A beidou high-precision anti-interference array antenna capable of mutual coupling cancellation

Abstract

The utility model belongs to antenna technical field, more specifically is related to a kind of Beidou high-precision anti-interference array antenna capable of mutual coupling elimination, including square antenna metal cavity base, center double-frequency laminated antenna and four B3 frequency band anti-interference unit antennas etc.The utility model passes through five independent antenna array element combination (one center double-frequency laminated antenna and four B3 frequency band anti-interference unit antennas) Beidou multi-frequency band array antenna, B1 / B3 frequency band of Beidou can be covered, that is, satisfy the high-precision positioning demand of Beidou navigation equipment B1 / B3 frequency band, while cooperating rear-end system link realizes B3 frequency band anti-suppression interference demand, and the on-off of radio frequency switch diode is selected to the metal radiation patch of antenna array element, realizes antenna resonance coupling frequency flexible switching, in high-precision positioning scene, the resonance coupling frequency of anti-interference array element is made frequency adjustment, and the coupling effect of anti-interference array element to center antenna array element is eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of antenna technology, and more specifically relates to a Beidou high-precision anti-interference array antenna capable of mutual coupling cancellation. Background Technology

[0002] Global Navigation Satellite Systems (GNSS) provide users worldwide with all-weather three-dimensional coordinates, velocity, and time information, with applications spanning both civilian and specialized fields. In the terminal equipment of this system, the antenna, as a core component of the satellite signal transceiver system, directly affects the overall operational efficiency of the terminal equipment. However, interference sources in the communication environment are complex and diverse, with deliberate suppression interference often causing significant harm, especially in specialized electronic countermeasures applications. This poses a severe challenge to the antenna's anti-interference capabilities. Although using arrayed antennas can effectively improve anti-interference capabilities, when operating in the same frequency band, they can generate a strong mutual coupling effect on nearby high-precision antennas. This mutual coupling effect leads to a decrease in the gain and deterioration of the phase center stability of high-precision antennas, thereby causing a degradation in positioning accuracy. Utility Model Content

[0003] The purpose of this invention is to overcome the problems existing in the array combination antennas in the background art. This invention provides a Beidou high-precision anti-interference array antenna that can eliminate mutual coupling, that is, under the premise of meeting the anti-interference requirements of Beidou navigation equipment, it eliminates the mutual coupling effect between antennas and improves the positioning accuracy of navigation equipment.

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution: This utility model proposes a Beidou high-precision anti-interference array antenna capable of mutual coupling cancellation, including a square antenna metal cavity base, a central dual-frequency stacked antenna, and four B3 band anti-interference unit antennas. The central dual-frequency stacked antenna is disposed on (usually mounted to) the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The central dual-frequency stacked antenna includes a first dielectric substrate, a lower inner radiating patch, a second dielectric substrate, and an upper radiating patch; The first dielectric substrate is disposed on the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The second dielectric plate is disposed on the radiating surface of the first dielectric plate, wherein the axis is coaxial with the central axis of the first dielectric plate; The lower inner radiation patch is disposed between the first dielectric substrate and the second dielectric substrate; The upper radiation patch is disposed on the top surface of the second dielectric plate; The four B3 band anti-interference unit antennas are respectively located at the four corners of the radiating surface of the square antenna metal cavity base; The B3 band anti-interference unit antenna includes a third dielectric substrate and an anti-interference internal radiation patch. The third dielectric substrate is disposed on the radiating surface of the square antenna metal cavity base; The anti-interference internal radiation patch is provided on the top surface of the third dielectric plate; The radiating surface of the square antenna metal cavity base is provided with a feed network (the feed network board contains radio frequency micro-strip lines, 3dB couplers, isolation resistors, matching separation components and other devices to realize the circular polarization characteristics of the antenna element). This includes toothed metal ferrules; The toothed metal ring is disposed on the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The central dual-frequency stacked antenna is located inside the toothed metal ring, with its axis coaxial with the central axis of the toothed metal ring. The central dual-frequency stacked antenna also includes a lower outer radiating patch and a first radio frequency switching diode; The lower outer radiating patch is disposed on the top surface of the first dielectric substrate and is located around the lower inner radiating patch; The lower outer radiating patch and the upper radiating patch are connected by the first radio frequency switching diode; The B3 band anti-interference unit antenna also includes an anti-interference external radiating patch and a second radio frequency switching diode. The anti-interference external radiation patch is disposed on the top surface of the third dielectric plate, located around the anti-interference internal radiation patch; The anti-interference external radiation patch and the anti-interference internal radiation patch are connected by the second radio frequency switch diode; Both the first and second RF switching diodes are soldered.

