Wall-mounted antenna
The wall-mounted antenna design addresses the challenge of wide bandwidth and size by using a shielded cavity structure with symmetrical dual-antenna elements and a coupling balun, achieving efficient dual-frequency operation and reduced cost.
Patent Information
- Application Number
- CN202422168873.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-03
AI Technical Summary
Existing wall-mounted antennas face challenges in achieving wide bandwidth while minimizing size and cost, particularly in supporting multiple frequency bands from low frequencies like 700 MHz to high frequencies like 5G, due to the need for multiple radiation units which increases the antenna's size and cost.
A wall-mounted antenna design incorporating a shielded cavity structure with symmetrical dual-antenna elements and a coupling balun for feeding, utilizing an odd-mode excitation mechanism to reduce size and enhance performance across both low and high frequencies.
The design achieves reduced profile size and cost-effective dual-frequency operation from 880-960 MHz to 1710-2700 MHz by optimizing impedance matching and reducing radiation losses, while maintaining high efficiency and compactness.
Smart Images
Figure CN223066468U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present utility model relate to the field of wireless communication technologies, and in particular to a wall-mounted antenna. Background Art
[0002] The demand for mobile communication frequency bands is getting wider and wider, from the low-frequency 700 MHz to the high-frequency 3G, and the original 2G frequency band is deeply cultivated to the 5G frequency band. From the wide-area coverage of 4G to the hotspot layout of 5G, antennas are required to meet the broadband characteristics. Enabling antennas to support large-bandwidth operation can effectively reduce the variety of products, lower product costs, and improve the market competitiveness. With the improvement of people's living quality, higher requirements are put forward for indoor antennas in terms of indicators such as size, shape, and bandwidth. How to increase the antenna bandwidth, reduce the antenna size, and make the shape harmonious and beautiful with the environment is the development trend of indoor antennas.
[0003] Restricted by antenna technology limitations and large-bandwidth technical requirements, antennas use radiation units of different frequency bands, and the low-frequency and high-frequency are combined through a combining device to achieve a common channel. The antennas set up in this way are actually a combination of multiple antennas together, and the antenna size will be relatively large, and the product cost will be relatively high. Summary of the Invention
[0004] In view of the above-mentioned defects of the prior art, the embodiments of the present utility model provide a wall-mounted antenna, which can reduce the antenna profile size while meeting the dual-frequency operation requirements of 880 - 960 MHz and high-frequency 1710 - 2700 MHz.
[0005] To solve the above technical problems, a technical solution adopted by the embodiments of the present utility model is: to provide a wall-mounted antenna, the wall-mounted antenna includes a bottom plate, a first radiation unit, a second radiation unit, a coupling balun, and a coaxial cable; two opposite side surfaces of the bottom plate are bent to form a first side wall and a second side wall, forming a shielding cavity with the bottom plate;
[0006] Both the first radiation unit and the second radiation unit are dipole units and are symmetrically arranged in the shielding cavity. The coupling balun is installed between the first radiation unit and the second radiation unit through an insulating member. The outer conductor of the coaxial cable is connected to the first radiation unit, and the inner conductor of the coaxial cable is connected to the coupling balun to feed the first radiation unit and the second radiation unit.
[0007] Optionally, the first radiation unit includes a first radiation sheet and a second radiation sheet, and the second radiation unit includes a third radiation sheet and a fourth radiation sheet;
[0008] The first radiation patch and the second radiation patch are connected to each other and perpendicular. The third radiation patch and the fourth radiation patch are connected to each other and perpendicular. The first radiation patch and the third radiation patch are mounted on the bottom plate and perpendicular to the bottom plate. The second radiation patch is perpendicular to the first side wall, and the fourth radiation patch is perpendicular to the second side wall. The outer conductor of the coaxial line is connected to the lower part of the first radiation patch.
[0009] Optionally, a first accommodating space is formed between the first radiation patch and the third radiation patch. The coupling balun is mounted in the first accommodating space, and the first accommodating space is located at the center of the bottom plate.
