PATENT DOCUMENT

Publication Number: US-11901641-B2
Application Number: US-202217694486-A
Country: US
Kind Code: B2

Title: Electronic devices with multiple low band antennas

Abstract:
An electronic device may include first and second antennas formed from respective first and second segments of a housing. The first antenna may have a first feed coupled to the first segment by a first switch and coupled to the first segment by a first conductive trace. The second antenna may have a second feed coupled to the second segment by a second switch and coupled to the second segment by a second conductive trace. The first segment may be separated from the second segment by a single gap, a data connector may pass through the second segment, and the antennas may selectively cover a low band. Alternatively, the first segment may be separated from the second segment by a third segment and two gaps, the data connector may pass through the third segment, and the first and second antennas may concurrently cover the low band.

Claims:
What is claimed is: 
     
       1. An electronic device comprising:
 ground structures; 
 peripheral conductive housing structures having a first segment and a second segment separated from the first segment by at least one dielectric-filled gap, the first and second segments being separated from the ground structures by a slot; 
 a first positive antenna feed terminal; 
 a first switch that couples the first positive antenna feed terminal to a first location on the first segment; 
 a first conductive trace that overlaps the slot and that couples the first positive antenna feed terminal to a second location on the first segment; 
 a second positive antenna feed terminal; 
 a second switch that couples the second positive antenna feed terminal to a third location on the second segment; and 
 a second conductive trace that overlaps the slot and that couples the second positive antenna feed terminal to a fourth location on the second segment. 
 
     
     
       2. The electronic device of  claim 1 , wherein the at least one dielectric-filled gap comprises a first dielectric-filled gap that defines an end of the first segment and an end of the second segment, the second location is interposed on the first segment between the first location and the first dielectric-filled gap, and the fourth location is interposed on the second segment between the third location and the first dielectric filled gap. 
     
     
       3. The electronic device of  claim 2 , wherein the second segment is longer than the first segment. 
     
     
       4. The electronic device of  claim 3 , further comprising:
 a first tuning element that couples the ground structures to a fifth location on the first segment, the fifth location being interposed on the first segment between the second location and the first dielectric-filled gap; and 
 a second tuning element that couples the ground structures to a sixth location on the second segment, the sixth location being interposed on the second segment between the fourth location and the first dielectric-filled gap. 
 
     
     
       5. The electronic device of  claim 4 , wherein the first positive antenna feed terminal, the first conductive trace, and the first segment are configured to convey radio-frequency signals in a frequency band while the second tuning element forms a short circuit impedance in the frequency band from the sixth location to the ground structures. 
     
     
       6. The electronic device of  claim 5 , wherein the second positive antenna feed terminal, the second conductive trace, and the second segment are configured to convey radio-frequency signals in the frequency band while the first tuning element forms a short circuit impedance in the frequency band from the fifth location to the ground structures. 
     
     
       7. The electronic device of  claim 6 , further comprising:
 a data connector that bridges the slot and that extends through an opening in the second segment. 
 
     
     
       8. The electronic device of  claim 6 , wherein the frequency band comprises a cellular low band having frequencies less than or equal to 960 MHz. 
     
     
       9. The electronic device of  claim 6 , further comprising:
 a third tuning element that couples the ground structures to a seventh location on the second segment, the seventh location being interposed between the sixth location and the fourth location, wherein third tuning element is configured to form a short circuit impedance in the frequency band while the first positive antenna feed terminal, the first conductive trace, and the first segment convey the radio-frequency signals in the frequency band. 
 
     
     
       10. The electronic device of  claim 4 , wherein the second tuning element has a state that configures the second segment to boost antenna efficiency of the first segment in a frequency band less than 960 MHz via a near-field electromagnetic coupling between the first and second segments across the first dielectric-filled gap. 
     
     
       11. The electronic device of  claim 4 , further comprising:
 a third segment of the peripheral conductive housing structures that is separated from the first segment by a first dielectric filled gap; 
 a fourth segment of the peripheral conductive housing structures that is separated from the second segment by a second dielectric-filled gap; 
 a third positive antenna feed terminal; 
 a third switch that couples the third positive antenna feed terminal to a seventh location on the third segment; 
 a fourth switch that couples the seventh location to an eighth location on the first segment, the eighth location being interposed on the first segment between the first location and the first dielectric-filled gap; 
 a fourth positive antenna feed terminal; 
 a fifth switch that couples the fourth positive antenna feed terminal to a ninth location on the fourth segment; and 
 a sixth switch that couples the ninth location to a tenth location on the second segment, the tenth location being interposed on the second segment between the third location and the second dielectric-filled gap. 
 
     
     
       12. The electronic device of  claim 1 , wherein the at least one dielectric-filled gap comprises a first dielectric-filled gap that separates the first segment from a third segment of the peripheral conductive housing structures and comprises a second dielectric-filled gap that separates the second segment from the third segment, the first segment has a length equal to a length of the second segment, and the electronic device further comprises a data connector that bridges the slot, extends through an opening in the third segment, and is electrically shorted to the third segment. 
     
     
       13. The electronic device of  claim 12 , further comprising:
 a first tuning element that couples the ground structures to a fifth location on the first segment, the fifth location being interposed on the first segment between the second location and the first dielectric-filled gap; and 
 a second tuning element that couples the ground structures to a sixth location on the second segment, the sixth location being interposed on the second segment between the second dielectric-filled gap. 
 
     
     
       14. The electronic device of  claim 13 , wherein the first positive antenna feed terminal, the first conductive trace, the first segment, the second positive antenna feed terminal, the second conductive trace, and the second segment are configured to concurrently convey radio-frequency signals in a cellular low band having frequencies less than or equal to 960 MHz. 
     
     
       15. An electronic device comprising:
 peripheral conductive housing structures having a dielectric-filled gap that divides the peripheral conductive housing structures into a first segment and a second segment that is longer than the first segment; 
 an antenna ground separated from the first and second segments by a slot; 
 a data connector that extends through the second segment; 
 a first positive antenna feed terminal coupled to a first point on the first segment by a first switch and coupled to a second point on the first segment by a first conductive trace that overlaps the slot, the second point being between the first point and the dielectric-filled gap; and 
 a second positive antenna feed terminal coupled to a third point on the second segment by a second switch and coupled to a fourth point on the second segment by a second conductive trace that overlaps the slot, the fourth point being between the third point and the dielectric-filled gap and the data connector being between the fourth point and the dielectric filled gap. 
 
     
     
       16. The electronic device of  claim 15 , wherein the second conductive trace is longer than the first conductive trace. 
     
     
       17. The electronic device of  claim 15 , further comprising:
 a first switchable component coupled between the antenna ground and a fifth point on the first segment, the fifth point being between the second point and the dielectric-filled gap; and 
 a second switchable component coupled between the antenna ground and a sixth point on the second segment, the sixth point being between the data connector and the dielectric-filled gap. 
 
     
     
       18. The electronic device of  claim 17 , further comprising:
 a third switchable component coupled between the antenna ground and a seventh point on the second segment, wherein the seventh point is between the fourth point and the dielectric-filled gap, and the data connector is disposed between the sixth point and the seventh point. 
 
     
     
       19. An electronic device comprising:
 peripheral conductive housing structures having a dielectric-filled gap that separates a first segment of the peripheral conductive housing structures from a second segment of the peripheral conductive housing structures; 
 ground structures separated from the first and second segments by a slot; 
 a first positive antenna feed terminal; 
 a second positive antenna feed terminal; and 
 switching circuitry, wherein the switching circuitry has
 a first state in which the first positive antenna feed terminal and the first segment are configured to convey radio-frequency signals in a frequency band while a short circuit impedance in the frequency band is formed between the second segment and the ground structures, and 
 a second state in which the second positive antenna feed terminal and the second segment are configured to convey radio-frequency signals in the frequency band while a short circuit impedance in the frequency band is formed between the first segment and the ground structures. 
 
 
     
     
       20. The electronic device of  claim 19 , further comprising:
 a first trace combiner at least partially overlapping the slot and coupled between the first positive antenna feed terminal and the first segment; and 
 a second trace combiner at least partially overlapping the slot and coupled between the second positive antenna feed terminal and the second segment.

