A multi-standard mobile communication signal direction-finding antenna

Abstract

The present invention discloses a multi-standard mobile communication signal direction-finding antenna, including a low-frequency antenna array and a high-frequency antenna array; the low-frequency antenna array includes a plurality of low-frequency circularly polarized antennas arranged in an L-shape on the same horizontal plane, the low-frequency circularly polarized antenna includes an upper microstrip antenna, a middle microstrip antenna, a bottom microstrip antenna, a feed network layer and a ground plane, and the high-frequency antenna array includes a plurality of high-frequency circularly polarized antennas arranged in an L-shape on the same horizontal plane; the high-frequency circularly polarized antenna includes a first Vivaldi antenna array and a second Vivaldi antenna array that are orthogonal to each other. The present invention has a simple structure and a reasonable design, and designs low-frequency circularly polarized antennas for use in 0.8GHz to 0.96GHz and high-frequency circularly polarized antennas for use in 1.7GHz to 2.7GHz, respectively. The use of these two circularly polarized antennas can achieve the effect of full-band coverage; using low-frequency circularly polarized antennas and high-frequency circularly polarized antennas as array elements, two groups of L-shaped direction-finding arrays are designed respectively, so as to solve the problem of large size and narrow bandwidth of the direction-finding array.

Description

Technical Field

[0001] The invention belongs to the technical field of antenna communication, and in particular relates to a multi-standard mobile communication signal direction-finding antenna. Background Art

[0002] At present, radio technology has developed rapidly. As an important technical means of radio monitoring, technical reconnaissance and electronic countermeasures, radio direction finding has received more and more attention in the industry. Radio direction finding equipment uses antennas to find beacons or signal sources. Direction finding antennas are an important part of radio direction finding equipment. The performance of direction finding antennas, especially the performance of the directional pattern, determines the sensitivity of radio direction finding equipment.

[0003] The direction finding antenna is the front-end component used to transmit and receive electromagnetic waves in the mobile communication signal direction finding system. Its function is to convert electromagnetic waves into induced electromotive force. In the mobile communication signal direction finding system, the antenna plays a vital role. Improving the technical performance of the direction finding antenna is of great significance to improving the comprehensive performance and practical value of the entire mobile communication signal direction finding system.

[0004] Due to the rapid development of my country's mobile communications industry, 2G / 3G / 4G networks coexist, and the mobile communications network is built and managed by China Mobile, China Unicom, and China Telecom. The three major domestic operators use a wide variety of mobile communications standards, including GSM, DSC, CDMA, and LTE. The frequencies used by their uplinks and downlinks are distributed in the two frequency bands of 0.8GHz-0.96GHz and 1.7GHz-2.7GHz.

[0005] The portable mobile direction-finding systems currently available on the market have the problem of insufficient working bandwidth. For example, Datang Mobile's mobile phone code detection and direction-finding system cannot support mobile phone direction-finding of DSC and CDMA communication standards. This is because the direction-finding antenna used by the system has an operating frequency band of only 0.89GHz-0.96GHz and 2.3GHz-2.7GHz, which will cause the problem of missed detection of mobile phones. Only by expanding the working bandwidth of the direction-finding antenna to the full frequency band of the mobile communication network can the availability of the direction-finding system for mobile communication signals of various standards be ensured, thereby improving the practicality of the mobile communication direction-finding system. Therefore, a small broadband circularly polarized antenna for direction-finding of mobile communication signals of various standards is needed, which can solve the outstanding problems of the existing direction-finding antennas such as large size and narrow bandwidth. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a multi-standard mobile communication signal direction-finding antenna in view of the deficiencies in the above-mentioned prior art. The antenna has a simple structure and a reasonable design. Two circularly polarized antennas are designed for use in the 0.8GHz to 0.96GHz and 1.7GHz to 2.7GHz frequency bands, respectively. The use of these two circularly polarized antennas can achieve the effect of full-band coverage. Low-frequency circularly polarized antennas and high-frequency circularly polarized antennas are used as array elements, and two groups of L-shaped direction-finding arrays are designed respectively to solve the problem of large size of the direction-finding array.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-standard mobile communication signal direction-finding antenna, characterized in that it includes a low-frequency antenna array for receiving 0.8GHz to 0.96GHz and a high-frequency antenna array for receiving 1.7GHz to 2.7GHz; the low-frequency antenna array includes a plurality of low-frequency circularly polarized antennas arranged in an L-shape on the same horizontal plane, the low-frequency circularly polarized antenna includes an upper microstrip antenna, a middle microstrip antenna, a bottom microstrip antenna, a feed network layer and a ground plate, the upper microstrip antenna includes an upper microstrip patch and an upper dielectric substrate, the upper microstrip patch has a cut corner and a center hole, The middle-layer microstrip antenna includes a middle-layer microstrip patch and a middle-layer dielectric substrate, wherein the middle-layer microstrip patch is arranged obliquely symmetrically; the bottom-layer microstrip antenna includes a bottom-layer dielectric substrate and a metal conductive strip etched on the bottom-layer dielectric substrate; the bottom-layer feeding network layer includes a feeding dielectric substrate and a feeding network circuit board, wherein the feeding network circuit board includes a Wilkinson power divider and a metal probe connected to the output port of the Wilkinson power divider; the high-frequency antenna array includes a plurality of high-frequency circularly polarized antennas arranged in an L shape on the same horizontal plane; the high-frequency circularly polarized antenna includes a first Vivaldi antenna array and a second Vivaldi antenna array that are orthogonal to each other.

