  using radio-frequency transmission line path  50 - 1 . Impedance matching circuitry such as matching network (MN)  92 - 1  may be interposed on radio-frequency transmission line path  50 - 1 . Matching network  92 - 1  may serve to match the impedance of radio-frequency transmission line path  50 - 1  to the impedance of antenna  40 - 1  and/or to tune the frequency response of antenna  40 - 1 . Antenna  40 - 1  may also include one or more tunable components such as a first tunable component  72 - 1  and a second tunable component  72 - 2  (e.g., tunable components such as tunable component  64  of  FIG. 3 ). Tunable component  72 - 1  may have a first terminal  86  coupled to segment  76  and a second (ground) terminal  112  coupled to ground structures  100 . Tunable component  72 - 2  may have a first terminal  88  coupled to segment  76  and a second (ground) terminal  114  coupled to ground structures  100 . Positive antenna feed terminal  56 - 1  may be interposed on segment  76  between terminals  86  and  88 . Tunable components  72 - 1  and  72 - 2  may help to tune the frequency response of antenna  40 - 1 . 
     Similarly, antenna  40 - 2  may have an antenna resonating element  68 - 2  that includes one or more antenna resonating element arms (e.g., arm  70  of  FIG. 4  or arms  70 H and  70 L of  FIG. 5 ) formed from segment  80  of peripheral conductive housing structures  12 W. Segment  80  may be coupled to ground structures  100  by return path  84  (e.g., a return path such as return path  73  of  FIGS. 4 and 5 ). Return path  84  may have a first terminal  90  coupled to segment  80  and a second terminal  116  coupled to ground structures  100 . The length of segment  80  may be selected to provide antenna  40 - 2  with response peaks in one or more communications bands. Antenna  40 - 2  may also have one or more harmonic modes and/or parasitic elements that cover additional frequencies. Slot  106  may be a radiating slot that contributes to the frequency response of antenna  40 - 2  (e.g., antenna  40 - 2  may be a hybrid inverted-F slot antenna). 
     Antenna  40 - 2  may have an antenna feed  48 - 2  with a positive antenna feed terminal  56 - 2  coupled to segment  80  and a ground antenna feed terminal  58 - 2  coupled to ground structures  100 . Antenna feed  48 - 2  may be coupled to transceiver circuitry  60  using radio-frequency transmission line path  50 - 2 . Impedance matching circuitry such as matching network (MN)  92 - 2  may be interposed on radio-frequency transmission line path  50 - 2 . Matching network  92 - 2  may serve to match the impedance of radio-frequency transmission line path  50 - 2  to the impedance of antenna  40 - 2  and/or to tune the frequency response of antenna  40 - 2 . If desired, other tunable components (e.g., tunable components  64  of  FIG. 3 ) may be coupled to antenna resonating element  68 - 2  to help tune the frequency response of antenna  40 - 2  (not shown in  FIG. 6  for the sake of clarity). 
     The edge of ground structures  100  defining the lower edge of slot  106  may be aligned with the lower edge of gaps  18 - 1  and  18 - 3  or, as shown in the arrangement of  FIG. 6 , may extend parallel to the Y-axis beyond the lower edge of gaps  18 - 1  and  18 - 3 . For example, slot  106  may include a first extended portion  110  that extends below gap  18 - 1  and a second extended portion  108  that extends below gap  18 - 3  (e.g., extended portions  110  and  108  may form opposing sides of slot  106  along the longest dimension of slot  106 ). If desired, extended portion  110  of slot  106  may contribute to the frequency response of antenna  40 - 1  (e.g., the perimeter of extended portion  110  may contribute additional response peaks for antenna  40 - 1 ). If desired, extended portion  108  of slot  106  may contribute to the frequency response of antenna  40 - 2  (e.g., the perimeter of extended portion  108  may contribute additional response peaks for antenna  40 - 1 ). Tunable components may, if desired, be coupled across extended portions  108  and/or  110  (e.g., between ground structures  100  and interior surface  118  of segment  82 ) to help tune the frequency response of antennas  40 - 2  and  40 - 1  (not shown in  FIG. 6  for the sake of clarity). The example of  FIG. 6  is merely illustrative and, in general, slot  106  may have any desired shape and may follow any desired path (e.g., any desired shape having any desired number of curved and/or straight edges and any desired path having any desired number of straight and/or curved segments). 
     Antenna  40 - 3  may have an antenna resonating element  68 - 3  that at least partially (e.g., completely) overlaps slot  106  (e.g., extended portion  110  of slot  106 ). Antenna resonating element  68 - 3  may include one or more antenna resonating element arms (e.g., arm  70  of  FIG. 4 , arms  70 H and  70 L of  FIG. 5 , monopole resonating element arms, dipole resonating element arms, etc.). Antenna resonating element  68 - 3  may also include portions of segment  76  and/or tunable component  72 - 1  if desired (e.g., antenna currents conveyed by antenna feed  48 - 3  may induce corresponding antenna currents on portions of antenna  40 - 1  via near-field electromagnetic coupling). The length of antenna resonating element  68 - 3  may be selected to provide antenna  40 - 3  with response peaks in one or more communications bands. Harmonic modes of antenna resonating element  68 - 3  may also contribute the frequency response of antenna  40 - 3 . 
     Antenna  40 - 3  may have an antenna feed  48 - 3  with a positive antenna feed terminal coupled to antenna resonating element  68 - 3  and a ground antenna feed terminal coupled to ground structures  100 . Antenna feed  48 - 3  may be coupled to transceiver circuitry  60  using radio-frequency transmission line path  50 - 3 . Impedance matching circuitry such as matching network (MN)  92 - 3  may be interposed on radio-frequency transmission line path  50 - 3 . Matching network  92 - 3  may serve to match the impedance of radio-frequency transmission line path  50 - 3  to the impedance of antenna  40 - 3  and/or to tune the frequency response of antenna  40 - 3 . If desired, tunable components (e.g., tunable component  64  of  FIG. 3 ) may be coupled to antenna  40 - 3  to help tune the frequency response of antenna  40 - 3  (not shown in  FIG. 6  for the sake of clarity). 