[0010] Optionally, the coupling balun includes a first coupling patch and a second coupling patch. The first coupling patch and the second coupling patch are connected to each other and perpendicular. The first coupling patch is arranged parallel to the first radiation patch, and the second coupling patch is arranged perpendicular to the third radiation patch. The inner conductor of the coaxial line is connected to the lower part of the first coupling patch.
[0011] Optionally, a first support piece and a second support piece are respectively mounted on the bottom surfaces of the first radiation patch and the third radiation patch. The first support piece is perpendicular to the first radiation patch and mounted on the bottom plate. The second support piece is perpendicular to the third radiation patch and mounted on the bottom plate. The first support piece and the second support piece form an air microstrip balun with the coupling balun.
[0012] Optionally, the wall-mounted antenna further includes an upper cover. The upper cover has a second accommodating space, and a first director and a second director are mounted in the second accommodating space. The upper cover covers the bottom plate and wraps the shielding cavity. The first director and the second director are located above the first radiation unit and the second radiation unit.
[0013] Optionally, the first director is circular and located in the middle of the second accommodating space. The second director is rectangular and located in the middle of the first director.
[0014] Optionally, a resonant unit is mounted in the shielding cavity. The resonant unit has a first tuning piece, a second tuning piece and a third tuning piece. The first tuning piece and the third tuning piece are connected by the second tuning piece. The first tuning piece and the third tuning piece are parallel to each other and perpendicular to the second tuning piece. The third tuning piece is mounted on the bottom plate.
[0015] Optionally, an opening is formed on the first side wall. The opening communicates with the shielding cavity. A wire fixing clip is installed in the opening. The coaxial cable is installed on the wire fixing clip and passes through the opening to be connected to the first radiation unit and the coupling balun.
[0016] Optionally, a hanging plate is installed on the side surface of the bottom plate outside the shielding cavity. The wall-mounted antenna is installed on the wall through the hanging plate.
[0017] An embodiment of the present invention provides a wall-mounted antenna, which includes a bottom plate, a first radiation unit, a second radiation unit, a coupling balun, and a coaxial cable. Two opposite side surfaces of the bottom plate are bent to form a first side wall and a second side wall, which form a shielding cavity with the bottom plate. Both the first radiation unit and the second radiation unit are dipole units and are symmetrically arranged in the shielding cavity. The coupling balun is installed between the first radiation unit and the second radiation unit through an insulating member. The outer conductor of the coaxial cable is connected to the first radiation unit, and the inner conductor of the coaxial cable is connected to the coupling balun to feed the first radiation unit and the second radiation unit. On the one hand, the first radiation unit and the second radiation unit adopt dipole units and are arranged in the shielding cavity. Since the dipole antenna has a longer length at low frequencies, it can better radiate low-frequency electromagnetic waves. And adopting a symmetric structure can effectively reduce the radiation impedance in the monopole structure, improve the efficiency of the antenna, and enable the antenna to have better performance at low frequencies. On the other hand, using a coupling balun for feeding can enable the antenna to have better performance at high frequencies, making the antenna have better matching performance at high frequencies. At the same time, the coupling balun feeding can also reduce the volume of the antenna, making the structure of the antenna more compact. Description of the Drawings
[0018] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0019] Figure 1 Shows the structural diagram of the wall-mounted antenna in an embodiment of the present invention;
[0020] Figure 2 Shows the exploded view of the wall-mounted antenna in an embodiment of the present invention;
[0021] Figure 3 Shows the bottom view of the upper cover in an embodiment of the present invention.
[0022] 1. Bottom plate; 2. Upper cover; 3. Second radiation unit; 4. First radiation unit; 5. Coupling balun; 6. Resonant unit; 7. Coaxial cable; 8. Second director; 9. First director; 10. Cable clamp; 11. Hanging plate; 101. First side wall; 102. Second side wall; 301. Third radiation piece; 302. Fourth radiation piece; 303. First support piece; 401. Second radiation piece; 402. First radiation piece; 403. Second support piece; 501. Second coupling piece; 502. First coupling piece; 601. First tuning piece; 602. Second tuning piece; 603. Third tuning piece. Detailed implementation manners
[0023] The embodiments of the technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, and therefore are only examples and cannot be used to limit the protection scope of the present utility model.
