PATENT DOCUMENT

Publication Number: US-11152708-B2
Application Number: US-201916357289-A
Country: US
Kind Code: B2

Title: Electronic device handle antennas

Abstract:
An electronic device such as a desktop computer may have a housing. The housing may include a conductive inner frame, conductive handles coupled to the inner frame, and a conductive outer sleeve over the inner frame. The handles may protrude through openings in the outer sleeve. Conductive plates may be aligned with the openings and attached to the inner frame. The handles may pass through holes in the conductive plates. Slot antennas may be formed in the conductive plates. The slot antennas may each include a high band slot that indirectly feeds a pair of low band slots. The conductive plates and the inner frame may define cavities for the antennas. Multi-band slot antennas may be formed within the handles themselves. The handles may include solid metal with a channel or may include hollow metal structures to accommodate transmission lines for the antennas.

Claims:
What is claimed is: 
     
       1. An electronic device, comprising:
 a conductive plate having an opening; 
 an electronic device handle extending through the opening in the conductive plate; and 
 an antenna having first and second slot elements in the conductive plate and an antenna feed coupled to the conductive plate across the first slot element, wherein the first slot element is formed in a central portion of the conductive plate, and a lip portion of the conductive plate that extends around a periphery of the central portion defines an edge of the second slot element. 
 
     
     
       2. The electronic device defined in  claim 1 , wherein the second slot element is configured to radiate in a first frequency band, the first slot element is configured to radiate in a second frequency band that is higher than the first frequency band, and the first slot element is configured to indirectly feed the second slot element. 
     
     
       3. The electronic device defined in  claim 1 , wherein the central portion is in a first plane and the lip portion is in a second plane. 
     
     
       4. The electronic device defined in  claim 3 , further comprising:
 a conductive inner frame, wherein the conductive plate is mounted to the conductive inner frame; and 
 a conductive outer sleeve having an additional opening, wherein the conductive outer sleeve is mounted over the conductive inner frame, the central portion of the conductive plate lies within the additional opening, the electronic device handle is coupled to the conductive inner frame, and the electronic device handle protrudes through the additional opening. 
 
     
     
       5. The electronic device defined in  claim 4 , further comprising:
 a dielectric gasket interposed between the central portion of the conductive plate and the conductive outer sleeve, wherein the second slot element is configured to convey radio-frequency signals in a first frequency band through the dielectric gasket and the first slot element is configured to convey radio-frequency signals in a second frequency band. 
 
     
     
       6. The electronic device defined in  claim 5 , wherein the first frequency band comprises a 2.4 GHz wireless local area network frequency band and the second frequency band comprises a 5 GHz wireless local area network frequency band. 
     
     
       7. The electronic device defined in  claim 4 , further comprising an air vent in the conductive outer sleeve. 
     
     
       8. The electronic device defined in  claim 1 , further comprising:
 a tuning element coupled to the conductive plate across the second slot element. 
 
     
     
       9. The electronic device defined in  claim 1 , further comprising:
 a printed circuit board having opposing first and second surfaces; 
 first ground traces on the first surface; 
 a contact pad on the first surface; 
 a coaxial cable having a ground conductor coupled to the first ground traces and having a signal conductor coupled to the contact pad; 
 second ground traces on the second surface and coupled to the first ground traces by a conductive via extending through the printed circuit board; and 
 a conductive gasket coupled to the second ground traces and pressed against the conductive plate. 
 
     
     
       10. The electronic device defined in  claim 9 , further comprising:
 a conductive screw that extends through the printed circuit board and that couples the contact pad to the conductive plate. 
 
     
     
       11. The electronic device defined in  claim 10 , further comprising:
 a capacitor on the printed circuit board; 
 an additional conductive screw that extends through the printed circuit board and that couples a first terminal of the capacitor to the conductive plate; and 
 a conductive spring that couples a second terminal of the capacitor to the conductive plate. 
 
     
     
       12. The electronic device defined in  claim 1 , further comprising:
 an additional antenna having a third slot element in the conductive plate and an additional antenna feed coupled to the conductive plate across the third slot element. 
 
     
     
       13. The electronic device defined in  claim 1 , further comprising:
 a conductive inner frame; 
 control circuitry within the conductive inner frame; 
 a conductive outer sleeve that covers the conductive inner frame; and 
 a first opening in the conductive outer sleeve, wherein the conductive plate is mounted to the conductive inner frame and aligned with the first opening, the electronic device handle is coupled to the conductive inner frame, and the electronic device handle protrudes through the first opening in the conductive outer sleeve and through the opening in the conductive plate. 
 
     
     
       14. The electronic device defined in  claim 13 , further comprising:
 a second opening in the conductive outer sleeve; 
 an additional conductive plate, wherein the additional conductive plate is mounted to the conductive inner frame and aligned with the second opening; 
 an additional electronic device handle extending through an additional opening in the additional conductive plate; and 
 an additional antenna having an additional slot element in the additional conductive plate and an additional antenna feed coupled to the additional conductive plate across the additional slot element. 
 
     
     
       15. The electronic device defined in  claim 13 , wherein the conductive outer sleeve has a first wall that includes the first opening and a second wall extending perpendicular to the first wall, the electronic device further comprising an air vent selected from the group consisting of: a first air vent in the first wall and a second air vent in the second wall. 
     
     
       16. The electronic device defined in  claim 13 , wherein the conductive inner frame and the conductive plate define edges of a dielectric-filled cavity that backs the first slot element. 
     
     
       17. An electronic device, comprising:
 a conductive plate having an opening; 
 an electronic device handle extending through the opening in the conductive plate; 
 an antenna having a slot element in the conductive plate and an antenna feed coupled to the conductive plate across the slot element; 
 a printed circuit substrate having opposing first and second surfaces; 
 a transmission line having a ground conductor coupled to a first ground trace at the first surface and having a signal conductor coupled to the printed circuit substrate; and 
 a conductive structure that couples a second ground trace at the second surface to the conductive plate, wherein a conductive via in the printed circuit substrate connects the first ground trace to the second ground trace. 
 
     
     
       18. An electronic device, comprising:
 a conductive plate having an opening; 
 an electronic device handle extending through the opening in the conductive plate; 
 an antenna having a slot element in the conductive plate and an antenna feed coupled to the conductive plate across the slot element; 
 a conductive inner frame; 
 control circuitry within the conductive inner frame; and 
 a conductive outer sleeve that covers the conductive inner frame and that has an additional opening, wherein the conductive plate is mounted to the conductive inner frame and aligned with the additional opening, and the electronic device handle protrudes through the additional opening in the conductive outer sleeve.