[0008] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the first Vivaldi antenna array includes a first upper metal layer, a first lower ground layer, and a first dielectric layer arranged between the first upper metal layer and the first lower ground layer, the first dielectric layer is provided with a first microstrip feed line and a first metal patch connected to the first microstrip feed line, the first metal patch is bent to the two ends of the first dielectric layer and is perpendicular to the plane where the first dielectric layer is located; the second Vivaldi antenna array includes a second upper metal layer, a second lower ground layer, and a second dielectric layer arranged between the second upper metal layer and the second lower ground layer, the second dielectric layer is provided with a second microstrip feed line and a second metal patch connected to the second microstrip feed line, the second metal patch is bent to the two ends of the second dielectric layer and is perpendicular to the plane where the second dielectric layer is located, and the second dielectric layer is provided with a groove for inserting the first dielectric layer.

[0009] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the number of the low-frequency circularly polarized antennas is three, and the three low-frequency circularly polarized antennas are respectively located at three vertices of an isosceles triangle.

[0010] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the number of the high-frequency circularly polarized antennas is three, and the three high-frequency circularly polarized antennas are respectively located at three vertices of an isosceles triangle.

[0011] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the upper microstrip patch is square, the cut corners include two triangular cut corners respectively located at the two ends of a diagonal direction, and the center hole is a square hole located at the center position.

[0012] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: a connection hole compatible with the metal probe is opened in the center of the middle-layer microstrip patch, the middle-layer microstrip patches are of the same size, the number of the middle-layer microstrip patches is an even number, and the even number of the middle-layer microstrip patches are arranged in an oblique symmetrical manner.

[0013] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the number of the bottom dielectric substrates is four, the four bottom dielectric substrates are arranged to form a square groove, the four bottom dielectric substrates are rotationally symmetrical along the central axis of the square groove, and the square groove is respectively arranged vertically to the upper microstrip antenna, the middle microstrip antenna and the feed network layer.

[0014] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that the metal conductive strip is in a circular ring structure.

[0015] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that: the first upper metal layer and the second upper metal layer are respectively provided with a feeding structure, and the feeding structure includes a feeding network with a two-stage Wilkinson power divider.

[0016] The above-mentioned multi-standard mobile communication signal direction-finding antenna is characterized in that the end of the first microstrip feeder line is connected to a first circular stub.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The invention has a simple structure, reasonable design, and is easy to implement and operate.

[0019] 2. The present invention designs two circularly polarized antennas for use in the 0.8 GHz to 0.96 GHz and 1.7 GHz to 2.7 GHz frequency bands, respectively. Using these two circularly polarized antennas simultaneously can achieve full frequency band coverage.