     Antennas  40 - 1 ,  40 - 2 , and  40 - 3  may be configured to cover any desired communications bands. In one suitable arrangement that is sometimes described herein as an example, antenna  40 - 1  may convey radio-frequency signals in a cellular low band (e.g., between 617 and 960 MHz), a cellular low-mid band (e.g., between 1430 and 1510 MHz), a cellular mid band (e.g., between 1710 and 2170 MHz), a satellite navigation band (e.g., a GPS band between 1565 and 1605 MHz), and/or a cellular high band (e.g., between 2300 and 2700 MHz). Antenna  40 - 2  may convey radio-frequency signals in the cellular midband, the cellular high band, a first WLAN band and/or WPAN band at 2.4 GHz (e.g., between 2400 and 2480 MHz), and/or a cellular ultra-high band (e.g., between 3400 and 3700 MHz). Antenna  40 - 3  may convey radio-frequency signals in the cellular ultra-high band, a second WLAN band at 5 GHz (e.g., between 5180 and 5850 MHz), a first ultra-wideband communications band (e.g., between 6250 and 6750 MHz such as in UWB channel 5), and/or a second ultra-wideband communications band (e.g., between 7750 and 8250 MHz such as in UWB channel 9). Tunable component  72 - 1  may, for example, tune the frequency response of antenna  40 - 1  in the cellular midband and/or cellular low-midband. Tunable component  72 - 2  may, for example, tune the frequency response of antenna  40 - 1  in the cellular low band. This example is merely illustrative and, in general, antennas  40 - 1 ,  40 - 2 , and  40 - 3  may each cover some or all of any of these bands and/or other communications bands. 
     Ground structures  100  may be formed from conductive housing structures, from electrical device components in device  10 , from printed circuit board traces, from strips of conductor such as strips of wire and metal foil, from conductive portions of display  14  ( FIG. 1 ), and/or other conductive structures. In one suitable arrangement, ground structures  100  may include conductive portions of housing  12  (e.g., portions of rear housing wall  12 R of  FIG. 1  and/or portions of a different conductive support plate in device  10 ) and conductive portions of display  14  ( FIG. 1 ). Segments  78  and  82  of peripheral conductive housing structures  12 W may be coupled to ground structures  100  and may therefore form part of the antenna ground for antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and/or  40 - 6 . Segments  78  and  82  and ground structures  100  may be formed from a single integral piece of metal if desired. 
     If desired, ground structures  100  may include multiple conductive structures such as one or more conductive layers within device  10 . For example, ground structures  100  may include a first conductive layer formed from a portion of housing  12  (e.g., a conductive backplate or support plate that forms part of rear housing wall  12 R of  FIG. 1 ) and a second conductive layer formed from a conductive display frame or support plate associated with display  14  ( FIG. 1 ). In these scenarios, conductive interconnect structures (e.g., conductive screws, conductive brackets, conductive clips, conductive pins, conductive springs, solder, welds, conductive adhesive, conductive screw bosses, etc.) may electrically connect terminals  58 - 1 ,  58 - 2 ,  112 ,  114 ,  116 , and/or the ground terminal for antenna feed  48 - 3  to both the conductive display layer and the conductive housing layer. This may allow ground structures  100  to extend across both conductive portions of housing  12  and display  14  ( FIG. 1 ) so that the conductive material closest to antennas  40 - 1 ,  40 - 2 , and  40 - 3  are held at a ground potential. This may, for example, serve to maximize the antenna efficiency of antenna  40 - 1 ,  40 - 2 , and/or antenna  40 - 3 . 
     Terminals  86 ,  56 - 1 , and  88  may, for example, be coupled to interior (internal) surface  122  of segment  76 , whereas terminals  90  and  56 - 2  are coupled to interior (internal) surface  120  of segment  80 . Terminal  86  may include any desired conductive interconnect structures for coupling (e.g., electrically connecting, mechanically attaching or securing, etc.) tunable component  72 - 1  to segment  76 . Similarly, positive antenna feed terminal  56 - 1  may include any desired conductive interconnect structures for coupling antenna feed  48 - 1  to segment  76 , terminal  88  may include any desired conductive interconnect structures for coupling tunable component  72 - 2  to segment  76 , terminal  90  may include any desired conductive interconnect structures for coupling return path  84  to segment  80 , and positive antenna feed terminal  56 - 2  may include any desired conductive interconnect structures for coupling antenna feed  48 - 2  to segment  80 . The conductive interconnect structures used to form terminals  86 ,  56 - 1 ,  88 ,  90 , and  56 - 2  may include, for example, solder, welds, conductive adhesive, conductive foam, conductive clips, conductive pins, conductive brackets, conductive gaskets, conductive springs, conductive traces on underlying dielectric substrates, integral portions of peripheral conductive housing structures  12 W (e.g., an inwardly-extending ledge or lip of peripheral conductive housing structures  12 W), conductive screws, conductive screw bosses, conductive washers or other conductive structures having openings for receiving conductive screws or pins, and/or any other desired conductive interconnect structures. 
     As shown in  FIG. 6 , antenna  40 - 4  may include an antenna resonating element  68 - 4  aligned with opening  94  in ground structures  100 , antenna  40 - 5  may include an antenna resonating element  68 - 5  aligned with opening  96  in ground structures  100 , and antenna  40 - 6  may include an antenna resonating element  68 - 6  aligned with opening  98  in ground structures  100 . Antenna resonating elements  68 - 4 ,  68 - 5 , and  68 - 6  may each include respective antenna feeds that are coupled to transceiver circuitry  60  using corresponding radio-frequency transmission line paths  50  (not shown in  FIG. 6  for the sake of clarity). In one suitable arrangement that is sometimes described herein as an example, antenna resonating elements  68 - 4 ,  68 - 5 , and  68 - 6  may each be multi-band planar inverted-F antenna resonating elements (e.g., having multiple arms such as arms  70 H and  70 L of  FIG. 5 ). 