Description:
BACKGROUND 
     This relates generally to electronic devices and, more particularly, to electronic devices with wireless communications capabilities. 
     Electronic devices such as portable computers and cellular telephones are often provided with wireless communications capabilities. To satisfy consumer demand for small form factor wireless devices, manufacturers are continually striving to implement wireless communications circuitry such as antenna components using compact structures. At the same time, there is a desire for wireless devices to cover a growing number of communications bands. 
     Because antennas have the potential to interfere with each other and with components in a wireless device, care must be taken when incorporating antennas into an electronic device. Moreover, care must be taken to ensure that the antennas and wireless circuitry in a device are able to exhibit satisfactory performance over a range of operating frequencies and with satisfactory efficiency bandwidth. 
     SUMMARY 
     An electronic device may be provided with wireless circuitry and a housing having peripheral conductive housing structures. The wireless circuitry may include first and second antennas. The first antenna may have a resonating element arm formed from a first segment of the peripheral conductive housing structures. The second antenna may have a resonating element arm formed from a second segment of the peripheral conductive housing structures. The first and second segments may be separated from ground by a slot. 
     The first antenna may have a first positive antenna feed terminal coupled to a first point on the first segment by a first switch and coupled to a second point on the first segment by a first conductive trace overlapping the slot. The second antenna may have a second positive antenna feed terminal coupled to a third point on the second segment by a second switch and coupled to a fourth point on the second segment by a second conductive trace overlapping the slot. The conductive traces may be used to feed the first and second segments in a cellular low band. In some arrangements, the first segment may be separated from the second segment by a single gap and a data connector may pass through the second segment. In these examples, only one of the first and second antennas may cover the low band at a given time. In other arrangements, the first segment may be separated from the second segment by a third segment and two gaps. In these examples, the data connector may pass through the third segment and the first and second antennas may concurrently cover the low band. 
    
    
     
