Cavity antenna and electronic equipment

Abstract

The invention provides a cavity antenna and electronic equipment, and relates to the technical field of antenna structures. The cavity antenna comprises a metal shell, the metal shell is provided with a cavity and a first opening which are communicated, the cavity is provided with a first cavity wall and a second cavity wall which are opposite, and the height of the first cavity wall is larger than that of the second cavity wall; the first dielectric substrate is arranged on the first opening in a covering manner; and the radiation branch knot is arranged on the first dielectric substrate, and the radiation branch knot is used for being electrically connected with the feeding point so as to excite cavity resonance and radiate electromagnetic waves. The cavity antenna has an irregular structure, can excite double modes of a feed branch mode and a cavity mode, and is wide in application range of a terminal.

Description

Technical Field

[0001] This application relates to the field of antenna structure technology, and in particular to a cavity antenna and electronic device. Background Technology

[0002] Currently, antennas for terminal devices such as laptops and tablets typically adopt an all-metal design. Among them, all-metal antennas use a resonant cavity structure to ensure antenna performance. In order to achieve multi-band resonant coverage, the shape of the resonant cavity antenna is mostly a standard shape such as a cuboid, which makes it easier to excite multiple resonant modes of the cavity. However, the internal space of terminal products is relatively compact, and it is often impossible to reserve independent installation space for installing a standard cuboid antenna. That is, the application range of cavity antennas in related technologies is greatly limited. Summary of the Invention

[0003] This application provides a cavity antenna and an electronic device. The cavity antenna has an irregular structure and can excite dual modes, namely the feed stub mode and the cavity mode, which has a wide range of applications in terminals.

[0004] In a first aspect, this application provides a cavity antenna, which includes a metal housing, the metal housing having a communicating cavity and a first opening, the cavity having opposing first cavity walls and second cavity walls, the height of the first cavity wall being greater than the height of the second cavity wall;

[0005] A first dielectric substrate, the first dielectric substrate being disposed over the first opening;

[0006] A radiating stub is disposed on the first dielectric substrate. The radiating stub is electrically connected to the feed point to excite the cavity to resonate and radiate electromagnetic waves.

[0007] In some embodiments, along the height direction of the metal housing, the metal housing has opposing first and second surfaces, the plane containing the first surface and the plane containing the second surface intersecting.

[0008] In some embodiments, the metal housing has a first side surface near the first cavity wall, the height of which is greater than or equal to 5 mm.

[0009] In some embodiments, the metal housing includes a first metal housing and a second metal housing, the first metal housing is connected to the second metal housing, the inner cavity of the first metal housing is connected to the inner cavity of the second metal housing, and one side of the inner cavity of the first metal housing is the second cavity wall;

[0010] The inner cavity of the second metal housing is one side of the first cavity wall, the first opening is formed on the second metal housing, and the second metal housing has the first side surface.

[0011] In some embodiments, the first metal housing has opposing third and fourth surfaces, the plane containing the third surface and the plane containing the fourth surface intersecting.

[0012] In some embodiments, the second metal housing further has a second side opposite to the first side, the first side being connected to the fourth surface, and the second side being connected to the third surface;

[0013] The distance from the end of the second side surface connected to the third surface to the fourth surface is greater than or equal to 1 mm.

[0014] In some embodiments, the first metal housing has opposing third and fourth surfaces, the plane containing the third surface and the plane containing the fourth surface intersecting.

[0015] In some embodiments, the first dielectric substrate includes a first sub-board and a second sub-board connected together, a second opening is provided on the first side, the first sub-board covers the first opening, the second sub-board covers the second opening, and the second sub-board is provided with the radiating branches.

[0016] In some embodiments, the fourth surface is provided with a third opening, and the fourth surface is also provided with a metal connector located to the side of the third opening for grounding.

[0017] In some embodiments, when the length of the radiating stub is less than λ / 8, the resonant frequency of the cavity is 2.4 GHz; when the length of the radiating stub is less than λ / 4, the resonant frequency of the cavity is 5.8 GHz, where λ is the wavelength corresponding to the center frequency of the resonant frequency of the cavity.