     Antennas  40 - 4 ,  40 - 5 , and  40 - 6  may, for example, be used to transmit and receive UWB signals through the rear face of device  10  (e.g., through rear housing wall  12 R of  FIG. 1 ). Antennas  40 - 4 ,  40 - 5 , and  40 - 6  may, for example, form a triplet of antennas that can receive UWB signals that are processed by control circuitry  28  ( FIG. 2 ) to determine a three-dimensional angle-of-arrival of the received UWB signals. Antennas  40 - 4 ,  40 - 5 , and  40 - 6  may each convey the UWB signals in a first ultra-wideband communications band such as the 6.5 GHz ultra-wideband communications band (e.g., at frequencies between 6250 and 6750 MHz using arm  70 L of  FIG. 5 ) and in a second ultra-wideband communications band such as the 8.0 GHz ultra-wideband communications band (e.g., at frequencies between 7750 and 8250 MHz using arm  70 H of  FIG. 5 ). 
     Conductive structures over antennas  40 - 4 ,  40 - 5 , and  40 - 6  (e.g., display  14  of  FIG. 1 , a battery for device  10 , etc.) may effectively block antennas  40 - 4 ,  40 - 5 , and  40 - 6  from transmitting or receiving UWB signals through the front face of device  10  (e.g., in the +Z direction). In order to help provide UWB coverage through the front face of device  10  (e.g., to provide a full sphere of UWB coverage around all sides of device  10 ), antenna  40 - 3  may also be used to transmit and/or receive UWB signals. Because antenna  40 - 3  is located at the corner of device  10 , antenna  40 - 3  may be at least partially aligned with the inactive area of the display at the front face of device  10  (e.g., inactive area IA of display  14  of  FIG. 1 ). This may allow antenna  40 - 3  to transmit and/or receive UWB signals through the front face of device  10  without the signals being blocked by conductive structures in display  14  (e.g., pixel circuitry or other components associated with active area AA of  FIG. 1 ). Antenna currents induced on peripheral conductive housing structures  12 W by antenna resonating element  68 - 3  may also help to ensure that antenna  40 - 3  can convey radio-frequency signals through the front face of device  10 . Antenna  40 - 3  may also convey UWB signals through the rear face of device  10  (e.g., through slot  106  in the −Z direction) and laterally through gap  18 - 1  in peripheral conductive housing structures  12 W. 
     Antenna  40 - 3  may be used to transmit UWB signals for use by external communications equipment (e.g., external communications equipment  10 ′ of  FIG. 2 ) in determining an angle of arrival of the transmitted UWB signals and/or a distance between the external communications equipment and device  10 . If desired, antenna  40 - 3  may also be used to receive UWB signals from external communications equipment (e.g., external communications equipment  10 ′ of  FIG. 2 ) for use in determining the distance between the external communications equipment and device  10 . In one suitable arrangement, antenna  40 - 3  may only transmit UWB signals without also receiving UWB signals. Because only a single antenna conveys UWB signals through the front face of device  10  in this example, the UWB signals conveyed by antenna  40 - 3  through the front face of device  10  may be used to determine a range between device  10  and the external wireless equipment without also determining an angle of arrival. This example is merely illustrative. 
     If desired, antenna  40 - 3  may also be used to convey non-UWB signals in one or more other communications bands in addition to conveying UWB signals. In one suitable arrangement that is sometimes described herein as an example, antenna  40 - 3  may convey non-UWB signals in first and second communications bands such as a 5.0 GHz WLAN communications band (e.g., a frequency band from about 5180 MHz to about 5850 MHz) and one or more cellular ultra-high bands at frequencies between about 3400 MHz and 3700 MHz. Examples of cellular ultra-high bands that may be covered by antenna  40 - 3  include Long Term Evolution (LTE) band B42 (e.g., between about 3.4 GHz and 3.6 GHz) and LTE band B48 (e.g., between about 3.6 GHz and 3.7 GHz). 
       FIG. 7  is a cross-sectional side view showing how antenna  40 - 4  may be pressed against a rear housing wall of device  10  for conveying UWB signals through the rear housing wall. As shown in  FIG. 7 , resonating element  68 - 4  of antenna  40 - 4  may be formed on flexible printed circuit substrate  130 . Flexible printed circuit substrate  130  may form part of a larger flexible printed circuit structure that includes other flexible printed circuit substrates for mounting antennas  40 - 3 ,  40 - 5 , and/or  40 - 6  of  FIG. 6 . 
     As shown in  FIG. 7 , ground structures  100  may form a portion of rear housing wall  12 R (e.g., a conductive support plate or other conductive layer for rear housing wall  12 R). Rear housing wall  12 R may also include a dielectric cover layer such as dielectric cover layer  124  layered under ground structures  100 . Flexible printed circuit substrate  130  may extend along ground structures  100 . The portion of flexible printed circuit substrate  130  that includes antenna resonating element  68 - 4  may extend within opening  94  in ground structures  100  (e.g., antenna resonating element  68 - 4  may be aligned with opening  94 ). Antenna resonating element  68 - 4  and/or ground structures  100  may be adhered to dielectric cover layer  124  using adhesive if desired. 
     A conductive structure such as conductive structure  126  may be located (layered) over ground structures  100  and flexible printed circuit substrate  130 . Conductive structure  126  may, for example, completely cover opening  94 . Conductive structure  126  may be galvanically connected to ground structures  100  (e.g., using solder, welds, or other conductive adhesives), may be placed into contact with ground structures  100 , or may be separated from and capacitively coupled to ground structures  100 . Conductive structure  126  may include a conductive shielding layer (e.g., a sheet metal layer, conductive adhesive, conductive traces on a dielectric substrate, conductive portions of the housing for device  10 , conductive foil, ferrite, or any other desired structures that block radio-frequency signals), conductive portions of components in device  10  such as conductive portions of a battery for device  10  or conductive portions of camera module  104  of  FIG. 6 , or any other desired conductive structures. 
     Antenna  40 - 4  may convey radio-frequency signals  128  (e.g., UWB signals) through opening  94  and dielectric cover layer  124  (e.g., through rear housing wall  12 R and the rear face of device  10 ). Similar structures may also be used to configure antennas  40 - 5  and  40 - 6  of  FIG. 6  to radiate through rear housing wall  12 R. The example of  FIG. 7  is merely illustrative. If desired, conductive structure  126  may be omitted. In another suitable arrangement, a dielectric substrate such as a dielectric shim may be placed on dielectric cover layer  124  within opening  94 . 