[0005] As a preferred technical solution of this utility model, the lower outer radiation patch is in the shape of a ring, and four raised rectangular shapes are provided at equal intervals along the circumference of the inner side of the ring shape. The lower inner radiating patch is rectangular in shape, with rounded corners at the four corners, and the centers of the four sides of the rectangle protrude in a rectangular shape towards the lower outer radiating patch. The raised rectangular shape of the lower outer radiating patch and the raised rectangular shape of the lower inner radiating patch are connected by the first radio frequency switching diode.

[0006] As a preferred embodiment of this utility model, the anti-interference external radiation patch is in the shape of a rectangular ring, and the center of the four sides of the rectangular ring is connected to the center of the four sides of the anti-interference internal radiation patch through the second radio frequency switch diode.

[0007] As a preferred embodiment of this utility model, the opening and closing of the first RF switching diode and the second RF switching diode are controlled by an external signal (IO level control, such as the MCU giving a high or low level to control the diode's on / off state).

[0008] As a preferred embodiment of this utility model, the top surface of the toothed metal ring is flush with the top surface of the upper radiating patch. The top of the toothed metal ring has 16 grooves that are equally spaced inward along its circumference. The bottom surface of the groove is flush with the top surface of the lower inner radiating patch.

[0009] As a preferred embodiment of this utility model, the first dielectric plate and the second dielectric plate are made of PPO material; the third dielectric plate is made of ceramic material.

[0010] As a preferred technical solution of this utility model, the upper radiating patch is provided with a first metal grounding via in the center. The first metal grounding via sequentially penetrates the second dielectric substrate, the lower inner radiating patch, the first dielectric substrate, and the square antenna metal cavity base and is grounded. Four capped metal feed probes are provided at equal intervals along the circumference of the first metal grounding via. The first capped metal feed probe is sequentially connected to the upper radiating patch, the lower inner radiating patch, and the feed network.

[0011] As a preferred technical solution of this utility model, the center of the anti-interference internal radiation patch is provided with a second metal grounding via hole, which sequentially penetrates the third dielectric plate and the square antenna metal cavity base and is grounded. Two capped metal feed probes are provided around the second metal grounding via. The second capped metal feed probes are connected in sequence to the anti-interference internal radiation patch and the feed network. The connection line from the center of one of the second capped metal feed probes to the center of the second metal grounding via is perpendicular to the connection line from the center of the other second capped metal feed probe to the center of the second metal grounding via.

[0012] Both the first capped metal feed probe and the second capped metal feed probe are welded together.

[0013] The beneficial effects of this utility model are as follows: This utility model uses a BeiDou multi-band array antenna composed of five independent antenna array elements (one central dual-frequency stacked antenna and four B3 band anti-interference unit antennas) to cover the BeiDou B1 / B3 bands, which meets the high-precision positioning requirements of BeiDou navigation equipment in the B1 / B3 bands. At the same time, it works with the back-end system link to achieve the B3 band anti-suppression interference requirements. This invention selects the metal radiating patch of the antenna array element by switching the radio frequency switching diode, thereby achieving flexible switching of the antenna resonant coupling frequency: in high-precision positioning scenarios, the resonant coupling frequency of the anti-interference array element is adjusted by frequency cutting, eliminating the coupling effect of the anti-interference array element on the central antenna array element; in anti-interference application scenarios, the resonant coupling frequency of the central array element is adjusted by frequency cutting, which can also eliminate the coupling effect of the central array element on the anti-interference array element. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is the radiation pattern at the B3 band operating frequency (1.268GHz) of the central dual-frequency stacked antenna of this utility model.

[0016] Figure 3 This is the radiation pattern at the B1 band operating frequency (1.575GHz) of the central dual-frequency stacked antenna of this utility model.

[0017] Figure 4 This is the radiation pattern at the operating frequency (1.268GHz) of the B3 band anti-interference unit antenna of this utility model.

[0018] Figure 5 This is an isolation curve of the B3 band antenna and the B3 band anti-interference unit antenna of the central dual-frequency stacked antenna of this utility model in high-precision positioning mode.