[0024] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should be of the ordinary meaning understood by those skilled in the art to which the present utility model belongs.
[0025] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.
[0026] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.
[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0028] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.
[0029] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. shows the structural diagram of the wall-mounted antenna in the embodiment of the present invention, and FIG. shows the exploded view of the wall-mounted antenna in the embodiment of the present invention. The wall-mounted antenna includes a bottom plate 1, a first radiation unit 4, a second radiation unit 3, a coupling balun 5, and a coaxial cable 7; two opposite side surfaces of the bottom plate 1 are bent to form a first side wall 101 and a second side wall 102, forming a shielding cavity with the bottom plate 1;
[0030] Both the first radiation unit 4 and the second radiation unit 3 are dipole units and are symmetrically arranged in the shielding cavity. The coupling balun 5 is installed between the first radiation unit 4 and the second radiation unit 3 through an insulating member. The outer conductor of the coaxial cable 7 is connected to the first radiation unit 4, and the inner conductor of the coaxial cable 7 is connected to the coupling balun 5 to feed the first radiation unit 4 and the second radiation unit 3.
[0031] Among them, the bottom plate 1 is made of metal, and the shielding cavity can also be formed by bending the side surfaces around the bottom plate 1. The shielding cavity is used to shield external interference and optimize the radiation characteristics, improving the antenna lobe width and front-to-back ratio. Its specific shape and structure can be set according to actual usage requirements. In this embodiment, two opposite side surfaces of the bottom plate 1 are bent to form a first side wall 101 and a second side wall 102, which form a shielding cavity with the bottom plate 1. On the one hand, the first radiation unit 4 and the second radiation unit 3 adopt dipole units and are arranged in the shielding cavity. Since the dipole antenna has a longer length at low frequencies and can better radiate low-frequency electromagnetic waves, using a symmetric structure can effectively reduce the radiation impedance in the monopole structure, improve the efficiency of the antenna, and enable the antenna to have better performance at low frequencies. On the other hand, using a coupled balun 5 for feeding can enable the antenna to have better performance at high frequencies. The coupled balun 5 for feeding can reduce the input impedance of the antenna, making the antenna have better matching performance at high frequencies. At the same time, the coupled balun 5 for feeding can also reduce the volume of the antenna, making the structure of the antenna more compact. This enables the antenna in the embodiment of the present invention to achieve an integrated low-frequency and high-frequency structure, and the first radiation unit 4 and the second radiation unit 3 adopt a dipole low-balun structure, reducing the profile size of the wall-mounted antenna and shrinking the volume of the wall-mounted antenna. It can achieve reducing the antenna profile size while meeting the dual-frequency operation requirements of 880 - 960 MHz for low frequency and 1710 - 2700 MHz for high frequency.
[0032] Among them, the first radiation unit 4 and the second radiation unit 3 adopt a dipole low-balun structure and are symmetrically arranged in the shielding cavity to ensure the symmetry of the antenna and the uniformity of the radiation pattern, so as to help optimize the directivity and gain of the antenna. Among them, the dipole low-balun structure is composed of two conductors with equal lengths, and is connected to a cable or coaxial line 7 through a feeding point. The shape, size, and installation position of the first radiation unit 4 and the second radiation unit 3 can be set according to actual usage conditions. In one implementation, the first radiation unit 4 includes a first radiation piece 402 and a second radiation piece 401, and the second radiation unit 3 includes a third radiation piece 301 and a fourth radiation piece 302; the first radiation piece 402 and the second radiation piece 401 are connected to each other and perpendicular, the third radiation piece 301 and the fourth radiation piece 302 are connected to each other and perpendicular, the first radiation piece 402 and the third radiation piece 301 are installed on the bottom plate 1 and are perpendicular to the bottom plate 1; the second radiation piece 401 is perpendicular to the first side wall 101, the fourth radiation piece 302 is perpendicular to the second side wall 102, and the outer conductor of the coaxial line 7 is connected to the lower part of the first radiation piece 402. Among them, the first radiation piece 402 and the second radiation piece 401 are perpendicularly arranged, and the third radiation piece 301 and the fourth radiation piece 302 are perpendicularly arranged to form a folded dipole, so as to reduce the profile size and help optimize the gain and bandwidth of the antenna.