     In one suitable arrangement that is sometimes described herein as an example, antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  are each mounted to the same flexible printed circuit structure. The flexible printed circuit structure may include two or more flexible printed circuit substrates. The flexible printed circuit substrates in the flexible printed circuit structure may be mounted together (e.g., using a surface-mount technology (SMT) process). If desired, two or more of these antennas may be formed on the same flexible printed circuit substrate in the flexible printed circuit structure. In order to help conserve space within device  10 , the flexible printed circuit structure may also include the radio-frequency transmission line paths  50  for antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and/or  40 - 6  (e.g., radio-frequency transmission line paths  50 - 1 ,  50 - 2 , and  50 - 3  of  FIG. 6  as well as radio-frequency transmission line paths for antennas  40 - 4 ,  40 - 5 , and  40 - 6 ). Using the same flexible printed circuit structure to support antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  and to route radio-frequency signals for antennas  40 - 1  and  40 - 2  may help to minimize space consumption within device  10  (e.g., thereby allowing more space for other device components) without significantly impacting antenna performance. 
       FIG. 8  is a perspective view of an illustrative flexible printed circuit structure that may be used to support antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  while also routing radio-frequency signals for antennas  40 - 1  and  40 - 2  of  FIG. 6 . As shown in  FIG. 8 , flexible printed circuit structure  132  may include two or more flexible printed circuit substrates such as flexible printed circuit substrates  130 ,  133 , and  134  (sometimes referred to herein as flexible printed circuits  130 ,  133 , and  134 ). 
     Flexible printed circuit structure  132  may include multiple bends (folds) along one or more axes. This may allow flexible printed circuit structure  132  to exhibit a meandering shape that accommodates other nearby components within device  10 . Flexible printed circuit substrates  130 ,  133 , and  134  may each be multilayer laminated structures having layers of conductive traces (e.g., layers of a conductive material such as copper and a dielectric material such as a resin that are laminated together without intervening adhesive). The multilayer laminated structures may, if desired, be folded or bent in multiple dimensions (e.g., two or three dimensions) and may maintain a bent or folded shape after bending (e.g., the multilayer laminated structures may be folded into a particular three-dimensional shape to route around other device components and may be rigid enough to hold its shape after folding without being held in place by stiffeners or other structures). All of the multiple layers of the laminated structures in each flexible printed circuit substrate may be batch laminated together (e.g., in a single pressing process) without adhesive (e.g., as opposed to performing multiple pressing processes to laminate multiple layers together with adhesive). 
     As shown in  FIG. 8 , flexible printed circuit substrate  130  may include portions (regions) such as portions  144 ,  146 ,  166 , and  148 . Portions  144 ,  166 , and  148  may each extend from respective edges of portion  146  (e.g., portion  146  may be a central portion of flexible printed circuit substrate  130 ). Portion  144  may be bent (folded) about axis  160  with respect to portion  146  (e.g., an axis parallel to the Y-axis). Portion  166  may be bent (folded) about axis  152  with respect to portion  146  (e.g., an axis parallel to the X-axis). Portion  148  may be bent (folded) about axis  150  with respect to portion  146  (e.g., an axis parallel to the Y-axis). There may be multiple bends at or adjacent to axis  150  (e.g., so that portion  148  lies in a plane parallel to portion  146 ). 
     Axis  150  may be parallel to axis  160  or may extend at a non-zero angle with respect to axis  160 . Axis  152  may extend at a non-zero angle with respect to (e.g., may be orthogonal to) axes  150  and/or  160 . The bends in flexible printed circuit substrate  130  may be at any desired angles (e.g., portion  144  may lie in a plane perpendicular or non-parallel to portions  148 ,  146 , and/or  166 , portion  166  may lie in a plane perpendicular or non-parallel to portions  144 ,  146 , and  148 , etc.). 
     In other words, flexible printed circuit substrate  130  may include at least three bends (e.g., bends in at least two orthogonal directions) and portions lying in at least three non-parallel (e.g., orthogonal) planes. The example of  FIG. 8  is merely illustrative and, in general, flexible printed circuit substrate  130  may include any desired number of bends about any desired number of axes at any desired orientations. Portions  146 ,  148 ,  166 , and  144  may lie within any desired planes at any desired relative orientations. Portions  146 ,  148 ,  166 , and  144  need not be confined to planes and may laterally extend along three-dimensional (e.g., curved) surfaces if desired. 
     Flexible printed circuit substrate  133  may include portions (regions) such as portions  140 ,  138 , and  136 . Portion  140  may be bent (folded) about axis  158  with respect to portions  136  and  138  (e.g., an axis parallel to the X-axis). Axis  158  may be parallel to axis  152  or may extend at a non-zero angle with respect to axis  152 . Axis  158  may extend at a non-zero (e.g., perpendicular) angle with respect to axes  150  and/or  160 . The bend(s) in flexible printed circuit substrate  133  may be at any desired angles (e.g., portion  140  may lie in a plane perpendicular or non-parallel to portions  136  and/or  138 ). Portion  138  may lie within the same plane as portion  136  or may lie in a plane parallel to portion  138 . Portion  136  and/or portion  138  may lie in the same plane or in one or more planes parallel to portions  148  and/or  146  of flexible printed circuit substrate  130 . Portion  140  may lie in a plane perpendicular or non-parallel to the plane of portion  144  and may lie in a plane parallel to portion  166  of flexible printed circuit substrate  130 , for example. 
     In other words, flexible printed circuit substrate  133  may include at least one bend and portions lying in at least two non-parallel (e.g., orthogonal) planes. This example is merely illustrative and, in general, flexible printed circuit substrate  133  may include any desired number of bends about any desired number of axes at any desired orientations. Portions  136 ,  138 , and  140  may lie within any desired planes at any desired relative orientations. Portions  136 ,  138 ,  140  need not be confined to planes and may laterally extend along three-dimensional (e.g., curved) surfaces if desired. 