Description:
BACKGROUND 
     This relates to electronic devices, and more particularly, to electronic devices with wireless communications circuitry. 
     Electronic devices are often provided with wireless communications capabilities. An electronic device with wireless communications capabilities has wireless communications circuitry with one or more antennas. Wireless transceiver circuitry in the wireless communications circuitry uses the antennas to transmit and receive radio-frequency signals. 
     It can be challenging to form a satisfactory antenna for an electronic device. If care is not taken, the antenna may not perform satisfactorily, may be overly complex to manufacture, or may be difficult to integrate into a device. 
     SUMMARY 
     An electronic device such as a desktop computer may have a housing. The housing may have a conductive inner frame and a conductive outer sleeve mounted over the conductive inner frame. The conductive outer sleeve may have first and second openings. The electronic device may have first and second electronic device handles. The first handle may be coupled to the conductive inner frame through the first opening and the second handle may be coupled to the conductive inner frame through the second opening. Conductive plates may be mounted within the conductive outer sleeve in alignment with the first and second openings. Each conductive plate may include a pair of holes that pass a respective one of the handles. 
     The conductive plate may include a central portion that lies flush with an exterior surface of the conductive outer sleeve and a lip that extends around a periphery of the central portion. The central portion and the lip may lie within separate parallel planes. The central portion may be separated from the conductive outer sleeve by a ring-shaped gap that is filled with a dielectric gasket. Each conductive plate may be used to form at least two antennas. Each antenna may include a high band slot element in the central portion and a pair of low band slot elements in the lip. An antenna feed may be coupled to the central portion across the high band slot element. The high band slot element may indirectly feed the low band slot elements. The low band slot elements may radiate in a first frequency band (e.g., a 2.4 GHz wireless local area network band) through the dielectric gasket. The high band slot element may radiate in a second frequency band (e.g., a 5 GHz wireless local area network band). An interposer printed circuit board may be used to facilitate coupling between a radio-frequency transmission line and the antenna feed. The conductive plate and the conductive inner frame may define the edges of a dielectric-filled cavity that optimizes the efficiency of the antenna. 
     If desired, the handle may be formed from solid conductive material. A slot element for an antenna may be formed within the solid conductive material. An antenna feed may be coupled to the handle across the slot element. A channel may be formed in the solid conductive material. A radio-frequency transmission line may lie within the channel and may be coupled to the antenna feed. In another suitable arrangement, the handle may include first and second conductive structures that define an interior cavity of the handle. The first and second conductive structures may be separated by a slot element for an antenna. An antenna feed may be coupled across the slot element. A printed circuit board may be mounted to the first and second conductive structures within the interior cavity using conductive screws. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of an illustrative electronic device in accordance with some embodiments. 
         FIG. 2  is a perspective view of an illustrative electronic device in accordance with some embodiments. 
         FIG. 3  is an exploded perspective view of an illustrative electronic device in accordance with some embodiments. 
         FIG. 4  is a cross-sectional side view of an illustrative electronic device in a rack-based configuration in accordance with some embodiments. 
         FIGS. 5 and 6  are diagrams of illustrative slot antennas in accordance with some embodiments. 
         FIG. 7  is a top-down view of an illustrative conductive support plate for an electronic device handle having slot antennas in accordance with some embodiments. 
         FIG. 8  is a cross-sectional side view of an illustrative slot antenna formed in a conductive support plate for an electronic device handle in accordance with some embodiments. 
         FIG. 9  is a bottom-up view of an illustrative printed circuit board that that may be used to feed a slot antenna of the type shown in  FIG. 8  in accordance with some embodiments. 
         FIG. 10  is a top-down view of an illustrative printed circuit board that may be used to feed a slot antenna of the type shown in  FIG. 8  in accordance with some embodiments. 
         FIG. 11  is a cross-sectional side view of an illustrative conductive support plate having multiple slot antennas for covering different frequencies in accordance with some embodiments. 
         FIG. 12  is a side view of an illustrative slot antenna formed in a solid electronic device handle in accordance with some embodiments. 
         FIG. 13  is an exploded side view of an illustrative solid electronic device handle having a slot antenna in accordance with some embodiments. 
         FIG. 14  is a perspective view of an illustrative slot antenna formed in a hollow electronic device handle in accordance with some embodiments. 
         FIG. 15  is a cross-sectional side view of an illustrative hollow electronic device handle having a slot antenna in accordance with some embodiments. 
         FIG. 16  is a schematic diagram that illustrates how an illustrative slot antenna of the type shown in  FIGS. 14 and 15  may support multiple resonant modes in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     An electronic device such as electronic device  10  of  FIG. 1  may be provided with wireless circuitry. The wireless circuitry may include antennas such as wireless local area network antennas or other antennas. Electronic device  10  may be a computing device such as a laptop computer, a desktop computer, a computer monitor containing an embedded computer, a tablet computer, a cellular telephone, a media player, or other handheld or portable electronic device, a smaller device such as a wristwatch device, a pendant device, a headphone or earpiece device, a device embedded in eyeglasses or other equipment worn on a user&#39;s head, or other wearable or miniature device, a television, a computer display that does not contain an embedded computer, a gaming device, a navigation device, an embedded system such as a system in which electronic equipment with a display is mounted in a kiosk or automobile, a wireless internet-connected voice-controlled speaker, a wireless base station or access point, equipment that implements the functionality of two or more of these devices, or other electronic equipment. 
     As shown in  FIG. 1 , device  10  may include control circuitry  12 . Control circuitry  12  may include storage such as storage circuitry  16 . Storage circuitry  16  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  12  may include processing circuitry such as processing circuitry  14 . Processing circuitry  14  may be used to control the operation of device  10 . Processing circuitry  14  may include on one or more microprocessors, microcontrollers, digital signal processors, host processors, baseband processor integrated circuits, application specific integrated circuits, central processing units (CPUs), etc. Control circuitry  12  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  16  (e.g., storage circuitry  16  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  16  may be executed by processing circuitry  14 . 
     Control circuitry  12  may be used to run software on device  10  such as satellite navigation applications, internet browsing applications, voice-over-internet-protocol (VOIP) telephone call applications, email applications, media playback applications, operating system functions, etc. To support interactions with external equipment, control circuitry  12  may be used in implementing communications protocols. Communications protocols that may be implemented using control circuitry  12  include internet protocols, wireless local area network (WLAN) protocols (e.g., IEEE 802.11 protocols—sometimes referred to as Wi-Fi®), protocols for other short-range wireless communications links such as the Bluetooth® protocol or other wireless personal area network (WPAN) protocols, IEEE 802.11ad protocols, cellular telephone protocols, MIMO protocols, antenna diversity protocols, satellite navigation system protocols (e.g., global positioning system (GPS) protocols, global navigation satellite system (GLONASS) protocols, etc.), or any other desired communications protocols. Each communications protocol may be associated with a corresponding radio access technology (RAT) that specifies the physical connection methodology used in implementing the protocol. 
     Device  10  may include input-output circuitry  18 . Input-output circuitry  18  may include input-output devices  20 . Input-output devices  20  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  20  may include user interface devices, data port devices, and other input-output components. For example, input-output devices  20  may include touch sensors, displays, light-emitting components such as displays without touch sensor capabilities, buttons (mechanical, capacitive, optical, etc.), scrolling wheels, touch pads, key pads, keyboards, microphones, cameras, buttons, speakers, status indicators, audio jacks and other audio port components, digital data port devices, motion sensors (accelerometers, gyroscopes, and/or compasses that detect motion), capacitance sensors, proximity sensors, magnetic sensors, force sensors (e.g., force sensors coupled to a display to detect pressure applied to the display), etc. In some configurations, keyboards, headphones, displays, pointing devices such as trackpads, mice, and joysticks, and other input-output devices may be coupled to device  10  using wired or wireless connections (e.g., some of input-output devices  20  may be peripherals that are coupled to a main processing unit or other portion of device  10  via a wired or wireless link). 
     Input-output circuitry  18  may include wireless circuitry  22  to support wireless communications. Wireless circuitry  22  may include radio-frequency (RF) transceiver circuitry  24  formed from one or more integrated circuits, power amplifier circuitry, low-noise input amplifiers, passive RF components, one or more antennas such as antenna  40 , transmission lines such as transmission line  26 , and other circuitry for handling RF wireless signals. Wireless signals can also be sent using light (e.g., using infrared communications). While control circuitry  12  is shown separately from wireless circuitry  22  in the example of  FIG. 1  for the sake of clarity, wireless circuitry  22  may include processing circuitry that forms a part of processing circuitry  14  and/or storage circuitry that forms a part of storage circuitry  16  of control circuitry  12  (e.g., portions of control circuitry  12  may be implemented on wireless circuitry  22 ). As an example, control circuitry  12  (e.g., processing circuitry  14 ) may include baseband processor circuitry or other control components that form a part of wireless circuitry  22 . 