[0020] 3. The present invention uses low-frequency circularly polarized antennas and high-frequency circularly polarized antennas as array elements, and designs two groups of L-shaped direction-finding arrays respectively. The high-frequency antenna array is arranged at the notch position of the L-shaped low-frequency antenna array, making full use of the idle space of the L-shaped array of low-frequency circularly polarized antenna to place the high-frequency circularly polarized antenna, effectively solving the problem of large size of the direction-finding array.

[0021] 4. The present invention improves the circular polarization characteristics of the low-frequency circular polarization antenna by cutting corners and opening holes in the upper microstrip patch; strengthens the coupling effect of the low-frequency circular polarization antenna by coupling feeding; realizes the miniaturization of the horizontal size of the low-frequency circular polarization antenna by loading circular ring branches; the Wilkinson power divider of the bottom feeding network layer ensures the integration of the antenna and has a good use effect.

[0022] 5. In the present invention, the first Vivaldi antenna array and the second Vivaldi antenna array are orthogonal to each other to form a high-frequency circularly polarized antenna, and the antenna cross-section is reduced by spatial folding. At the same time, the broadband characteristics of the Vivaldi antenna are fully utilized to reduce the horizontal size of the antenna.

[0023] 6. In the present invention, both ends of the first metal patch extend out of the first dielectric layer and are bent in opposite directions respectively, and the bent parts are bent toward the two sides of the first dielectric layer and are perpendicular to the plane where the first dielectric layer is located. By optimizing the layout method of the metal patch in the conventional Vivaldi antenna, the current distribution on the surface of the Vivaldi antenna is changed, and the gain and directivity of the high-frequency circularly polarized antenna are improved.

[0024] In summary, the present invention has a simple structure and a reasonable design. Two circularly polarized antennas are designed for use in the frequency bands of 0.8 GHz to 0.96 GHz and 1.7 GHz to 2.7 GHz, respectively. The use of these two circularly polarized antennas at the same time can achieve the effect of full-band coverage. Low-frequency circularly polarized antennas and high-frequency circularly polarized antennas are used as array elements, and two groups of L-shaped direction-finding arrays are designed respectively to solve the problem of large size of the direction-finding array.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the low-frequency circularly polarized antenna of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the upper microstrip antenna of the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the middle layer microstrip antenna of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the bottom layer microstrip antenna of the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the feeding network layer of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the high-frequency circularly polarized antenna of the present invention.

[0033] Figure 8 It is a schematic diagram of the structure of the first Vivaldi antenna array of the present invention.

[0034] Fig. 9 It is a schematic diagram of the structure of the second Vivaldi antenna array of the present invention.

[0035] Description of reference numerals:

[0036] 1—low frequency circular polarization antenna; 11—ground plate; 12—upper microstrip antenna;

[0037] 13—middle layer microstrip antenna; 14—bottom layer microstrip antenna; 15—feed network layer;

[0038] 2—high frequency circular polarization antenna; 21—first Vivaldi antenna array;

[0039] 22—second Vivaldi antenna element; 211—first dielectric layer;

[0040] 212—first lower ground layer; 213—first upper metal layer; 214—first metal patch;

[0041] 215—first circular stub; 216—first microstrip feed line; 221—second dielectric layer;

[0042] 222—second lower ground layer; 223—second upper metal layer; 224—second metal patch;

[0043] 225—second circular stub; 226—second microstrip feed line; 227—slot. DETAILED DESCRIPTION

[0044] The method of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] like Figures 1 to 9 As shown, the present invention includes a low-frequency antenna array for receiving 0.8 GHz to 0.96 GHz and a high-frequency antenna array for receiving 1.7 GHz to 2.7 GHz.

[0050] In actual use, the present invention designs two circularly polarized antennas for use in the 0.8GHz to 0.96GHz and 1.7GHz to 2.7GHz frequency bands, respectively. Using these two circularly polarized antennas simultaneously can achieve full frequency band coverage. The L-shaped antenna array has a simple structure and can simultaneously measure the azimuth and elevation angles of the incoming wave direction.