[0018] The cavity antenna provided in the first aspect of this application has at least the following beneficial effects:

[0019] The cavity antenna provided in this application features an irregular structure with multiple resonant modes. This is achieved by integrating the cavity antenna into the terminal device design, tailoring its structural shape to the shape of the space within the device where the antenna can be installed. This breaks the limitations of regular shapes in cavity antennas. Specifically, the antenna's metal casing has two opposing cavity walls of unequal height, resulting in an unequal height structure when the cavity antenna is installed inside the terminal device. In other words, designing the cavity antenna to fit the environment effectively improves its structural application limitations in terminal products. Furthermore, by designing the height of the first side of the metal casing to be greater than or equal to 5 mm, both the feed stub mode and the cavity mode can be excited simultaneously. On one hand, this ensures that the electromagnetic waves within the cavity can form a stable resonant mode within this size range, effectively exciting the cavity mode. On the other hand, the cavity of the metal casing provides sufficient space and path for the electromagnetic waves introduced at the feed point to effectively propagate and resonate within the antenna structure, exciting the feed stub mode. This eliminates the electromagnetic performance degradation caused by the irregular structure of the antenna casing, ultimately achieving a satisfactory irregular cavity antenna design.

[0020] Secondly, this application provides an electronic device that includes a cavity antenna provided by any of the solutions in the first aspect.

[0021] Since the electronic device provided in this aspect includes cavity antennas of all the schemes of the first aspect, and also possesses all the beneficial effects of cavity antennas of the first aspect, it will not be described in detail here. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] Figure 1 This is a schematic diagram of the cavity antenna structure according to an embodiment of this application;

[0024] Figure 2 for Figure 1 A top-view structural diagram;

[0025] Figure 3 for Figure 1 A schematic diagram of the side view structure;

[0026] Figure 4 To show Figure 1 A schematic diagram of the bottom structure of the cavity antenna;

[0027] Figure 5 This is a schematic diagram illustrating the structure of the metal connector of the cavity antenna according to an embodiment of this application;

[0028] Figure 6 for Figure 5A schematic diagram of the cavity antenna from below;

[0029] Figure 7 for Figure 1 Simulated return loss curve of cavity antenna;

[0030] Figure 8 for Figure 1 The internal electric field distribution of the cavity antenna at 2.5 GHz;

[0031] Figure 9 for Figure 1 The internal electric field distribution of the cavity antenna at 5.69 GHz;

[0032] Figure 10 This is a schematic diagram of the cavity antenna in the form of an IFA (Integrated Focal Atom) according to an embodiment of this application.

[0033] Figure 11 for Figure 10 A schematic diagram of the cavity antenna with its IFA radiating stub located on the first side.

[0034] Figure 12 This is a schematic diagram of the structure of the cavity antenna in this application, where the length of the second metal shell is less than that of the first metal shell;

[0035] Figure 13 This is a schematic diagram illustrating the inclined first surface of the metal housing of the cavity antenna according to an embodiment of this application;

[0036] Figure 14 This is a schematic diagram illustrating the structure of the metal housing of the cavity antenna according to an embodiment of this application, where both the first and second surfaces are inclined.

[0037] Figure 15 This is a schematic diagram showing the tilted third surface of the first metal housing of the cavity antenna according to an embodiment of this application;

[0038] Figure 16 This is a schematic diagram of the structure of the cavity antenna according to an embodiment of this application, where both the third and fourth surfaces of the first metal housing are inclined.

[0039] Figure 17 This is a schematic diagram showing the structure of the cavity antenna in an embodiment of this application, where the third and fourth surfaces of the first metal housing are parallel.

[0040] Figure 18 This is a schematic diagram of the tilted fourth surface of the first metal housing of the cavity antenna according to an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 - Metal casing;

[0043] 110-Cavity;

[0044] 111 - First cavity wall; 112 - Second cavity wall;

[0045] 120 - First opening;

[0046] 130 - First side view;

[0047] 131 - Second opening;

[0048] 140 - First surface;

[0049] 150 - Second surface;

[0050] 101 - First metal casing;

[0051] 1011 - Third surface; 1012 - Fourth surface; 1013 - Third opening; 1014 - Metal connector;

[0052] 1015 - Third side view;

[0053] 102 - Second metal casing; 1021 - Second side surface;

[0054] 200 - First dielectric substrate;

[0055] 210 - First sub-board; 220 - Second sub-board;

[0056] 300-radiating branches.

