An antenna assembly with dual resonance excitation and an apparatus comprising the antenna assembly

Abstract

The invention allows an antenna assembly with dual resonance excitation. Combining a closed-slot radiator with a backed cavity results in simultaneously generating an in-phase slot mode and an out-of-phase hybrid cavity slot mode at different frequencies. Both resonances can be tuned independently which results in improved bandwidth and efficiency.

Description

[0001] AN ANTENNA ASSEMBLY WITH DUAL RESONANCE EXCITATION AND AN APPARATUS COMPRISING THE ANTENNA ASSEMBLY

[0002] TECHNICAL FIELD

[0003] The present disclosure relates to the field of antennas, and, more particularly, to an antenna assembly with dual resonance excitation and an apparatus comprising the antenna assembly.

[0004] BACKGROUND

[0005] As more functions are integrated into terminal devices, there is an increasing demand for various antennas operating across different frequency bands to meet these growing requirements. However, a thinner and lighter mobile phone with large display -to-body ratio is generally preferred by the market, which may cause a conflict between limited design space and the growing number of antennas.

[0006] Nowadays, slot antennas are widely used in terminal device antenna designs. However, in current antenna system arrangements, only a fundamental slot mode, such as a half- wavelength closed slot mode or a quarter- wavelength open slot mode, is typically used due to requirements posed by the compact size of a terminal device. This may result in a relatively narrow bandwidth for this kind of single-resonance slot antennas.

[0007] Accordingly, at least in some situations, there may be a need for solutions that allow wideband and / or multiband antenna designs for host devices (such as terminal devices and the like) without drawbacks, such as increasing the size of the host device or negatively affecting radiation properties of the antenna design.

[0008] SUMMARY

[0009] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. 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.

[0010] It is an object of the invention to allow an antenna assembly with dual resonance excitation. The foregoing and other objects are achieved by the features of the independent claims. Further implementation forms are apparent from the dependent claims, the description and the figures.

[0011] According to a first aspect, an antenna assembly is provided. The antenna assembly comprises a cavity structure defining a cavity. The cavity structure comprises a front wall, a top wall, a bottom wall, a back wall, a first side wall and a second side wall. The first side wall has a first extension that protrudes beyond the front wall. The second side wall has a second extension that protrudes beyond the front wall. The antenna assembly further comprises an electrically conductive frame that is arranged opposite the cavity structure and that is connected to the first extension and the second extension. The antenna assembly further comprises at least one shorting element that is arranged perpendicularly between the electrically conductive frame and the front wall to connect the front wall to the electrically conductive frame. The antenna assembly further comprises a top radiating slot configured between the top wall and the electrically conductive frame. The antenna assembly further comprises a bottom radiating slot configured between the front wall and the electrically conductive frame. The present disclosure allows combining a closed-slot radiator with a backed cavity which in turn allows simultaneously generating an in-phase slot mode and an out-of-phase hybrid cavity slot mode at different frequencies. Furthermore, both resonances can be tuned independently which results in improved bandwidth and efficiency. The at least one shorting element allows exciting the in-phase slot mode. The cavity functions as a feed structure for the out-of-phase hybrid cavity slot mode.In an implementation form of the first aspect, the antenna assembly further comprises a coupling slot that is arranged between the front wall and the top wall. The disclosed cavity allows generating an inherent cavity mode able to couple energy to the bottom radiating slot through the coupling slot.

[0012] In an implementation form of the first aspect, the antenna assembly further comprises a feeding port that is arranged within the coupling slot. This implementation form allows effectively feeding the antenna assembly.

[0013] In an implementation form of the first aspect, the back wall is directly connected to the top wall.

[0014] In an implementation form of the first aspect, the cavity structure further comprises one or more shorting pins for electrically connecting the back wall to the top wall. This implementation form allows configuring the whole cavity.