     Radio-frequency transceiver circuitry  24  may include wireless local area network transceiver circuitry that handles 2.4 GHz and 5 GHz bands for Wi-Fi® (IEEE 802.11) or other WLAN communications bands and may include wireless personal area network transceiver circuitry that handles the 2.4 GHz Bluetooth® communications band or other WPAN communications bands. If desired, radio-frequency transceiver circuitry  24  may handle other bands such as cellular telephone bands, near-field communications bands (e.g., at 13.56 MHz), millimeter or centimeter wave bands (e.g., communications at 10-300 GHz), and/or other communications bands. Configurations in which radio-frequency transceiver circuitry  24  handles wireless local area network bands (e.g., at 2.4 GHz and 5 GHz) may sometimes be described herein as an example. In general, however, radio-frequency transceiver circuitry  24  may be configured to cover any suitable communications bands of interest. 
     Wireless circuitry  22  may include one or more antennas such as antenna  40 . Antennas such as antenna  40  may be formed using any suitable antenna types. For example, antennas in device  10  may include antennas with resonating elements that are formed from loop antenna structures, patch antenna structures, inverted-F antenna structures, slot antenna structures, planar inverted-F antenna structures, helical antenna structures, monopole antennas, dipoles, hybrids of these designs, etc. Parasitic elements may be included in antennas  40  to adjust antenna performance. Antenna  40  may be provided with a conductive cavity that backs the antenna resonating element of antenna  40  (e.g., antenna  40  may be a cavity-backed antenna such as a cavity-backed slot antenna). In some configurations, device  10  may have isolation elements between respective antennas  40  to help avoid antenna-to-antenna cross-talk. Different types of antennas may be used for different bands and combinations of bands. For example, one type of antenna may be used in forming a local wireless link antenna and another type of antenna may be used in forming a remote wireless link antenna. In some configurations, different antennas may be used in handling different bands for radio-frequency transceiver circuitry  24 . Each antenna  40  may cover one or more bands. For example, antennas  40  may be single band wireless local area network antennas or dual band wireless local area network antennas. 
     As shown in  FIG. 1 , radio-frequency transceiver circuitry  24  may be coupled to antenna feed  32  of antenna  40  using transmission line  26 . Antenna feed  32  may include a positive antenna feed terminal such as positive antenna feed terminal  34  and may include a ground antenna feed terminal such as ground antenna feed terminal  36 . Transmission line  26  may be formed from metal traces on a printed circuit, cables, or other conductive structures. Transmission line  26  may have a positive transmission line signal path such as path  28  that is coupled to positive antenna feed terminal  34 . Transmission line  26  may have a ground transmission line signal path such as path  30  that is coupled to ground antenna feed terminal  36 . Path  28  may sometimes be referred to herein as signal conductor  28  and path  30  may sometimes be referred to herein as ground conductor  30 . 
     Transmission line paths such as transmission line  26  may be used to route antenna signals within device  10 . Transmission lines in device  10  may include coaxial cables, microstrip transmission lines, stripline transmission lines, edge-coupled microstrip transmission lines, edge-coupled stripline transmission lines, transmission lines formed from combinations of transmission lines of these types, etc. Transmission lines in device  10  such as transmission line  26  may be integrated into rigid and/or flexible printed circuit boards. In one suitable arrangement, transmission lines such as transmission line  26  may also include transmission line conductors (e.g., signal conductors  28  and ground conductors  30 ) integrated within multilayer laminated structures (e.g., layers of a conductive material such as copper and a dielectric material such as a resin that are laminated together without intervening adhesive). The multilayer laminated structures may, if desired, be folded or bent in multiple dimensions (e.g., two or three dimensions) and may maintain a bent or folded shape after bending (e.g., the multilayer laminated structures may be folded into a particular three-dimensional shape to route around other device components and may be rigid enough to hold its shape after folding without being held in place by stiffeners or other structures). All of the multiple layers of the laminated structures may be batch laminated together (e.g., in a single pressing process) without adhesive (e.g., as opposed to performing multiple pressing processes to laminate multiple layers together with adhesive). 
     Filter circuitry, switching circuitry, impedance matching circuitry, and other circuitry may be interposed within the paths formed using transmission lines such as transmission line  26  and/or circuits such as these may be incorporated into antenna  40  (e.g., to support antenna tuning, to support operation in desired frequency bands, etc.). During operation, control circuitry  12  may use radio-frequency transceiver circuitry  24  and antenna(s)  40  to transmit and receive data wirelessly. Control circuitry  12  may, for example, receive wireless local area network communications wirelessly using radio-frequency transceiver circuitry  24  and antenna(s)  40  and may transmit wireless local area network communications wirelessly using radio-frequency transceiver circuitry  24  and antenna(s)  40 . 
     Electronic device  10  may be provided with electronic device housing  38 . Housing  38 , 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. Housing  38  may be formed using a unibody configuration in which some or all of housing  38  is machined or molded as a single structure or may be formed using multiple structures (e.g., an internal frame structure covered with one or more outer housing layers). Configurations for housing  38  in which housing  38  includes support structures (a stand, leg(s), handles, etc.) may also be used. In one suitable arrangement that is described herein as an example, housing  38  includes a conductive inner frame, a conductive outer housing, and conductive support structures such as one or more conductive handles. The conductive handles (sometimes referred to herein as electronic device handles) may be used to help pick up, carry, move, or position device  10  (e.g., on a desktop, table top, network rack, or other surface). The electronic device handles may be secured (affixed) to the conductive inner frame. The conductive outer housing (sometimes referred to herein as a conductive outer sleeve) may be placed over the conductive inner frame. The electronic device handles may protrude through openings in the conductive outer sleeve. 
     A perspective view of an illustrative electronic device such as device  10  of  FIG. 1  is shown in  FIG. 2 . In the example of  FIG. 2 , housing  38  is provided with a rectangular box shape. In general, device  10  may have a housing with any suitable shape (e.g., a box shape with a different number of sides, pyramidal, cylindrical, conical, spherical, a shape with a combination of curved sides and planar sides, etc.). The box-shaped housing of  FIG. 2  is illustrative. 
     As shown in  FIG. 2 , housing  38  may be characterized by a width W, a height H, and a length L. The values of W, H, and L may be at least 1 mm, at least 10 mm, at least 100 mm, at least 300 mm, may be less than 1000 mm, less than 750 mm, may be less than 500 mm, may be less than 250 mm, or may be any other suitable value. In some configurations, housing  38  is low and wide (e.g., H may be less than W and less than L). In other configurations, housing  38  may be thinner and taller. For example, H may be at least two times W, at least 3 times W, or other suitably large value. If desired, L may be larger than W (e.g., L may be at least 1.5 times W, 2 times W, at least three times W, etc.). Other shapes and sizes may be used for housing  38  if desired. The example of  FIG. 2  is illustrative. 
     Housing  38  may have edges such as edges that extend along the four corners  44  of housing  38  of  FIG. 2  (e.g., the four corners of housing  38  when an outline of housing  38  is viewed from above). Each corner  44  may, for example, have an edge that extends vertically along vertical the Z-axis. Housing walls may be formed on the top and bottom of housing  38  (e.g., walls that lie parallel to the X-Y plane), the left and right sides of housing  38  (walls that lie parallel to the Y-Z plane), and/or on the front and rear sides of housing  38  (walls that lie parallel to the X-Z plane). In the example of  FIG. 2 , housing  38  has a bottom wall  42 B, a top wall  42 T, and four side walls  42 S extending from bottom wall  42 B to top wall  42 T. In this type of arrangement, walls  42 S,  42 T, and  42 B form an enclosure for device  10  that is a six-sided box. 
     Walls  42 T,  42 B, and/or  42 S may be formed from conductive material such as metal (e.g., aluminum, steel, etc.), other conductive materials, and/or insulating material (e.g., polymer, etc.). In some configurations, walls  42 T,  42 B, and/or  42 S, or portions of walls  42 T,  42 B, and/or  42 S may have areas such as areas  51  to accommodate buttons and other input-output devices  20  ( FIG. 1 ), ports for coupling to removable storage media, ports that facilitate coupling to peripherals (e.g., data ports), audio ports, air vents for drawing air into the interior of housing  38 , air vents for expelling air out of the interior of housing  38 , etc. Areas  51  may be located on one or more of walls  42 T,  42 B, and  42 S (as an example). For example, an area  51  that contains a power port and data and display ports and may be located on the rear wall of housing  38 . 
     Housing  38  may include openings  46 . Openings  46  may be formed in one of the walls of housing  38  such as top wall  42 T. Electronic device handles such as electronic device handles  50  may protrude through openings  46 . Device  10  may have one, two, or more than two electronic device handles  50 . In one suitable arrangement that is sometimes described herein as an example, device  10  includes two electronic device handles  50  protruding through two respective openings  46 . 
     Support structures for electronic device handles  50  such as conductive support plates  48  may be aligned with (e.g., formed within) openings  46 . In one suitable arrangement that is described herein as an example, housing  38  (e.g., top wall  42 T, side walls  42 S, and bottom wall  42 B), electronic device handles  50 , and conductive support plates  48  are each formed using conductive material such as metal (e.g., aluminum, steel, iron, silver, gold, copper, metal alloys, etc.). This is merely illustrative and, if desired, some or all of housing  38 , conductive support plates  48 , and/or electronic device handles  50  may be formed from dielectric materials. 
     Conductive support plates  48  may help to hold electronic device handles  50  in place and may help to protect the interior of housing  38  from contamination and damage. Electronic device handles  50  may be secured to conductive support plates  48  using adhesive, solder, welds, screws, or other fastening structures. In another suitable arrangement, electronic device handles  50  may extend through openings in conductive support plates  48  (e.g., without being adhered or affixed to conductive support plates  48 ). This may allow electronic device handles  50  to be secured to an internal frame of housing  38  through conductive support plates  48 . Conductive support plates  48  may sometimes be referred to herein as conductive plates  48 , conductive islands  48  (e.g., because conductive support plates  48  may be aligned with openings  46  without contacting the conductive outer sleeve for housing  38 ), or conductive members  48 . 