[0057] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0058] As described in the background section, antennas in current terminal devices such as laptops and tablets typically employ an all-metal design. These all-metal antennas utilize a resonant cavity structure to ensure antenna performance. In related technologies, resonant cavity antennas are mostly cuboid in shape. However, the internal space of terminal products is relatively compact, often making it impossible to reserve installation space for a cuboid antenna. This limits the application scope of cavity antennas in related technologies.

[0059] To address the aforementioned technical problems, this invention integrates the cavity antenna into the terminal device design. The structural shape of the cavity antenna is designed based on the shape of the space within the terminal device where the antenna can be installed, breaking the limitations of the regular shape of cavity antennas. Specifically, the antenna's metal casing has two opposing cavity walls of unequal height, allowing the cavity antenna to present an unequal height structure after being installed inside the terminal device. In other words, by designing the cavity antenna to fit the environment, its structural application limitations in terminal products are effectively improved. Furthermore, by designing the height of the first side of the metal casing to be greater than or equal to 5 mm, both the feed stub mode and the cavity mode can be excited simultaneously. On the one hand, this ensures that the electromagnetic waves within the cavity can form a stable resonant mode within this size range, effectively exciting the cavity mode. On the other hand, the cavity of the metal casing provides sufficient space and path for the electromagnetic waves introduced by the feed point to effectively propagate and resonate within the antenna structure, exciting the feed stub mode. This eliminates the electromagnetic performance degradation caused by the irregular structure of the antenna casing, ultimately achieving a satisfactory irregular cavity antenna design.

[0060] It should be noted that, generally, a completely sealed metal cavity can generate electromagnetic oscillations inside through appropriate external excitation, forming a resonant cavity. The electromagnetic waves under resonance possess corresponding electric field modes and resonant frequencies. When one or both sides of the sealed metal resonant cavity are connected to the outside, the sinusoidal electromagnetic waves in the resonant state inside the cavity continuously radiate outwards, forming a radiation field. This open portion of the cavity is called a resonant cavity antenna, and its specific resonant frequency formula is:

[0061]

[0062] In the formula, a, b, and l are the lengths of the three sides of the cavity, while m, n, and p are the number of electric field modes on the corresponding sides. The important factor that enables this type of resonant cavity antenna to generate resonance and radiation is that the bottom metal surface, the top metal surface, and the metal sidewalls connected around them construct a metal cavity structure, which satisfies the structural form required for the operation of the resonant cavity.

[0063] Generally, cavity antennas are rectangular parallelepipeds. In the formula above, a, b, and l are the length, width, and height of the rectangular parallelepiped cavity. This requires that a relatively regular three-dimensional space be reserved inside the terminal product for the installation of the cavity antenna. However, in reality, due to the structural form of the terminal product and the stacking of different components inside the product, it is difficult to reserve a regular three-dimensional space, which greatly limits the application of cavity antennas in terminal products.

[0064] This invention incorporates an irregular cavity antenna structure designed for environmental adaptability of terminal products. Taking a dual-band WiFi (2.4GHz & 5.8GHz) antenna as an example, when the irregular cavity structure makes it difficult to simultaneously generate resonance at 2.4GHz and 5.8GHz, and impedance matching is poor, this invention modifies the cavity feed area structure and rationally designs the feed stub length, enabling the feed stub to not only excite the cavity mode but also the feed stub mode. That is, the cavity antenna of this invention can generate resonance at either 2.4GHz or 5.8GHz. Thus, the feed stub mode combined with the cavity mode can achieve dual-band WiFi coverage.

