An anti-interference dual-frequency antenna and its application in drones

Abstract

The present invention discloses an anti-interference dual-frequency antenna and its application in a drone. The antenna of the present invention includes a first antenna, a second antenna, a shielding cover, a choke module, and a metal support assembly. The metal support assembly runs through the choke module and includes a plurality of metal rings with different radii. The present invention provides a dual-frequency antenna with excellent anti-interference performance, which is particularly suitable for application scenarios such as drones. The antenna introduces a plurality of choke assemblies and metal support columns of different heights to significantly improve the ability to suppress the back lobe level by optimizing the radiation pattern, thereby reducing the potential interference of the drone fuselage surface current on the antenna radiation and enhancing the overall performance of the antenna.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and in particular relates to an anti-interference dual-frequency antenna and an application thereof on a drone. Background Art

[0002] The construction of the Global Navigation Satellite System (GNSS) has brought great convenience to people all over the world. Antennas, as devices for transmitting and receiving electromagnetic waves, play an extremely important role in it. L1 and L5 are the two core communication frequency bands in the global satellite navigation system, and are widely used in the aerospace and military fields. For example, a L1 / L5 dual-frequency antenna array is installed on a drone. Through L1 and L5 dual-frequency positioning, higher positioning accuracy and anti-interference performance can be achieved than single-frequency positioning. However, this positioning antenna is usually installed on the top of the drone, and the surface current of the fuselage will flow into the antenna from the bottom, thereby deteriorating the radiation performance of the antenna and reducing the positioning accuracy of the antenna.

[0003] There are few reports on anti-interference dual-frequency antenna arrays in UAV-mounted environments.

[0004] Therefore, how to effectively minimize the impact of the UAV fuselage surface current on the antenna has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide an anti-interference dual-frequency antenna and its application in drones.

[0006] The present invention is implemented in this way. In a first aspect, the present invention provides an anti-interference dual-frequency antenna, comprising:

[0007] A first antenna; wherein the first antenna comprises n first antenna units and a first power divider for feeding all the first antenna units; n>1;

[0008] A second antenna; wherein the second antenna comprises n second antenna units and a second power divider for feeding all the second antenna units;

[0009] A shielding cover, which is arranged below the first antenna and the second antenna;

[0010] A choke module is arranged below the shielding cover; wherein the choke module comprises a plurality of choke components stacked up and down;

[0011] A metal support component runs through the choke module; wherein the metal support component includes a plurality of metal rings with different radii, each metal ring having a different radius and the same center.

[0012] Preferably, in the first antenna, each first antenna unit includes a first radiator, a first medium, a first metal layer, a second medium, a second metal layer, a third medium, and a first coaxial probe arranged in sequence; the first medium and the first metal layer are both provided with a first through hole, the first coaxial probe passes through the first through hole and the second medium and realizes that the first radiator at both ends contacts the first power divider respectively; there is an air medium between the first coaxial probe and the inner wall of the first through hole.

[0013] The first metal layer serves as a ground plane of the first antenna unit.

[0014] Preferably, in the second antenna, each second antenna unit includes a second radiator, a fourth medium, a second coaxial probe, and a second medium, a second metal layer, and a third medium shared with the first antenna unit.

[0015] The second medium has a groove, the fourth medium is located in the groove, and there is a distance between the fourth medium and the inner wall of the groove.

[0016] The upper and lower ends of the fourth medium are in contact with the second radiator and the second metal layer respectively; there is a distance between the second medium and the fourth medium, and the height of the fourth medium is greater than that of the first medium; the second metal layer serves as the ground plane of the second antenna unit.

[0017] The fourth medium and the second metal layer both have second through holes, the second coaxial probe passes through the second through hole and the third medium and the second radiator at both ends contacts the second power divider; there is air medium between the second coaxial probe and the inner wall of the first through hole.

[0018] Preferably, the operating frequency of the first antenna and the second antenna is L band.

[0019] Preferably, the first antenna unit and the second antenna unit are arranged alternately along a circumference.

[0020] Preferably, the shielding cover is located below the third medium and is a hollow cylindrical structure, which can completely cover the first antenna and the second antenna.

[0021] Preferably, in the choke module, all choke components have the same diameter, and the spacing between adjacent choke components is the same; there is an air layer between adjacent choke components. More preferably, the diameter of the choke component is greater than the diameter of the shielding cover.