[0019] Reference numerals: 1-Center dual-band stacked antenna, 11-First dielectric substrate, 12-Lower outer radiating patch, 13-Lower inner radiating patch, 14-Second dielectric substrate, 15-Upper radiating patch, 16-First RF switching diode, 17-First capped metal feed probe, 18-First metal grounding via, 2-B3 band anti-interference element antenna, 21-Third dielectric substrate, 22-Anti-interference inner radiating patch, 23-Second RF switching diode, 24-Anti-interference outer radiating patch, 25-Second metal grounding via, 26-Second capped metal feed probe, 3-Serrated metal ring, 4-Square antenna metal cavity base. Detailed Implementation

[0020] like Figure 1As shown, this utility model proposes a Beidou high-precision anti-interference array antenna capable of mutual coupling cancellation, including a square antenna metal cavity base, a central dual-frequency stacked antenna, and four B3 band anti-interference unit antennas. The central dual-frequency stacked antenna is disposed on (usually mounted to) the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The central dual-frequency stacked antenna includes a first dielectric substrate, a lower inner radiating patch, a second dielectric substrate, and an upper radiating patch; The first dielectric substrate is disposed on the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The second dielectric plate is disposed on the radiating surface of the first dielectric plate, wherein the axis is coaxial with the central axis of the first dielectric plate; The lower inner radiation patch is disposed between the first dielectric substrate and the second dielectric substrate; The upper radiation patch is disposed on the top surface of the second dielectric plate; The four B3 band anti-interference unit antennas are respectively located at the four corners of the radiating surface of the square antenna metal cavity base; The B3 band anti-interference unit antenna includes a third dielectric substrate and an anti-interference internal radiation patch. The third dielectric substrate is disposed on the radiating surface of the square antenna metal cavity base; The anti-interference internal radiation patch is provided on the top surface of the third dielectric plate; The radiating surface of the square antenna metal cavity base is provided with a feed network (the feed network board contains radio frequency micro-strip lines, 3dB couplers, isolation resistors, matching separation components and other devices to realize the circular polarization characteristics of the antenna element). The central dual-band stacked antenna includes a B3 band antenna and a B1 band antenna, which can be selected for use through the RF interface output by the feed network; This includes toothed metal ferrules; The toothed metal ring is disposed on the radiating surface of the square antenna metal cavity base, wherein its axis is coaxial with the central axis of the square antenna metal cavity base; The central dual-frequency stacked antenna is located inside the toothed metal ring, with its axis coaxial with the central axis of the toothed metal ring. The central dual-frequency stacked antenna also includes a lower outer radiating patch and a first radio frequency switching diode; The lower outer radiating patch is disposed on the top surface of the first dielectric substrate and is located around the lower inner radiating patch; The lower outer radiating patch and the upper radiating patch are connected by the first radio frequency switching diode; The B3 band anti-interference unit antenna also includes an anti-interference external radiating patch and a second radio frequency switching diode. The anti-interference external radiation patch is disposed on the top surface of the third dielectric plate, located around the anti-interference internal radiation patch; The anti-interference external radiation patch and the anti-interference internal radiation patch are connected by the second radio frequency switch diode; Both the first RF switch diode and the second RF switch diode are soldered. The on / off state of the first or second RF switch diode is controlled by an external signal (system software command). When the system is used in high-precision positioning mode, the first or second RF switch diode is off. When the system is used in anti-interference mode, the first or second RF switch diode is on. The first and second RF switch diodes are set separately for these two states. When the RF switch is turned off, the anti-interference outer radiation patch of the anti-interference array element is disconnected from the anti-interference inner radiation patch, and the lower outer radiation patch of the central dual-frequency stacked antenna is disconnected from the upper radiation patch. At this time, the resonant frequency of the anti-interference array element is adjusted by frequency cutting, eliminating its coupling effect on the central array element. When the RF switch is turned on, the lower outer radiating patch of the central array element is connected to the upper radiating patch, and the anti-interference outer radiating patch of the anti-interference array element is connected to the anti-interference inner radiating patch. The resonant frequency of the central array element is adjusted by frequency cutting, eliminating its coupling effect on the anti-interference array element. The aforementioned RF switch configuration enables the antenna to maintain excellent performance even in miniaturized scenarios where the center-to-center spacing between array elements is less than 0.3 wavelengths: the isolation between the central array element and the anti-interference array element is improved from 15dB to over 35dB (an improvement of 20dB), completely solving the mutual coupling problem of close-pitch array elements.