[0015] In an implementation form of the first aspect, the top radiating slot, the bottom radiating slot, and / or the cavity structure is filled at least partly with non-conductive material. This implementation form allows structural support for the disclosed antenna assembly, and also allows reducing the overall size of the disclosed antenna assembly.

[0016] In an implementation form of the first aspect, the non-conductive material comprises plastic. This implementation form allows structural support for the disclosed antenna assembly, and also allows reducing the overall size of the disclosed antenna assembly.

[0017] In an implementation form of the first aspect, a length of the top radiating slot and a length of the bottom radiating slot are defined at least by a distance between the first side wall and the second side wall. The length of the top radiating slot can be used to tune the frequency of the in-phase slot mode, while the frequency of the out-of-phase hybrid cavity slot mode can be stable. The out-of-phase hybrid cavity slot mode can be tuned by the lengths of both the cavity and the bottom radiating slot.

[0018] In an implementation form of the first aspect, the length of the top radiating slot and the length of the bottom radiating slot are further defined by a shape of the first extension and a shape of the second extension. The length of the top radiating slot can be used to tune the frequency of the in-phase slot mode, while the frequency of the out-of-phase hybrid cavity slot mode can be stable. The out-of-phase hybrid cavity slot mode can be tuned by the lengths of both the cavity and the bottom radiating slot.

[0019] In an implementation form of the first aspect, the top radiating slot and the bottom radiating slot are of substantially equal length longitudinally. The length of the top radiating slot can be used to tune the frequency of the in-phase slot mode, while the frequency of the out-of-phase hybrid cavity slot mode can be stable. The out-of-phase hybrid cavity slot mode can be tuned by the lengths of both the cavity and the bottom radiating slot.

[0020] In an implementation form of the first aspect, the top radiating slot and the bottom radiating slot are of substantially differing lengths longitudinally. The length of the top radiating slot can be used to tune the frequency of the in-phase slot mode, while the frequency of the out-of-phase hybrid cavity slot mode can be stable. The out-of-phase hybrid cavity slot mode can be tuned by the lengths of both the cavity and the bottom radiating slot.

[0021] In an implementation form of the first aspect, at least one of the at least one shorting element is arranged in a middle of a length of the bottom radiating slot. This implementation form allows excitation of the top slot, thereby generating the in-phase slot mode.In an implementation form of the first aspect, at least one of the at least one shorting element is arranged away from a middle of a length of the bottom radiating slot. This implementation form allows excitation of the top slot, thereby generating the in-phase slot mode.

[0022] In an implementation form of the first aspect, the antenna assembly is configured to function in a first frequency band, and the antenna assembly is integrated with an additional antenna assembly configured to function in a second frequency band. This implementation form allows integrating the disclosed antenna assembly with another antenna assembly working in a different frequency band.

[0023] According to a second aspect, a communication apparatus is provided. The communication apparatus comprises the antenna assembly according to the first aspect. The present disclosure allows combining a closed-slot radiator with a backed cavity which in turn allows simultaneously generating an in-phase slot mode and an out-of-phase hybrid cavity slot mode at different frequencies. Furthermore, both resonances can be tuned independently which results in improved bandwidth and efficiency. The at least one shorting element allows exciting the in-phase slot mode. The cavity functions as a feed structure for the out-of-phase hybrid cavity slot mode.

[0024] Many of the attendant features will be more readily appreciated as they become better understood by reference to the following detailed description considered in connection with the accompanying drawings.

[0025] DESCRIPTION OF THE DRAWINGS

[0026] In the following, example embodiments are described in more detail with reference to the attached figures and drawings, in which:

[0027] Fig. 1 is a diagram illustrating a communication apparatus and example positions in it for a disclosed antenna assembly; Figs. 2A to 2D are diagrams illustrating a disclosed antenna assembly;

[0028] Figs. 3A to 3C are diagrams further illustrating a disclosed antenna assembly;

[0029] Fig. 4 shows diagrams illustrating various configurations of disclosed antenna assemblies;

[0030] Fig. 5 shows diagrams illustrating various further configurations of disclosed antenna assemblies;

[0031] Fig. 6 is a diagram illustrating a further configuration of a disclosed antenna assembly;

[0032] Fig. 7 is a block diagram illustrating a communication apparatus;

[0033] Fig. 8 illustrates S-parameters and efficiency;

[0034] Figs. 9 A and 9B illustrate simulated electric fields;

[0035] Fig. 10 illustrates a topology diagram; and

[0036] Figs. 11A to 11C illustrate radiation patterns.