[0022] Preferably, in the metal support assembly, the radius range of multiple metal rings satisfies [0, R], R>0; each metal ring is a ring structure composed of a number of metal support columns periodically distributed circumferentially; the metal support columns in the same metal ring have the same height, the metal support columns of different metal rings have different heights, and the spacing between adjacent metal rings is not exactly the same.

[0023] More preferably, the first medium and the fourth medium are made of ceramic, and the second medium and the third medium are made of FR4 board.

[0024] In a second aspect, the present invention also provides the application of an anti-interference dual-frequency antenna on a drone.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a dual-frequency antenna with excellent anti-interference performance, which is particularly suitable for application scenarios such as drones. The antenna introduces multiple choke components and metal support columns of different heights to optimize the radiation pattern, significantly improving the suppression ability of the back lobe level, thereby reducing the potential interference of the drone body surface current on the antenna radiation and enhancing the overall performance of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a three-dimensional view of the anti-interference dual-frequency antenna array of the present invention.

[0029] Figure 2 It is a top view of the L1 / L5 dual-frequency antenna array of the present invention.

[0030] Figure 3 is a stacking diagram of the first antenna unit of the present invention.

[0031] Figure 4 is a top view of the first antenna unit of the present invention.

[0032] Figure 5 It is a top view of the first power divider for feeding the first antenna unit of the present invention.

[0033] Figure 6 It is a side view of the first power divider for feeding the first antenna unit of the present invention.

[0034] Figure 7 It is a stacking diagram of the second antenna unit of the present invention.

[0035] Figure 8 It is a top view of the second antenna unit of the present invention.

[0036] Fig. 9 It is a top view of the second power divider for feeding the second antenna unit of the present invention.

[0037] Fig.10 It is a top view of the ground plane (second metal layer) of the antenna array of the present invention.

[0038] Fig.11 It is a top view of the shielding cover of the present invention.

[0039] Fig.12 It is a side view of the shielding cover of the present invention.

[0040] Fig.13 It is a side view of the choke assembly of the present invention without loading the metal column.

[0041] Fig.14 It is a top view of the metal column loaded with the choke assembly of the present invention.

[0042] Fig.15 It is a diagram of the simulation results of S11 and S22 of the present invention.

[0043] Fig.16 This is the radiation pattern of the present invention when operating at 1.176 GHz without loading the choke component.

[0044] Fig.17 This is the radiation pattern of the present invention when loaded with a choke component and operating at 1.176 GHz.

[0045] Fig.18 This is the radiation pattern of the present invention when operating at 1.575 GHz without loading the choke component.

[0046] Fig.19 This is the radiation pattern of the present invention when loaded with a choke component and operating at 1.575 GHz.

[0047] Markings in the figure: 1. first antenna; 11. first antenna unit; 111. first radiator; 112. first dielectric; 113. first metal layer; 114. second dielectric; 1141. slot; 115. second metal layer; 1151. third through hole; 1152. metal short-circuit column; 116. third dielectric; 117. first through hole; 118. first coaxial probe; 12. first power divider; 121. first input section; 122. first connecting section; 123. first output section; 1231. output front section; 1232. output rear section; 1233. metal transition column; 2. Second antenna; 21. Second antenna unit; 211. Second radiator; 212. Fourth medium; 213. Second through hole; 214. Second coaxial probe; 22. Second power divider; 221. Second input section; 222. Second connecting section; 223. Second output section; 3. Shielding cover; 4. Choke module; 41. First choke assembly; 42. Second choke assembly; 43. Third choke assembly; 5. Metal support assembly; 51. First metal support column; 52. Second metal support column; 53. Third metal support column; 54. Fourth metal support column; 55. Fifth metal support column. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, it is defined that features such as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0051] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0052] An anti-interference dual-band antenna, such as Figure 1-2 It includes: a first antenna 1, a second antenna 2, a shielding cover 3, and a choke module 4;

[0053] The first antenna 1 includes four first antenna units 11 and a first power divider 12 which are centrally symmetrically distributed. Figure 3-4 Each first antenna unit 11 includes a first radiator 111, a first medium 112, a first metal layer 113, a second medium 114, a second metal layer 115, and a third medium 116 arranged in sequence; the first medium 112 and the first metal layer 113 are penetrated by a first through hole 117, the first coaxial probe 118 penetrates the first through hole 117 and the second medium 114 and realizes that the first radiator 111 at both ends is in contact with the first power divider 12; there is an air medium between the first coaxial probe 118 and the inner wall of the first through hole 117; in order to prevent the first coaxial probe 118 and the second metal layer 115 from short-circuiting, the side length of the first through hole 117 is gs=2mm.