       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 cross-sectional side view of an electronic device having housing structures that may be used in forming antenna structures in accordance with some embodiments. 
         FIG.  5    is a top interior view of the lower end of an illustrative electronic device having peripheral conductive housing structures with a dielectric gap for separating the resonating elements of two antennas in accordance with some embodiments. 
         FIG.  6    is a top interior view of the lower end of an illustrative electronic device having first and second antennas that are separated by a dielectric gap and that may selectively cover a cellular low band in accordance with some embodiments. 
         FIG.  7    is a top interior view of the lower end of an illustrative electronic device having peripheral conductive housing structures with first and second dielectric gaps for separating the resonating elements of two antennas in accordance with some embodiments. 
         FIG.  8    is a top interior view of the lower end of an illustrative electronic device having first and second antennas that are separated by first and second dielectric gaps and that may concurrently cover a cellular low band in accordance with some embodiments. 
         FIG.  9    is a plot showing how a first antenna may be tuned to optimize low band performance of a second antenna via near-field coupling in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     An electronic device such as electronic device  10  of  FIG.  1    may be provided with wireless circuitry that includes antennas. The antennas may be used to transmit and/or receive wireless radio-frequency signals. 
     Device  10  may be a portable electronic device or other suitable electronic device. For example, 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, headset 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 (e.g., a dielectric cover layer). 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 materials. 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. Conductive portions of 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). In other words, device  10  may have a length (e.g., measured parallel to the Y-axis), a width that is less than the length (e.g., measured parallel to the X-axis), and a height (e.g., measured parallel to the Z-axis) that is less than the width. 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, alloys, 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 ledge 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/cover 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 of display  14  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. Inactive area IA may include a recessed region such as notch  24  that extends into active area AA. Active area AA may, for example, be defined by the lateral area of a display module for display  14  (e.g., a display module that includes pixel circuitry, touch sensor circuitry, etc.). The display module may have a recess or notch in upper region  20  of device  10  that is free from active display circuitry (i.e., that forms notch  24  of inactive area IA). Notch  24  may be a substantially rectangular region that is surrounded (defined) on three sides by active area AA and on a fourth side by peripheral conductive housing structures  12 W. 
     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  in notch  24  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 conductive support plate or backplate) that spans the walls of housing  12  (e.g., a substantially rectangular sheet formed from one or more metal parts that is welded or otherwise connected between opposing sides of peripheral conductive housing structures  12 W). The conductive support plate may form an exterior rear surface of device  10  or may be covered by a dielectric cover layer such as a thin cosmetic layer, protective coating, 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 conductive support plate from view of the user (e.g., the conductive support plate may form part of rear housing wall  12 R). 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 . Region  22  may sometimes be referred to herein as lower region  22  or lower end  22  of device  10 . Region  20  may sometimes be referred to herein as upper region  20  or upper end  20  of device  10 . 
     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., at lower region  22  and/or upper region  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 dielectric-filled 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. The conductive segments that are formed in this way may form parts of antennas in device  10  if desired. Other dielectric openings may be formed in peripheral conductive housing structures  12 W (e.g., dielectric openings other than gaps  18 ) and may serve as dielectric antenna windows for antennas mounted within the interior of device  10 . Antennas within device  10  may be aligned with the dielectric antenna windows for conveying radio-frequency signals through peripheral conductive housing structures  12 W. Antennas within device  10  may also be aligned with inactive area IA of display  14  for conveying radio-frequency signals through display  14 . 
     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. An upper antenna may, for example, be formed in upper region  20  of device  10 . A lower antenna may, for example, be formed in lower region  22  of device  10 . Additional antennas may be formed along the edges of housing  12  extending between regions  20  and  22  if desired. An example in which device  10  includes three or four upper antennas and five lower antennas is described herein as an example. 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. Other antennas for covering any other desired frequencies may also be mounted at any desired locations within the interior of device  10 . The example of  FIG.  1    is merely illustrative. If desired, housing  12  may have other shapes (e.g., a square shape, cylindrical shape, spherical shape, combinations of these and/or different shapes, 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  38 . Control circuitry  38  may include storage such as storage circuitry  30 . Storage circuitry  30  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  38  may include processing circuitry such as processing circuitry  32 . Processing circuitry  32  may be used to control the operation of device  10 . Processing circuitry  32  may include on one or more microprocessors, microcontrollers, digital signal processors, host processors, baseband processor integrated circuits, application specific integrated circuits, graphics processing units, central processing units (CPUs), etc. Control circuitry  38  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  30  (e.g., storage circuitry  30  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  30  may be executed by processing circuitry  32 . 
     Control circuitry  38  may be used to run software on device  10  such as 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  38  may be used in implementing communications protocols. Communications protocols that may be implemented using control circuitry  38  include internet protocols, wireless local area network protocols (e.g., IEEE 802.11 protocols—sometimes referred to as WiFi®), protocols for other short-range wireless communications links such as the Bluetooth® protocol or other WPAN protocols, IEEE 802.11ad protocols, cellular telephone protocols, MIMO protocols, antenna diversity protocols, satellite navigation system protocols, antenna-based spatial ranging protocols (e.g., radio detection and ranging (RADAR) protocols or other desired range detection protocols for signals conveyed at millimeter and centimeter wave frequencies), etc. Each communication 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  26 . Input-output circuitry  26  may include input-output devices  28 . Input-output devices  28  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  28  may include user interface devices, data port devices, sensors, and other input-output components. For example, input-output devices may include touch screens, displays without touch sensor capabilities, buttons, joysticks, scrolling wheels, touch pads, key pads, keyboards, microphones, cameras, speakers, status indicators, light sources, audio jacks and other audio port components, digital data port devices, light sensors, gyroscopes, accelerometers or other components that can detect motion and device orientation relative to the Earth, capacitance sensors, proximity sensors (e.g., a capacitive proximity sensor and/or an infrared proximity sensor), magnetic sensors, and other sensors and input-output components. 
     Input-output circuitry  26  may include wireless circuitry such as wireless circuitry  34  for wirelessly conveying radio-frequency signals. While control circuitry  38  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  32  and/or storage circuitry that forms a part of storage circuitry  30  of control circuitry  38  (e.g., portions of control circuitry  38  may be implemented on wireless circuitry  34 ). As an example, control circuitry  38  may include baseband processor circuitry or other control components that form a part of wireless circuitry  34 . 
     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, transmission lines, and other circuitry for handling RF wireless signals. Wireless signals can also be sent using light (e.g., using infrared communications). 
