Hybrid Cavity Mode Antenna

Abstract

A communication device includes a metal chassis, a printed circuit board located within the metal chassis, and a hybrid cavity mode antenna. The hybrid cavity mode antenna includes a conductive wall defining at least a portion of a cavity and an electrically fed antenna, wherein the cavity is further defined by one or more surfaces of the metal chassis and the printed circuit board, and the electrically fed antenna is configured to radiate a first radio frequency signal within a first frequency range. The electrically fed antenna is electrically driven by the printed circuit board of the communication device. The electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

Description

Background Art

[0001] Existing Wi-Fi antenna designs in communication devices require a slot in a metal device housing or casing to enable antenna functionality (e.g., to isolate the antenna from the rest of the conductive metal casing to form a slot antenna). Industrial design constraints, manufacturing requirements, detuning issues, and other problems make such slots in metal device casings generally undesirable. Summary of the invention

[0002] The described technology provides a communication device, including a metal chassis, a printed circuit board located within the metal chassis, and a hybrid cavity mode antenna. The hybrid cavity mode antenna includes a conductive wall defining at least a portion of a cavity and an electrically fed antenna, wherein the cavity is also defined by one or more surfaces of the metal chassis and the printed circuit board, and the electrically fed antenna is configured to radiate a first radio frequency signal within a first frequency range. The electrically fed antenna is electrically driven by the printed circuit board of the communication device. The electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

[0003] This Summary is provided to introduce some concepts in a simplified form that are further described in the Detailed Description below. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0004] Other implementations are described and listed herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 A communication device including an example hybrid cavity mode antenna having a loop antenna and a cavity mode antenna is illustrated.

[0006] Figure 2 A perspective view of an example hybrid cavity mode antenna is illustrated.

[0007] Figure 3 A top view and three cross-sectional views of an example hybrid cavity mode antenna are illustrated.

[0008] Figure 4 Characteristics of an example hybrid cavity mode antenna are illustrated.

[0009] Figure 5 Example operating environments and systems for a hybrid cavity mode antenna are illustrated.

[0010] Figure 6 An example implementation of a hybrid cavity mode antenna is illustrated. DETAILED DESCRIPTION

[0011] The example antenna design provides a hybrid approach of using a loop antenna to excite a first RF signal (e.g., at a 5 GHz antenna response) and using a cavity mode antenna defined at least in part by a metal base of the communication device to excite a second RF signal (e.g., at a 2.5 GHz antenna response). The loop antenna is positioned within the boundaries of the cavity mode antenna. With this antenna topology, no slots are required in the metal base of the communication device to provide communications at these RF ranges, providing a very desirable industrial design appearance and mechanical strength superior to all previous designs.

[0012] Figure 1 A communication device 100 is illustrated that includes an example hybrid cavity mode antenna 102 having a loop antenna 104 and a cavity mode antenna 106. The loop antenna is electrically fed with an RF signal from a transmitter of the communication device 100. The example hybrid cavity mode antenna 102 is positioned within a metal base 108 of the communication device 100 and is inductively and / or capacitively fed by the loop antenna 104. Figure 1 1, the metal base 108 defines at least a portion of the cavity 110 (e.g., the two metal edge surfaces 103 and 105 and the back surface of the metal base 108 define at least two side walls and a back wall or bottom wall of the cavity 110, respectively). The communication device 100 also includes a display 112 and a printed circuit board 114 having a ground plane. The ground plane of the printed circuit board 114 defines a fourth wall of the cavity 110. The additional wall of the cavity 110 is defined by a conductive wall 118, which is referred to as Figure 2 , 3 In one implementation, the conductive wall 118 includes two grounded wall connectors 120 and 122 and a metal foam segment (indicated by a dashed line connecting the two grounded wall connectors 120, 122), but other implementations are also contemplated, including but not limited to a structural metal wall extending from a first metal edge surface through a metal back surface to a second metal edge surface (see Figure 6 ). In one implementation, surfaces of cavity 110 are electrically grounded.

[0013] The display 112 and some of its constituent components (collectively, the "display assembly") are used to substantially shield radio frequency (RF) radiation from leaving the communication device 100. In this manner, the display assembly is considered "RF opaque" with respect to RF radiation passing between the interior and exterior of the communication device 100, although the term may apply to materials or components that do not block all such radiation (e.g., a material that blocks substantially all or most RF radiation may be considered RF opaque).