[0065] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0066] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0067] Reference Figures 1-18 This application provides a cavity antenna, comprising: a metal housing 100 having a cavity 110 and a first opening 120 connected to each other; the cavity 110 having a first cavity wall 111 and a second cavity wall 112 opposite to each other, the height of the first cavity wall 111 being greater than the height of the second cavity wall 112; a first dielectric substrate 200 covering the first opening 120; and a radiating stub 300 disposed on the first dielectric substrate 200, the radiating stub 300 being electrically connected to a feed point to excite the cavity 110 to resonate and radiate electromagnetic waves, for example, the radiating stub 300 being in the form of a monopole, a dipole, or an IFA.

[0068] In this way, by integrating the cavity antenna into the terminal device design, and designing the structural shape of the cavity antenna according to the shape of the space environment inside the terminal device where the antenna can be installed, the limitation of the regular shape of the cavity antenna is broken. Specifically, the metal shell 100 of the antenna has two opposing cavity walls of unequal height, so that the cavity antenna presents an unequal height structure after being set inside the terminal device. In other words, the cavity antenna is designed to fit the environment, effectively improving its structural application limitations in terminal products. Moreover, by designing the height of the first side 130 of the metal shell 100 to be greater than or equal to 5 mm, both the feed stub mode and the cavity mode can be excited simultaneously. On the one hand, it can ensure that the electromagnetic waves in the cavity 110 can form a stable resonant mode within this size range, thereby effectively exciting the cavity mode. On the other hand, the cavity 110 of the metal shell 100 can provide sufficient space and path so that the electromagnetic waves introduced by the feed point can effectively propagate and resonate in the antenna structure, exciting the feed stub mode, thereby eliminating the electromagnetic performance degradation caused by the irregular structure of the antenna shell, and ultimately achieving a non-regular cavity antenna design that meets the requirements.

[0069] Among them, the radiating stub 300 is the feeding stub. It should be noted that (1) when the feeding stub generates a low-frequency mode (2.4GHz) and the cavity 110 of the metal housing 100 generates a high-frequency mode (5.8GHz), the feeding stub can be a monopole, dipole, or inverted-FAntenna (IFA). The feeding stub is preferably in the form of IFA, so as to be easier to excite and match; (2) when the feeding stub generates a high-frequency mode (5.8GHz) and the cavity 110 generates a high-frequency mode (5.8GHz), the feeding stub can be in the form of a monopole, dipole, or inverted-FAntenna (IFA). The body 110 generates a low-frequency mode (2.4GHz), and the form of the feed stub can be a monopole, dipole, or IFA; (3) Since the cavity 110 has an irregular structure, the cavity 110 can generate dual-frequency modes, but the high-frequency bandwidth and matching cannot meet the requirements. Therefore, by reasonably designing the feed structure, it can also generate stub modes at high frequencies. Through the superposition effect of the stub mode and the cavity mode, the design requirements for bandwidth and matching at 5.8G are met. At this time, the height of the plane where the feed stub is located is greater than or equal to 5 mm.

[0070] In some embodiments, along the height direction of the metal housing 100, the metal housing 100 has opposing first surfaces 140 and second surfaces 150, the plane containing the first surface 140 intersects the plane containing the second surface 150, such as... Figure 13 , Figure 14 As shown, the second surface 150 is the lower surface of the metal housing 100, which can provide a pre-installation space that matches the structural features of the terminal with the housing.

[0071] In some embodiments, the metal housing 100 has a first side 130 near the first cavity wall 111, and the height of the first side 130 is greater than or equal to 5 mm. Empirically, if the height of the first side 130 of the metal housing 100 is less than 5 mm, the inductance-capacitance effect of the antenna is large, and it is not easy to simultaneously excite the feed stub and cavity dual modes.

[0072] For example, the first surface 140 is tilted, and / or the second surface 150 is tilted.

[0073] A first opening 120 is formed on the first surface 140, and a first side 130 of the metal housing 100 is located between the first surface 140 and the second surface 150, with the first side 130 located on the side closer to the first opening 120.