[0021] As a preferred technical solution of this utility model, the lower outer radiation patch is in the shape of a ring, and four raised rectangular shapes are provided at equal intervals along the circumference of the inner side of the ring shape. The lower inner radiating patch is rectangular in shape, with rounded corners at the four corners, and the centers of the four sides of the rectangle protrude in a rectangular shape towards the lower outer radiating patch. The raised rectangular shape of the lower outer radiating patch and the raised rectangular shape of the lower inner radiating patch are connected by the first radio frequency switching diode.

[0022] As a preferred embodiment of this utility model, the anti-interference external radiation patch is in the shape of a rectangular ring, and the center of the four sides of the rectangular ring is connected to the center of the four sides of the anti-interference internal radiation patch through the second radio frequency switch diode.

[0023] The first and second RF switching diodes are controlled by external signals (IO level control, such as the MCU giving a high or low level to control the diode's on / off state).

[0024] The top surface of the toothed metal ring is flush with the top surface of the upper radiating patch. The top of the toothed metal ring has 16 grooves that are equally spaced inward along its circumference. The bottom surface of the groove is flush with the top surface of the lower inner radiating patch; The above settings effectively reduce the diffraction effect at the antenna edge, optimize the main lobe width and side lobe level of the radiation pattern, and further improve the spatial filtering performance against interference.

[0025] The first and second dielectric substrates are made of PPO material; the third dielectric substrate is made of ceramic material.

[0026] The upper radiating patch is provided with a first metal grounding via at its center. The first metal grounding via passes through the second dielectric substrate, the lower inner radiating patch, the first dielectric substrate, and the square antenna metal cavity base in sequence and is grounded. Four capped metal feed probes are provided at equal intervals along the circumference of the first metal grounding via. The first capped metal feed probe is sequentially connected to the upper radiating patch, the lower inner radiating patch, and the feed network.

[0027] The anti-interference internal radiation patch is provided with a second metal grounding via at its center. The second metal grounding via passes through the third dielectric substrate and the square antenna metal cavity base in sequence and is grounded. Two capped metal feed probes are provided around the second metal grounding via. The second capped metal feed probes are connected in sequence to the anti-interference internal radiation patch and the feed network. The connection line from the center of one of the second capped metal feed probes to the center of the second metal grounding via is perpendicular to the connection line from the center of the other second capped metal feed probe to the center of the second metal grounding via.

[0028] Both the first capped metal feed probe and the second capped metal feed probe are welded together.