[0014] Thus, the example hybrid cavity mode antenna 102 is positioned at or near a border region 116 where the shielding material is not located. Instead, the border region 116 is considered "RF transparent" because it passes most or all RF radiation between the interior and exterior of the communication device 100, but the term can be applied to materials or components that block a certain amount of such radiation (e.g., a material that passes substantially all or most RF radiation can be considered RF transparent or even RF translucent). The opening between the printed circuit board 114 and the metal base 108 presents a radiation slot in the cavity 110 from which radio frequency signals can radiate. The radiation slot is positioned to overlap or mostly overlap with the border region 116. In this way, the described implementation can operate as a cavity-backed slot antenna. The loop antenna 104 is positioned within the cavity, operates at approximately 5 GHz and drives the cavity and radiation slot at approximately 2.4 GHz.

[0015] As shown in exploded view 117, the example hybrid cavity mode antenna 102 is positioned near the edge of the communication device 100, wherein the loop antenna 104 is positioned in the bezel region 116 so that RF radiation can pass between the interior and exterior of the communication device 100 through the RF transparent bezel region 116. The loop antenna 104 is also positioned within the cavity 110 to excite the cavity mode of the cavity 110. It should be noted that the cavity 110 is also positioned at or near the bezel region 116 to radiate through the RF transparent material of the bezel region 116.

[0016] Also shown is a second hybrid cavity mode antenna 152 between the metal edge surface 105 and another metal edge surface 150. Additional hybrid cavity mode antennas may be employed in the same communication device 100. Furthermore, the location of such hybrid cavity mode antennas may also differ from the illustrated implementation. For example, the hybrid cavity mode antenna may be against the side of the metal chassis rather than being located at a corner of the metal chassis.

[0017] Figure 2 A perspective view of an example hybrid cavity mode antenna 200 in a communication device 200 is illustrated. All or most of the components of the communication device 202 are contained within a metal base 204. The boundaries of the cavity of the hybrid cavity mode antenna 200 are defined in two dimensions by conductive walls 203 (including ground connectors 210 and 212), a first metal edge surface 220 of the metal base 204, and a second metal edge surface 222 of the metal base 204. The bottom surface of the cavity is defined by the back metal surface of the metal base 204, and the top surface of the cavity is defined by the ground plane of the printed circuit board (PCB 206). The opening between the PCB 206 and the first metal edge surface 220 or the second metal edge surface 222 defines a radiation slot 252 in the cavity. One or more electrically fed antennas are positioned within the cavity. At Figure 2, loop antenna 208 is electrically driven by a feed from PCB 206 to radiate in a first radio frequency range (e.g., including 5 GHz), and is positioned within the cavity to inductively couple (and / or capacitively couple) to the cavity mode of the resulting cavity mode antenna in a second radio frequency range (e.g., including 2.5 GHz). A second loop antenna 254 is also shown on the left side of the cavity. Example electrically fed antennas may include, but are not limited to, loop antennas and monopole antennas.

[0018] exist Figure 2 2, the conductive wall 203 defines a portion of the cavity surface below the PCB 206. The conductive wall 203 may include one or more grounded wall connectors (see grounded wall connectors 210 and 212) that electrically connect the ground plane of the PCB 206 and the conductive wall 203 to the metal base 204 of the communication device 202. The size of the cavity substantially defined by the metal base 204, the ground plane of the PCB 206, and the conductive wall defines the volume of the cavity and thus contributes to the second radio frequency range radiated by the cavity.

[0019] The cavity driven antenna can be capacitively and / or inductively coupled to the cavity to drive the cavity to radiate. Various implementations may include multiple cavity driven antennas. For example, in one implementation, two loop antennas are positioned within the cavity, on opposite sides of the cavity. In other examples, one or more monopole antennas may be used to drive the cavity. In addition, multiple hybrid cavity mode antennas can be implemented in a single communication device.

[0020] In some implementations, the conductive wall 203 may also include a tuning circuit system 250, such as one or more inductive and / or capacitive elements, either of which may be variable or switchable, to dynamically adjust the tuning of the cavity antenna. It should also be understood that another conductive material may be used in place of the metal used for the chassis, foam, and other components. One or more tuning circuits may be used at various locations on the cavity wall.