     Flexible printed circuit substrate  134  may include portions (regions) such as portions  142 ,  162 ,  165 , and  164 . Portion  142  may be bent (folded) about (vertical) axis  156  with respect to portion  162  (e.g., an axis parallel to the Z-axis). Axis  156  may be non-parallel (e.g., perpendicular) to axes  152 ,  158 ,  150 ,  152 , and  160  (sometimes referred to herein as horizontal or lateral axes  152 ,  158 ,  150 ,  152 , and  160 ). Portion  164  may be bent (folded) about (vertical) axis  154  (e.g., an axis parallel to the Z-axis) with respect to portion  162 . Axis  154  may be parallel to axis  156  or may extend at a non-parallel angle with respect to axis  156 . Axis  154  may be non-parallel (e.g., perpendicular) to axes  152 ,  158 ,  150 ,  152 , and  160 . Portion  165  may be bent (folded) about (lateral) axis  167  (e.g., an axis parallel to the X-axis). Axis  167  may be parallel to axes  158  and  152  or may extend at a non-parallel angle with respect to axes  158  and  152 . Axis  167  may be oriented at a non-parallel (e.g., perpendicular angle) with respect to axes  150  and/or  160 . 
     The bend(s) in flexible printed circuit substrate  134  may be at any desired angles. For example, portion  164  may lie within a plane parallel to portion  142  and portion  144  of flexible printed circuit substrate  130  or may lie in a plane that is non-parallel with respect to portions  142  and  144 . Portion  162  may lie within a plane that is non-parallel (e.g., perpendicular) with respect to portions  142  and  164 . Portion  162  may, for example, lie within a plane parallel to portion  166  of flexible printed circuit substrate  130 . Portion  165  may lie within a plane that is parallel to portions  146 ,  136 , and/or  138  or may lie within a plane that is non-parallel with respect to portions  146 ,  136 , and  138 . Portion  165  may, for example, lie within a plane that is non-parallel (e.g., perpendicular) to portions  142 ,  162 , and  164 . 
     In other words, flexible printed circuit substrate  134  may include at least two bends and portions lying in at least three non-parallel (e.g., orthogonal) planes. The planes of portions  142 ,  162 , and  164  may be perpendicular to portions  146 ,  148 ,  136 , and  138 , thereby allowing flexible printed circuit substrate  134  to wrap around electronic device components that occupy a significant amount of lateral area in device  10  (e.g., camera module  104 ). When provided in this arrangement, portion  164  may be laterally interposed between camera module  104  and segment  80  of peripheral conductive housing structures  12 W ( FIG. 6 ). This example is merely illustrative and, in general, flexible printed circuit substrate  134  may include any desired number of bends in about any desired number of axes at any desired orientations. Portions  142 ,  162 ,  165 , and  164  may lie within any desired planes at any desired relative orientations. Portions  142 ,  162 ,  165 , and  164  need not be confined to planes and may laterally extend along three-dimensional (e.g., curved) surfaces if desired. 
     Flexible printed circuit substrates  130 ,  133 , and/or  134  in flexible printed circuit structure  132  may include one or more lateral cut-out regions  184  (e.g., cut outs in the lateral dimension of the respective flexible printed circuit substrates) that help flexible printed circuit structure  132  to fit within device  10  while accommodating other device components in the vicinity of flexible printed circuit structure  132 . 
     Flexible printed circuit substrates  130  and  133  may each be attached (e.g., surface mounted) to flexible printed circuit substrate  134  to form flexible printed circuit structure  132 . For example, portion  144  of flexible printed circuit substrate  130  may be attached (e.g., surface mounted) to portion  142  of flexible printed circuit substrate  134  whereas portion  140  of flexible printed circuit substrate  133  is attached (e.g., surface mounted) to portion  162  of flexible printed circuit substrate  134 . There may be, for example, conductive contact pads on portions  144  and  142  that are soldered together and conductive contact pads on portions  140  and  162  that are soldered together during assembly of flexible printed circuit structure  132  (e.g., using an SMT process, a reflow process, a hot bar process, etc.). Once flexible printed circuit substrates  130 ,  133 , and  134  have been attached together and folded, flexible printed circuit structure  132  may retain its shape upon assembly into device  10 . 
     Antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  of  FIG. 6  may be formed on flexible printed circuit structure  132 . For example, the antenna resonating element  68 - 4  of antenna  40 - 4  may be formed within portion  146  of flexible printed circuit substrate  130  whereas the antenna resonating element  68 - 5  of antenna  40 - 5  is formed within portion  136  and antenna resonating element  40 - 6  of antenna  40 - 6  is formed within portion  138  of flexible printed circuit substrate  133  (e.g., the triplet of UWB antennas for radiating through the rear housing wall of device  10  may be split between flexible printed circuit substrates  130  and  133  of flexible printed circuit structure  132 ). Similarly, the antenna resonating element  68 - 3  of antenna  40 - 3  may be formed within portion  148  of flexible printed circuit substrate  130 . Antenna resonating elements  68 - 3  and  68 - 4  may be formed from one or more conductive layers on or embedded within the dielectric layers of flexible printed circuit substrate  130 . Similarly, antenna resonating elements  68 - 5  and  68 - 6  may be formed from one or more conductive layers on or embedded within the dielectric layers of flexible printed circuit substrate  133 . Antenna resonating elements  68 - 4 ,  68 - 5 , and  68 - 6  may be pressed or biased (e.g., in the direction of arrow  192 ) against the rear housing wall for the device (e.g., dielectric cover layer  124  of  FIG. 7 ). 
     A data port such as board-to-board (B2B) port  163  may be mounted to portion  165  of flexible printed circuit substrate  134 . Port  163  may include data paths, radio-frequency paths, control paths, digital paths, and/or any other desired signal paths for conveying signals to and/or from flexible printed circuit structure  132 . Port  163  may be coupled to transceiver circuitry (e.g., transceiver circuitry  60  on logic board  102  of  FIG. 6 ) and/or control circuitry (e.g., control circuitry  28  of  FIG. 2 ). 
     Radio-frequency transmission lines (e.g., striplines, microstrips, etc.) may be formed on flexible printed circuit substrate  134  for forming part of the radio-frequency transmission line paths (e.g., radio-frequency transmission line paths  50  of  FIG. 6 ) that are used to feed antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6 . Radio-frequency transmission lines (e.g., striplines, microstrips, etc.) may be formed on flexible printed circuit substrate  133  and may be coupled to the radio-frequency transmission lines on flexible printed circuit substrate  134  at portion  140  (e.g., portion  140  may include radio-frequency interfaces between the radio-frequency transmission lines on each substrate). The radio-frequency transmission lines on flexible printed circuit substrate  133  may be coupled to antenna resonating elements  68 - 5  and  68 - 6  (e.g., for feeding antennas  40 - 5  and  40 - 6  of  FIG. 6 ). 