     Wireless circuitry  34  may include radio-frequency transceiver circuitry  36  for handling transmission and/or reception of radio-frequency signals within corresponding frequency bands at radio frequencies (sometimes referred to herein as communications bands or simply as “bands”). The frequency bands handled by radio-frequency transceiver circuitry  36  may include wireless local area network (WLAN) frequency bands (e.g., Wi-Fi® (IEEE 802.11) or other WLAN communications bands) such as a 2.4 GHz WLAN band (e.g., from 2400 to 2480 MHz), a 5 GHz WLAN band (e.g., from 5180 to 5825 MHz), a Wi-Fi® 6E band (e.g., from 5925-7125 MHz), and/or other Wi-Fi® bands (e.g., from 1875-5160 MHz), wireless personal area network (WPAN) frequency bands such as the 2.4 GHz Bluetooth® band or other WPAN communications bands, cellular telephone communications bands such as a cellular low band (LB) (e.g., 600 to 960 MHz), a cellular low-midband (LMB) (e.g., 1400 to 1550 MHz), a cellular midband (MB) (e.g., from 1700 to 2200 MHz), a cellular high band (HB) (e.g., from 2300 to 2700 MHz), a cellular ultra-high band (UHB) (e.g., from 3300 to 5000 MHz, or other cellular communications bands between about 600 MHz and about 5000 MHz), 3G bands, 4G LTE bands, 3GPP 5G New Radio Frequency Range 1 (FR1) bands below 10 GHz, 3GPP 5G New Radio (NR) Frequency Range 2 (FR2) bands between 20 and 60 GHz, other centimeter or millimeter wave frequency bands between 10-300 GHz, near-field communications frequency bands (e.g., at 13.56 MHz), satellite navigation frequency bands such as the Global Positioning System (GPS) L1 band (e.g., at 1575 MHz), L2 band (e.g., at 1228 MHz), L3 band (e.g., at 1381 MHz), L4 band (e.g., at 1380 MHz), and/or L5 band (e.g., at 1176 MHz), a Global Navigation Satellite System (GLONASS) band, a BeiDou Navigation Satellite System (BDS) band, ultra-wideband (UWB) frequency bands that operate under the IEEE 802.15.4 protocol and/or other ultra-wideband communications protocols (e.g., a first UWB communications band at 6.5 GHz and/or a second UWB communications band at 8.0 GHz), communications bands under the family of 3GPP wireless communications standards, communications bands under the IEEE 802.XX family of standards, satellite communications bands such as an L-band, S-band (e.g., from 2-4 GHz), C-band (e.g., from 4-8 GHz), X-band, Ku-band (e.g., from 12-18 GHz), Ka-band (e.g., from 26-40 GHz), etc., industrial, scientific, and medical (ISM) bands such as an ISM band between around 900 MHz and 950 MHz or other ISM bands below or above 1 GHz, one or more unlicensed bands, one or more bands reserved for emergency and/or public services, and/or any other desired frequency bands of interest. Wireless circuitry  34  may also be used to perform spatial ranging operations if desired. 
     The UWB communications handled by radio-frequency transceiver circuitry  36  may be based on an impulse radio signaling scheme that uses band-limited data pulses. Radio-frequency signals in the UWB frequency band 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 signals to penetrate through objects such as walls. In an IEEE 802.15.4 system, for example, 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). 
     Radio-frequency transceiver circuitry  36  may include respective transceivers (e.g., transceiver integrated circuits or chips) that handle each of these frequency bands or any desired number of transceivers that handle two or more of these frequency bands. In scenarios where different transceivers are coupled to the same antenna, filter circuitry (e.g., duplexer circuitry, diplexer circuitry, low pass filter circuitry, high pass filter circuitry, band pass filter circuitry, band stop filter circuitry, etc.), switching circuitry, multiplexing circuitry, or any other desired circuitry may be used to isolate radio-frequency signals conveyed by each transceiver over the same antenna (e.g., filtering circuitry or multiplexing circuitry may be interposed on a radio-frequency transmission line shared by the transceivers). Radio-frequency transceiver circuitry  36  may include one or more integrated circuits (chips), integrated circuit packages (e.g., multiple integrated circuits mounted on a common printed circuit in a system-in-package device, one or more integrated circuits mounted on different substrates, etc.), power amplifier circuitry, up-conversion circuitry, down-conversion circuitry, low-noise input amplifiers, passive radio-frequency components, switching circuitry, transmission line structures, and other circuitry for handling radio-frequency signals and/or for converting signals between radio-frequencies, intermediate frequencies, and/or baseband frequencies. 
     In general, radio-frequency transceiver circuitry  36  may cover (handle) any desired frequency bands of interest. As shown in  FIG.  2   , wireless circuitry  34  may include antennas  40 . Radio-frequency transceiver circuitry  36  may convey radio-frequency signals using one or more antennas  40  (e.g., antennas  40  may convey the radio-frequency signals for the transceiver circuitry). The term “convey radio-frequency signals” as used herein means the transmission and/or reception of the radio-frequency signals (e.g., for performing unidirectional and/or bidirectional wireless communications with external wireless communications equipment). Antennas  40  may transmit the radio-frequency signals by radiating the radio-frequency signals into free space (or to freespace through intervening device structures such as a dielectric cover layer). Antennas  40  may additionally or alternatively receive the radio-frequency signals from free space (e.g., through intervening devices structures such as a dielectric cover layer). The transmission and reception of radio-frequency signals by antennas  40  each involve the excitation or resonance of antenna currents on an antenna resonating element in the antenna by the radio-frequency signals within the frequency band(s) of operation of the antenna. 
     Antennas  40  in wireless circuitry  34  may be formed using any suitable antenna types. For example, antennas  40  may include antennas with resonating elements that are formed from stacked patch antenna structures, loop antenna structures, patch antenna structures, inverted-F antenna structures, slot antenna structures, planar inverted-F antenna structures, waveguide structures, monopole antenna structures, dipole antenna structures, helical antenna structures, Yagi (Yagi-Uda) antenna structures, hybrids of these designs, etc. If desired, antennas  40  may include antennas with dielectric resonating elements such as dielectric resonator antennas. If desired, one or more of antennas  40  may be cavity-backed antennas. Two or more antennas  40  may be arranged in a phased antenna array if desired (e.g., for conveying centimeter and/or millimeter wave signals within a signal beam formed in a desired beam pointing direction that may be steered/adjusted over time). Different types of antennas may be used for different bands and combinations of bands. 
       FIG.  3    is a schematic diagram showing how a given antenna  40  may be fed by radio-frequency transceiver circuitry  36 . As shown in  FIG.  3   , antenna  40  may have a corresponding antenna feed  50 . Antenna  40  may include an antenna resonating (radiating) element and an antenna ground. Antenna feed  50  may include a positive antenna feed terminal  52  coupled to the antenna resonating element and a ground antenna feed terminal  44  coupled to the antenna ground. 
     Radio-frequency transceiver circuitry  36  may be coupled to antenna feed  50  using a radio-frequency transmission line path  42  (sometimes referred to herein as transmission line path  42 ). Transmission line path  42  may include a signal conductor such as signal conductor  46  (e.g., a positive signal conductor). Transmission line path  42  may include a ground conductor such as ground conductor  48 . Ground conductor  48  may be coupled to ground antenna feed terminal  44  of antenna feed  50 . Signal conductor  46  may be coupled to positive antenna feed terminal  52  of antenna feed  50 . 
     Transmission line path  42  may include one or more radio-frequency transmission lines. The radio-frequency transmission line(s) in transmission line path  42  may include stripline transmission lines (sometimes referred to herein simply as striplines), coaxial cables, coaxial probes realized by metalized vias, microstrip transmission lines, edge-coupled microstrip transmission lines, edge-coupled stripline transmission lines, waveguide structures, combinations of these, etc. Multiple types of radio-frequency transmission line may be used to form transmission line path  42 . Filter circuitry, switching circuitry, impedance matching circuitry, phase shifter circuitry, amplifier circuitry, and/or other circuitry may be interposed on transmission line path  42 , if desired. One or more antenna tuning components for adjusting the frequency response of antenna  40  in one or more bands may be interposed on transmission line path  42  and/or may be integrated within antenna  40  (e.g., coupled between the antenna ground and the antenna resonating element of antenna  40 , coupled between different portions of the antenna resonating element of antenna  40 , etc.). 
     If desired, one or more of the radio-frequency transmission lines in transmission line path  42  may be integrated into ceramic substrates, rigid printed circuit boards, and/or flexible printed circuits. In one suitable arrangement, the radio-frequency transmission lines may be 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) that may be folded or bent in multiple dimensions (e.g., two or three dimensions) and that 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 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). 
     If desired, conductive electronic device structures such as conductive portions of housing  12  ( FIG.  1   ) may be used to form at least part of one or more of the antennas  40  in device  10 .  FIG.  4    is a cross-sectional side view of device  10 , showing illustrative conductive electronic device structures that may be used in forming one or more of the antennas  40  in device  10 . 
     As shown in  FIG.  4   , peripheral conductive housing structures  12 W may extend around the lateral periphery of device  10  (e.g., as measured in the X-Y plane of  FIG.  1   ). Peripheral conductive housing structures  12 W may extend from rear housing wall  12 R (e.g., at the rear face of device  10 ) to display  14  (e.g., at the front face of device  10 ). In other words, peripheral conductive housing structures  12 W may form conductive sidewalls for device  10 , a first of which is shown in the cross-sectional side view of  FIG.  4    (e.g., a given sidewall that runs along an edge of device  10  and that extends across the width or length of device  10 ). 
     Display  14  may have a display module such as display module  62  (sometimes referred to as a display panel). Display module  62  may include pixel circuitry, touch sensor circuitry, force sensor circuitry, and/or any other desired circuitry for forming active area AA of display  14 . Display  14  may include a dielectric cover layer such as display cover layer  64  that overlaps display module  62 . Display cover layer  64  may include plastic, glass, sapphire, ceramic, and/or any other desired dielectric materials. Display module  62  may emit image light and may receive sensor input (e.g., touch and/or force sensor input) through display cover layer  64 . Display cover layer  64  and display  14  may be mounted to peripheral conductive housing structures  12 W. The lateral area of display  14  that does not overlap display module  62  may form inactive area IA of display  14 . 