[0029] Figure 2The radiation pattern at the B3 band operating frequency (1.268 GHz) of the center dual-band stacked antenna; The vertical axis represents gain, and the horizontal axis represents elevation angle. This figure illustrates the changes in elevation angle and gain at a frequency of 1.268 GHz and at azimuth angles of 0° and 90°, and yields the gain distribution of the center element B3 antenna at each elevation angle and azimuth angle. Figure 3 The radiation pattern at the B1 band operating frequency (1.575 GHz) of the center dual-band stacked antenna; The vertical axis represents gain, and the horizontal axis represents elevation angle. This figure illustrates the changes in elevation angle and gain at a frequency of 1.575 GHz and at azimuth angles of 0° and 90°, and yields the gain distribution of the center element B1 antenna at each elevation angle and azimuth angle. Figure 4 The radiation pattern of the B3 band anti-interference unit antenna at its operating frequency (1.268 GHz); The vertical axis represents gain, and the horizontal axis represents elevation angle. This figure illustrates the changes in elevation angle and gain at a frequency of 1.268 GHz and at azimuth angles of 0° and 90°, and yields the gain distribution of the side array B3 antenna at each elevation angle and azimuth angle. Figure 5 The isolation curves of the B3 band antenna and the B3 band anti-interference unit antenna of the central dual-frequency stacked antenna of this utility model in high-precision positioning mode are shown. The vertical axis represents isolation, and the horizontal axis represents frequency; this figure illustrates the isolation between the central array B3 antenna and each side array B3 antenna in the frequency range of 1GHz to 1.5GHz. This invention utilizes a BeiDou multi-band array antenna composed of five independent antenna elements (one central dual-frequency stacked antenna and four B3-band anti-interference unit antennas) to cover the BeiDou B1 / B3 frequency bands. This satisfies the high-precision positioning requirements of BeiDou navigation equipment in the B1 / B3 frequency bands, while simultaneously achieving anti-suppression interference requirements in the B3 frequency band in conjunction with the back-end system link. The aim is to meet the navigation equipment's requirements for resisting high-power suppression interference and to solve the problem of poor positioning accuracy of the central antenna element caused by the coupling effect of the anti-interference antenna elements. This invention selects the metal radiating patch of the antenna array element by switching the radio frequency diode, thereby achieving flexible switching of the antenna resonant coupling frequency. In high-precision positioning scenarios, the resonant coupling frequency of the anti-interference array element is adjusted by frequency cutting, eliminating the coupling effect of the anti-interference array element on the central antenna array element. In anti-interference application scenarios, the resonant coupling frequency of the central array element is adjusted by frequency cutting, which can also eliminate the coupling effect of the central array element on the anti-interference array element. In particular, when the center-to-center distance between the anti-interference array element and the central array element is less than 0.3 wavelengths, the benefit is significant. The gain performance of the central array element is improved by more than 3dB to more than 6.5dBi (i.e., an improvement of more than 50%), the phase center stability is improved from ±6mm to ±2mm (an improvement of more than 66%), and the isolation between the central array element and the anti-interference array element is improved from 15dB to more than 35dB. Specifically: High-precision positioning mode (switch off): When the system is in high-precision positioning mode, both the first RF switch diode 16 (connecting the lower outer radiating patch 12 and the upper radiating patch 15) and the second RF switch diode 23 (connecting the anti-interference outer radiating patch 24 and the anti-interference inner radiating patch 22) are in the off state. Working state of the central array element: The central dual-frequency stacked antenna 1 works only through the lower inner radiating patch 13 and the upper radiating patch 15 (the lower outer radiating patch 12 does not participate). At this time, the resonant frequency of the antenna is concentrated in the B1 (1.575GHz) / B3 (1.268GHz) band, which ensures the high gain (above 6.5dBi) and stable phase center (within ±2mm) required for high-precision positioning. Anti-interference array element working state: Anti-interference element antenna 2 works only through anti-interference inner radiation patch 22 (anti-interference outer radiation patch 24 does not participate). At this time, the resonant frequency of the anti-interference array element is adjusted to a non-B1 / B3 frequency band, eliminating its coupling effect on the central array element (isolation is improved to more than 35dB), and avoiding interference of the anti-interference array element to the central positioning signal. Anti-interference mode (switch on): When the system is in anti-interference mode, both the first RF switching diode 16 and the second RF switching diode 23 are in the ON state: The central array element is in operation as follows: the lower outer radiating patch 12 (circular shape with four raised rectangles on the inside) and the lower inner radiating patch 13 (rectangular with four protrusions) are connected through the first RF switching diode 16, which expands the radiation area of ​​the central array element and adjusts the resonant frequency to better meet the anti-interference requirements of the B3 band; at the same time, the upper radiating patch 15 and the lower inner radiating patch 13 are connected through the first capped metal feed probe 17 to ensure effective signal transmission. Anti-interference array element working status: The anti-interference outer radiation patch 24 (rectangular ring shape) and the anti-interference inner radiation patch 22 are connected through the second RF switch diode 23, which expands the resonant bandwidth of the anti-interference array element and enhances the ability to suppress interference signals in the B3 band; the four anti-interference array elements are distributed at the four corners of the base 4, and together with the adaptive interference suppression algorithm of the back-end system, spatial filtering of interference signals (suppressing interference from all directions) can be achieved to ensure clear reception of useful signals; The function of the toothed metal ring: The 16 grooves of the toothed metal ring 3 change the electric field distribution around the antenna, reduce the influence of edge diffraction on the radiation pattern, optimize the directivity of the main lobe, and further improve the spatial filtering effect of anti-interference.