     One or more antennas such as antenna  40  of  FIG. 1  may be formed in device  10  to handle wireless communications. In some configurations, antennas or parts of antenna may be formed from internal device components (e.g., antenna traces on printed circuit boards mounted within the interior of housing  38 ). However, in scenarios where housing  38  is formed from metal, the metal in housing  38  can undesirably block antennas formed from internal device components from conveying radio-frequency signals with external wireless communications equipment. In other configurations, antennas or parts of antennas may be formed from conductive housing structures in housing  38 . For example, conductive support plates  48 , top wall  42 T, and/or electronic device handles  50  may be used to form antennas or parts of antennas for device  10 . These conductive structures may be provided with one or more openings to form slot antennas, inverted-F antennas, other antennas (e.g., the antenna resonating element and/or antenna ground for other antennas), hybrid antennas that include resonating elements of more than one type, etc. In one suitable arrangement that is sometimes described herein as an example, conductive support plates  48 , top wall  42 T, and/or electronic device handles  50  may be used to form slot antennas for device  10 . Forming antennas using conductive support plates  48 , electronic device handles  50 , and top wall  42 T may allow the antennas to be placed at a location as far from the interior of device  10  as possible, thereby optimizing antenna gain and efficiency (e.g., without conductive portions of housing  38  blocking the radio-frequency signals conveyed by the antennas). 
       FIG. 3  is an exploded perspective view of device  10  showing how housing  38  may be formed from both an internal housing structure such as a conductive inner frame and an external housing structure such as a conductive outer sleeve. As shown in  FIG. 3 , housing  38  of device  10  may include conductive outer sleeve  52  and conductive inner frame  54 . Portions of conductive inner frame  54  and/or portions of conductive outer sleeve  52  may be used to form part of the antenna ground for one or more antennas in device  10  if desired. 
     Conductive inner frame  54  may house control circuitry  12 , radio-frequency transceiver circuitry  24 , and some or all of control circuitry  12  of  FIG. 1 , for example. Conductive inner frame  54  may be formed from conductive material such as metal. If desired, portions of conductive inner frame  54  may be formed from plastic or other dielectric materials. Conductive inner frame  54  may have openings or ports to accommodate components within areas  51  of  FIG. 2  if desired. 
     As shown in  FIG. 3 , electronic device handles  50  may be mounted and secured (affixed) to conductive inner frame  54 . Electronic device handles  50  may have threaded ends that are screwed into threaded holes in conductive inner frame  54  or may be secured to conductive inner frame  54  using conductive adhesive, screws, welds, and/or any other desired fastening structures. In another suitable arrangement, electronic device handles  50  and conductive inner frame  54  may be formed from a single integral piece of metal. Each electronic device handle  50  may be secured to a respective conductive support plate  48  or may pass through openings in conductive support plate  48 . Conductive support plates  48  may be secured to conductive inner frame  54  using adhesive, solder, welds, springs, pins, screws, and/or any other desired fastening structures (e.g., conductive support plates  48  may be electrically coupled to conductive inner frame  54  using the fastening structures). In another suitable arrangement, conductive support plates  48  may be placed over conductive inner frame  54  without being affixed or coupled to conductive inner frame  54 . In yet another suitable arrangement, conductive support plates  48  and conductive inner frame  54  may be formed from a single integral piece of metal. 
     Conductive outer sleeve  52  may include an open end  58  that is placed over conductive inner frame  54 , as shown by arrow  56 . Conductive outer sleeve  52  may be slid into place over conductive inner frame  54 . When secured in place, electronic device handles  50  on conductive inner frame  54  may extend (protrude) through respective openings  46  in conductive outer sleeve  52 . Conductive support plates  48  may fill the lateral portions of conductive openings  46  that are not occupied by electronic device handles  50  (e.g., to protect conductive inner frame  54  from contaminants and damage). When conductive outer sleeve  52  is in place over conductive inner frame  54 , conductive outer sleeve  52  may, if desired, be secured to conductive inner frame  54  using clips, screws, springs, pins, latches, magnets, and/or any other desired fastening structures. If desired, conductive outer sleeve  52  may be removable from conductive inner frame  54  to allow the components of conductive inner frame  54  to be removed, replaced, repaired, cleaned, or upgraded over time. 
     If desired, one or more side walls  42 S may be provided with openings to allow air to pass into and out of conductive outer sleeve  52 . For example, a first air vent (port)  60  may be formed from openings in a first side wall  42 S of conductive outer sleeve  52  and a second air vent (port)  62  may be formed from openings in a second side wall  42 S opposite to the first side wall  42 S. Air vent  60  may serve as an air intake vent that draws in air  66  to help cool components within conductive inner frame  54 . Air vent  62  may serve as an air exhaust that expels (heated) exhaust air  64  out of housing  38 . Conductive inner frame  54  may include air vents (not shown in  FIG. 3  for the sake of clarity) that overlap with the air vents in conductive outer sleeve  52 . In this way, the components within device  10  may operate at a sufficiently low operating temperature despite the presence of conductive outer sleeve  52 . This example is merely illustrative and, if desired, additional air vents may be formed on additional walls of housing  38 . 
     In the example of  FIG. 3 , housing  38  is provided with an upright configuration in which bottom wall  42 B rests an underlying surface such as the ground or a tabletop. In another suitable arrangement, housing  38  may be provided with a rack-based configuration.  FIG. 4  is a cross-sectional side view of device  10  in an example where housing  38  is provided with a rack-based configuration. In the rack-based configuration of  FIG. 4 , a given side wall  42 S of conductive outer sleeve  52  faces downward and is placed onto a surface such as a surface of a network rack (e.g., a network rack in a data center, server farm, or elsewhere). Multiple devices  10  may be stacked in the network rack. 
     Conductive outer sleeve  52  may be slid over conductive inner frame  54  from right to left. Electronic device handles  50  may protrude through openings  46 . In the rack-based configuration of  FIG. 4 , conductive outer sleeve  52  may be provided with an air vent such as air vent  68  in top wall  42 T at the right of housing  38 . Conductive inner frame  54  may be provided with air vents  74  and  75  that are aligned with air vent  68 . Air vent  68  and air vent  74  may serve as an air intake that draws in air  70  to help cool components within conductive inner frame  54 . Air vent  75  may serve as an air exhaust that expels exhaust air  72  through bottom wall  42 B at the left of housing  38 . In this way, the components within device  10  may operate at a sufficiently low operating temperature even when device  10  is placed within a network rack, despite the presence of conductive outer sleeve  52 . This example is merely illustrative and, if desired, additional air vents may be formed on additional walls of housing  38 . 
     Electronic device handles  50 , conductive support plates  48 , portions of conductive inner frame  54 , and/or portions of conductive outer sleeve  52  may be used to form one or more slot antennas in device  10  (e.g., regardless of whether housing  38  is provided with an upright configuration as shown in  FIG. 3  or a rack-based configuration as shown in  FIG. 4 ). 
     An illustrative slot antenna for device  10  is shown in  FIG. 5 . As shown in  FIG. 5 , antenna  40  may include a conductive structure such as structure  78 . Conductive structure  78  may be provided with a dielectric-filled slot element as slot element  76 . Slot element  76  may serve as the antenna resonating element for antenna  40  and may sometimes be referred to herein as slot  76 , slot radiating element  76 , radiating element  76 , resonating element  76 , slot resonating element  76 , or slot antenna resonating element  76 . 
     Antenna  40  may be feed using antenna feed  32  coupled across slot element  76 . In particular, positive antenna feed terminal  34  and ground antenna feed terminal  36  of antenna feed  32  may be coupled to opposing sides of slot element  76  along the length  82  of slot element  76 . Radio-frequency antenna current may flow between antenna feed terminals  34  and  36  around the perimeter of slot element  76 . Corresponding radio-frequency signals may be radiated by slot element  76 . Similarly, radio-frequency signals received by antenna  40  may produce radio-frequency antenna currents around slot element  76  that are received by antenna feed  32 . Slot element  76  may have a width  80  perpendicular to length  82 . Width  80  may be less than length  82 . 
     The perimeter of slot element  76  (e.g., length  82  and width  80 ) may be selected to configure slot element  76  to radiate radio-frequency signals within desired frequency bands. For example, when length  82  is significantly greater than width  80  (e.g., when slot element  76  is long and narrow), length  82  may be approximately equal to (e.g., within 15% of) one-half of an effective wavelength of operation of antenna  40 . The effective wavelength of operation may be equal to the free space wavelength of the radio-frequency signals conveyed by antenna  40  multiplied by a constant factor that is determined based on the dielectric constant of the material within slot element  76 . Harmonic modes of slot element  76  may also be configured to cover additional frequency bands. 
     Antenna feed  32  may be coupled across slot element  76  at a distance from the left or right edge (side) of slot element  76  that is selected to match the impedance of antenna  40  to the impedance of the corresponding transmission line (e.g., transmission line  26  of  FIG. 1 ). For example, antenna current flowing around slot element  76  may experience an impedance of zero at the left and right edges of slot element  76  (e.g., a short circuit impedance) and an infinite (open circuit) impedance at the center of slot element  76  (e.g., at a fundamental frequency of the slot). Antenna feed  32  may be located between the center of slot element  76  and one of the left or right edges at a location where the antenna current experiences an impedance that matches the impedance of the corresponding transmission line (e.g., 50 Ohms). 
     Optional tuning components may be coupled to antenna  40 . As an example, one or more antenna tuning components such as illustrative component  84  of  FIG. 5  may bridge slot element  76 . Component  84  may be, for example, a tunable capacitor, a tunable inductor, a tunable component formed from a series of discrete components that can be selectively switched into or out of use with corresponding switching circuitry (e.g., a multiplexer coupled to a set of capacitors or a set of inductors to form, respectively, a tunable capacitor or tunable inductor), etc. In another suitable arrangement, component  84  may include fixed components such as a capacitor having a fixed capacitance, an inductor having a fixed inductance, and/or a resistor having a fixed resistance. Component  84  may have a first terminal coupled to conductive structure  78  on a first side of slot element  76  and a second terminal coupled to conductive structure  78  on an opposing second side of slot element  76  or may otherwise be coupled to conductive portions of antenna  40  and/or the circuitry associated with antenna  40  (e.g., matching circuits, etc.). Component  84  may be configured to adjust the frequency band of the radio-frequency signals conveyed by antenna  40 . 