     As shown in  FIG.  4   , rear housing wall  12 R may be mounted to peripheral conductive housing structures  12 W (e.g., opposite display  14 ). Rear housing wall  12 R may include a conductive layer such as conductive support plate  58 . Conductive support plate  58  may extend across an entirety of the width of device  10  (e.g., between the left and right edges of device  10  as shown in  FIG.  1   ). Conductive support plate  58  may have an edge  54  that is separated from peripheral conductive housing structures  12 W by dielectric-filled slot  60  (sometimes referred to herein as opening  60 , gap  60 , or aperture  60 ). Slot  60  may be filled with air, plastic, ceramic, or other dielectric materials. Conductive support plate  58  may, if desired, provide structural and mechanical support for device  10 . 
     If desired, rear housing wall  12 R may include a dielectric cover layer such as dielectric cover layer  56 . Dielectric cover layer  56  may include glass, plastic, sapphire, ceramic, one or more dielectric coatings, or other dielectric materials. Dielectric cover layer  56  may be layered under conductive support plate  58  (e.g., conductive support plate  58  may be coupled to an interior surface of dielectric cover layer  56 ). If desired, dielectric cover layer  56  may extend across an entirety of the width of device  10  and/or an entirety of the length of device  10 . Dielectric cover layer  56  may overlap slot  60 . If desired, dielectric cover layer  56  be provided with pigmentation and/or an opaque masking layer (e.g., an ink layer) that helps to hide the interior of device  10  from view. In another suitable arrangement, dielectric cover layer  56  may be omitted and slot  60  may be filled with a solid dielectric material. 
     Conductive housing structures such as conductive support plate  58  and/or peripheral conductive housing structures  12 W (e.g., the portion of peripheral conductive housing structures  12 W opposite conductive support plate  58  at slot  60 ) may be used to form antenna structures for one or more of the antennas  40  in device  10 . For example, conductive support plate  58  may be used to form the ground plane for one or more of the antennas  40  in device  10  and/or to form one or more edges of slot antenna resonating elements (e.g., slot antenna resonating elements formed from slot  60 ) for the antennas  40  in device  10 . Peripheral conductive housing structures  12 W may form an antenna resonating element arm (e.g., an inverted-F antenna resonating element arm) for one or more of the antennas  40  in device  10 . If desired, a portion of peripheral conductive housing structures  12 W and/or a portion of conductive support plate  58  (e.g., at edge  54  of slot  60 ) may form part of a conductive loop path used to form a loop antenna resonating element for antenna  40  that conveys radio-frequency signals in an NFC band. 
     If desired, device  10  may include multiple slots  60  and peripheral conductive housing structures  12 W may include multiple dielectric gaps that divide the peripheral conductive housing structures into segments (e.g., dielectric gaps  18  of  FIG.  1   ).  FIG.  5    is a top interior view showing how the lower end of device  10  (e.g., within region  22  of  FIG.  1   ) may include a slot  60  and may include multiple dielectric gaps that divide the peripheral conductive housing structures into segments for forming multiple antennas. Display  14  and other internal components have been removed from the view shown in  FIG.  5    for the sake of clarity. 
     As shown in  FIG.  5   , peripheral conductive housing structures  12 W may include a first conductive sidewall at the left edge of device  10 , a second conductive sidewall at the top edge of device  10  (not shown in  FIG.  5   ), a third conductive sidewall at the right edge of device  10 , and a fourth conductive sidewall at the bottom edge of device  10  (e.g., in an example where device  10  has a substantially rectangular lateral shape). Peripheral conductive housing structures  12 W may be segmented by dielectric-filled gaps  18  such as a first gap  18 - 1 , a second gap  18 - 2 , and a third gap  18 - 3 . Gaps  18 - 1 ,  18 - 2 , and  18 - 3  may be filled with plastic, ceramic, sapphire, glass, epoxy, or other dielectric materials. The dielectric material in the gaps may lie flush with peripheral conductive housing structures  12 W at the exterior surface of device  10  if desired. 
     Gap  18 - 1  may divide the first conductive sidewall to separate segment  66  of peripheral conductive housing structures  12 W from segment  68  of peripheral conductive housing structures  12 W. Gap  18 - 2  may divide the third conductive sidewall to separate segment  72  from segment  70  of peripheral conductive housing structures  12 W. Gap  18 - 3  may divide the fourth conductive sidewall to separate segment  68  from segment  70  of peripheral conductive housing structures  12 W. In this example, segment  68  forms the bottom-left corner of device  10  (e.g., segment  68  may have a bend at the corner) and is formed from the first and fourth conductive sidewalls of peripheral conductive housing structures  12 W (e.g., in lower region  22  of  FIG.  1   ). Segment  70  forms the bottom-right corner of device  10  (e.g., segment  70  may have a bend at the corner) and is formed from the third and fourth conductive sidewalls of peripheral conductive housing structures  12 W (e.g., in lower region  22  of  FIG.  1   ). 
     Device  10  may include ground structures  78  (e.g., structures that form part of the antenna ground for one or more of the antennas in device  10 ). Ground structures  78  may include one or more metal layers such as a metal layer used to form a rear housing wall and/or an internal support structure for device  10  (e.g., conductive support plate  58  of  FIG.  4   ), conductive traces on a printed circuit board, conductive portions of one or more components in device  10 , conductive portions of display module  62  ( FIG.  4   ), conductive interconnect structures that couple two or more of these structures together (e.g., conductive pins, conductive adhesive, welds, conductive tape, conductive foam, conductive springs, etc.), etc. 
     Ground structures  78  may extend between opposing sidewalls of peripheral conductive housing structures  12 W. For example, ground structures  78  may extend from segment  66  to segment  72  of peripheral conductive housing structures  12 W (e.g., across the width of device  10 , parallel to the X-axis of  FIG.  5   ). Ground structures  78  may be welded or otherwise affixed to segments  66  and  72 . In another suitable arrangement, some or all of ground structures  78 , segment  66 , and segment  72  may be formed from a single, integral (continuous) piece of machined metal (e.g., in a unibody configuration). Ground structures  78  may include a ground extension  74  that protrudes into slot  60  and that may, if desired, bridge slot  60  and couple the ground structures to the peripheral conductive housing structures. Ground extension  74  may be formed from a data connector for device  10 . Device  10  may have a longitudinal axis  76  that bisects the width of device  10  and that runs parallel to the length of device  10  (e.g., parallel to the Y-axis). 
     As shown in  FIG.  5   , slot  60  may separate ground structures  78  from segments  68  and  70  of peripheral conductive housing structures  12 W (e.g., the upper edge of slot  60  may be defined by ground structures  78  whereas the lower edge of slot  60  is defined by segments  68  and  70 ). Slot  60  may have an elongated shape extending from a first end at gap  18 - 1  to an opposing second end at gap  18 - 2  (e.g., slot  60  may span the width of device  10 ). Slot  60  may be filled with air, plastic, glass, sapphire, epoxy, ceramic, or other dielectric material. Slot  60  may be continuous with gaps  18 - 1 ,  18 - 2 , and  18 - 3  in peripheral conductive housing structures  12 W if desired (e.g., a single piece of dielectric material may be used to fill both slot  60  and gaps  18 - 1 ,  18 - 2 , and  18 - 3 ). 
     Ground structures  78 , segment  66 , segment  68 , segment  70 , and portions of slot  60  may be used in forming multiple antennas  40  in the lower region of device  10  (sometimes referred to herein as lower antennas). For example, device  10  may include a first antenna  40 - 1  having an antenna resonating (radiating) element formed from segment  68  and having an antenna ground formed from ground structures  78 , device  10  may include a second antenna  40 - 2  having an antenna resonating element formed from segment  70  and having an antenna ground formed from ground structures  78 , may have a third antenna  40 - 3  having a slot antenna resonating element formed from a portion of slot  60  between segment  66  and ground structures  78 , and may have a fourth antenna  40 - 4  having a slot antenna resonating element formed from a portion of slot  60  between segment  72  and ground structures  78 . Antennas  40 - 1  and  40 - 2  may be, for example, inverted-F antennas having a return path that couples the respective resonating element arms to the antenna ground. Antennas  40 - 1 ,  40 - 2 ,  40 - 3 , and  40 - 4  may convey radio-frequency signals in one or more frequency bands. For example, antennas  40 - 1  and  40 - 2  may convey radio-frequency signals in at least the cellular low band, the cellular midband, and the cellular high band. This may allow antennas  40 - 1  and  40 - 2  to perform MIMO communications in one or more of these bands, thereby maximizing data throughput. 
     In the example of  FIG.  5   , segment  68  has less overall length than segment  70  (e.g., longitudinal axis  76  of device  10  runs through segment  70  but not segment  68 ). It can therefore be difficult to configure antenna  40 - 1  to cover relatively low frequencies with the same antenna efficiency as antenna  40 - 2 , such as frequencies within the cellular low band. In addition, ground extension  74  may have a relatively large size, such as in scenarios where ground extension  74  is formed from a relatively large data connector such as a data connector that supports data transfer using a USB-C protocol (e.g., a USB-C connector or port). The presence of ground extension  74  may also make it difficult for one or both of antennas  40 - 1  and  40 - 2  to cover the cellular low band. 