[0021] Figure 3 A top view and three cross-sectional views of an example hybrid cavity mode antenna 300 are illustrated. The example hybrid cavity mode antenna 300 in a communication device includes a loop antenna 302 and a cavity antenna, the dimensions of which are defined by a cavity 304. The loop antenna 302 and at least a portion of the cavity 304 are positioned at or near a bezel region 303 of the communication device between a display 315 (covered by a cover glass 317) and a sidewall 306 and / or 308 of a metal base of the communication device. In one implementation, the loop antenna 302 radiates with a radio frequency signal in a first radio frequency range (e.g., 5 GHz).

[0022] exist Figure 3In a top plan view of the device, the dimensions of the cavity 304 are defined by the side walls 306 and 308 of the metal base of the communication device, the back wall 310 of the metal base, two grounded wall connectors 312 and 314, and the ground plane of the printed circuit board 316. A conductive wall 318 connects the two grounded wall connectors 312 and 314, the back wall 310 of the metal base, and the ground plane of the printed circuit board 316. In one implementation, the conductive wall 318 is formed of a metal foam that is both structural and rigid, but other conductive wall structures are contemplated, including but not limited to one or more metal or other conductive plates soldered to the printed circuit board 316 and the base surface. In one implementation, the loop antenna 302 is positioned within the cavity 304 and inductively coupled to the cavity 304 to radiate the cavity 304 (as a cavity antenna) with radio frequency signals in the second radio frequency range (e.g., 2.5 GHz). The grounded wall connectors 312 and 314 may also be made of metal foam, one or more conductive plates, etc.

[0023] Figure 4 The characteristic 400 of an example hybrid cavity mode antenna is illustrated. Lines 402 and 404 represent the antenna impedance of two different loop antennas, each loop antenna being located within the cavity mode antenna. Line 402 represents the impedance of the antenna when Figure 3 The return loss of the loop antenna located on the left side of the cavity when the cavity is viewed in plan view is shown in FIG. Figure 3 When viewing the cavity in plan view, it is located on the right side of the cavity (for example, Figure 3 4. The return loss of the loop antenna 302 is shown in FIG. 4. Line 406 represents the isolation between the two antennas, where the lower the isolation, the more efficiently the two antennas operate.

[0024] Figure 5 An example communication device 500 for implementing the features and operations of the described techniques is shown. The communication device 500 can be a client device, such as a laptop, mobile device, desktop, tablet; a server / cloud device; an Internet of Things device; an electronic accessory; or another electronic device. The communication device 500 includes one or more processors 502 and a memory 504. The memory 504 generally includes both volatile memory (e.g., RAM) and non-volatile memory (e.g., flash memory). An operating system 510 resides in the memory 504 and is executed by the processor(s) 502.

[0025] In the example communication device 500, as Figure 5As shown, one or more modules or segments, such as communication software 550, application modules, and other modules, are loaded into the operating system 510 on the memory 504 and / or storage 520 and executed by the processor 502. The storage 520 may store communication parameters and other data and may be local to the communication device 500, or may be remote and communicatively connected to the communication device 500.

[0026] The communication device 500 includes a power supply 516 that is powered by one or more batteries or other power sources and that provides power to the other components of the communication device 500. The power supply 516 may also be connected to an external power source that overrides or recharges the internal batteries or other power sources.

[0027] The communication device 500 may include one or more communication transceivers 530, which may be connected to one or more antennas 532 to provide network connectivity (e.g., mobile phone networks, ). The communication device 500 may further include a network adapter 536, which is a type of communication device. The communication device 500 may use the adapter and any other type of communication device to establish a connection on a wide area network (WAN) or a local area network (LAN). It should be understood that the network connections shown are exemplary and other communication devices and means for establishing a communication link between the communication device 500 and other devices may be used.

[0028] The communication device 500 may include one or more input devices 534 (e.g., a keyboard or mouse) so that a user can enter commands and information. These and other input devices may be coupled to a server via one or more interfaces 538 such as a serial port interface, a parallel port, a universal serial bus (USB), etc. The communication device 500 may also include a display 522, such as a touch screen display.