[0051] The low-frequency antenna array includes a plurality of low-frequency circularly polarized antennas 1 arranged in an L-shape on the same horizontal plane, and the high-frequency antenna array includes a plurality of high-frequency circularly polarized antennas 2 arranged in an L-shape on the same horizontal plane. The high-frequency antenna array is arranged at the notch position of the L-shape of the low-frequency antenna array. The low-frequency circularly polarized antenna and the high-frequency circularly polarized antenna are used as array elements, and two groups of L-shaped direction-finding arrays are designed respectively. The idle space of the L-shaped array of the low-frequency circularly polarized antenna is fully utilized to place the high-frequency circularly polarized antenna, saving space. The overall size of the direction-finding antenna is 290mm×270mm×300mm. This achieves the purpose of direction-finding for full-band mobile communication signals, and effectively solves the problem of large size and narrow bandwidth of the direction-finding array.

[0052] In actual use, there are three low-frequency circularly polarized antennas 1, and the three low-frequency circularly polarized antennas 1 are respectively located at the three vertices of an isosceles triangle. There are three high-frequency circularly polarized antennas 2, and the three high-frequency circularly polarized antennas 2 are respectively located at the three vertices of another isosceles triangle. In specific implementation, the above two isosceles triangles are both isosceles right triangles, and the hypotenuse perpendicular lines of the two isosceles right triangles are parallel or coincident.

[0053] The low-frequency circularly polarized antenna 1 comprises an upper microstrip antenna 12 , a middle microstrip antenna 13 , a bottom microstrip antenna 14 , a feed network layer 15 and a ground plane 11 .

[0054] In actual use, the size of the low-frequency circularly polarized antenna 1 is 0.22λ×0.22λ×0.09λ. Compared with other circularly polarized antennas, the low-frequency circularly polarized antenna 1 of the present invention has a smaller horizontal size and antenna profile. From the perspective of antenna design that takes into account both miniaturization and broadband, it has certain advantages.

[0055] The upper microstrip antenna 12 includes an upper microstrip patch and an upper dielectric substrate, wherein the upper microstrip patch has a cut corner and a center hole. The upper microstrip patch is square, wherein the cut corner includes two triangular cut corners located at both ends of a diagonal direction, and the center hole is a square hole located at the center. By using the cut corner opening method of the upper microstrip patch, the circular polarization characteristics of the low-frequency circularly polarized antenna 1 are improved.

[0056] The middle-layer microstrip antenna 13 includes a middle-layer microstrip patch and a middle-layer dielectric substrate, and the middle-layer microstrip patch is arranged obliquely symmetrically. A connection hole adapted to a metal probe is provided at the center of the middle-layer microstrip patch, and the middle-layer microstrip patches are of the same size, and the number of the middle-layer microstrip patches is an even number, and the even number of the middle-layer microstrip patches is arranged obliquely symmetrically. In actual use, the connection hole is a circular hole with a diameter of 1 mm. The coupling effect of the low-frequency circularly polarized antenna is enhanced by using the coupled feeding method, the impedance bandwidth of the low-frequency circularly polarized antenna is improved, and the gain of the low-frequency circularly polarized antenna is increased.

[0057] The bottom layer microstrip antenna 14 includes a bottom layer dielectric substrate and a metal conductive strip etched on the bottom layer dielectric substrate. The metal conductive strip is in a circular ring structure. There are four bottom layer dielectric substrates, and the four bottom layer dielectric substrates are arranged to form a square groove. The four bottom layer dielectric substrates are rotationally symmetrical along the central axis of the square groove. The square groove is respectively arranged vertically with the upper layer microstrip antenna 12, the middle layer microstrip antenna 13 and the feed network layer 15. In actual use, the miniaturization of the horizontal size of the low-frequency circularly polarized antenna is achieved by loading circular ring branches.

[0058] The bottom feed network layer 15 includes a feed dielectric substrate and a feed network circuit board. The feed network circuit board includes a Wilkinson power divider and a metal probe connected to the output port of the Wilkinson power divider. In actual use, the Wilkinson power divider is a single-stage Wilkinson power divider, which ensures the integration of the antenna. The microstrip line structure diagram of the Wilkinson power divider is shown in FIG. Figure 6 As shown, the microstrip line includes a wide microstrip line and a narrow microstrip line, wherein the line width of the wide microstrip line is 1.93 mm, and the line width of the narrow microstrip line is 1.02 mm. The resistance of the isolation resistor R is 100 Ω. In order to ensure that the output circuits of the output port A and the output port B are 90° out of phase, the distance from the output port A to the isolation resistor R is 46.6 mm longer than the distance from the output port B to the isolation resistor R. In order to improve the transmission characteristics, the microstrip line is cut corners, and the length of the cut corners is equal to the width of the microstrip line.