     In some configurations, component  84  may be formed in an elongated threaded member (sometimes referred to as an antenna tuning circuit bolt). The transmission line for antenna  40  may also be coupled to antenna feed  32  using an elongated threaded member such as a bolt (sometimes referred to as an antenna feed bolt). An antenna feed bolt may have positive and ground portions (terminals) that couple to conductive structure  78  on opposing sides of slot element  76  and/or that are otherwise mounted to conductive structure  78 . The antenna feed bolt may be coupled to the transmission line using threaded radio-frequency connectors. If desired, other types of structures (e.g., brackets, screws, clips, springs, pins, conductive adhesive, welds, soldered terminals, etc.) may be used in coupling the transmission line to antenna feed  32  and in coupling component  84  to conductive structure  78 . 
     In the example of  FIG. 5 , slot element  76  is a closed slot because conductive structure  78  completely surrounds and encloses slot element  76 . In another suitable arrangement, slot element  76  may be an open slot element, as shown in  FIG. 6 . Slot element  76  of  FIG. 6  may be an open slot having an open end  86  that protrudes through conductive structure  78 . In scenarios where slot element  76  is an open slot, the length  82  of slot element  76  may be approximately equal to one-quarter of the effective wavelength of operation of antenna  40 . Harmonic modes of slot element  76  may also be configured to cover desired frequency bands. 
     It may be desirable for antennas  40  in device  10  to cover multiple frequency (communications) bands. In one suitable arrangement that is sometimes described herein as an example, the antennas in device  10  may be configured to cover a first frequency band (e.g., a 2.4 GHz WLAN or WPAN frequency band) and a second frequency band that is higher than the first frequency band (e.g., a 5 GHz WLAN frequency band). If desired, device  10  may include a first set of antennas  40  that cover the first frequency band and a second set of antennas  40  that cover the second frequency band. In another suitable arrangement, one or more antennas  40  may be provided with at least a first slot element  76  that is configured to convey radio-frequency signals in the first frequency band and at least a second slot element  76  that is configured to convey radio-frequency signals in the second frequency band. The first and second slot elements may have different perimeters that configure the slot elements to cover the different frequency bands, for example. Harmonic modes of the slot elements in antennas  40  may also configure the antennas to cover frequencies in the first and second frequency bands if desired. Combinations of these arrangements may be used, if desired, to cover frequencies in both the first and second frequency bands. Device  10  may include multiple antennas for covering each frequency band (e.g., using a multiple-input and multiple-output (MIMO) scheme). Use of a MIMO scheme may allow device  10  to maximize data throughput using antennas  40 . 
     Conductive structure  78  of  FIGS. 5 and 6  may be formed from electronic device handle  50 , conductive support plate  48 , a portion of conductive inner frame  54 , and/or a portion of conductive outer sleeve  52  of  FIGS. 2-4 . If desired, different conductive structures may be used to define different sides of slot element  76  (e.g., electronic device handle  50 , conductive support plate  48 , a portion of conductive inner frame  54 , and/or a portion of conductive outer sleeve  52  may each form different sides of slot element  76 ). 
       FIG. 7  is a top-down view showing how conductive support plate  48  of  FIGS. 3 and 4  may be used to form a pair of antennas  40 . In the example of  FIG. 7 , conductive support plate  48  is shown without electronic device handle  50 , conductive outer sleeve  52 , and conductive inner frame  54  of  FIGS. 3 and 4  for the sake of clarity. Two antennas  40  may be formed using slot elements in conductive support plate  48  (e.g., at the left and right sides of conductive support plate  48 ). Each antenna  40  may cover the same frequency bands (e.g., using a MIMO scheme). This example is merely illustrative and, if desired, conductive support plate  48  may include only a single antenna  40  or multiple antennas  40  that cover respective frequency bands. 
     As shown in  FIG. 7 , conductive support plate  48  may include a central portion  90  and a ring-shaped lip  88  extending around the periphery of central portion  90 . Central portion  90  may lie within a first lateral plane (e.g., parallel to the X-Y plane of  FIG. 7 ). Lip  88  may lie within a second lateral plane that extends parallel to the first lateral plane of central portion  90 . Central portion  90  may be raised with respect to lip  88  (e.g., central portion  90  may lie higher along the Z-axis than lip  88 ). A vertical conductive wall (not shown in  FIG. 7  for the sake of clarity) may extend parallel to the Z-axis and may couple central portion  90  to lip  88 . The vertical conductive wall may run around some or all of the periphery of central portion  90 . 
     When device  10  is fully assembled (e.g., as shown in  FIGS. 2 and 4 ), conductive support plate  48  may be aligned with a corresponding opening  46  in conductive outer sleeve  52 . The outline of opening  46  as defined by conductive outer sleeve  52  is shown by dashed line  96  of  FIG. 7 . Conductive outer sleeve  52  may overlap at least some of lip  88  without overlapping central region  90  of conductive support plate  48 . Central portion  90  may include a pair of openings (holes)  92 . Openings  92  may receive a corresponding electronic device handle  50 . The electronic device handle may be attached to conductive inner frame  54  ( FIGS. 3 and 4 ) through openings  92 . 
     As shown in  FIG. 7 , each antenna  40  may include a first slot element  76 H (e.g., a closed slot element such as slot element  76  of  FIG. 5 ) in central portion  90 . Each antenna  40  may also include second and third slot elements  76 L in conductive lip  88  (e.g., closed slot elements such as slot element  76  of  FIG. 5 ). Slot elements  76 L may be formed in lip  88  on opposing sides of the slot element  76 H in that antenna  40 . This example is merely illustrative and, if desired, antenna  40  may include only a single slot element  76 L. If desired, all of the edges of each slot element  76 L may be defined by lip  88 . In another suitable arrangement, one or more edges of each slot element  76 L may be defined by lip  88  while one or more other edges of the slot element  76 L are defined by central portion  90  and/or the vertical wall that couples central portion  90  to lip  88 . Slot elements  76 L each have longitudinal axes that extend parallel to the longitudinal axis of slot element  76 H. This is merely illustrative and, if desired, slot elements  76 H and  76 L may have other shapes (e.g., shapes having any desired number of straight and/or curved edges) and other relative orientations. 
     Each antenna  40  may be fed by a corresponding antenna feed coupled across slot element  76 H. For example, positive antenna feed terminal  34  and ground antenna feed terminal  36  may be coupled to central portion  90  of conductive support plate  48  at opposing sides of slot element  76 H. Slot elements  76 L may each have a length  98  (e.g., length  82  of  FIG. 5 ) that configures slot elements  76 L to radiate in the first frequency band (e.g., at 2.4 GHz). Slot element  76 H may have a length  100  (e.g., length  82  of  FIG. 5 ) that configures slot element  76 H to radiate in the second frequency band (e.g., at 5 GHz). Slot elements  76 L may therefore sometimes be referred to herein as low band slot elements  76 L whereas slot elements  76 H are sometimes referred to herein as high band slot elements  76 H. One or more tuning components (e.g., components  84  of  FIG. 5 ) such as tuning capacitor  94  of  FIG. 7  may be coupled across each low band slot element  76 L. Tuning capacitors  94  may serve to shift the radiating frequency of low band slot elements  76 L lower so that low band slot elements  76 L radiate in the first frequency band (e.g., tuning capacitors  94  may configure the slot elements to cover lower frequencies than the slot elements would otherwise cover for their given length  98  in the absence of tuning capacitors  94 ). The example of  FIG. 7  is merely illustrative and, in general, any desired tuning components may be used in place of tuning capacitors  94  (e.g., resistors, inductors, capacitors, etc.). Tuning components may be coupled across high band slot element  74 H if desired. 
     During signal transmission, radio-frequency signals in the first and second frequency bands may be transmitted over positive antenna feed terminal  34  and ground antenna feed terminal  36 . The transmitted radio-frequency signals may produce a corresponding antenna current I that runs around the perimeter of high band slot element  76 H. High band slot element  76 H may radiate the radio-frequency signals corresponding to antenna current I in the second frequency band. Antenna current I may also induce (e.g., via near-field electromagnetic coupling) a corresponding antenna current I′ in the first frequency band to flow around the perimeter of the low band slot elements  76 L. Low band slot elements  76 L may radiate the radio-frequency signals in the second frequency band corresponding to antenna current I′. Similarly, during signal reception, radio-frequency signals in the first frequency band may be received by low band lot elements  76 L and may produce antenna current I′ in the first frequency band around low band slot elements  76 L. Antenna current I′ may induce a portion of antenna current I around high band slot element  76 H. At the same time, radio-frequency signals in the second frequency band may be received by high band slot element  76 H and may produce an additional portion of antenna current I. The radio-frequency signals received in the first and second frequency bands may be passed to transceiver circuitry (e.g., radio-frequency transceiver circuitry  24  of  FIG. 1 ) via positive antenna feed terminal  34  and ground antenna feed terminal  36 . 
     The example of  FIG. 7  is merely illustrative. If desired, conductive support plate  48  may include more than two antennas  40 . Conductive support plate  48  may have other shapes (e.g., a rectangular shape, oval shape, circular shape, other shapes with curved and/or straight edges, combinations of these, etc.). Similar antennas  40  may be formed in each conductive support plate  48  of device  10  (e.g., for each electronic device handle  50  in device  10  as shown in  FIGS. 2-4 ). This may allow device  10  to perform communications using a MIMO scheme in both 2.4 GHz and 5.0 GHz frequency bands. If desired, the pair of low band slots elements  76 L in each antenna  40  may be formed from a single continuous slot that extends through lip  88  and around a respective one of openings  92 . In this arrangement, the presence of the electronic device handle in openings  92  may serve to electrically divide the single continuous slot into two portions (e.g., low band slot elements  76 L) having electrical lengths  98 . 