[0033] Among them, for low-frequency signals, the height of the first radiation patch 402 can be set to λ / 8 (λ is the wavelength of the low frequency). For high-frequency signals, the height of the first radiation patch 402 can be set to λ / 4 (λ is the wavelength of the high frequency) to achieve a low-profile size and better convergence of the high-frequency and low-frequency radiation patterns. Among them, the angles between the first radiation patch 402, the second radiation patch 401, the third radiation patch 301, and the fourth radiation patch 302, as well as the angles with the bottom plate 1, can be adjusted according to actual usage. In another implementation, a first accommodation space is formed between the first radiation patch 402 and the third radiation patch 301, and the coupling balun 5 is installed in the first accommodation space, and the first accommodation space is located at the center of the bottom plate 1. The fact that the first accommodation space is located at the center of the bottom plate 1 can be understood as that the first radiation unit 4 and the second radiation unit 3 are symmetrically installed at the center of the bottom plate 1, which can improve the radiation symmetry, directivity, and gain of the antenna, reduce interference, optimize impedance matching, and enhance overall stability. Moreover, the coupling balun 5 is installed in the first accommodation space and feeds the center of the antenna, which helps to achieve a uniform electromagnetic field distribution and ensure the symmetry and optimized performance of the antenna. Among them, the coupling balun 5 is used to feed the first radiation unit 4 and the second radiation unit 3 and enable the antenna to have better matching performance at high frequencies, and its shape, installation position, and size can be adjusted according to the parameters of the first radiation unit 4 and the second radiation unit 3 and actual usage requirements.
[0034] As Figure 2 shown, in one implementation, the coupling balun 5 includes a first coupling piece 502 and a second coupling piece 501. The first coupling piece 502 and the second coupling piece 501 are connected to each other and perpendicular. The first coupling piece 502 is arranged parallel to the first radiation patch 402, the second coupling piece 501 is arranged perpendicular to the third radiation patch 301, and the inner conductor of the coaxial line 7 is connected to the lower part of the first coupling piece 502.
[0035] Among them, both the first coupling piece 502 and the second coupling piece 501 are rectangular. In this embodiment, in order to match the bandwidth, stepped slots are opened on both sides of the second coupling piece 501, so that the upper surface of the second coupling piece 501 gradually increases in the direction from the first radiating piece 402 to the second radiating piece 401. The first coupling piece 502 is installed at one end of the second coupling piece 501, and three first connection holes are arranged at equal intervals on the surface. Among them, three second connection holes are correspondingly arranged on the first radiating piece 402 and the third radiating piece 301. Among them, the first connection holes and the second connection holes are both arranged vertically. The first coupling piece 502 is fixed to the first radiating piece 402 by installing two insulating parts in the upper two first connection holes and second connection holes. Among them, the insulating part can be a bolt made of plastic material; the coaxial line 7 passes through the remaining first connection holes and second connection holes on the first coupling piece 502 and the first radiating piece 402, the outer conductor is fixed to the second connection hole, and the inner conductor is fixed to the first connection hole. The other end of the second coupling piece 501 is also connected to the third radiating piece 301 through an insulating part.
[0036] Among them, in an embodiment of the present utility model, a first support piece 303 and a second support piece 403 are respectively installed on the bottom surfaces of the first radiating piece 402 and the third radiating piece 301; the first support piece 303 is perpendicular to the first radiating piece 402 and is installed on the bottom plate 1, the second support piece 403 is perpendicular to the third radiating piece 301 and is installed on the bottom plate 1, and the first support piece 303 and the second support piece 403 form an air microstrip balun with the coupling balun 5.