     Similarly, radio-frequency transmission lines (e.g., striplines, microstrips, etc.) may be formed on flexible printed circuit substrate  130  and may be coupled to the radio-frequency transmission lines on flexible printed circuit substrate  134  at portion  144  (e.g., portion  144  may include radio-frequency interfaces between the radio-frequency transmission lines on each substrate). The radio-frequency transmission lines on flexible printed circuit substrate  130  may be coupled to antenna resonating elements  68 - 3  and  68 - 4  (e.g., for feeding antennas  40 - 3  and  40 - 4  of  FIG. 6 ) and may be coupled to antenna resonating element  68 - 1  for feeding antenna  40 - 1  of  FIG. 6 . In addition, one of the radio-frequency transmission lines on flexible printed circuit substrate  134  may be coupled to antenna resonating element  68 - 2  for feeding antenna  40 - 2  of  FIG. 6  (e.g., without passing the transmission line path through flexible printed circuit substrates  130  or  133 ). There may also be digital data lines, control lines, or other lines on flexible printed circuit substrates  130 ,  133 , and  134 . 
     Tunable components and impedance matching circuitry may be mounted to flexible printed circuit structure  132 . For example, tunable component  72 - 1  for antenna  40 - 1  of  FIG. 6  may be mounted (e.g., surface-mounted) to portion  148  of flexible printed circuit substrate  130 , whereas tunable component  72 - 2  for antenna  40 - 1  of  FIG. 6  is mounted (e.g., surface-mounted) to portion  146  of flexible printed circuit substrate  130 . Matching network  92 - 3  for antenna  40 - 3  and matching network  92 - 1  for antenna  40 - 1  of  FIG. 6  may be mounted to portion  148  of flexible printed circuit substrate  130 . Matching network  92 - 2  for antenna  40 - 2  of  FIG. 6  may be mounted to portion  164  of flexible printed circuit substrate  134 . Tunable component  72 - 1 , tunable component  72 - 2 , matching network  92 - 1 , and/or matching network  92 - 2  may be controlled using control paths formed on flexible printed circuit substrates  130  and/or  134 . 
     Ground traces may also be formed on flexible printed circuit substrates  130 ,  133 , and/or  134 . The ground traces may form part of the antenna ground (e.g., antenna ground  66  of  FIGS. 4 and 5  and/or ground structures  100  of  FIG. 6 ) for the antennas in device  10 . The ground traces may also be used to isolate radio-frequency transmission lines and/or control paths on flexible printed circuit structure  132  from each other. The ground traces on flexible printed circuit substrate  130  may be coupled to the ground traces on flexible printed circuit substrate  134  (e.g., using solder) at portions  144  and  142 . Similarly, the ground traces on flexible printed circuit substrate  133  may be coupled to the ground traces on flexible printed circuit substrate  134  (e.g., using solder) at portions  140  and  162 . Ground traces on flexible printed circuit substrate  134  may be coupled to a ground pin or ground connector at port  163 . 
     Flexible printed circuit structure  132  may include conductive interconnect structures used in forming terminals  86 ,  56 - 1 ,  88 ,  90 ,  56 - 2 ,  112 ,  58 - 1 ,  114 ,  116 , and/or  58 - 2  of  FIG. 6 . For example, flexible printed circuit structure  132  may include conductive interconnect structures  174 ,  170 ,  168 ,  172 ,  186 ,  188 ,  176 ,  190 , and  182 . Conductive interconnect structures  174 ,  170 ,  168 ,  172 ,  186 , and  188  may be formed on flexible printed circuit substrate  130  whereas conductive interconnect structures  176 ,  190 , and  182  are formed on flexible printed circuit substrate  134 . 
     Conductive interconnect structures  174 ,  170 ,  168 ,  172 ,  186 ,  188 ,  176 ,  190 , and  182  may include, for example, solder, welds, conductive adhesive, conductive foam, conductive clips, conductive pins, conductive brackets, conductive gaskets, conductive springs, conductive traces on underlying dielectric substrates, integral portions of peripheral conductive housing structures  12 W (e.g., an inwardly-extending ledge or lip of peripheral conductive housing structures  12 W), conductive screws, conductive screw bosses, conductive washers or other conductive structures having openings for receiving conductive screws or pins, and/or any other desired conductive interconnect structures. In the example of  FIG. 8 , conductive interconnect structures  174 ,  170 ,  168 ,  172 ,  186 ,  188 ,  176 ,  190 , and  182  are depicted as including conductive structures having openings for receiving conductive screws or pins for the sake of clarity. Conductive screws or pins that pass through the openings in conductive interconnect structures  174 ,  170 ,  168 ,  172 ,  186 ,  188 ,  176 ,  190 , and  182  may electrically connect conductive paths on flexible printed circuit structure  132  to other conductive components in device  10  while also helping to mechanically attach (secure) flexible printed circuit structure  132  within device  10 . 
     For example, conductive interconnect structure  174  may be used in forming the ground antenna feed terminal for antenna feed  48 - 3  of  FIG. 6 . Conductive interconnect structure  174  may electrically couple ground traces on flexible printed circuit substrate  130  to ground structures  100  of  FIG. 6  while also helping to mechanically secure flexible printed circuit structure  132  to ground structures  100 . 
     Similarly, conductive interconnect structure  170  may be used in forming terminal  86  ( FIG. 6 ) of tunable component  72 - 1 . Conductive interconnect structure  170  may electrically couple tunable component  72 - 1  to segment  76  of peripheral conductive housing structures  12 W ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to peripheral conductive housing structures  12 W. Conductive interconnect structure  172  may be used in forming terminal  112  ( FIG. 6 ) of tunable component  72 - 1 . Conductive interconnect structure  172  may electrically couple tunable component  72 - 1  to ground structures  100  ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to ground structures  100 . 