       FIG. 8  is a cross-sectional side view showing conductive support plate  48  while mounted within device  10  (e.g., as viewed along line AA′ of  FIG. 7 ). As shown in  FIG. 8 , conductive support plate  48  may include vertical walls  89  that extend from central portion  90  to lip  88 . Lip  88  may be mounted to a top surface of conductive inner frame  54 . Lip  88  may be adhered to conductive inner frame  54  using conductive adhesive, springs, clips, brackets, pins, solder, welds, or other interconnect structures. The interconnect structures may, if desired, electrically couple conductive support plate  48  to conductive inner frame  54  (e.g., so that conductive support plate  48  and conductive inner frame  54  collectively define conductive edges of a dielectric-filled cavity  102 ). Dielectric-filled cavity  102  may be filled with air, plastic, or other dielectric materials. Dielectric-filled cavity  102  may serve as a cavity-back that helps to optimize the gain and radiation pattern for antenna  40 . This example is merely illustrative and, if desired, conductive support plate  48  may be mounted to conductive inner frame  54  without adhesive. 
     Conductive support plate  48  may be aligned with opening  46  in top wall  42 T of conductive outer sleeve  52 . Conductive outer sleeve  52  may be placed over conductive inner frame and conductive support plate  48 . If desired, central portion  90  of conductive support plate  48  may lie flush with the outer surface of top wall  42 T. Conductive outer sleeve  52  may overlap some or all of lip  88 . A dielectric gasket such as gasket  108  may extend around the lateral periphery of central portion  90  of conductive support plate  48 . Gasket  108  may help keep the interior of device  10  free from contaminants and may help prevent damage to conductive outer sleeve  52  and conductive support plate  48  during assembly of device  10 . Gasket  108  may be formed from rubber, foam, plastic, ceramic, polymer, or any other desired dielectric materials. 
     Electronic device handle  50  may extend through openings in central portion  90  of conductive support plate  48  (e.g., openings  92  of  FIG. 7 ). Electronic device handle  50  may be secured to conductive inner frame  54 . Electronic device handle  50  may be secured to conductive inner frame  54  using solder, welds, adhesive, screws, pins, clips, springs, and/or any other desired conductive interconnect structures. In another suitable arrangement, electronic device handle  50  may include threaded ends that are screwed into threaded openings of conductive inner frame  54 . Electronic device handle  50  may be electrically coupled to conductive inner frame  54 . 
     High band slot element  76 H may be formed in central portion  90  of conductive support plate  48 . Low band slot elements  76 L may be formed in lip  88  (e.g., a respective low band slot element  76 L may be formed on either side of high band slot element  76 H). In the example of  FIG. 8 , low band slot elements  76 L are formed at the corner between vertical walls  89  and lip  88 . This is merely illustrative and, if desired, low band slot elements  76 L may be formed entirely within lip  88 , entirely within vertical walls  89 , at the corner between vertical walls  89  and central portion  90 , or entirely within central portion  90 . 
     A transmission line such as coaxial cable  106  may be used to feed antenna  40 . Coaxial cable  106  (e.g., a coaxial cable used to form transmission line  26  of  FIG. 1 ) may have a central signal conductor (e.g., signal conductor  28  of  FIG. 1 ) coupled to positive antenna feed terminal  34  at a first side of high band slot element  76 H. Coaxial cable  106  may have a ground conductor such as an outer shielding braid (e.g., ground conductor  30  of  FIG. 1 ) coupled to ground antenna feed terminal  36 . 
     In some scenarios (e.g., scenarios where conductive support plate  48  is formed from anodized aluminum), it can be difficult to solder components such as the signal and ground conductors of coaxial cable  106  to the conductive support plate. To help facilitate coupling between the antenna feed and coaxial cable  106 , antenna  40  may be provided with printed circuit board such as printed circuit board  104 . Printed circuit board  104  may be a rigid printed circuit board or a flexible printed circuit (e.g., a flexible printed circuit having polyimide or other flexible printed circuit substrate layers). Printed circuit board  104  may serve as an interposer between coaxial cable  106  and the antenna feed for antenna  40 . 
     Coaxial cable  106  may be mounted to a first side of printed circuit board  104 . An opposing second side of printed circuit board  104  may be mounted to conductive support plate  48 . Printed circuit board  104  may be secured to conductive support plate  48  using one or more conductive screws  107 . Conductive screws  107  may pass through printed circuit board  104  and may be received by threaded screw holes (e.g., screw standoffs) in conductive support plate  48 . If desired, other fastening structures such as adhesive may be used to help secure printed circuit board  104  to conductive support plate  48 . Conductive screws  107  may be used to couple conductive traces on printed circuit board  104  to conductive support plate  48 . For example, the signal conductor and ground conductor for coaxial cable  106  may be coupled to conductive traces on printed circuit board  104  (e.g., using solder). Conductive screws  107  may be used to couple the conductive traces for the signal conductor to positive antenna feed terminal  34  and to couple the conductive traces for the ground conductor to ground antenna feed terminal  36 . Tuning components (e.g., tuning capacitors  94  of  FIG. 7 ) may also be formed on printed circuit board  104  (e.g., using surface mount technology or other techniques). Conductive screws  107  may also be used to couple the terminals on the tuning components to different locations on conductive support plate  48  (e.g., to different sides of low band slot elements  76 L). 
     Antenna  40  may convey radio-frequency signals in the first frequency band using low band slot elements  76 L. Low band slot elements  76 L may transmit the radio-frequency signals  110  in the first frequency band through opening  46  and gasket  108 . When placed within opening  46 , central portion  90  of conductive support plate  48  may be laterally separated from conductive outer sleeve  52  by a ring-shaped gap that laterally extends around central portion  90  (e.g., a ring-shaped gap that is filled by gasket  108 ). The gap (e.g., gasket  108 ) may have a width (e.g., as measured parallel to the X-axis of  FIG. 8 ) that is sufficiently large so as to allow radio-frequency signals  110  to pass through the gap with satisfactory efficiency (e.g., greater than 1 mm, greater than 2 mm, greater than 3 mm, greater than 5 mm, etc.). Similarly, low band slot elements  76 L may receive the radio-frequency signals in the first frequency band through gasket  108 . High band slot element  76 H may transmit and receive the radio-frequency signals in the second frequency band and may indirectly feed low band slot elements  76 L in the first frequency band (e.g., via near-field electromagnetic coupling). Dielectric-filled cavity  102  may help to optimize the gain and radiation pattern of low band slot elements  76 L and high band slot element  76 H. In this way, almost the entirety of opening  46  and dielectric-filled cavity  102  may serve as a radiating volume for antenna  40 . This may configure antenna  40  to exhibit a relatively high antenna efficiency and bandwidth. 
     If desired, printed circuit board  104  may be used to couple separate transmission lines to each antenna  40  formed in conductive support plate  48 .  FIG. 9  is a bottom-up view of printed circuit board  104 . As shown in  FIG. 9 , printed circuit board  104  may have a lateral surface  114 . Surface  114  may face the conductive inner frame of device  10  (e.g., conductive inner frame  54  of  FIG. 8 ). Conductive ground traces  112  may be patterned on surface  114 . First and second coaxial cable  106  may each have ground conductors  118  that are soldered to conductive ground traces  112  using solder  116 . Conductive ground traces  112  may be coupled to ground traces on an opposing surface of printed circuit board  104  using one or more conductive through vias. Each coaxial cable  106  may convey radio-frequency signals for a corresponding one of the antennas in conductive support plate  48  (e.g., a respective one of the two antennas  40  shown in  FIG. 7 ). 
     Each coaxial cable  106  may have an inner signal conductor  120  coupled to a respective contact pad  122 . Contact pads  122  may each have an opening that overlaps a through-via in printed circuit board  104 . The opening and through via may receive a corresponding conductive screw (e.g., a given one of conductive screws  107  of  FIG. 8 ). The conductive screws may couple each contact pad  122  to a respective positive antenna feed terminal  34  on conductive support plate  48  while also helping to mechanically secure printed circuit board  104  in place on the conductive support plate. Screws may also be used to couple the conductive ground traces  112  for each coaxial cable  106  to a corresponding ground antenna feed terminal  36  on conductive support plate  48  if desired. 
     Antenna tuning components such as tuning capacitors  94  may also be formed on surface  114  of printed circuit board  104 . For example, tuning capacitors  94  may be surface-mount capacitors that are coupled to surface  114  of printed circuit board  104 . Each tuning capacitor  94  may have a first terminal coupled to a respective conductive ground trace  124  on surface  114  and a second terminal coupled to a corresponding conductive spring  128 . Each conductive ground trace  124  may include a corresponding opening  126  that overlaps a through-via in printed circuit board  104 . The opening and through via may receive a corresponding conductive screw (e.g., a given one of conductive screws  107  of  FIG. 8 ). The conductive screws may couple each conductive ground trace  124  to a first side of a respective low band slot element  76 L on conductive support plate  48  (e.g., while also helping to fasten the printed circuit board to the conductive support plate). Each conductive spring  128  may be coupled to the opposing side of that low band slot element  76 L. Conductive springs  128  may be pressed and biased against the conductive support plate to ensure that a reliable electrical and mechanical connection is provided between tuning capacitors  94  and the conductive support plate. In this way, tuning capacitors  94  may be coupled across low band slot elements  76 L in conductive support plate  48  (e.g., as shown in  FIG. 7 ). 
       FIG. 10  is a top-down view of printed circuit board  104 . As shown in  FIG. 10 , printed circuit board  104  may have a lateral surface  136  that opposes surface  114  of  FIG. 9 . Surface  136  may face central portion  90  of conductive support plate  48  ( FIG. 8 ). Conductive ground traces  130  may be patterned on surface  136 . Conductive ground traces  130  may overlap conductive ground traces  112  of  FIG. 9 . Conductive ground traces  130  may be shorted to conductive ground traces  112  by one or more conductive through vias extending through printed circuit board  104 . Conductive gaskets  134  may be soldered to conductive ground traces  130 . Conductive gaskets  134  may be pressed against the conductive support plate to help maintain a reliable electrical connection between the conductive ground traces and the conductive support plate. Conductive gaskets  134  may serve to ground conductive ground traces  130  and thus conductive ground traces  112  and ground conductor  118  for each coaxial cable  106  ( FIG. 9 ) to the conductive support plate along their lengths. 