       FIG.  6    is an interior view showing how antennas  40 - 1  and  40 - 2  may be configured to overcome these challenges to both cover relatively low frequencies such as frequencies within the cellular low band. As shown in  FIG.  6   , antenna  40 - 1  may have an antenna resonating element arm formed from segment  68  of peripheral conductive housing structures  12 W. Antenna  40 - 1  may be fed using an antenna feed  50 - 1  coupled across slot  60 . Antenna feed  50 - 1  may have a positive antenna feed terminal  52 - 1  coupled to segment  68  and may have a ground antenna feed terminal  44 - 1  coupled to ground structures  78 . Positive antenna feed terminal  52 - 1  may be switchably coupled to point (terminal)  94  on segment  68  by a switching circuit such as switch  114 . Antenna  40 - 1  may have a return path formed from switchable component  116  coupled between point (terminal)  132  on ground structures  78  and point (terminal)  98  on segment  68 . Switchable component  116  may sometimes be referred to herein as an adjustable component or a tuning element. Point  98  may be located at or adjacent to dielectric gap  18 - 3 , for example. Switchable component  116  may include one or more switches, inductors, resistors, and/or capacitors. 
     Slot  60  may include a vertical portion that extends parallel to longitudinal axis  76  (e.g., the Y-axis of  FIG.  6   ) and beyond gap  18 - 1 . As shown in  FIG.  6   , slot  60  may include an extended (elongated) portion  126 . Extended portion  126  of slot  60  may extend between segment  66  and ground structures  78  (e.g., segment  66  and ground structures  78  may define opposing edges of extended portion  126 ), parallel to longitudinal axis  76  and the Y-axis. Extended portion  126  of slot  60  may have an open end at gap  18 - 1  and an opposing closed end formed from ground structures  78 . Extended portion  126  of slot  60  may sometimes be referred to herein simply as slot  126 . Slot  126  may form a slot antenna resonating element for antenna  40 - 3 . Antenna  40 - 3  may be fed by antenna feed  50 - 3  coupled across slot  126 . Antenna feed  50 - 3  may include a positive antenna feed terminal  52 - 3  coupled to segment  66  and a ground antenna feed terminal  44 - 3  coupled to ground structures  78 . 
     Positive antenna feed terminal  52 - 3  may be switchably coupled to point (terminal)  90  on segment  66  by a switching circuit such as switch  110 . Point  90  may be located at or adjacent to gap  18 - 1 . Point  90  may also be coupled to point (terminal)  92  on segment  68  via a switching circuit such as switch  112  (e.g., switch  112  may bridge gap  18 - 1 ). Point  92  may be located at or adjacent to gap  18 - 1 . Switch  110  may be opened (e.g., turned off to create an open circuit or infinite impedance between positive antenna feed terminal  52 - 3  and both points  90  and  92 ) to deactivate antenna feed  50 - 3  and antenna  40 - 3 . When switch  110  is opened, switch  112  may be closed (e.g., turned off to create a short circuit impedance between points  92  and  90 ) to extend the radiating volume of antenna  40 - 1  to include at least some of slot  126 , if desired. Switch  112  may, for example, be toggled to tune the frequency response of antenna  40 - 1  in one or more bands. When switch  110  is closed, antenna feed  50 - 3  and antenna  40 - 3  may be active to radiate in one or more frequency bands. If desired, switch  112  may be opened when switch  110  is closed. Switch  110  and/or switch  112  may include one or more inductive, resistive, capacitive, and/or switches arranged in any desired manner for tuning the frequency response of antennas  40 - 1  and/or  40 - 3 , if desired. 
     While positive antenna feed terminal  52 - 1  is coupled to a first location on segment  68  (e.g., point  94 ) via switch  114 , positive antenna feed terminal  52 - 1  may also be coupled to a second location on segment  68  such as point (terminal)  96  via conductive trace  84 - 1  overlapping slot  60 . The structure of antennas  40 - 2  and  40 - 4  may mirror the structure of antennas  40 - 1  and  40 - 3  about longitudinal axis  76 , respectively, despite the fact that segment  70  is longer than segment  68 . As shown in  FIG.  6   , antenna  40 - 2  may have an antenna resonating element arm formed from segment  70  of peripheral conductive housing structures  12 W. Antenna  40 - 2  may be fed using an antenna feed  50 - 2  coupled across slot  60 . Antenna feeds  50 - 2  and  50 - 1  may be coupled to and fed by respective transmission lines (e.g., transmission line  42  of  FIG.  3   ). Antenna feed  50 - 2  may have a positive antenna feed terminal  52 - 2  coupled to segment  70  and may have a ground antenna feed terminal  44 - 2  coupled to ground structures  78 . Positive antenna feed terminal  52 - 2  may be switchably coupled to point (terminal)  104  on segment  70  by a switching circuit such as switch  120 . Antenna  40 - 2  may have one or more return paths such as a first return path formed from switchable component  118  coupled between point (terminal)  134  on ground structures  78  and point (terminal)  100  on segment  68  and optionally a second return path formed from switchable component  138  coupled between point (terminal)  136  on ground structures  78  and point (terminal)  130  on segment  70 . Switchable components  118  and  138  may sometimes be referred to herein as adjustable components or tuning elements. Switchable components  116  and  138  may include one or more switches, inductors, resistors, and/or capacitors. Point  100  may be located at or adjacent to gap  18 - 3 , for example. 
     A data connector such as data connector  80  may pass over slot  60  and through an opening in segment  70  (e.g., at the exterior of the device). Data connector  80  may be used to receive a mating data connector to charge a battery on device  10  and/or to convey data between device  10  and an external device. Data connector  80  may be a USB-C connector, for example. Points  100  and  130  may be located on opposing sides of data connector  80 , for example. Longitudinal axis  76  of device  10  may pass through (e.g., bisect) data connector  80 . 
     Slot  60  may include a vertical portion that extends parallel to longitudinal axis  76  (e.g., the Y-axis of  FIG.  6   ) and beyond gap  18 - 2 . As shown in  FIG.  6   , slot  60  may include an extended (elongated) portion  128 . Extended portion  128  of slot  60  may extend between segment  72  and ground structures  78  (e.g., segment  72  and ground structures  78  may define opposing edges of extended portion  128 ), parallel to longitudinal axis  76  and the Y-axis. Extended portion  128  of slot  60  may have an open end at gap  18 - 2  and an opposing closed end formed from ground structures  78 . Extended portion  128  of slot  60  may sometimes be referred to herein simply as slot  128 . Slot  128  may form a slot antenna resonating element for antenna  40 - 4 . Antenna  40 - 4  may be fed by antenna feed  50 - 4  coupled across slot  128 . Antenna feed  50 - 4  may include a positive antenna feed terminal  52 - 4  coupled to segment  72  and a ground antenna feed terminal  44 - 4  coupled to ground structures  78 . 
     Positive antenna feed terminal  52 - 4  may be switchably coupled to point (terminal)  108  on segment  72  by a switching circuit such as switch  124 . Point  108  may be located at or adjacent to gap  18 - 2 . Point  108  may also be coupled to point (terminal)  106  on segment  70  via a switching circuit such as switch  122  (e.g., switch  122  may bridge gap  18 - 2 ). Point  106  may be located at or adjacent to gap  18 - 2 . Switch  124  may be opened to deactivate antenna feed  50 - 4  and antenna  40 - 4 . When switch  124  is opened, switch  122  may be closed to extend the radiating volume of antenna  40 - 2  to include at least some of slot  128 , if desired. Switch  122  may, for example, be toggled to tune the frequency response of antenna  40 - 2  in one or more bands. When switch  124  is closed, antenna feed  50 - 4  and antenna  40 - 4  may be active to radiate in one or more frequency bands. If desired, switch  122  may be opened when switch  124  is closed. Switch  124  and/or switch  122  may include one or more inductive, resistive, capacitive, and/or switches arranged in any desired manner for tuning the frequency response of antennas  40 - 2  and/or  40 - 4 , if desired. 
     While positive antenna feed terminal  52 - 2  is coupled to a first location on segment  70  (e.g., point  104 ) via switch  120 , positive antenna feed terminal  52 - 2  may also be coupled to a second location on segment  70  such as point (terminal)  102  via conductive trace  84 - 2  overlapping slot  60 . The length of the resonating element arm of antenna  40 - 2  (segment  70 ) may be selected so that antenna  40 - 2  radiates at desired operating frequencies such as frequencies in a cellular low band (e.g., a frequency band between about 600 MHz and 960 MHz), a cellular low-midband (e.g., a frequency band between about 1410 MHz and 1510 MHz), a cellular midband (e.g., a frequency band between about 1710 MHz and 2170 MHz), and/or a cellular ultra-high band (e.g., a frequency band between about 3400 MHz and 3600 MHz). 
     For example, the length of segment  70  extending from point  104  to gap  18 - 3  and/or the length of segment  70  extending from point  104  to gap  18 - 2  may be selected to cover frequencies in the cellular low-midband, the cellular midband, the cellular high band, and/or the cellular ultra-high band (e.g., in a fundamental and/or harmonic mode(s)). In the fundamental mode, these lengths may be approximately equal to one-quarter of the wavelength corresponding to a frequency in the frequency band of interest (e.g., where the wavelength is an effective wavelength that accounts for dielectric loading by the dielectric materials in slot  60 ). Antenna  40 - 2  may cover these bands when switch  120  is closed to couple positive antenna feed terminal  52 - 2  to point  104 , for example. If desired, switch  120  may decouple positive antenna feed terminal  52 - 2  from conductive trace  84 - 2  when coupling positive antenna feed terminal  52 - 2  to point  104 . 
     The length of segment  70  between gaps  18 - 3  and  18 - 2  (or some subset thereof) may be selected to cover relatively low frequencies such as frequencies in the cellular low band. For example, this length may be selected to be approximately equal to one-quarter of the effective wavelength corresponding to a frequency in the cellular low band. Feeding antenna  40 - 2  at point  104  (e.g., by closing switch  120 ) may limit the length of segment  70  that is available to cover the low band. In addition, operations at relatively low frequencies such as frequencies in the low band may be particularly susceptible to loading by data connector  80 , which is relatively large. This may limit antenna efficiency at frequencies in the low band. Such undesirable loading may be mitigated by using portions of segment  70  that are located farther from data connector  80  and gap  18 - 3  to cover the low band. 