[0037] In the following, identical reference signs refer to identical or at least functionally equivalent features.

[0038] DETAILED DESCRIPTION

[0039] In the following description, reference is made to the accompanying drawings, which form part of the disclosure, and in which are shown, by way of illustration, specific aspects in which the invention may be placed. It is understood that other aspects may be utilized, and structural or logical changes may be made without departing from the scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, as the scope of the invention is defined in the appended claims.

[0040] For instance, it is understood that a disclosure in connection with a described method may also hold true for a corresponding device or system configured to perform the method and vice versa. For example, if a specific method step is described, acorresponding device may include a unit to perform the described method step, even if such unit is not explicitly described or illustrated in the figures. On the other hand, for example, if a specific apparatus is described based on functional units, a corresponding method may include a step performing the described functionality, even if such step is not explicitly described or illustrated in the figures. Further, it is understood that the features of the various example aspects described herein may be combined with each other, unless specifically noted otherwise.

[0041] Fig. 1 illustrates example communication apparatus 100 (described in more detail below in connection with Fig. 7), where various embodiments of the present disclosure may be implemented. As can be seen, in the example of Fig. 1 communication apparatus 100 is a smartphone. However, it is to be understood that the disclosure is not limited to smartphones. For example, communication apparatus 100 may comprise, e.g., a mobile communication device, a mobile phone, a tablet computer, a smart watch, smart glasses, a smart audio headset, an AR / VR / XR (augmented reality, virtual reality, extended reality) device, any hand-held, portable and / or wearable device, a television, a vehicle infotainment unit, or any combination thereof.

[0042] Positions 200_l to 200_4 represent examples of where disclosed antenna assembly 200 (described in more detail below) may be placed in communication apparatus 100. As can be seen, these positions may typically be located at the edges of communication apparatus 100.

[0043] As will be discussed in more detail below, at least some of the disclosed embodiments may allow A closed-slot structure with independent top and bottom slot apertures. This results in an antenna assembly that is easy to integrate with communication apparatuses, and that can be used to tune the working frequencies, resulting in wideband or dual-band characteristics.

[0044] At least some of the disclosed embodiments may further allow a shorting element added between an electrically conductive frame and a (feeding) front wall which enables generating two resonance modes, widening an impedance bandwidth, and improving efficiency.

[0045] At least some of the disclosed embodiments may further allow a backed cavity placed beside a radiating slot structure which works with a bottom radiating slot to generate a hybrid cavity slot mode, widening the bandwidth and improving the efficiency.

[0046] At least some of the disclosed embodiments may further allow a closed slot antenna working with the backed cavity making it possible to share a same aperture with another antenna working in different frequencies.

[0047] Next, example embodiments of antenna assembly 200 are described based on Figs. 2A to 2D, 3A to 3C, and 4 to 6. Some of the features of the described devices are optional features which provide further advantages.

[0048] Antenna assembly 200 comprises cavity structure 210 that defines cavity 250. Cavity structure 210 comprises front wall 211, top wall 212, bottom wall 213 (e.g., aluminium (Al)), back wall 214, first side wall 215 and second side wall 216. First side wall 215 has first extension 215X that protrudes beyond front wall 211. Second side wall 216 has second extension 216X that protrudes beyond front wall 211.