[0059] In actual use, the ground plate 11 is located on the upper side of the bottom feeding network layer 15 of the power divider, which can effectively reduce the influence of the feeding network circuit board on the antenna radiation characteristics. The ground plate 11 is arranged around the low-frequency circularly polarized antenna 1, which can play a reflective role and increase the gain of the antenna to a certain extent.

[0060] It should be noted that the upper dielectric substrate, the middle dielectric substrate, the bottom dielectric substrate and the feeding dielectric substrate are FR-4 dielectric substrates.

[0061] The high-frequency circularly polarized antenna 2 includes a first Vivaldi antenna array 21 and a second Vivaldi antenna array 22 which are orthogonal to each other. In actual use, the first Vivaldi antenna array 21 and the second Vivaldi antenna array 22 are orthogonal to each other to form a high-frequency circularly polarized antenna 2, wherein the structures of the first Vivaldi antenna array 21 and the second Vivaldi antenna array 22 are basically the same, and the first Vivaldi antenna array is rotated 90° along the central axis to form the second Vivaldi antenna array; the difference is that a slot 227 for inserting the first dielectric layer 211 is provided on the second dielectric layer 221 of the second Vivaldi antenna array. The spatial folding method is used to reduce the antenna cross-section, while fully utilizing the broadband characteristics of the Vivaldi antenna and reducing the horizontal size of the antenna.

[0062] In this embodiment, the first Vivaldi antenna element 21 includes a first upper metal layer 213, a first lower ground layer 212, and a first dielectric layer 211 arranged between the first upper metal layer 213 and the first lower ground layer 212. The first dielectric layer 211 is provided with a first microstrip feed line 216 and a first metal patch 214 connected to the first microstrip feed line 216. The first metal patch 214 is bent toward both ends of the first dielectric layer 211 and is perpendicular to the plane where the first dielectric layer 211 is located.

[0063] Both ends of the first metal patch 214 extend out of the first dielectric layer 211 and are bent in opposite directions. The bent portions are bent toward the two sides of the first dielectric layer 211 and are perpendicular to the plane where the first dielectric layer 211 is located. By optimizing the layout method of the metal patch in the conventional Vivaldi antenna, the current distribution on the surface of the Vivaldi antenna is changed, thereby improving the gain and directivity of the high-frequency circularly polarized antenna.

[0064] The first microstrip feed line 216 plays a role of feeding. In order to improve the matching relationship of the first microstrip feed line 216 , a first circular stub 215 is connected to the end of the first microstrip feed line 216 .

[0065] In this embodiment, the second Vivaldi antenna element 22 includes a second upper metal layer 223, a second lower ground layer 222, and a second dielectric layer 221 disposed between the second upper metal layer 223 and the second lower ground layer 222. The second dielectric layer 221 is provided with a second microstrip feed line 226 and a second metal patch 224 connected to the second microstrip feed line 226. The second metal patch 224 is bent toward both ends of the second dielectric layer 221 and is perpendicular to the plane where the second dielectric layer 221 is located. The second dielectric layer 221 is provided with a slot 227 for inserting the first dielectric layer 211. The first microstrip feed line 216 is connected to a first circular stub 215 at its end.

[0066] The second Vivaldi antenna array 22 has a substantially identical structure to the first Vivaldi antenna array 21. To achieve spatial orthogonality, a slot 227 is provided on the second dielectric layer 221 for inserting the first dielectric layer 211. The slot has a width of 1 mm. The other unexplained structures of the second Vivaldi antenna array 22 and the first Vivaldi antenna array 21 can adopt existing structures.