[0074] In some embodiments, the metal housing 100 includes a first metal housing 101 and a second metal housing 102. The first metal housing 101 is connected to the second metal housing 102, and the inner cavity of the first metal housing 101 communicates with the inner cavity of the second metal housing 102. One side of the inner cavity of the first metal housing 101 is a second cavity wall 112; one side of the inner cavity of the second metal housing 102 is a first cavity wall 111. The second metal housing 102 has a first opening 120 and a first side surface 130. Figures 1 to 4 As shown, the pre-installation space can meet the requirements of the terminal and the structural features of the housing.

[0075] In some embodiments, the first metal housing 101 has opposing third surfaces 1011 and fourth surfaces 1012, the plane containing the third surface 1011 and the plane containing the fourth surface 1012 intersecting, such as... Figures 1 to 4 As shown, the pre-installation space can meet the requirements of the terminal and the structural features of the housing.

[0076] In some embodiments, the second metal housing 102 further has a second side 1021 opposite to the first side 130, the first side 130 being connected to the fourth surface 1012, and the second side 1021 being connected to the third surface 1011; the distance from the end of the second side 1021 connected to the third surface 1011 to the fourth surface 1012 is greater than or equal to 1 mm, preferably, the distance from the end of the second side 1021 connected to the third surface 1011 to the fourth surface 1012 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0077] For example, the distance from the end of the second side 1021 connected to the third surface 1011 to the fourth surface 1012 is equal to 1 mm. The first metal housing 101 has a third side 1015 opposite to the first side 130. The third side 1015 is connected between the third surface 1011 and the fourth surface 1012. The height of the third side 1015 is 4-5 mm.

[0078] In some embodiments, the first metal housing 101 has opposing third surfaces 1011 and fourth surfaces 1012, the plane containing the third surface 1011 and the plane containing the fourth surface 1012 being parallel, such as... Figure 17 As shown, the pre-installation space can meet the requirements of the terminal and the structural features of the housing.

[0079] In some embodiments, the first dielectric substrate 200 includes a first sub-board 210 and a second sub-board 220 connected together. A second opening 131 is provided on a first side 130. The first sub-board 210 covers the first opening 120, and the second sub-board 220 covers the second opening 131. Radiation branches 300 are provided on the second sub-board 220, for example, the radiation branches 300 are in the form of IFA (Integrated Fiber Aperture). Figure 10 , Figure 11 ).

[0080] In some embodiments, combined with Figure 12 The length of the second metal housing 102 is less than that of the first metal housing 101, which reduces the size of the antenna, further improves its installation flexibility inside the terminal, and saves materials.

[0081] In some embodiments, the fourth surface 1012 is provided with a third opening 1013, and the fourth surface 1012 is also provided with a metal connector 1014 located on the side of the third opening 1013 for grounding. With this configuration, the metal connector 1014 at the bottom of the first metal housing 101 is connected to the metal housing of the terminal device to form a metal resonant cavity structure, which can save the material of the metal housing 100. Furthermore, the distance between two adjacent metal connectors 1014 is less than or equal to λ / 8, where λ is the wavelength corresponding to the center frequency of the resonant frequency of the cavity 110, which can ensure that the cavity 110 resonates in the 5.8GHz frequency band.

[0082] In some embodiments, when the length of the radiating stub 300 is less than λ / 8, the resonant frequency of the cavity 110 is 2.4 GHz; when the length of the radiating stub 300 is less than λ / 4, the resonant frequency of the cavity 110 is 5.8 GHz, where λ is the wavelength corresponding to the center frequency of the resonant frequency of the cavity 110, which can ensure efficient excitation of dual modes.

[0083] It should be noted that the cavity antenna structural design scheme of the above embodiments is also applicable to the combination of GPS and dual-band WiFi, the combination of GPS and single-band WiFi, and single-band WiFi 5.8G and other frequency bands.

[0084] Combination Figure 7 The diagram shows the return loss curve of the cavity antenna provided in the embodiment of this application. It is easy to see that the cavity antenna forms a dual-frequency resonance.

[0085] It should be noted that the vertical axis of the antenna simulation return loss curve usually represents return loss, which is typically measured in decibels (dB). Return loss reflects the antenna's reflection performance at a specific frequency; a lower value indicates better antenna matching performance and less reflected energy.