     Conductive interconnect structures  168  and  186  (e.g., portion  166  of flexible printed circuit substrate  130 ) may be pressed or biased (e.g., in the direction of arrow  194 ) against the interior surface  122  of the segment  76  of peripheral conductive housing structures  12 W ( FIG. 6 ). Conductive interconnect structure  168  may be used in forming positive antenna feed terminal  56 - 1  for antenna  40 - 1  ( FIG. 6 ). Conductive interconnect structure  168  may electrically couple antenna feed  48 - 1  for antenna  40 - 1  to segment  76  of peripheral conductive housing structures  12 W ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to peripheral conductive housing structures  12 W. If desired, conductive interconnect structure  172  may also or alternatively form ground antenna feed terminal  58 - 1  for antenna  40 - 1  ( FIG. 6 ). 
     Conductive interconnect structure  186  may be used in forming terminal  88  ( FIG. 6 ) of tunable component  72 - 2 . Conductive interconnect structure  186  may electrically couple tunable component  72 - 2  to segment  76  of peripheral conductive housing structures  12 W ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to peripheral conductive housing structures  12 W. Conductive interconnect structure  188  may be used in forming terminal  114  of tunable component  72 - 2 . Conductive interconnect structure  188  may electrically couple tunable component  72 - 2  to ground structures  100  ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to ground structures  100 . 
     Conductive interconnect structure  176  may be used to couple ground traces on flexible printed circuit substrate  134  to conductive portions of other components in device  10  (e.g., camera module  104 ), to ground structures  100  of  FIG. 6 , and/or to any other desired components. Conductive interconnect structure  176  may help to mechanically secure flexible printed circuit structure  132  in place within device  10 . 
     Conductive interconnect structures  190  and  182  (e.g., portion  164  of flexible printed circuit substrate  134 ) may be pressed or biased (e.g., in the direction of arrow  196 ) against the interior surface  120  of segment  80  and/or the interior surface  118  of segment  82  of peripheral conductive housing structures  12 W ( FIG. 6 ). Conductive interconnect structure  182  may be used in forming positive antenna feed terminal  56 - 2  for antenna  40 - 2  ( FIG. 6 ). Conductive interconnect structure  182  may electrically couple antenna feed  48 - 2  for antenna  40 - 2  to segment  80  of peripheral conductive housing structures  12 W ( FIG. 6 ) while also helping to mechanically secure flexible printed circuit structure  132  to peripheral conductive housing structures  12 W. Conductive interconnect structures  190  may be used in coupling ground traces on flexible printed circuit substrate  134  to ground structures  100 , segment  80 , and/or segment  82  of peripheral conductive housing structures  12 W, and/or in forming ground antenna feed terminal  58 - 2  for antenna  40 - 2  ( FIG. 6 ). Conductive interconnect structures  190  may also help to mechanically secure flexible printed circuit structure  132  to peripheral conductive housing structures  12 W and/or ground structures  100 . 
     In this way, flexible printed circuit structure  132  may be used to form the antenna resonating elements for antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  while also forming the radio-frequency transmission line paths for antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  ( FIG. 8 ). For example, radio-frequency transmission line path  50 - 1  of  FIG. 6  may include a first radio-frequency transmission line in flexible printed circuit substrate  130  extending from conductive interconnect structures  168  and  172  to a corresponding radio-frequency contact pad in portion  144 . The radio-frequency transmission line path may include a second radio-frequency transmission line in flexible printed circuit substrate  134  extending from a radio-frequency contact pad in portion  142  (e.g., a contact pad soldered to the radio-frequency contact pad in portion  144 ) to port  163 . 
     Similarly, radio-frequency transmission line path  50 - 2  of  FIG. 6  may include a radio-frequency transmission line in flexible printed circuit substrate  134  that extends from conductive interconnect structures  182  and  190  to port  163 . In addition, radio-frequency transmission line path  50 - 3  of  FIG. 8  may include a first radio-frequency transmission line path in flexible printed circuit substrate  130  that extends from antenna resonating element  68 - 3  to a corresponding radio-frequency contact pad in portion  144 . The radio-frequency transmission line path may include a second radio-frequency transmission line in flexible printed circuit substrate  134  extending from a radio-frequency contact pad in portion  142  to port  163 . Radio-frequency transmission lines for antenna  40 - 4  may be formed in flexible printed circuit substrates  130  and  134 . Radio-frequency transmission lines for antennas  40 - 5  and  40 - 6  may be formed in flexible printed circuit substrates  133  and  134 . The example of  FIG. 8  is merely illustrative and, if desired, flexible printed circuit structure  132  may include only two flexible printed circuit substrates or more than three flexible printed circuit substrates. Flexible printed circuit structure  132  may include any desired folds or bends. Flexible printed circuit substrates  130 ,  133 , and  134  may have any desired lateral and/or three-dimensional shapes. 
     The modular folded structure of flexible printed circuit structure  132  may allow antennas  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  to be mounted and fed and to allow antennas  40 - 1  and  40 - 2  ( FIG. 6 ) to be fed while occupying a minimum amount of space within device  10  and while exhibiting satisfactory radio-frequency performance. Flexible printed circuit structure  132  may, for example, be folded or wrapped around and/or placed above and/or below other components in device  10  (e.g., camera module  104 ). If desired, flexible printed circuit structure  132  may also exhibit different thicknesses to help accommodate the presence of other components adjacent to flexible printed circuit structure  132 . The modular structure of flexible printed circuit structure  132  may allow flexible printed circuit structure  132  to be formed with many different thicknesses despite limitations associated with flexible printed circuit substrate manufacture. 
       FIG. 9  is a side view of flexible printed circuit structure  132  showing how flexible printed circuit structure  132  may have different thicknesses across its lateral area. In the example of  FIG. 9 , flexible printed circuit structure  132  has been flattened (or has not yet been folded or bent) for the sake of clarity. 