     To optimize performance within the low band, switch  120  may be opened and positive antenna feed terminal  52 - 2  may be coupled to point  102  via conductive trace  84 - 2 . Segment  70  may then be fed via conductive trace  84 - 2  at point  102 . Point  102  may therefore sometimes be referred to herein as a positive antenna feed terminal when switch  120  is open. Opening switch  120  to couple positive antenna feed terminal  52 - 2  to point  102  may serve to shift electromagnetic hotspots in the cellular low band away from gap  18 - 3  and data connector  80  and towards gap  18 - 2 . This may serve to minimize loading in the low band by data connector  80 , as well as by external objects such as the user&#39;s body, thereby maximizing antenna efficiency in the low band. Switchable components  118  and/or  138  may be adjusted to tune the frequency response of antenna  40 - 2  in the low band. 
     In some scenarios, point  102  may be directly fed using a dedicated transmission line other than the transmission line coupled to antenna feed  50 - 2 . However, use of a separate transmission line and the corresponding switching circuitry can undesirably attenuate the radio-frequency signals conveyed by the antenna. This attenuation may be eliminated by using the same radio-frequency transmission line to convey signals to both points  104  and  102  via positive antenna feed terminal  52 - 2 . At the same time, point  102  is located relatively far from the transmission line for antenna  40 - 2 . If care is not taken, the relatively long conductive path length from the transmission line to point  102  may introduce excessive inductance between the transmission line and point  102  when covering the low band. This inductance may undesirably limit the antenna efficiency for antenna  40 - 4  in the low band when switch  120  is open. 
     To minimize the inductance between point  102  and the transmission line coupled to positive antenna feed terminal  52 - 2 , conductive trace  84 - 2  may have a relatively large width  82 . In general, larger (wider) widths  82  may reduce the inductance between the transmission line and point  102  more than shorter (narrower) widths  82 . At the same time, width  82  may be limited by the amount of space available between ground structures  78  and segment  70  (e.g., the width of slot  60 ). As examples, width  82  may be between 2.0 mm and 2.3 mm, between 2.5 mm and 2.9 mm, approximately 2.7 mm, between 1 mm and 4 mm, or any other desired width that balances a reduction in inductance with the amount of available space within slot  60 . The length of conductive trace  84 - 2  (e.g., as measured perpendicular to width  82 ) may be approximately 20 mm, between 15 mm and 25 mm, between 10 mm and 20 mm, or any other desired length. The ratio of the length of conductive trace  84 - 2  to width  82  may be between 3 and 10, between 2 and 10, between 5 and 15, between 6 and 10, between 5 and 9, or any other desired ratio, as examples. 
     Conductive trace  84 - 2  may be located at a distance  88  from segment  70  and at a distance  86  from ground structures  78  (e.g., conductive trace  84 - 2  may be separated from ground structures  78  by a first portion of slot  60  and may be separated from segment  70  by a second portion of slot  60 ). Distance  88  may be shorter than distance  86  if desired. Distance  88  may be selected to allow conductive trace  84 - 2  to form a distributed capacitance with segment  70  such that when switch  120  is closed (e.g., when positive antenna feed terminal  52 - 2  is shorted to point  104 ), conductive trace  84 - 2  electrically forms a single integral conductor with segment  70 . When switch  120  is open (e.g., when positive antenna feed terminal  52 - 2  feeds point  102  via conductive trace  84 - 2 ), conductive trace  84 - 2  electrically forms an inductor that is coupled in series between positive antenna feed terminal  52 - 2  and point  102  and that has an inductance that is lower than in scenarios where a conductive line or wire is used to connect positive antenna feed terminal  52 - 2  to point  102 . As examples, distance  86  may be approximately 1.0 mm, between 0.8 mm and 1.2 mm, between 0.6 and 1.4 mm, or any other desired distance. Distance  88  may be approximately 0.5 mm, between 0.3 mm and 0.7 mm, between 0.2 mm and 0.8 mm, between 0.6 mm and 0.1 mm, or any other desired distance that is less than distance  86 . 
     Conductive trace  84 - 2  may be formed on the dielectric material that is used to fill slot  60  (e.g., dielectric material that forms part of the exterior of device  10 ) or may be formed on a dielectric substrate mounted within slot  60  (e.g., a plastic block, flexible printed circuit, rigid printed circuit board, dielectric portions of other device components, etc.). Conductive trace  84 - 2  may be formed using other conductive structures such as stamped sheet metal, metal foil, integral portions of the housing for device  10 , and/or any other desired conductive structures. The example of  FIG.  6    is merely illustrative. If desired, conductive trace  84 - 2  may have other shapes (e.g., shapes following straight or meandering paths and having curved and/or straight edges). 
     When configured in this way, conductive trace  84 - 2  may form a relatively low-inductance feed line combiner (sometimes referred to as a feed combiner or trace combiner) that allows points  102  and  104  to share the same positive antenna feed terminal  52 - 2  and thus the same signal conductor of the same transmission line without sacrificing antenna efficiency even though points  102  and  104  are located relatively far apart. Conductive trace  84 - 2  may sometimes be referred to herein as feed combiner trace  84 - 2 , low inductance trace  84 - 2 , low inductance feed combiner trace  84 - 2 , low inductance feed line combiner trace  84 - 2 , fat trace  84 - 2 , thick trace  84 - 2 , wide trace  84 - 2 , low inductance path  84 - 2 , low inductance feed combiner structure  84 - 2 , or feed line inductance limiting structure  84 - 2 . 
     Similarly, in antenna  40 - 1 , the length of segment  68  extending from point  94  to gap  18 - 3  and/or the length of segment  68  extending from point  94  to gap  18 - 1  may be selected to cover frequencies in the cellular low-midband, the cellular midband, the cellular high band, and/or the cellular ultra-high band (e.g., in a fundamental and/or harmonic mode(s)). Antenna  40 - 1  may cover these bands when switch  114  is closed to couple positive antenna feed terminal  52 - 1  to point  94 , for example. If desired, switch  114  may decouple positive antenna feed terminal  52 - 1  from conductive trace  84 - 1  when coupling positive antenna feed terminal  52 - 1  to point  94 . 
     To increase the effective length of the antenna resonating element arm in antenna  40 - 1  despite the fact that segment  68  is shorter than segment  70  in the example of  FIG.  6   , the length from positive antenna feed terminal  52 - 1  through conductive trace  84 - 1  to point  96  plus the length from point  96  to gap  18 - 1  may form the antenna resonating element arm for antenna  40 - 1  in the low band. This length may therefore be selected to cover frequencies in the low band. Switch  114  may be opened to decouple positive antenna feed terminal  52 - 1  from point  94  when covering the low band, for example. Switchable component  116  may be adjusted to tune the frequency response of antenna  40 - 1  in the cellular low band, if desired. When covering the low band, segment  68  may then be fed via conductive trace  84 - 1  at point  96 . Point  96  may therefore sometimes be referred to herein as a positive antenna feed terminal when switch  114  is open. Opening switch  114  to couple positive antenna feed terminal  52 - 1  to point  96  may serve to shift electromagnetic hotspots in the cellular low band away from gap  18 - 3  and data connector  80  and towards gap  18 - 1 . This may serve to minimize loading in the low band by data connector  80 , as well as by external objects such as the user&#39;s body, thereby maximizing antenna efficiency in the low band. 
     To minimize the inductance between point  96  and the transmission line coupled to positive antenna feed terminal  52 - 1 , conductive trace  84 - 1  may have a relatively large width  82 , may be separated from ground structures  78  by a relatively large distance such as distance  86 , and may be separated from segment  68  by a relatively small distance such as distance  88 . Conductive trace  84 - 1  may be formed on the dielectric material that is used to fill slot  60  (e.g., dielectric material that forms part of the exterior of device  10 ) or may be formed on a dielectric substrate mounted within slot  60  (e.g., a plastic block, flexible printed circuit, rigid printed circuit board, dielectric portions of other device components, etc.). Conductive trace  84 - 1  may be formed using other conductive structures such as stamped sheet metal, metal foil, integral portions of the housing for device  10 , and/or any other desired conductive structures. The example of  FIG.  6    is merely illustrative. If desired, conductive trace  84 - 1  may have other shapes (e.g., shapes following straight or meandering paths and having curved and/or straight edges). 
     When configured in this way, conductive trace  84 - 1  may form a relatively low-inductance feed line combiner (sometimes referred to as a feed combiner or trace combiner) that allows points  94  and  96  to share the same positive antenna feed terminal  52 - 1  and thus the same signal conductor of the same transmission line without sacrificing antenna efficiency even though points  94  and  96  are located relatively far apart. Conductive trace  84 - 1  may sometimes be referred to herein as feed combiner trace  84 - 1 , low inductance trace  84 - 1 , low inductance feed combiner trace  84 - 1 , low inductance feed line combiner trace  84 - 1 , fat trace  84 - 1 , thick trace  84 - 1 , wide trace  84 - 1 , low inductance path  84 - 1 , low inductance feed combiner structure  84 - 1 , or feed line inductance limiting structure  84 - 1 . 