[0086] Further integration Figure 8 and Figure 9 As can be seen from the internal electric field distribution diagrams of the cavity antenna in this embodiment at 2.5 GHz and 5.69 GHz, the electric field at 2.5 GHz is distributed throughout the cavity 110 of the entire metal housing 100, which is the cavity mode. At 5.69 GHz, there is almost no electric field distribution inside the cavity 110, which is mainly generated by the monopole of the radiating stub 300. Therefore, the cavity mode and the feeding stub mode together generate dual-frequency resonance.

[0087] The embodiments of this application have at least the following beneficial effects:

[0088] By designing the metal shell and radiating stub structure of the cavity antenna, the feed stub mode and cavity mode are effectively excited, thereby achieving the multi-band coverage requirements of the antenna. The excitation of the feed stub mode allows the cavity antenna to achieve target bandwidth coverage even with an irregular structure, ultimately realizing the integrated design of the cavity antenna and the terminal structure, eliminating the need for a complete standard space for designing the cavity antenna.

[0089] Secondly, embodiments of this application provide an electronic device, which includes a device body and a cavity antenna as provided in any embodiment of the first aspect, wherein the device body may be a laptop computer, tablet computer, mobile phone, smart bracelet, smart home appliance or smartwatch.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0092] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cavity antenna, characterized in that, include: A metal housing having a communicating cavity and a first opening, the cavity having opposing first and second cavity walls, the height of the first cavity wall being greater than the height of the second cavity wall; A first dielectric substrate, the first dielectric substrate being disposed over the first opening; A radiating stub is disposed on the first dielectric substrate. The radiating stub is electrically connected to the feed point to excite the cavity to resonate and radiate electromagnetic waves.

2. The cavity antenna according to claim 1, characterized in that, Along the height direction of the metal casing, the metal casing has a first surface and a second surface opposite each other, and the plane containing the first surface and the plane containing the second surface intersect each other.

3. The cavity antenna according to claim 1, characterized in that, The metal housing has a first side surface near the first cavity wall, and the height of the first side surface is greater than or equal to 5 mm.

4. The cavity antenna according to claim 3, characterized in that, The metal housing includes a first metal housing and a second metal housing. The first metal housing is connected to the second metal housing, and the inner cavity of the first metal housing is connected to the inner cavity of the second metal housing. One side of the inner cavity of the first metal housing is the second cavity wall. The inner cavity of the second metal housing is one side of the first cavity wall, the first opening is formed on the second metal housing, and the second metal housing has the first side surface.

5. The cavity antenna according to claim 4, characterized in that, The first metal casing has a third surface and a fourth surface that are opposite each other, and the plane containing the third surface and the plane containing the fourth surface intersect each other.

6. The cavity antenna according to claim 5, characterized in that, The second metal housing also has a second side opposite to the first side, the first side being connected to the fourth surface, and the second side being connected to the third surface; The distance from the end of the second side surface connected to the third surface to the fourth surface is greater than or equal to 1 mm.

7. The cavity antenna according to claim 4, characterized in that, The first metal casing has a third surface and a fourth surface opposite each other, and the plane containing the third surface and the plane containing the fourth surface are parallel.

8. The cavity antenna according to any one of claims 4-7, characterized in that, The first dielectric substrate includes a first sub-board and a second sub-board connected together. The first side has a second opening. The first sub-board covers the first opening, and the second sub-board covers the second opening. The second sub-board has the radiation branches.

9. The cavity antenna according to any one of claims 5-7, characterized in that, The fourth surface is provided with a third opening, and the fourth surface is also provided with a metal connector located on the side of the third opening for grounding.

10. The cavity antenna according to any one of claims 1-7, characterized in that, When the length of the radiating stub is less than λ / 8, the resonant frequency of the cavity is 2.4 GHz; when the length of the radiating stub is less than λ / 4, the resonant frequency of the cavity is 5.8 GHz, where λ is the wavelength corresponding to the center frequency of the resonant frequency of the cavity.

11. An electronic device, characterized in that, Includes the cavity antenna according to any one of claims 1-10.

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