[0049] For example, top wall 212 may be a part of a bottom surface of a printed circuit board PCB), such as a PCB 160 (e.g., an antenna PCB, a main PCB, or a combined antenna and main PCB) of communication apparatus 100. For example, bottom wall 213 may be a part of bottom plate 170 of communication apparatus 100.Antenna assembly 200 further comprises electrically conductive frame 201 that is arranged opposite cavity structure 210 and that is connected to first extension 215X and second extension 216X. For example, electrically conductive frame 201 may be a part of electrically conductive (e.g., metal) frame 150 of communication apparatus 100.

[0050] Antenna assembly 200 further comprises at least one shorting element 202 that is arranged perpendicularly between electrically conductive frame 201 and front wall 211 to connect front wall 211 to electrically conductive frame 201. At least one shorting element 202 may be used to excite an in-phase slot mode.

[0051] Antenna assembly 200 further comprises top radiating slot 203 configured between top wall 212 and electrically conductive frame 201. Antenna assembly 200 further comprises bottom radiating slot 204 configured between front wall 211 and electrically conductive frame 201.

[0052] In other words, a closed slot may be formed by first extension 215X and second extension 216X between electrically conductive frame 201 and top wall 212 / front wall 211. The closed slot may include top radiating slot 203 and bottom radiating slot 204 which may either have the same length or differ in length, as described below in more detail. Cavity 250 may represent a backed cavity and may be placed beside the closed slot.

[0053] In yet other words, a closed slot radiator may be placed beside electrically conductive frame 201 (and optionally frame 150), and top radiating slot (or aperture) 203 and bottom radiating slot (or aperture) 204 of this closed slot radiator may be used to generate the in-phase slot mode and an out-of-phase hybrid cavity slot mode at different frequencies.

[0054] At least in some embodiments, antenna assembly 200 may further comprise coupling slot 205 that is arranged between front wall 211 and top wall 212 (e.g., the PCB bottom surface).

[0055] In other words, backed cavity 250 with coupling slot 205 is placed beside the closed slot radiator which may function as a feed structure for the out-of-phase hybrid cavity slot mode. Backed cavity 250 itself may generate an inherent cavity mode which may couple energy to the closed slot radiator through coupling slot 205.

[0056] As shown in Fig. 2C, a height of electrically conductive frame 201 may extend over top wall 212 because a PCB layer (the bottom surface of which top wall 212 may be a part of) may exist there. Alternatively, the height of electrically conductive frame 201 may be the same as that of cavity structure 210, or it may extend below bottom wall 213, or extend over / below both top wall 212 and bottom wall 213, depending on the architecture of communication apparatus 100.

[0057] At least in some embodiments, antenna assembly 200 may further comprise feeding port 206 that is arranged within coupling slot 205. In other words, feeding port 206 may be placed below top wall 212 (e.g., the PCB bottom surface).

[0058] At least in some embodiments, back wall 214 may be directly connected to top wall 212 to configure whole cavity 250. Alternatively, cavity structure 210 may further comprise one or more shorting pins 207 for electrically connecting back wall 214 to top wall 212 (e.g., the PCB bottom surface), that is, to provide an indirect connection between top wall 212 and back wall 214. For example, three shorting pins 207 may be used. Figs. 2A to 2D illustrate example embodiments with back wall 214 directly connected to top wall 212, and Figs. 3B to 4 illustrate example embodiments with shorting pins 207 to provide a connection between top wall 212 and back wall 214.

[0059] At least in some embodiments, top radiating slot 203, bottom radiating slot 204, and / or cavity structure 210 may be filled at least partly with non-conductive material. At least in some embodiments, top radiating slot 203, bottom radiating slot 204,and / or cavity structure 210 may be filled completely with the non-conductive material. For example, the non-conductive material may comprise plastic.

[0060] The filled plastic or the like in the closed slot 203, 204 and backed cavity 250 may be used to support antenna assembly 200 structure and also to reduce the overall size of antenna assembly 200 structure. When using plastic, it may have a dielectric constant of 2.9 and tan 5 of 0.009, for example. These values may differ depending on a case.