[0054] The length of the first radiator 111 is pw2=27.5 mm, and a pair of chamfers dj2=3 mm are formed at the diagonals.

[0055] The first medium 112 is made of ceramic, has a thickness of ch2 = 4 mm, and a length of cw2 = 30 mm.

[0056] The second medium 114 and the third medium 116 are both made of FR4 plates, and have the same thickness of sh=0.8 mm. The second medium 114, the third medium 116 and the second metal layer 115 are all circular, and have a diameter of gr=280 mm.

[0057] The first metal layer 113 serves as a ground plane of the first antenna unit 11 , and is made of copper.

[0058] like Fig.10As shown, the second metal layer 115 has four third through holes 1151; two rows of metal short-circuit posts 1152 are arranged on both sides of the long sides of the third through holes 1151 of the second metal layer 115, and the metal short-circuit posts 1152 connect the first metal layer 113 and the second metal layer 115; there is a gap between adjacent metal short-circuit posts 1152 in the same row. The two connected metal layers (the first metal layer 113 and the second metal layer 115) become the common ground plane of the first antenna unit 11 and the second antenna unit 21, and the length of the third through hole 1151 is gs1=23mm and the width is gs2=4mm.

[0059] like Figure 5-6 As shown, the first power divider 12 is a one-to-four power divider of a "T"-shaped structure, including a first input section 121, a first connecting section 122, and four first output sections 123; one end of the first input section 121 serves as a feeding port, and the other end is connected to the input end of the first connecting section 122; the four output ends of the first connecting section 122 are respectively connected to the input ends of the four first output sections 123; the first input section 121 and the first connecting section 122 are located between the first medium 112 and the second medium 114.

[0060] Each first output section 123 includes an output front section 1231, an output back section 1232, and a metal transition column 1233; one end of the output back section 1232 is connected to the first coaxial probe 118, and the other end is connected to one end of the metal transition column 1233; the other end of the metal transition column 1233 is connected to one end of the output front section 1231; the other end of the output front section 1231 is connected to an output end of the first connecting section 122; the output front section 1231 is located between the first medium 112 and the second medium 114, and does not contact the first metal layer 113; the output back section 1232 is printed on the lower surface of the substrate of the second medium 114, and in order to avoid contact with the second metal layer 115, the third through hole 1151 is dug out on the second metal layer 115, the output back section 1232 is located in the third through hole 1151 of the second metal layer 115, and does not contact the second metal layer 115; the metal transition column 1233 runs through the second medium 114.

[0061] The impedance of the first input section 121 and the first output section 123 are both 50 ohms, and there is a square pad at the end of the first output section 123 for connecting the first coaxial probe 118, and the side length of the pad is dr = 2mm. The dimensions of each transmission line section are as follows: mw = 1.5mm, ml = 22mm, mw1 = 0.7mm, ml1 = 25mm, ml2 = 25mm.

[0062] The feeding point of the first coaxial probe 118 is located below the secondary diagonal of the first radiator 111 along the negative x-axis direction and at a distance of fh2=2.5 mm from the center of the unit, so it radiates right-handed circularly polarized waves. The first coaxial probe 118 is used to connect the first radiator 111 and the first power divider 12.

[0063] The second antenna 2 includes a plurality of second antenna units 21 and a second power divider 22 which are centrally symmetrically distributed; Figure 7-8 Each second antenna unit 21 includes a second radiator 211 , a fourth medium 212 , and a second medium 114 , a second metal layer 115 , and a third medium 116 that are shared with the first antenna unit 11 .

[0064] The fourth medium 212 is made of ceramic, with a relative dielectric constant εr=12, a thickness of ch1=6 mm, and a length of cw1=36.5 mm.