     As shown in  FIG. 10 , printed circuit board  104  may include through vias  131 . Through vias  131  may be aligned with the openings in contact pads  122  of  FIG. 9 . Through vias  131  may each receive a conductive screw for coupling to the positive antenna feed terminals on the conductive support plate. Conductive ground traces  132  may also be formed on surface  136  in alignment with openings  126 . 
     The example of  FIGS. 9 and 10  is merely illustrative. If desired, additional tuning components such as additional tuning capacitors may be coupled across each low band slot. Printed circuit board  104  may have other shapes. Conductive springs  128  may be replaced with any desired conductive interconnect structures (e.g., conductive screws, conductive pins, conductive clips, conductive brackets, solder, welds, conductive adhesive, combinations of these, etc.). 
     Each antenna  40  in conductive support plate  48  may be fed using a corresponding positive antenna feed terminal  34  and ground antenna feed terminal  36 . In the example of  FIGS. 7-10 , each antenna  40  includes two low band slot elements  76 L and a high band slot element  76 H that are each fed using a single antenna feed coupled across the high band slot element. This is merely illustrative and, in another suitable arrangement, conductive support plate  48  may include different antennas for handling the first and second frequency bands. 
       FIG. 11  is a cross-sectional side view showing how conductive support plate  48  may include a first antenna  40 L for handling the first frequency band and a second antenna  40 H for handling the second frequency band. As shown in  FIG. 11 , conductive support plate  48  may be aligned with opening  46  in conductive outer sleeve  52 . Central portion  90  may be separated from top wall  42 T of conductive outer sleeve  52  by a first slot element  144  and a second slot element  146 . Slot elements  144  and  146  may be filled with a dielectric gasket, plastic, or other dielectric materials if desired. Conductive support plate  48  may also include a conductive structure such as conductive structure  138  that divides the space between conductive support plate  48  and inner conductive frame  54  into a first cavity  142  and a second cavity  140 . Cavity  142  may be larger than cavity  140 . 
     Slot element  144  may form the resonating element (e.g., slot element  76  of  FIGS. 5 and 6 ) for antenna  40 H. Slot element  144  may be fed by a positive antenna feed terminal  34  and a ground antenna feed terminal  36  coupled across slot element  144 . Slot element  146  may form the resonating element for antenna  40 L. Slot element  146  may be fed by a positive antenna feed terminal  34  and a ground antenna feed terminal  36  coupled across slot element  146 . Slot element  146  and cavity  142  may radiate in the first frequency band. Slot element  144  and cavity  140  may radiate in the second frequency band. Conductive support plate  48  may include two or more antennas  40 H and two or more antennas  40 L (e.g., two slot elements  144  and two slot elements  146  each fed by a respective antenna feed and transmission line) to perform communications using a MIMO scheme. The antenna arrangement of  FIG. 11  may, for example, require more space within device  10  to form each of the transmission lines for feeding each slot element  144  and each slot element  146  than in scenarios where a single antenna feed is used to feed both high and low band slots (e.g., as shown in  FIGS. 7-10 ). 
     If desired, portions of electronic device handle  50  may be used to form antennas  40 . In general, electronic device handle  50  may be formed from conductive material such as metal. The conductive material may be solid or may be hollow.  FIG. 12  is a cross-sectional side view showing how electronic device handle  50  may be used to form antenna  40  in a scenario where the electronic device handle is formed solid conductive material. 
     As shown in  FIG. 12 , electronic device handle  50  may be attached to conductive inner frame  54  through openings  92  in conductive support plate  48 . Electronic device handle  50  may protrude through opening  46  in top wall  42 T of conductive outer sleeve  52 . A slot element such as slot element  148  may be formed in electronic device handle  50 . Slot element  148  may form the resonating element for antenna  40  (e.g., an open slot such as slot element  76  of  FIG. 6 ). Slot element  148  may be filled with dielectric material  152 . Dielectric material  152  may include plastic, ceramic, glass, polymer, or other dielectric materials. Dielectric material  152  may have an external edge that lies flush with the external surfaces of electronic device handle  50 . 
     The antenna feed may be coupled across slot element  148 . For example, positive antenna feed terminal  34  may be coupled to electronic device handle  50  at a first side of slot element  148  whereas ground antenna feed terminal  36  is coupled to electronic device handle  50  at a second side of slot element  148 . If desired, one or more antenna tuning components (e.g., components  84  of  FIG. 6 ) such as inductor  150  may be coupled across slot element  148 . The length of slot element  148  (e.g., length  82  of  FIG. 6 ) and inductor(s)  150  may be selected to provide antenna  40  with desired radiating frequencies. The fundamental mode and/or harmonic mode(s) of slot element  148  may be used to cover both the first frequency band (e.g., at 2.4 GHz) and the second frequency band (e.g., at 5.0 GHz). While the example of  FIG. 13  only shows a single antenna  40  in electronic device handle  50 , electronic device handle  50  may also include a second antenna  40  formed from an additional slot element at end  153  of electronic device handle  50 . 
     Positive antenna feed terminal  34  and ground antenna feed terminal  36  may be coupled to a transmission line located (e.g., embedded) within electronic device handle  50 .  FIG. 13  is an exploded side view showing how slot element  148  may be fed within electronic device handle  50 . As shown in  FIG. 13 , electronic device handle  50  may include base portion  158 , central portion  156 , and top portion  154 . Base portion  158 , central portion  156 , and top portion  154  may each be formed using solid pieces of metal. Inductor  150  and dielectric material  152  of  FIG. 12  are omitted from  FIG. 13  for the sake of clarity. 
     Base portion  158  may be coupled to the conductive internal frame. A channel such as channel  166  may be formed in base portion  158 . Antenna  40  may be fed using transmission line  160 . Transmission line  160  may be located within channel  166 . Transmission line  160  may extend through base portion  158  to the interior of device  10  (e.g., to radio-frequency transceiver circuitry  24  of  FIG. 1 ). Transmission line  160  may be a coaxial cable having an inner signal conductor  162  coupled to positive antenna feed terminal  34  and an outer ground conductor  164  coupled to ground antenna feed terminal  36 . Ground conductor  164  may also be soldered to base portion  158  along some or all of its length. 
     During assembly, central portion  156  may be mounted to base portion  158  and top portion  154  may be mounted to central portion  156  of electronic device handle  50 , as shown by arrows  168  (e.g., to form a fully assembled electronic device handle  50  as shown in  FIG. 12 ). Central portion  156  may be secured to base portion  158  using welds, solder, conductive adhesive, and/or any other desired conductive interconnect structures. Similarly, top portion  154  may be secured to central portion  156  using welds, solder, conductive adhesive, and/or any other desired conductive interconnect structures. In another suitable arrangement, central portion  156  and top portion  154  may be formed from a single integral piece of metal. In this way, antenna  40  may be integrated within a solid metal electronic device handle  50  (e.g., external to the conductive outer sleeve) while also hiding the transmission line for antenna  40  from view and protecting the transmission line from damage. While  FIG. 13  illustrates a single antenna for the sake of clarity, an additional antenna may be formed using similar structures at end  153  of electronic device handle  50 . If desired, a thin dielectric layer or coating may be provided over electronic device handle  50  and slot element  148  to protect electronic device handle  50  from damage and to prevent contaminants from entering slot element  148 . Dielectric material  152  may be omitted if desired. 
       FIG. 14  is a perspective view showing how electronic device handle  50  may be used to form antenna  40  in a scenario where the electronic device handle is formed from hollow conductive material. As shown in  FIG. 14 , electronic device handle  50  may be formed from conductive material such as metal that surrounds an interior cavity  170 . Interior cavity  170  may be filled with air, plastic, and/or other dielectric materials. 
     A slot element such as slot element  172  may be formed in electronic device handle  50  (e.g., in the conductive material of electronic device handle  50  separating interior cavity  170  from the exterior of the electronic device handle). Slot element  172  may extend from edge (end)  174  to edge (end)  176 . Slot element  172  may form the resonating element for antenna  40  (e.g., slot element  172  may be a closed slot element such as slot element  76  of  FIG. 5 ). Slot element  172  may be filled with dielectric material if desired (e.g., a dielectric window that separates interior cavity  170  from the exterior of electronic device handle  50 ). 
     The antenna feed for antenna  40  may be coupled across slot element  172 . For example, positive antenna feed terminal  34  may be coupled to electronic device handle  50  at a first side of slot element  172  whereas ground antenna feed terminal  36  is coupled to electronic device handle  50  at a second side of slot element  172 . If desired, one or more antenna tuning components (e.g., tuning components  84  of  FIG. 5 ) such as inductor  171  may be coupled across slot element  172 . The length of slot element  172  (e.g., length  82  of  FIG. 5  or the length as measured from edge  174  to edge  176  of  FIG. 14 ) and inductor(s)  171  may be selected to configure antenna  40  to radiate in desired frequency bands. The fundamental mode and/or harmonic mode(s) of slot element  172  may configure antenna  40  to radiate in both the first frequency band (e.g., at 2.4 GHz) and the second frequency band (e.g., at 5.0 GHz). While the example of  FIG. 14  only shows a single antenna  40  in electronic device handle  50 , electronic device handle  50  may include a second antenna  40  formed from an additional slot element at an opposing end of the electronic device handle. 
     Positive antenna feed terminal  34  and ground antenna feed terminal  36  may be coupled to a transmission line located within interior cavity  170 .  FIG. 15  is a cross-sectional side view showing how slot element  172  may be fed using a transmission line within electronic device handle  50  (e.g., as viewed in the direction of line BB′ of  FIG. 14 ). As shown in  FIG. 15 , electronic device handle  50  may include a first conductive structure  178  and a second conductive structure  180  defining opposing sides of slot  172 . The lateral surfaces of conductive structures  178  and  180  define the edges of interior cavity  170 . While conductive structure  178  is shown separately from conductive structure  180  in  FIG. 15 , conductive structures  178  and  180  may be formed from different portions of the same integral conductive structure used to form electronic device handle  50  (e.g., conductive structures  178  and  180  may be joined together at edges  176  and  174  of slot element  172  as shown in  FIG. 14 ). 