[0037] Among them, the shapes and sizes of the first support piece 303 and the second support piece 403 can be adjusted according to the actual needs of the antenna. In this embodiment, both the first support piece 303 and the second support piece 403 are rectangular. Two first support pieces 303 are symmetrically installed on both sides of the bottom surface of the first radiating piece 402, and two second support pieces 403 are symmetrically installed on both sides of the bottom surface of the third radiating piece 301, so that the first support piece 303 and the second support piece 403 form an air microstrip balun with the coupling balun 5 to reduce signal loss, improve bandwidth, and increase antenna performance.
[0038] Among them, in an embodiment of the present utility model, the wall-mounted antenna further includes an upper cover 2, the upper cover 2 has a second accommodation space, and a first director 9 and a second director 8 are installed in the second accommodation space; the upper cover 2 is covered on the bottom plate 1 to wrap the shielding cavity; the first director 9 and the second director 8 are located above the first radiation unit 4 and the second radiation unit 3.
[0039] Among them, the upper cover 2 is installed on the bottom plate 1 and covers the shielding cavity, which can help improve the overall radiation performance of the antenna and protect the internal components; the first director 9 and the second director 8 are used to adjust the radiation parameters of the antenna and improve the impedance bandwidth. The shapes, sizes and installation positions of the first director 9 and the second director 8 can be adjusted according to actual needs. In one implementation, the first director 9 is annular and located in the middle of the second accommodation space, the second director 8 is rectangular, and the second director 8 is located in the middle of the first director 9. Among them, the annular first director 9 is installed in the middle of the second accommodation space and is connected to the inner wall of the upper cover 2 through an insulator. Among them, the annular first director 9 helps to improve the omnidirectional radiation performance of the antenna, and the rectangular second director 8 can improve the directional performance of the antenna and concentrate the radiation signal to a predetermined direction. And by placing the second director 8 at the center of the first director 9, the overall gain of the antenna can be increased and the directivity of the signal can be effectively controlled. In another implementation, the first director 9 and the second director 8 can be rectangular and symmetrically installed in the second accommodation space. Among them, the symmetrical arrangement of the rectangular first director 9 and the second director 8 helps to optimize the distribution of the electromagnetic field inside the antenna, avoid unnecessary interference and signal loss, and can simplify the design and manufacturing process of the antenna.
[0040] Among them, in an embodiment of the present invention, a resonant unit 6 is installed in the shielding cavity. The height of the resonant unit 6 can be λ / 4 (λ is the wavelength of the low frequency), which is used to improve the low-frequency impedance, broaden the bandwidth, and achieve a good matching purpose. The resonant unit 6 can include multiple sheets, and the installation relationship, size and shape between the multiple sheets can be adjusted according to actual usage requirements. In one implementation, the resonant unit 6 has a first tuning sheet 601, a second tuning sheet 602 and a third tuning sheet 603; the first tuning sheet 601 and the third tuning sheet 603 are connected by the second tuning sheet 602, the first tuning sheet 601 and the third tuning sheet 603 are parallel to each other and perpendicular to the second tuning sheet 602, and the third tuning sheet 603 is installed on the bottom plate 1.
[0041] Among them, in an embodiment of the present invention, an opening is provided on the first side wall 101, the opening communicates with the shielding cavity, a wire clamp 10 is installed in the opening, and the coaxial cable 7 is installed on the wire clamp 10 and passes through the opening to be connected to the first radiation unit 4 and the coupling balun 5. The wire clamp 10 is used to fix the coaxial cable 7 to stabilize signal transmission.
[0042] Wherein, in an embodiment of the present utility model, a hanging plate 11 is installed on the side surface of the bottom plate 1 located outside the shielding cavity, and the wall-mounted antenna is installed on the wall through the hanging plate 11, which can facilitate the installation operation and improve the construction speed.
[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements 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 utility model, and they should all be covered by the scope of the claims and the description of the present utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.
Claims
1. A wall-mounted antenna, characterized in that, The wall-mounted antenna includes a bottom plate (1), a first radiation unit (4), a second radiation unit (3), a coupling balun (5), and a coaxial cable (7); two opposite side surfaces of the bottom plate (1) are bent to form a first side wall (101) and a second side wall (102), forming a shielding cavity with the bottom plate (1). The first radiation unit (4) and the second radiation unit (3) are both dipole units and are symmetrically arranged in the shielding cavity. The coupling balun (5) is installed between the first radiation unit (4) and the second radiation unit (3) through an insulating member. The outer conductor of the coaxial cable (7) is connected to the first radiation unit (4), and the inner conductor of the coaxial cable (7) is connected to the coupling balun (5) to feed the first radiation unit (4) and the second radiation unit (3).