[0065] The second radiator 211 is a silver layer printed on the surface of the ceramic medium. The silver layer is a square structure with a length of pw1=34.7 mm and a pair of chamfers dj1=4.5 mm at the diagonals.

[0066] The second medium 114 has a groove 1141 , the fourth medium 212 is located in the groove 1141 , and there is a distance between the fourth medium 212 and the inner wall of the groove 1141 .

[0067] The upper and lower ends of the fourth medium 212 are in contact with the second radiator 211 and the second metal layer 115 respectively; there is a distance between the second medium 114 and the fourth medium 212, and the height of the fourth medium 212 is greater than the height of the first medium 112; the second metal layer 115 serves as the ground plane of the second antenna unit 21, and the second metal layer 115 is made of copper.

[0068] The fourth medium 212 and the second metal layer 115 are both provided with a second through hole 213, the second coaxial probe 214 passes through the second through hole 213 and the third medium 116 and realizes that the second radiator 211 and the second power divider 22 are in contact at both ends; there is an air medium between the second coaxial probe 214 and the inner wall of the first through hole 117; the feeding point of the second coaxial probe 214 is located below the secondary diagonal of the second radiator 211 along the negative x-axis direction and at a distance of fh1=3mm from the center of the unit, so the second antenna unit 21 also radiates right-hand circularly polarized waves, the width of the second coaxial probe 214 is fw=1mm, and the second coaxial probe 214 is used to connect the second radiator 211 and the second power divider 22.

[0069] The second power divider 22 is a one-to-four-way power divider of a “T”-shaped structure, and is located below the third medium 116 . The second power divider 22 includes a second input section 221 , a second connecting section 222 , and four second output sections 223 .

[0070] One end of the second input section 221 serves as a feeding port, and the other end is connected to the input end of the second connecting section 222; the four output ends of the second connecting section 222 are respectively connected to the input ends of the four second output sections 223; the output ends of the four second output sections 223 are all connected to a second coaxial probe 214 of the second antenna unit 21.

[0071] The impedance of the second input section 221 and the second output section 223 are both 50 ohms. In addition, there is a circular pad at the end of the second output section 223 for connecting the second coaxial probe 214, and the pad diameter is dc=2.5mm. The dimensions of each transmission line section are as follows: sw=1.5mm, sl=30mm, sw1=0.8mm, sl1=35mm, sl2=20mm.

[0072] In order to feed the first antenna unit 11 and the second antenna unit 21 , the first power divider 12 and the second power divider 22 are not symmetrical about the center of the second metal layer 115 , but are offset relative to the center.

[0073] The operating frequency of the first antenna unit 11 is 1.575 GHz in the L band, that is, the L5 band, and the operating frequency of the second antenna unit 21 is 1.176 GHz in the L band, that is, the L1 band.

[0074] The first antenna unit 11 and the second antenna unit 21 are arranged alternately along a circle; the height of the first antenna unit 11 is lower than that of the second antenna unit 21 .

[0075] Reference Figure 2 As shown, it is a top view of the L1 / L5 dual-frequency antenna array of the present invention. The distance between adjacent second antenna units 21 is dl=120mm, which is about 0.47λ0 at 1.176GHz (λ0 is a wavelength in vacuum). The distance between adjacent first antenna units 11 is dh=100mm, which is about 0.52λ0 at 1.575GHz. There is also a distance between the first antenna unit 11 and the adjacent second antenna unit 21.

[0076] Reference Figure 11-12The figure shows a top view and a side view of the shielding cover 3 of the present invention. The shielding cover 3 is arranged below the first antenna 1 and the second antenna 2, and is further arranged below the third medium 116. The shielding cover 3 is a hollow cylindrical structure. The center of the shielding cover 3 coincides with the center of the second metal layer 115 in the vertical direction, and can completely cover the first power divider 12 and the second power divider 22. The diameter of the shielding cover 3 is rq=210mm, the wall thickness is dq=1mm, and the height is hq=15mm. The first antenna 1 and the second antenna 2 are located above the middle hollow area of ​​the shielding cover 3. The first antenna unit 11 and the second antenna unit 21 are symmetrical about the center of the shielding cover 3 and the center of the second metal layer 115.