[0061] At least in some embodiments, a length of top radiating slot 203 and a length of bottom radiating slot 204 may be defined at least by a distance between first side wall 215 and second side wall 216.

[0062] At least in some embodiments, the length of top radiating slot 203 and the length of bottom radiating slot 204 may further be defined by a shape of first extension 215X and a shape of second extension 216X.

[0063] At least in some embodiments, top radiating slot 203 and bottom radiating slot 204 may be of substantially equal length longitudinally. Alternatively, top radiating slot 203 and bottom radiating slot 204 may be of substantially differing lengths longitudinally.

[0064] In other words, to configure top radiating slot 203 and bottom radiating slot 204 with different lengths, e.g., L-shaped first extension 215X and second extension 216X may be placed between electrically conductive frame 201 and cavity 250, as shown in example diagram 500A of Fig. 5. Other first and second extensions with different shapes to configure top radiating slot 203 and bottom radiating slot 204 with different lengths may also be used. Example diagram 500B of Fig. 5 shows an example with trapezoidal shapes for first extension 215X and second extension 216X. Alternatively, top radiating slot 203 and bottom radiating slot 204 may have a same length, as shown in example diagram 500C of Fig. 5.

[0065] At least in some embodiments, at least one of at least one shorting element 202 may be arranged in a middle of a length of bottom radiating slot 204, as shown in example diagram 400A of Fig. 4. At least in some embodiments, at least one of at least one shorting element 202 may be arranged away from a middle of a length of bottom radiating slot 204, as shown in example diagram 400B of Fig. 4. For example, the at least one of at least one shorting element 202 may be arranged away from the middle of the length of bottom radiating slot 204 within 5 millimeters. Furthermore, more than one shorting element 202 may be used, as shown in example diagram 400C of Fig. 4. All of these embodiments may generate the above-discussed two resonances.

[0066] At least in some embodiments, antenna assembly 200 may be configured to function in a first frequency band, and antenna assembly 200 may be integrated with additional antenna assembly 600 configured to function in a second frequency band.

[0067] In other words, because (backed) cavity 250 is formed by top wall 212 (e.g., the PCB bottom surface) and bottom wall 213 (e.g., bottom Al plate 170), disclosed antenna assembly 200 may be integrated with another antenna assembly 600 working in one or more different frequency bands. Fig. 6 shows an example for this shared-aperture embodiment. In this case, disclosed antenna assembly 200 may be used for a high-band (HB) antenna, while additional antenna assembly 600 may be used for a low-band (LB) antenna. E.g., low-pass high-stop filter circuit 610 may be connected to a middle grounding point.

[0068] At least in some embodiments, disclosed antenna assembly 200 may generate two resonances in the U6G (upper-6-GHz) band, including one slot mode around 6.5 GHz and a hybrid cavity slot mode around 7.1 GHz. With a simple matching circuit, an impedance bandwidth of antenna assembly 200 may cover from 6.4 to 7.2 GHz band. In a target NT 04 band (6.425-7.125 GHz),an average total efficiency may be better than -2.5 dB after matching, as illustrated in diagram 800 of Fig. 8 showing S-parameters and efficiency for an example of antenna assembly 200.

[0069] Diagram 900A of Fig. 9A illustrates a simulated electric field distribution in YoZ and XoZ planes at 6.5 GHz, and diagram 900B of Fig. 9B illustrates a simulated electric field distribution in YoZ and XoZ planes at 7.1 GHz. As can be seen from diagram 900A, at 6.5 GHz, a stronger E-field may be concentrated on top radiating slot 203, and the E fields at top radiating slot 203 and bottom radiating slot 204 are in phase. The feed can be equivalent to that across top radiating slot 203 through the stub between the outer frame and middle cavity wall (main function of the shorting stub), which indicates a slot mode is excited. As can be seen from diagram 900B, at 7.1 GEIz, stronger E-field is generated at bottom radiating slot 204, while a weaker out-of-phase E-field is observed along top radiating slot 203. For this mode, cavity 250 may be excited first, and then the coupled energy may get radiated across bottom radiating slot 204.