     As shown in  FIG. 9 , flexible printed circuit substrate  130  may include thinner portions and thicker portions that are thicker than the thinner portions by step size  198 . Flexible printed circuit substrate  133  may include thinner portions and thicker portions that are thicker than the thinner portions by step size  200 . Flexible printed circuit substrate  134  may include thinner portions and thicker portions that are thicker than the thinner portions by step size  202 . Step sizes  198 ,  200 , and  202  may be different from each other. The thinner portions of flexible printed circuit substrates  130 ,  133 , and  134  may be different thicknesses relative to each other and the thicker portions of flexible printed circuit substrates  130 ,  133 , and  134  may be different thicknesses relative to each other. This example is merely illustrative. Each flexible printed circuit substrate  130 ,  133 , and  134  may include multiple thinner and thicker portions, may include portions with more than two thicknesses, may include multiple step sizes, etc. The thinner portions may reduce the amount of space occupied by flexible printed circuit structure  132  to accommodate the presence of other components in the vicinity of flexible printed circuit structure  132 . 
     The thicker portions of flexible printed circuit structure  132  may be formed by adding additional layers of flexible printed circuit substrate material that are not included on the thinner portions of flexible printed circuit structure  132 . In practice, there are limits to the step sizes and thicknesses available during manufacture of any given flexible printed circuit substrate (e.g., the step sizes may each be less than about 100-120 microns). By separately manufacturing flexible printed circuit substrates  130 ,  133 , and  134  and then assembling the flexible printed circuit substrates to form flexible printed circuit structure  132 , flexible printed circuit structure  132  may exhibit a greater variety of different thicknesses and step sizes (e.g., to provide greater flexibility in accommodating other components in device  10 ) than in scenarios where flexible printed circuit structure  132  is formed from only a single flexible printed circuit substrate. 
       FIG. 10  is a flow chart of illustrative steps that may be performed in assembling flexible printed circuit structure  132  within device  10 . The steps of  FIG. 10  may, for example, be performed in a manufacturing or assembly system having manufacturing equipment (e.g., prior to device  10  being provided to an end user). 
     At step  204 , the manufacturing equipment may manufacture flexible printed circuit substrates  130 ,  133 , and  134  (e.g., with thinner and thicker regions and different thickness step sizes such as step sizes  198 ,  200 , and  202  of  FIG. 9 ). Flexible printed circuit substrates  130 ,  133 , and  134  may be manufactured in a flat (planar) configuration (e.g., from a planar sheet of flexible printed circuit material). Conductive traces may be patterned on the flexible printed circuit substrates (e.g., to form radio-frequency transmission lines, data paths, control paths, digital paths, ground traces, etc.). The manufacturing equipment may cut the flexible printed circuit substrates into a desired lateral shape (e.g., to define the lateral areas of the flexible printed circuit substrates and to include cut-out regions  184  of  FIG. 8 ). 
     At step  206 , the manufacturing equipment may mount components to flexible printed circuit substrates  130  and  134  (e.g., using an SMT process, solder, etc.). For example, the manufacturing equipment may mount tunable components  72 - 1  and  72 - 2  and matching network  92 - 1  and  92 - 3  to flexible printed circuit substrate  130  ( FIG. 8 ). The manufacturing equipment may also mount matching network  92 - 2  to flexible printed circuit substrate  134  ( FIG. 8 ). 
     At step  208 , the manufacturing equipment may attach flexible printed substrate  130  to flexible printed circuit substrate  134 . For example, the manufacturing equipment may use solder, an SMT process, a reflow process, and/or other processes, to attach portion  144  of flexible printed circuit substrate  130  to portion  142  of flexible printed circuit substrate  134 . 
     At step  210 , the manufacturing equipment (e.g., in a bonding line) may attach flexible printed substrate  133  to flexible printed circuit substrate  134 . For example, the manufacturing equipment may use solder, an SMT process, a reflow process, and/or other processes, to attach portion  140  of flexible printed circuit substrate  133  to portion  162  of flexible printed circuit substrate  134  (e.g., the manufacturing equipment may treat flexible printed circuit substrate  133  as an SMT component to be mounted to flexible printed circuit substrate  134 ). 
     At optional step  212 , the manufacturing system or a separate testing system may test the electromagnetic (e.g., radio-frequency) and/or mechanical performance of flexible printed circuit structure  132 . Step  212  may be omitted if desired. 
     At step  214 , the manufacturing system may fold (bend) flexible printed circuit substrates  130 ,  133 , and/or  134  in flexible printed circuit structure  132  (e.g., about at least axes  150 ,  152 ,  160 ,  158 ,  167 , and/or  154  of  FIG. 8 ). Flexible printed circuit structure  132  may hold its three-dimensional shape after folding. 
     At optional step  216 , the manufacturing system or a separate testing system may test the electromagnetic (e.g., radio-frequency) and/or mechanical performance of flexible printed circuit structure  132 . Step  216  may be omitted if desired. 
     At step  218 , flexible printed circuit structure  132  may be assembled into device  10 . Flexible printed circuit structure  132  may be mechanically secured to peripheral conductive housing structures  12 W and/or ground structures  100  ( FIG. 6 ). For example, conductive interconnect structures  170 ,  168 ,  186 ,  182 , and  190  of  FIG. 8  may be attached to peripheral conductive housing structures  12 W (e.g., using conductive screws, solder, welds, conductive adhesive, etc.) and conductive interconnect structures  174 ,  172 ,  188 , and  176  may be attached to ground structures  100  (e.g., using conductive screws, solder, welds, conductive adhesive, etc.). Radio-frequency signals may then be conveyed between transceiver circuitry  60  and antennas  40 - 1 ,  40 - 2 ,  40 - 3 ,  40 - 4 ,  40 - 5 , and  40 - 6  ( FIG. 6 ) through flexible printed circuit structure  132 . 
     The foregoing is merely illustrative and various modifications can be made by those skilled in the art without departing from the scope and spirit of the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

Metadata:
Filing Date: 20190906
Publication Date: 20210907
Grant Date: 20210907
Priority Date: 20190906
Inventors: YARGA, SALIH
AKBARZADEH, SOROUSH
LEE, JONATHAN M.
ROSE, GARETH L.
GOMEZ TAGLE, JAVIER
NICKEL, JOSHUA G.
PASCOLINI, MATTIA
SPRAGGS, IAN A.
JARVIS, DANIEL W.
SESHADRI, SUNITHA
Assignee: APPLE INC
CPC Classifications: [{"code": "H01Q5/25", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/085", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/38", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q21/28", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/38", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/241", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q5/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/085", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/241", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/25", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/38", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 74849629