[0077] Reference Fig.13 The figure shows a side view of the choke assembly of the present invention without loading the metal support column; the choke module 4 is arranged below the shielding cover 3. More specifically, the choke module 4 of the present embodiment includes three circular structure choke assemblies stacked up and down, namely, the first choke assembly 41, the second choke assembly 42, and the third choke assembly 43; the first choke assembly 41 is close to the lower surface of the shielding cover 3, and the centers of the first choke assembly 41, the second choke assembly 42, and the third choke assembly 43 overlap in the vertical direction; the spacing between adjacent choke assemblies is the same, which is h=12mm, and the diameters of all choke assemblies are the same, which is r=300mm.

[0078] Reference Fig.14The figure shows a top view of the choke assembly of the present invention loaded with metal support columns, which are used to connect and support the first choke assembly 41, the second choke assembly 42, and the third choke assembly 43. The metal support assembly 5 that runs through the choke module 4 includes 5 metal rings from the inside to the outside, and the 5 metal rings have different radii and the centers of the circles coincide. The first metal ring is composed of a first metal support column 51 located at the center of the choke module 4, and the height of the first metal support column 51 is 2×h=24mm, connecting all three layers of choke assemblies; the second metal ring is formed by a plurality of second metal support columns 52 arranged along the circumference at equal intervals, and the height of the second metal support column 52 is 2×h=24mm, and also connecting all three layers of choke assemblies; the third metal ring is formed by a plurality of third metal support columns 53 arranged along the circumference at equal intervals, and the height of the third metal support column 53 is h=12mm, and only connects the second choke assembly 4. 2 and the third choke assembly 43; the fourth metal ring is formed by a plurality of fourth metal support columns 54 arranged at equal intervals along the circumference, and the height of the fourth metal support columns 54 can be arbitrary, so the fourth metal support columns 54 can be connected to the first choke assembly 41, the second choke assembly 42, or the second choke assembly 42, the third choke assembly 43, or the three-layer choke assembly; the fifth metal ring is formed by a plurality of fifth metal support columns 55 arranged at equal intervals along the circumference, and the height of the fifth metal support columns 55 can be arbitrary, so the fifth metal support columns 55 can be connected to the first choke assembly 41, the second choke assembly 42, or the second choke assembly 42, the third choke assembly 43, or the three-layer choke assembly.

[0079] In addition, the distances between the adjacent metal support columns along the y-axis direction are not exactly the same. The distance between the first metal support column 51 and the second metal support column 52 is d1; the distances from the fourth metal support column 54 to the third metal support column 53 and the fifth metal support column 55 are the same, denoted as d3; and the distance between the fourth metal support column 54 and the edge of the choke assembly is d2 = 65mm;

[0080] Furthermore, the metal support column of the present invention is characterized in that the radiation pattern of the antenna array shows a regular change with the adjustment of the above d1 and d3, especially in the suppression of the back lobe level, which can be described as: as d1 decreases, the back lobe level of the pattern will decrease accordingly, however, when it exceeds a certain value, the back lobe level will deteriorate in the opposite direction; as d3 increases, the "null" of the pattern (Theta=110°) will become deeper, and similarly, when it exceeds a certain value, the "null" disappears. The optimized limit values ​​are d1=20mm and d3=25mm.

[0081] Assemble all parts, refer to Figure 1 , which is a three-dimensional view of the anti-interference dual-frequency antenna array carried by the UAV of the present invention.

[0082] Reference Fig.15 As shown in the figure, the S parameter simulation results of the anti-interference dual-frequency antenna array carried by the UAV of the present invention, at 1.176GHz and 1.575GHz, S11 and S22 are both <-25dB, indicating that the dual-frequency antenna array has achieved good impedance matching in the L5 and L1 frequency bands.

[0083] In order to compare the effect of the choke component on the dual-frequency antenna array, the radiation patterns of the dual-frequency antenna array without and with the choke component are given at 1.176GHz excitation, and all azimuth planes of Phi from 0° to 360° are observed in the radiation pattern. Figure 16-17 When the choke component is not loaded, the main lobe peak gain of the antenna is 7.3dBi, the front-to-back ratio is -27.2dB, and the null depth is -17.5dBi; when the choke component is loaded, the main lobe peak gain is 8dBi, the front-to-back ratio is -39.8dB, and the null depth is -22.5dBi.