[0070] To clarify the disclosed working mechanism, a topology diagram for an example of antenna assembly 200 is shown in diagram 1000 of Fig. 10. Simulated far-field radiation patterns for an example of antenna assembly 200 are shown in diagram 1100A of Fig. 11A (6.4 GHz), diagram 1100B of Fig. 11B (6.8 GHz), and diagram 1100C of Fig. 11C (7.1 GHz). In the lower frequency band, in-phase slot mode is dominate, and a directional radiation pattern towards +z -direction may be observed. In a higher frequency such as 7.1 GHz, radiation from the out-of-phase hybrid cavity slot mode may become stronger, and the radiation pattern may be more towards -z -direction. In a middle frequency of 6.8 GHz, a hybrid mode with a bi-directional radiation pattern may be observed.

[0071] Meanwhile, both resonances may be tuned independently to achieve wideband or dual-band characteristics. The length of top radiating slot 203 may be used to tune the frequency of the in-phase slot mode, while the frequency of the out-of-phase hybrid cavity slot mode may be stable. The out-of-phase hybrid cavity slot mode may be tuned by both the length of (backed) cavity 250 and the length of bottom radiating slot 204.

[0072] Next, example embodiments of communication apparatus 100 are described based on Fig. 7. Some of the features of the described devices are optional features which provide further advantages.

[0073] Fig. 7 is a block diagram illustrating communication apparatus 100. Communication apparatus 100 comprises antenna assembly 200.

[0074] Communication apparatus 100 may further comprise one or more processors 101 and one or more memories 102 that may comprise computer program code. As discussed in more detail below, communication apparatus 100 may further comprise, e.g., digital camera 103, and / or display 104. Communication apparatus 100 may also include other elements not shown in Fig.

[0075] 7.

[0076] Although the communication apparatus 100 is depicted to include only one processor 101, the communication apparatus 100 may include more processors. In an embodiment, the memory 102 may be capable of storing instructions. Furthermore, the memory 102 may include a storage.

[0077] Furthermore, the processor 101 may be capable of executing the stored instructions. In an embodiment, the processor 101 may be embodied as a multi-core processor, a single core processor, or a combination of one or more multi-core processors and one or more single core processors. For example, the processor 101 may be embodied as one or more of various processing devices, such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing circuitry with or without an accompanying DSP, or various other processing devices including integrated circuits such as, for example, an applicationspecific integrated circuit (ASIC), a field programmable gate array (FPGA), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like. In an embodiment, the processor 101 may be configured to execute hard-coded functionality. In an embodiment, the processor 101 may be embodied as an executor of software instructions.

[0078] The memory 102 may be embodied as one or more volatile memory devices, one or more non-volatile memory devices, and / or a combination of one or more volatile memory devices and non-volatile memory devices. For example, the memory 102 may be embodied as semiconductor memories (such as mask ROM, PROM (programmable ROM), EPROM (erasable PROM), flash ROM, RAM (random access memory), etc.).

[0079] Further features of communication apparatus 100 related to antenna assembly 200 directly result from the features and parameters of antenna assembly 200 and thus are not repeated here.

[0080] According to an embodiment, communication apparatus 100 may comprise a processor or processor circuitry, such as for example a microcontroller, configured by program code to execute operations and functionality. Alternatively, or in addition, the functionality can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, illustrative types of hardware logic components that can be used include Field-programmable Gate Arrays (FPGAs), Application-specific Integrated Circuits (ASICs), Application-specific Standard Products (ASSPs), System-on-a-chip systems (SOCs), Complex Programmable Logic Devices (CPLDs), and Graphics Processing Units (GPUs).

[0081] Any range or device value given herein may be extended or altered without losing the effect sought. Also, any embodiment may be combined with another embodiment unless explicitly disallowed.