[0029] The communication device 500 may include a variety of tangible processor-readable storage media and intangible processor-readable communication signals. Tangible processor-readable storage may be embodied by any available medium that can be accessed by the communication device 500, and includes both volatile and non-volatile storage media, removable and non-removable storage media. Tangible processor-readable storage media do not include intangible communication signals, but rather include volatile and non-volatile, removable and non-removable storage media implemented in any method or technology for storing information such as processor-readable instructions, data structures, program modules or other data. Tangible processor-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other tangible medium that can be used to store the desired information and can be accessed by the communication device 500. In contrast to tangible processor-readable storage media, intangible processor-readable communication signals may embody processor-readable instructions, data structures, program modules or other data using modulated data signals such as carrier waves or other signal transmission mechanisms. The term "modulated data signal" means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, intangible communication signals include signals propagated through wired media (such as a wired network or direct-wired connection) and wireless media (such as acoustic, RF, infrared and other wireless media).

[0030] Figure 6 An example implementation of a hybrid cavity mode antenna in a communication device 600 is illustrated. All or most of the components of the communication device 600 are contained within a metal base (or other conductive base). A conductive wall 604 is shown connecting a first edge surface 606 of the metal base to a second edge surface 608 of the metal base, thereby forming a cavity within an area 610. The cavity is also bounded (above and below) by a bottom surface 612 of the metal base and a printed circuit board (not shown) of the communication device 600. These boundaries form a cavity volume. Figure 6 In the embodiment, the conductive wall 604 is formed of a metal plate, but one or more portions of the conductive wall 604 may be formed of a metal foam or other conductive material.

[0031] In the illustrated implementation, the cavity is defined by a first side 614 of the conductive wall 604 of approximately 40 mm and a second side 616 of the conductive wall 604 of approximately 86 mm. The opening between the metal base and the printed circuit board forms a slot in the cavity from which the RF signal can radiate. As such, the described implementation can operate as a cavity-backed slot antenna. A feed antenna (such as a loop antenna or a monopole antenna) would be positioned within the cavity, operating at approximately 5 GHz, and driving the cavity and radiating slot at approximately 2.5 GHz.

[0032] The cavity size and supported frequencies may vary in different implementations. In one implementation, 2.4 GHz corresponds to 15000 mm in this design. 3 The cavity mode of 5.2 GHz corresponds to 3990 mm in this design. 3 cavity modes, but other volumes, sizes and frequency bands may be used.

[0033] Although this specification contains many specific implementation details, these should not be interpreted as limitations on the scope of any invention or possible claimed content, but rather as descriptions of features specific to a particular embodiment of a particular description technology. In this specification, certain features described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, the individual features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any appropriate sub-combination. In addition, although features may be described above as acting in certain combinations and even initially claimed, one or more features from the claimed combination may be removed from the combination in some cases, and the claimed combination may be directed to a sub-combination, or a variant of a sub-combination.

[0034] Similarly, although the operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring that the operations be performed in the particular order shown or in a sequential order, or that all operations illustrated be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of the various system components in the above-described embodiments should not be understood as requiring such separation in all embodiments, but it should be understood that the described program components and systems can generally be integrated in a single software product or packaged into multiple software products.

[0035] An example communication device (100) includes a metal chassis (108), a printed circuit board (114) located within the metal chassis, and a hybrid cavity mode antenna (102). The hybrid mode antenna includes a conductive wall (118) that defines at least a portion of a cavity (110), wherein the cavity is further defined by one or more surfaces of the metal base and the printed circuit board. The hybrid cavity mode antenna also includes an electrically fed antenna (104) that is configured to radiate a first radio frequency signal within a first frequency range, wherein the electrically fed antenna is electrically driven from the printed circuit board of the communication device, and the electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

[0036] Another example communication device according to any of the foregoing devices is provided, wherein the metal base includes a metal back surface (310) and at least a first metal edge surface (606) and a second metal edge surface (608), and the cavity is defined by the metal back surface, the first metal edge surface, the second metal edge surface, the printed circuit board and the conductive wall.

[0037] Another example communication device according to any preceding device is provided, wherein the conductive wall includes a tuning circuit (250) connecting the conductive wall to at least one of the first metal edge surface and the second metal edge surface.

[0038] Another example communication device according to any of the foregoing devices is provided, wherein the communication device includes a display (112) and a bezel area (116) between the display and the first metal edge surface, and the cavity includes a radiation slot (252) located in the bezel area.