[0084] Similarly, the radiation pattern of 1.575GHz excitation is given, refer to Figure 18-19 When the choke component is not loaded, the peak gain of the antenna is 8dBi, the front-to-back ratio is -25.4dB, and the null depth is -18dBi; when the choke component is loaded, the peak gain is 8.3dBi, the front-to-back ratio is -49.7dB, and the null depth is -20dBi.

[0085] The above descriptions are only embodiments of the present invention and should not be construed as limiting the scope of the present invention. For those skilled in the art, the claims and drawings may be modified, innovated or applied to other technical fields. However, it should be noted that all modifications to the present invention should be included within the scope of patent protection of the present invention.

Claims

1. An anti-interference dual-band antenna, Features The antenna comprises: A first antenna (1); A second antenna (2); A shielding cover (3) arranged below the first antenna (1) and the second antenna (2); A choke module (4), which is arranged below the shielding cover (3); A metal support component (5) which passes through the choke module (4); The first antenna (1) comprises n first antenna units (11) and a first power divider (12) for feeding all the first antenna units (11); the second antenna (2) comprises n second antenna units (21) and a second power divider (22) for feeding all the second antenna units (21); The choke module (4) comprises a plurality of choke components stacked one above the other; The metal support assembly (5) comprises a plurality of metal rings; each metal ring has a different radius and a same center; In the first antenna (1), the n first antenna units (11) are distributed in a centrally symmetrical manner, and each first antenna unit (11) comprises a first radiator (111), a first medium (112), a first metal layer (113), a second medium (114), a second metal layer (115), a third medium (116), and a first coaxial probe (118) which are arranged in sequence; the first medium (112) and the first metal layer (113) are both provided with a first through hole (117); the first coaxial probe (118) penetrates the first through hole (117) and the second medium (114) and realizes that the first radiator (111) and the first power divider (12) are in contact at both ends; and an air medium exists between the first coaxial probe (118) and the inner wall of the first through hole (117); In the second antenna (2), the n second antenna units (21) are centrally symmetrically distributed, and each second antenna unit (21) comprises a second radiator (211), a fourth medium (212), a second coaxial probe (214), and a second medium (114), a second metal layer (115), and a third medium (116) shared with the first antenna unit (11); The second medium (114) is provided with a groove (1141), the fourth medium (212) is located in the groove (1141), and there is a distance between the fourth medium (212) and the inner wall of the groove (1141); The upper and lower ends of the fourth medium (212) are in contact with the second radiator (211) and the second metal layer (115) respectively; there is a distance between the second medium (114) and the fourth medium (212); The fourth medium (212) and the second metal layer (115) are both provided with a second through hole (213); the second coaxial probe (214) passes through the second through hole (213) and the third medium (116) and realizes contact between the second radiator (211) and the second power divider (22) at both ends; and there is an air medium between the second coaxial probe (214) and the inner wall of the second through hole (213).

2. According to claim 1, an anti-interference dual-frequency antenna, It is characterized in that A row of metal short-circuit columns (1152) are respectively provided on both sides of the third through hole (1151) of the second metal layer (115), and the metal short-circuit columns (1152) connect the first metal layer (113) and the second metal layer (115).

3. According to claim 1, an anti-interference dual-frequency antenna, It is characterized in that The first medium (112) and the fourth medium (212) are made of ceramic, and the second medium (114) and the third medium (116) are made of FR4 board.

4. According to claim 1, an anti-interference dual-frequency antenna, It is characterized in that The operating frequency of the first antenna (1) and the second antenna (2) is L band.

5. The anti-interference dual-frequency antenna according to claim 1, It is characterized in that The first antenna unit (11) and the second antenna unit (21) are arranged alternately along a circle.

6. The anti-interference dual-frequency antenna according to claim 1, It is characterized in that All choke assemblies have the same diameter and the spacing between adjacent choke assemblies is the same.

7. An anti-interference dual-frequency antenna according to claim 1 or 6, It is characterized in that There is an air layer between adjacent choke components.

8. The anti-interference dual-frequency antenna according to claim 1, It is characterized in that The metal support columns in the same metal ring have the same height, the metal support columns in different metal rings have different heights, and the spacings between adjacent metal rings are not completely the same.

9. Application of the anti-interference dual-frequency antenna described in any one of claims 1 to 8 on a drone.

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