     A printed circuit board such as printed circuit board  182  may be mounted within interior cavity  170 . Printed circuit board  182  may be secured (fastened) to the interior surface of conductive structure  178  using conductive screw  184  and may be secured to the interior surface of conductive structure  180  using conductive screw  186 . Conductive screw  184  be received by a threaded screw hole in conductive structure  178 . Conductive screw  186  may be received by a threaded screw hole in conductive structure  180 . Printed circuit board  182  may extend along the interior surface of conductive structures  178  and  180 . 
     The transmission line for antenna  40  (not shown in  FIG. 15  for the sake of clarity) may be coupled to printed circuit board  182 . The transmission line may include a signal conductor coupled to signal traces on printed circuit board  182  and a ground conductor coupled to ground traces on printed circuit board  182 . The ground conductor and ground traces may be coupled to conductive structure  180  at ground antenna feed terminal  36  using conductive screw  186 . The signal conductor and signal traces on printed circuit board  182  may be coupled to conductive structure  178  at positive antenna feed terminal  34  using conductive screw  184 . Conductive screws  186  and  184  may be screwed in place using a screw driver or drill bit extending through slot element  172 . 
     Antenna currents I may flow along the edges of slot element  172  between positive antenna feed terminal  34  and ground antenna feed terminal  36 . A corresponding electric field  188  may be produced within slot element  172 . The electric field vectors of electric field  188  may point parallel to the Z-axis of  FIG. 15  (e.g., slot element  172  may function as a closed slot antenna resonating element despite being located at the edge of electronic device handle  50 ). 
     If desired, printed circuit board  182  may extend along the entire length of slot element  172 . In this scenario, inductors  171  may also be mounted to printed circuit board  182  and conductive screws may be used to couple the inductors to conductive structures  178  and  180 . In another suitable arrangement, additional printed circuit boards may be formed within interior cavity for supporting inductors  171 . Inductors  171  may be coupled between conductive structures  178  and  180  without printed circuit boards if desired. Inductors  171  may be replaced with any desired antenna tuning components (e.g., capacitors, resistors, and/or inductors arranged in any desired manner). 
     The example of  FIG. 15  is merely illustrative. Slot element  172  may be provided with other shapes (e.g., shapes having any desired number of curved and/or straight edges). The transmission line may be coupled to positive antenna feed terminal  34  and ground antenna feed terminal  36  without an intervening printed circuit board if desired. If desired, a thin dielectric layer or coating may be provided over conductive structures  178  and  180  and over slot element  172  to protect electronic device handle  50  from damage and to prevent contaminants from entering interior cavity  170 . 
       FIG. 16  is a schematic diagram showing how slot element  172  of  FIGS. 14 and 15  may be configured to cover multiple frequency bands. Slot element  172  of  FIG. 16  has been flattened into a single plane for the sake of clarity. As shown in  FIG. 16 , slot element  172  has length  82  extending between edges  174  and  176 . Positive antenna feed terminal  34  and ground antenna feed terminal  36  are coupled across slot element  172  at a distance from edge  176  that is selected to match the impedance of antenna  40  to the impedance of the transmission line coupled to antenna  40 . 
     Slot element  172  may be characterized by multiple electromagnetic standing wave modes that are associated with different response peaks for antenna  40 . These discrete modes may be determined by the dimensions of slot element  172  (e.g., length  82 ). For example, the dimensions of slot element  172  may define the boundary conditions for electromagnetic standing waves in each of the standing wave modes that are excited on slot element  172  by antenna currents I conveyed over positive antenna feed terminal  34  and ground antenna feed terminal  36  and/or by received radio-frequency signals. Such standing wave modes of slot element  172  include a fundamental mode and one or more harmonics of the fundamental mode (i.e., so-called harmonic modes of slot element  172 ). Slot element  172  may exhibit antenna response peaks at frequencies associated with the fundamental mode and one or more of the harmonic modes of slot element  172  (e.g., where the harmonic modes are typically at multiples of the fundamental modes). 
     Curves  190 ,  192 , and  194  are shown on  FIG. 16  to illustrate some of the standing wave modes of slot element  172 . As shown in  FIG. 16 , curves  190 ,  192 , and  194  plot the voltage across slot element  172  (perpendicular to length  82 ) at different points along length  82 . Similarly, curves  190 ,  192 , and  194  may also represent the magnitude of the electric field within slot element  172  at different points along length  82  (e.g., where the electric field extends in a direction perpendicular to length  82 , as shown by electric field  188  of  FIG. 15 ). In each mode, nodes in the voltage distribution are present at edges  174  and  176  (e.g., length  82  establishes boundary conditions for the electromagnetic standing waves produced on slot element  172  in the different modes). 
     Curve  190  represents the voltage distribution across slot element  172  in the fundamental mode. As shown in  FIG. 16 , in the fundamental mode associated with curve  190 , the voltage across slot element  172  (e.g., in a direction parallel to edges  174  and  176 ) and the magnitude of the electric field reaches a maximum (e.g., an anti-node) at the center of slot element  172  (e.g., half way across length  82 ). Length  82  may establish the fundamental mode, where length  82  is approximately one-half of the corresponding wavelength of operation. The wavelength of operation may, for example, be an effective wavelength of operation based on the dielectric material within slot element  172 . 
     Curve  192  represents the voltage distribution across slot element  172  in a first harmonic mode. As shown in  FIG. 16 , in the first harmonic mode associated with curve  192 , the voltage across slot element  172  and the magnitude of electric field reach maxima (anti-nodes) at one-quarter and three-quarters of length  82  from edge  174 . At the same time, in the first harmonic mode the voltage across slot element  172  and the magnitude of the electric field are at a node (e.g., a minimum or zero-value) at the center of slot element  172 . Antenna  40  may exhibit a response peak associated with the first harmonic mode at a frequency that is approximately twice the frequency associated with the fundamental mode, for example. 
     Curve  194  represents the voltage distribution across slot element  172  in a second harmonic mode. As shown in  FIG. 16 , in the second harmonic mode associated with curve  194 , the voltage across slot element  172  and the magnitude of the electric field reach maxima (anti-nodes) at one-sixth, one-half, and five sixths of length  82  from edge  174 . At the same time, the voltage across slot element  172  and the magnitude of the electric field form nodes at one-third and two-thirds of length  82  from edge  174 . While the example of  FIG. 16  only shows three standing wave modes, higher order harmonics may be present on slot element  172  in practice. 
     The modes associated with curves  190 ,  192 , and/or  194  may support coverage in corresponding frequency bands for antenna  40 . In one suitable arrangement, the fundamental mode associated with curve  190  may configure slot element  172  to cover the first frequency band (e.g., at 2.4 GHz). Similarly, the harmonic mode associated with curve  192  may configure slot element  172  to cover some of the second frequency band (e.g., at 5 GHz). If care is not taken, slot element  172  may not exhibit sufficient bandwidth to cover all of the second frequency band (e.g., to cover frequencies from 5 GHz to 6 GHz with an antenna efficiency that exceeds a minimum threshold efficiency). The harmonic mode associated with curve  194  may configure slot element  172  to cover higher frequencies such as frequencies at the upper end of the second frequency band (e.g., to cover a frequency band centered at 5.8 GHz such that the harmonic modes associated with curves  192  and  194  collectively cover the entire range of frequencies from 5 GHz to 6 GHz with a satisfactory antenna efficiency). 
     Inductors  171  may tweak the frequencies covered by the fundamental mode associated with curve  190  and the harmonic mode associated with curve  192  (e.g., to cover a frequency band at 2.4 GHz and a frequency band at 5.1 GHz) without affecting the frequencies covered by the harmonic mode associated with curve  194 . For example, inductors  171  may be coupled across slot element  172  at locations along length  82  that correspond to the nodes of curve  194  (e.g., at locations where the harmonic mode associated with curve  194  exhibits electric field and voltage magnitude minima). However, at the same time, inductors  171  are coupled across slot elements  172  at locations where curves  192  and  190  do not exhibit nodes. Placing inductors  171  across slot element in this way may allow inductors  171  to tweak the frequency response associated with curves  190  and  192  without impacting the frequency response associated with curve  194 . 
     The example of  FIG. 16  is merely illustrative. In general, any desired number of any desired type of antenna tuning components may be coupled across slot element  172  at any desired locations. Similar fundamental and harmonic modes may also be used to configure slot element  148  of  FIGS. 12 and 13  to cover multiple frequency bands. Electronic device  10  may be provided with antennas  40  in conductive support plate  48  (e.g., as shown in  FIGS. 7 and 8 ), antennas formed within solid electronic device handles  50  (e.g., as shown in  FIGS. 12 and 13 ), and/or antennas formed within hollow electronic device handles  50  (e.g., as shown in  FIGS. 14-16 ). The locations of positive antenna feed terminal  34  and ground antenna feed terminal  36  in  FIGS. 7, 8, and 11-15  may be swapped if desired. The antennas in device  10  may exhibit satisfactory antenna efficiency despite the presence of the conductive outer sleeve. 
     The foregoing is merely illustrative and various modifications can be made to the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

Metadata:
Filing Date: 20190318
Publication Date: 20211019
Grant Date: 20211019
Priority Date: 20190318
Inventors: Barrera, Joel D.
GUTERMAN, Jerzy S.
PASCOLINI, MATTIA
Assignee: APPLE INC
CPC Classifications: [{"code": "H01Q13/18", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/2258", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01Q13/10", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/244", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/2258", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/44", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q13/10", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01Q1/2258", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01Q1/44", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01Q1/244", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 72515841