[0082] Although the subject matter has been described in language specific to structural features and / or acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as examples of implementing the claims and other equivalent features and acts are intended to be within the scope of the claims.

[0083] It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages. It will further be understood that reference to 'an' item may refer to one or more of those items.

[0084] Aspects of any of the embodiments described above may be combined with aspects of any of the other embodiments described to form further embodiments without losing the effect sought.

[0085] The term 'comprising' is used herein to mean including the method, blocks or elements identified, but that such blocks or elements do not comprise an exclusive list and a method or apparatus may contain additional blocks or elements.

[0086] It will be understood that the above description is given by way of example only and that various modifications may be made by those skilled in the art. The above specification, examples and data provide a complete description of the structure and use of exemplary embodiments. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the spirit or scope of this specification.

Claims

CLAIMS1. An antenna assembly (200), comprising:a cavity structure (210) defining a cavity (250) and comprising a front wall (211), a top wall (212), a bottom wall (213), a back wall (214), a first side wall (215) and a second side wall (216), the first side wall (215) having a first extension (215X) protruding beyond the front wall (211) and the second side wall (216) having a second extension (216X) protruding beyond the front wall (211);an electrically conductive frame (201) arranged opposite the cavity structure (210) and connected to the first extension (215X) and the second extension (216X);at least one shorting element (202) arranged perpendicularly between the electrically conductive frame (201) and the front wall (211 ) to connect the front wall (211 ) to the electrically conductive frame (201);a top radiating slot (203) configured between the top wall (212) and the electrically conductive frame (201); and a bottom radiating slot (204) configured between the front wall (211) and the electrically conductive frame (201).

2. The antenna assembly (200) according to claim 1, further comprising a coupling slot (205) arranged between the front wall (211) and the top wall (212).

3. The antenna assembly (200) according to claim 2, further comprising a feeding port (206) arranged within the coupling slot (205).

4. The antenna assembly (200) according to any of claims 1 to 3, wherein the back wall (214) is directly connected to the top wall (212).

5. The antenna assembly (200) according to any of claims 1 to 3, wherein the cavity structure (210) further comprises one or more shorting pins (207) for electrically connecting the back wall (214) to the top wall (212).

6. The antenna assembly (200) according to any of claims 1 to 5, wherein at least one of the top radiating slot (203), the bottom radiating slot (204), or the cavity structure (210) is filled at least partly with non-conductive material.

7. The antenna assembly (200) according to claim 6, wherein the non-conductive material comprises plastic.

8. The antenna assembly (200) according to any of claims 1 to 7, wherein a length of the top radiating slot (203) and a length of the bottom radiating slot (204) are defined at least by a distance between the first side wall (215) and the second side wall (216).

9. The antenna assembly (200) according to claim 8, wherein the length of the top radiating slot (203) and the length of the bottom radiating slot (204) are further defined by a shape of the first extension (215X) and a shape of the second extension (216X).

10. The antenna assembly (200) according to any of claims 1 to 9, wherein the top radiating slot (203) and the bottom radiating slot (204) are of substantially equal length longitudinally.

11. The antenna assembly (200) according to any of claims 1 to 9, wherein the top radiating slot (203) and the bottom radiating slot (204) are of substantially differing lengths longitudinally.

912. The antenna assembly (200) according to any of claims 1 to 11, wherein at least one of the at least one shorting element (202) is arranged in a middle of a length of the bottom radiating slot (204).

13. The antenna assembly (200) according to any of claims 1 to 11, wherein at least one of the at least one shorting element (202) is arranged away from a middle of a length of the bottom radiating slot (204).

14. The antenna assembly (200) according to any of claims 1 to 13, wherein the antenna assembly (200) is configured to function in a first frequency band, and the antenna assembly (200) is integrated with an additional antenna assembly (600) configured to function in a second frequency band.

15. A communication apparatus (100), comprising the antenna assembly (200) according to any of claims 1 to 14.

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