2. The wall-mounted antenna according to claim 1, wherein The first radiation unit (4) includes a first radiation sheet (402) and a second radiation sheet (401), and the second radiation unit (3) includes a third radiation sheet (301) and a fourth radiation sheet (302). The first radiation sheet (402) and the second radiation sheet (401) are connected to each other and perpendicular. The third radiation sheet (301) and the fourth radiation sheet (302) are connected to each other and perpendicular. The first radiation sheet (402) and the third radiation sheet (301) are installed on the bottom plate (1) and are perpendicular to the bottom plate (1). The second radiation sheet (401) is perpendicular to the first side wall (101), and the fourth radiation sheet (302) is perpendicular to the second side wall (102). The outer conductor of the coaxial cable (7) is connected to the lower part of the first radiation sheet (402).
3. The wall-mounted antenna according to claim 2, wherein A first accommodation space is formed between the first radiation sheet (402) and the third radiation sheet (301). The coupling balun (5) is installed in the first accommodation space, and the first accommodation space is located at the center of the bottom plate (1).
4. The wall-mounted antenna according to claim 2, wherein The coupling balun (5) includes a first coupling sheet (502) and a second coupling sheet (501). The first coupling sheet (502) and the second coupling sheet (501) are connected to each other and perpendicular. The first coupling sheet (502) is arranged parallel to the first radiation sheet (402), and the second coupling sheet (501) is arranged perpendicular to the third radiation sheet (301). The inner conductor of the coaxial cable (7) is connected to the lower part of the first coupling sheet (502).
5. The wall-mounted antenna according to claim 2, characterized in that, First support sheets (303) and second support sheets (403) are respectively installed on the bottom surfaces of the first radiation sheet (402) and the third radiation sheet (301). The first support sheet (303) is perpendicular to the first radiation sheet (402) and is installed on the bottom plate (1). The second support sheet (403) is perpendicular to the third radiation sheet (301) and is installed on the bottom plate (1). The first support sheet (303) and the second support sheet (403) form an air microstrip balun with the coupling balun (5).
6. The wall-mounted antenna according to claim 1, characterized in that, The wall-mounted antenna further includes an upper cover (2), the upper cover (2) has a second accommodation space, and a first director (9) and a second director (8) are installed in the second accommodation space; the upper cover (2) is covered on the bottom plate (1) to wrap the shielding cavity; the first director (9) and the second director (8) are located above the first radiation unit (4) and the second radiation unit (3).
7. The wall-mounted antenna according to claim 6, characterized in that, The first director (9) is circular ring-shaped and located in the middle of the second accommodation space, the second director (8) is rectangular, and the second director (8) is located in the middle of the first director (9).
8. The wall-mounted antenna according to claim 2, wherein A resonant unit (6) is installed in the shielding cavity, and the resonant unit (6) has a first tuning piece (601), a second tuning piece (602) and a third tuning piece (603); the first tuning piece (601) and the third tuning piece (603) are connected by the second tuning piece (602), the first tuning piece (601) and the third tuning piece (603) are parallel to each other and perpendicular to the second tuning piece (602), and the third tuning piece (603) is installed on the bottom plate (1).
9. The wall-mounted antenna according to claim 1, characterized in that, An opening is formed on the first side wall (101), the opening is communicated with the shielding cavity, a wire clamp (10) is installed in the opening, and the coaxial cable (7) is installed on the wire clamp (10) and passes through the opening to be connected with the first radiation unit (4) and the coupling balun (5).
10. The wall-mounted antenna according to claim 1, characterized in that, A hanging plate (11) is installed on the side surface of the bottom plate (1) outside the shielding cavity, and the wall-mounted antenna is installed on the wall through the hanging plate (11).