[0030] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A Beidou high-precision anti-interference array antenna capable of mutual coupling cancellation, comprising a square antenna metal cavity base (4), a central dual-frequency stacked antenna (1), and four B3 band anti-interference unit antennas (2). The central dual-frequency stacked antenna (1) is located on the radiating surface of the square antenna metal cavity base (4), wherein its axis is coaxial with the central axis of the square antenna metal cavity base (4); The central dual-frequency stacked antenna (1) includes a first dielectric substrate (11), a lower inner radiating patch (13), a second dielectric substrate (14), and an upper radiating patch (15). The first dielectric plate (11) is disposed on the radiating surface of the square antenna metal cavity base (4), wherein the axis is coaxial with the central axis of the square antenna metal cavity base (4); The second dielectric plate (14) is disposed on the radiating surface of the first dielectric plate (11), wherein the axis is coaxial with the central axis of the first dielectric plate (11); The lower inner radiation patch (13) is disposed between the first dielectric plate (11) and the second dielectric plate (14); The upper radiation patch (15) is disposed on the top surface of the second dielectric plate (14); The four B3 band anti-interference unit antennas (2) are respectively located at the four corners of the radiating surface of the square antenna metal cavity base (4); The B3 band anti-interference unit antenna (2) includes a third dielectric substrate (21) and an anti-interference internal radiation patch (22). The third dielectric plate (21) is disposed on the radiating surface of the square antenna metal cavity base (4); The top surface of the third dielectric plate (21) is provided with the anti-interference internal radiation patch (22). The radiating surface of the square antenna metal cavity base (4) is provided with a feeding network; Its features are: It also includes a toothed metal ferrule (3); The toothed metal ring (3) is disposed on the radiating surface of the square antenna metal cavity base (4), wherein its axis is coaxial with the central axis of the square antenna metal cavity base (4); The central dual-frequency stacked antenna (1) is located inside the toothed metal ring (3), with its axis coaxial with the central axis of the toothed metal ring (3); The central dual-frequency stacked antenna (1) also includes a lower outer radiating patch (12) and a first radio frequency switching diode (16). The lower outer radiation patch (12) is disposed on the top surface of the first dielectric plate (11) and located around the lower inner radiation patch (13); The lower outer radiating patch (12) and the upper radiating patch (15) are connected through the first radio frequency switching diode (16); The B3 band anti-interference unit antenna (2) also includes an anti-interference external radiation patch (24) and a second radio frequency switching diode (23). The anti-interference external radiation patch (24) is disposed on the top surface of the third dielectric plate (21) and located around the anti-interference internal radiation patch (22); The anti-interference external radiation patch (24) and the anti-interference internal radiation patch (22) are connected by the second radio frequency switch diode (23).

2. The BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The lower outer radiation patch (12) is in the shape of a ring, and four raised rectangular shapes are provided at equal intervals along its circumference on the inner side of the ring shape. The lower inner radiating patch (13) is rectangular in shape, with rounded corners at the four corners. The center of each of the four sides of the rectangular shape protrudes into a rectangular shape towards the lower outer radiating patch (12). The raised rectangular shape of the lower outer radiating patch (12) and the raised rectangular shape of the lower inner radiating patch (13) are connected by the first radio frequency switching diode (16).

3. The BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The anti-interference external radiation patch (24) is in the shape of a rectangular ring, and the center of the four sides inside the rectangular ring is connected to the center of the four sides of the anti-interference internal radiation patch (22) through the second radio frequency switch diode (23).

4. A BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to any one of claims 1-3, characterized in that: The opening and closing of the first RF switching diode (16) and the second RF switching diode (23) are controlled by an external signal.

5. A BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The top surface of the toothed metal ring (3) is flush with the top surface of the upper radiation patch (15); The top of the toothed metal ring (3) has 16 grooves that are equally spaced inward along its circumference. The bottom surface of the groove is flush with the top surface of the lower inner radiation patch (13).

6. A BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The first dielectric substrate (11) and the second dielectric substrate (14) are made of PPO material; the third dielectric substrate (21) is made of ceramic material.

7. A BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The upper radiating patch (15) has a first metal grounding via (18) at its center. The first metal grounding via (18) passes through the second dielectric substrate (14), the lower inner radiating patch (13), the first dielectric substrate (11), and the square antenna metal cavity base (4) in sequence and is grounded. Four first capped metal feed probes (17) are provided at equal intervals along the circumference of the first metal grounding via (18). The first capped metal feed probe (17) is connected in sequence to the upper radiating patch (15), the lower inner radiating patch (13) and the feed network.

8. A BeiDou high-precision anti-interference array antenna capable of mutual coupling cancellation according to claim 1, characterized in that: The anti-interference internal radiation patch (22) has a second metal grounding via (25) at its center. The second metal grounding via (25) passes through the third dielectric substrate (21) and the square antenna metal cavity base (4) in sequence and is grounded. Two second capped metal feed probes (26) are provided around the second metal grounding via (25). The second capped metal feed probes (26) are connected to the anti-interference inner radiation patch (22) and the feed network in sequence. The connection line from the center of one of the second capped metal feed probes (26) to the center of the second metal ground via (25) is perpendicular to the connection line from the center of the other second capped metal feed probe (26) to the center of the second metal ground via (25).

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