[0039] Another example communication device according to any preceding device is provided, wherein the conductive wall includes at least one grounded wall connector (212) electrically connected to the first metal edge surface.

[0040] Another example communication device is provided as in any preceding device, wherein the metal base includes a metal back surface, and the conductive wall is positioned between the printed circuit board and the metal back surface.

[0041] Another example communication device according to any of the aforementioned devices is provided, wherein the metal base includes a metal back surface and at least a first metal edge surface and a second metal edge surface, and the conductive wall extends from the first metal edge surface through the metal back surface to the second metal edge surface.

[0042] Another example communication device according to any preceding device is provided, wherein the conductive wall electrically connects the metal back surface, the first metal edge surface, and the second metal edge surface.

[0043] Another example communication device according to any of the preceding devices is provided, wherein the electrically fed antenna is a first electrically fed antenna, and the communication device further comprises: a second electrically fed antenna (254) configured to radiate a third radio frequency signal within the first frequency range, wherein the second electrically fed antenna is electrically driven from the printed circuit board of the communication device, the second electrically fed antenna being positioned within the cavity to drive the cavity to radiate the second radio frequency signal within the second frequency range.

[0044] There is provided another example communication device as in any preceding device, wherein the second electrically fed antenna is a loop antenna.

[0045] There is provided another example communication device as in any preceding device, wherein the second electrically fed antenna is a monopole antenna.

[0046] There is provided another example communication device as in any preceding device, wherein the first electrically fed antenna is positioned on one side of the cavity and the second electrically fed antenna is positioned on an opposite side of the cavity.

[0047] There is provided another example communication device as in any preceding device, wherein the first electrically fed antenna is a loop antenna.

[0048] Another example communication device is provided as in any preceding device, wherein the conductive wall comprises metal foam.

[0049] Another example communication device according to any of the foregoing devices is provided, wherein the metal base includes a metal back surface and at least a first metal edge surface, a second metal edge surface and a third metal edge surface (150), the hybrid cavity mode antenna is a first hybrid cavity mode antenna, wherein a conductive wall extends from the first metal edge surface through the metal back surface to the second metal edge surface, and the communication device also includes a second hybrid cavity mode antenna (152), the second hybrid cavity mode antenna including a second conductive wall extending from the first metal edge surface through the metal back surface to the third metal edge surface.

[0050] An example hybrid cavity mode antenna (102) includes a conductive base (108) of a communication device (100), the conductive base having a conductive back surface (310), a first conductive edge surface (606), and a second conductive edge surface. The example hybrid cavity mode antenna also includes a conductive wall (118) defining at least a portion of a cavity (110), wherein the cavity is further defined by the conductive back surface, the first conductive edge surface, and the second conductive edge surface of the conductive base, and an electrically fed antenna (104) configured to radiate a first radio frequency signal within a first frequency range, wherein the electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

[0051] Another example hybrid cavity mode antenna according to any preceding antenna is provided, wherein the electrically fed antenna is a loop antenna.

[0052] Another example hybrid cavity mode antenna according to any preceding antenna is provided, wherein the conductive wall electrically contacts the conductive back surface, the first conductive edge surface, and the second conductive edge surface.

[0053] Another example hybrid cavity mode antenna is provided according to any preceding antenna, wherein the conductive wall includes at least one ground wall connector (212) electrically connected to the first conductive edge surface.

[0054] Another example hybrid cavity mode antenna is provided according to any preceding antenna, wherein the conductive wall comprises conductive foam.

[0055] Thus, particular embodiments of the subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Additionally, the processes described in the accompanying drawings do not necessarily require the particular order or sequence shown to achieve the desired results. In some implementations, multitasking and parallel processing may be advantageous.

[0056] Several implementations of the described technology have been described. However, it should be understood that various modifications can be made without departing from the spirit and scope of the appended claims.