     The presence of data connector  80  at segment  70  may limit device  10  to using only one of antenna  40 - 1  or  40 - 2  to cover the low band at any given time. While switch  114  is shown only as coupling positive antenna feed terminal  52 - 1  and conductive trace  84 - 1  to point  94  in  FIG.  6    for the sake of clarity, switch  114  may also have a state in which switch  114  forms a short circuit path from point  94  to ground structures  78  at frequencies in the low band. When antenna  40 - 2  is actively covering the low band (e.g., while switch  120  is open or otherwise coupling positive antenna feed terminal  52 - 2  to point  102  via conductive trace  84 - 2 ), switchable component  116  and/or switch  114  in antenna  40 - 1  and may be controlled to form short circuit paths to ground at frequencies in the low band, as shown by arrows  140 . This may effectively kill any low band resonance of antenna  40 - 1  while antenna  40 - 2  is covering the low band, minimizing interference between the antennas and the impact of data connector  80  on low band communications. Antenna  40 - 1  and positive antenna feed terminal  52 - 1  may still cover other frequency bands while antenna  40 - 2  covers the low band (e.g., switch  114  may still couple positive antenna feed terminal  52 - 1  to point  94  at frequencies greater than the low band while also forming a short circuit impedance from point  94  to ground structures  78  at frequencies in the low band). 
     Conversely, when antenna  40 - 1  is actively covering the low band (e.g., while switch  114  is open or otherwise coupling positive antenna feed terminal  52 - 1  to point  96  via conductive trace  84 - 1 ), switchable component  118  and/or switchable component  138  of antenna  40 - 2  may form short circuit impedances between segment  70  and ground structures  78  at frequencies in the low band, as shown by arrows  142 . This may effectively kill any low band resonance of antenna  40 - 2  while antenna  40 - 1  is covering the low band, minimizing interference between the antennas and the impact of data connector  80  on low band communications. Control circuitry  38  ( FIG.  1   ) may provide control signals that control the state of the switchable components and switches of  FIG.  6   . In this way, antennas  40 - 1  and  40 - 2  may both cover the cellular low band with satisfactory antenna efficiency (e.g., efficiency bandwidth) while also covering higher frequencies, despite the relatively small volume of antenna  40 - 1  relative to antenna  40 - 2  and despite the presence of a relatively large data connector  80 . This may, for example, increase the amount of low band diversity achievable with device  10  (e.g., allowing antenna  40 - 1  to cover the low band when a user&#39;s hand or other object is blocking antenna  40 - 2  and allowing antenna  40 - 2  to cover the low band when a user&#39;s hand or other object is blocking antenna  40 - 1 ). However, since only one of antennas  40 - 1  and  40 - 2  are able to cover the low band at a given time, antennas  40 - 1  and  40 - 2  of  FIG.  6    may be incapable of concurrently covering the low band for MIMO operations, thereby limiting data throughput. 
     To allow antennas  40 - 1  and  40 - 2  to concurrently cover the low band (e.g., for performing low band MIMO), peripheral conductive housing structures  12 W may be provided with an additional dielectric gap.  FIG.  7    is a top interior view showing how an additional dielectric gap may be formed in peripheral conductive housing structures  12 W to allow antennas  40 - 1  and  40 - 2  to concurrently cover the low band. 
     As shown in  FIG.  7   , peripheral conductive housing structures may include an additional dielectric gap such as gap  18 - 4 . Gaps  18 - 3  and  18 - 4  may be located at opposing sides of ground extension  74  (e.g., the data connector). When arranged in this way, gap  18 - 3  may separate segment  68  from an additional segment  144  of peripheral conductive housing structures  12 W. Gap  18 - 4  may separate segment  70  from segment  144 . Adding gap  18 - 4  may increase the amount of symmetry between antennas  40 - 1  and  40 - 2  about longitudinal axis  76 . For example, segment  70  may be approximately the same length as segment  68 . Gaps  18 - 1  and  18 - 2  may be disposed in peripheral conductive housing structures  12 W at a location higher along the Y-axis than in the arrangement of  FIG.  6    if desired, thereby allowing segments  68  and  70  to recover some of the length lost to segment  144  by the introduction of gap  18 - 4  (e.g., for covering the low band in a fundamental mode). 
       FIG.  8    is a diagram showing how antennas  40 - 1  and  40 - 2  may be concurrently operated in the low band when peripheral conductive housing structures  12 W include gap  18 - 4  and segment  144 . As shown in  FIG.  8   , data connector  80  may protrude through an opening in segment  144 . Data connector  80  may be grounded and may thus form part of ground structures  78 . Data connector  80  may also be electrically coupled to segment  114  at one or more locations  154  (e.g., using solder, welds, conductive screws, conductive clips, conductive adhesive, etc.). This may also configure segment  144  to form part of the antenna ground. Grounding data connector  80  and segment  144  in this way, and further separating segment  68  from segment  70  by gap  18 - 4  and segment  144 , may help to isolate antenna  40 - 1  and antenna  40 - 2  from each other and from data connector  80 , particularly when covering frequencies in the low band. 
     The components and operation of antennas  40 - 1 ,  40 - 2 ,  40 - 3 , and  40 - 4  in the example of  FIG.  8    is the same as in the arrangement of  FIG.  6   , except antennas  40 - 1  and  40 - 2  may concurrently cover the low band with satisfactory antenna efficiency (e.g., for performing low band MIMO operations) in the example of  FIG.  8   . Switchable component  98  may perform low band tuning for antenna  40 - 1  (e.g., while conveying antenna current between points  132  and  98  as shown by arrow  160 ). Switchable component  138  may perform low band tuning for antenna  40 - 2  (e.g., while conveying antenna current between points  136  and  130  as shown by arrow  162 ). While conductive trace  84 - 2  may be longer than conductive trace  84 - 1  in the arrangement of  FIG.  6   , conductive trace  84 - 2  may be the same length as conductive trace  84 - 1  in the arrangement of  FIG.  8   . Segments  68  and  70  may be the same length in the arrangement of  FIG.  8   , and gaps  18 - 1  and  18 - 2  may be moved further upwards on device  10  to increase the antenna efficiency in the low band for both antennas  40 - 1  and  40 - 2 . 
     The examples of  FIGS.  6  and  8    are merely illustrative. Conductive traces  84 - 1  and  84 - 2  need not be straight/rectangular traces and may, if desired, have other shapes (e.g., conductive trace  84 - 1  and/or conductive trace  84 - 2  may follow a meandering path and may have any desired number of straight and/or curved sides). If desired, conductive trace  84 - 1  may extend rightwards past dielectric gap  18 - 3  of  FIGS.  6  and  8   , such that conductive trace  84 - 1  at least partially overlaps segment  70  of peripheral conductive housing structures  12 W. 
     In the example of  FIG.  6    in which only one of antenna  40 - 1  or antenna  40 - 2  covers the low band at any given time, antenna  40 - 2  may be configured to boost the wireless performance of antenna  40 - 1  in the low band via near-field electromagnetic coupling. For example, a near-field electromagnetic coupling between segments  68  and  70  across dielectric gap  18 - 3  may cause some of segment  70  to form part of the radiating element arm of antenna  40 - 1  (e.g., an extension of the arm formed by segment  68 ) at frequencies in the low band. The tuning of antenna  40 - 2  may be adjusted when antenna  40 - 1  is radiating in the low band to help accommodate this near-field electromagnetic coupling, thereby helping to boost the antenna efficiency of antenna  40 - 1  in the cellular low band. If desired, segment  68  and/or segment  70  may include conductive knuckle structures at dielectric gap  18 - 3  that help to establish this near-field electromagnetic coupling in the low band. 
       FIG.  9    is a plot showing how antenna  40 - 2  of  FIG.  6    may help to boost the low band performance of antenna  40 - 1  in the low band. Curve  156  plots the antenna efficiency of antenna  40 - 1  in the cellular low band when antenna  40 - 2  is tuned (e.g., using switchable component  118 ) to optimize the performance of antenna  40 - 2  in the midband. Antenna  40 - 2  may have an additional tuning state (e.g., as established by one or more tunable components of antenna  40 - 2  such as switchable component  118 ) that maximizes low band near-field coupling between segments  68  and  70  to allow segment  70  of antenna  40 - 2  to contribute to the low band performance of antenna  40 - 1 . Curve  158  plots the antenna efficiency of antenna  40 - 1  in the low band when antenna  40 - 2  is tuned (e.g., using switchable component  118 ) to boost the low band performance of antenna  40 - 1  via near-field coupling across dielectric gap  18 - 3 . As shown by curves  156  and  158 , adjusting the tuning of antenna  40 - 2  in this way (e.g., by adjusting the state of switchable component  118 ) may serve to increase the antenna efficiency of antenna  40 - 1  across the cellular low band (e.g., by 2 dB or more). Conversely, the tuning of antenna  40 - 1  (e.g., switchable component  116 ) may be adjusted to optimize the low band performance of antenna  40 - 2  via near-field coupling across dielectric gap  18 - 3 . The example of  FIG.  9    is merely illustrative and, in practice, curves  156  and  158  may have other shapes. 
     Device  10  may gather and/or use personally identifiable information. It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users. 
     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: 20220314
Publication Date: 20240213
Grant Date: 20240213
Priority Date: 20220314
Inventors: VAZQUEZ, ENRIQUE AYALA
HAN, XU
HU, HONGFEI
CHEN, MING
ZHONG, JINGNI
IRCI, Erdinc
YARGA, SALIH
SALEHI, MOHSEN
DI NALLO, CARLO
TSAI, MING-JU
PASCOLINI, MATTIA
Assignee: APPLE INC
CPC Classifications: [{"code": "H01Q21/28", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/241", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/38", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/243", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q21/28", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q9/42", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q5/328", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q13/10", "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": "[]"}]
Family ID: 87931211