Claims

1. A communication device, comprising: Metal base; a printed circuit board located within the metal base; as well as A hybrid cavity mode antenna, the hybrid cavity mode antenna comprising: a conductive wall defining at least a portion of a cavity, wherein the cavity is further defined by one or more surfaces of the metal base and the printed circuit board, wherein the metal base includes a metal surface that is substantially parallel to a surface of the printed circuit board and the conductive wall and the cavity are located between the surface of the printed circuit board and the metal surface, and an electrically fed antenna configured to radiate a first radio frequency signal within a first frequency range, wherein the electrically fed antenna is electrically driven from the printed circuit board of the communication device, and the electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

2. The communication device according to claim 1, characterized in that The metal base includes a metal back surface and at least a first metal edge surface and a second metal edge surface, and the cavity is defined by the metal back surface, the first metal edge surface, the second metal edge surface, the printed circuit board, and the conductive wall.

3. The communication device according to claim 2, characterized in that The conductive wall includes a tuning circuit connecting the conductive wall to at least one of the first metal edge surface and the second metal edge surface.

4. The communication device according to claim 2, characterized in that The communication device includes a display and a bezel region between the display and the first metal edge surface, and the cavity includes a radiating slot in the bezel region.

5. The communication device according to claim 2, characterized in that The conductive wall includes at least one grounded wall connector electrically connected to the first metal edge surface.

6. The communication device according to claim 1, characterized in that The metal base includes a metal back surface, and the conductive wall is positioned between the printed circuit board and the metal back surface.

7. The communication device according to claim 1, characterized in that The metal base includes a metal back surface and at least a first metal edge surface and a second metal edge surface, the conductive wall extending from the first metal edge surface through the metal back surface to the second metal edge surface.

8. The communication device according to claim 7, characterized in that: The conductive wall electrically connects the metal back surface, the first metal edge surface, and the second metal edge surface.

9. The communication device according to claim 1, characterized in that The electrically fed antenna is a first electrically fed antenna, and the communication device further comprises: a second electrically fed antenna configured to radiate a third radio frequency signal within the first frequency range, wherein the second electrically fed antenna is electrically driven from the printed circuit board of the communication device, and the second electrically fed antenna is positioned within the cavity to drive the cavity to radiate the second radio frequency signal within the second frequency range.

10. The communication device according to claim 9, characterized in that The second electrically fed antenna is a loop antenna.

11. The communication device according to claim 9, characterized in that The second electrically fed antenna is a monopole antenna.

12. The communication device according to claim 9, characterized in that The first electrically fed antenna is positioned on one side of the cavity and the second electrically fed antenna is positioned on an opposite side of the cavity.

13. The communication device according to claim 9, characterized in that The first electrically fed antenna is a loop antenna.

14. The communication device according to claim 1, characterized in that The conductive wall comprises metal foam.

15. The communication device according to claim 1, characterized in that The metal base comprises a metal back surface and at least a first metal edge surface, a second metal edge surface and a third metal edge surface, the hybrid cavity mode antenna is a first hybrid cavity mode antenna, wherein the conductive wall extends from the first metal edge surface through the metal back surface to the second metal edge surface, and the communication device further comprises: A second hybrid cavity mode antenna includes a second conductive wall extending from the first metal edge surface through the metal back surface to the third metal edge surface.

16. A hybrid cavity mode antenna, comprising: A conductive base for a communication device, the conductive base having a conductive back surface, a first conductive edge surface, and a second conductive edge surface; a printed circuit board positioned within the conductive base; a conductive wall defining at least a portion of a cavity, wherein the cavity is further defined by the printed circuit board, the conductive back surface, the first conductive edge surface, and the second conductive edge surface of the conductive base, wherein the conductive base includes a conductive back surface that is substantially parallel to a surface of the printed circuit board, and the conductive wall and the cavity are positioned between the surface of the printed circuit board and the conductive back surface; as well as An electrically fed antenna is configured to radiate a first radio frequency signal within a first frequency range, wherein the electrically fed antenna is positioned within the cavity to drive the cavity to radiate a second radio frequency signal within a second frequency range.

17. The hybrid cavity mode antenna according to claim 16, characterized in that: The electrically fed antenna is a loop antenna.

18. The hybrid cavity mode antenna according to claim 16, characterized in that: The conductive wall electrically contacts the conductive back surface, the first conductive edge surface, and the second conductive edge surface.

19. The hybrid cavity mode antenna according to claim 16, characterized in that: The conductive wall includes at least one grounded wall connector electrically connected to the first conductive edge surface.

20. The hybrid cavity mode antenna according to claim 16, characterized in that: The conductive wall includes conductive foam.

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