[0067] It should be noted that the first upper metal layer 213 and the second upper metal layer 223 are respectively provided with a feeding structure, and the feeding structure includes a feeding network having a two-stage Wilkinson power divider. The output port of the feeding structure on the first upper metal layer 213 is connected to the metal through hole on the first dielectric layer 211. The output port of the feeding structure on the second upper metal layer 223 is connected to the metal through hole on the second dielectric layer 221.

[0068] The first dielectric layer 211 and the second dielectric layer 221 are both FR-4 dielectric substrates or F4B-2 dielectric substrates.

[0069] The above description is only an embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A multi-standard mobile communication signal direction finding antenna, characterized in that: It includes a low-frequency antenna array for receiving 0.8 GHz to 0.96 GHz and a high-frequency antenna array for receiving 1.7 GHz to 2.7 GHz; The low-frequency antenna array comprises a plurality of low-frequency circularly polarized antennas (1) arranged in an L-shape on the same horizontal plane, the low-frequency circularly polarized antenna (1) comprising an upper microstrip antenna (12), a middle microstrip antenna (13), a bottom microstrip antenna (14), a feed network layer (15) and a ground plane (11), the upper microstrip antenna (12) comprising an upper microstrip patch and an upper dielectric substrate, the upper microstrip patch having a cut corner and a center hole, the middle microstrip antenna (13) comprising a middle microstrip patch and a middle dielectric substrate, the middle microstrip patch being arranged obliquely symmetrically, the bottom microstrip antenna (14) comprising a bottom dielectric substrate and a metal conductive strip etched on the bottom dielectric substrate, the bottom feed network layer (15) comprising a feed dielectric substrate and a feed network circuit board, the feed network circuit board comprising a Wilkinson power divider and a metal probe connected to an output port of the Wilkinson power divider; The high-frequency antenna array comprises a plurality of high-frequency circularly polarized antennas (2) arranged in an L-shape on the same horizontal plane; the high-frequency circularly polarized antenna (2) comprises a first Vivaldi antenna array (21) and a second Vivaldi antenna array (22) which are orthogonal to each other; The high-frequency antenna array is arranged at the notch position of the L-shaped low-frequency antenna array, and the high-frequency circularly polarized antenna is placed in the idle space of the L-shaped low-frequency circularly polarized antenna array; The first Vivaldi antenna element (21) comprises a first upper metal layer (213), a first lower ground layer (212), and a first dielectric layer (211) arranged between the first upper metal layer (213) and the first lower ground layer (212); the first dielectric layer (211) is provided with a first microstrip feed line (216) and a first metal patch (214) connected to the first microstrip feed line (216); the first metal patch (214) is bent toward two ends of the first dielectric layer (211) and is perpendicular to the plane where the first dielectric layer (211) is located; The second Vivaldi antenna element (22) comprises a second upper metal layer (223), a second lower ground layer (222), and a second dielectric layer (221) arranged between the second upper metal layer (223) and the second lower ground layer (222); the second dielectric layer (221) is provided with a second microstrip feed line (226) and a second metal patch (224) connected to the second microstrip feed line (226); the second metal patch (224) is bent toward two ends of the second dielectric layer (221) and is perpendicular to the plane where the second dielectric layer (221) is located; and the second dielectric layer (221) is provided with a groove (227) for inserting the first dielectric layer (211); The number of the low-frequency circularly polarized antennas (1) is three, and the three low-frequency circularly polarized antennas (1) are respectively located at three vertices of an isosceles triangle.

2. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The number of the high-frequency circularly polarized antennas (2) is three, and the three high-frequency circularly polarized antennas (2) are respectively located at three vertices of an isosceles triangle.

3. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The upper microstrip patch is square, the cut corners include two triangular cut corners respectively located at two ends of a diagonal direction, and the center hole is a square hole located at the center.

4. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: A connection hole adapted to a metal probe is provided at the center of the middle-layer microstrip patch. The middle-layer microstrip patches have the same size and are in an even number. The even-numbered middle-layer microstrip patches are arranged in an obliquely symmetrical manner.

5. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The number of the bottom dielectric substrates is four, the four bottom dielectric substrates are arranged to form a square groove, the four bottom dielectric substrates are rotationally symmetrical along the central axis of the square groove, and the square groove is respectively arranged vertically to the upper microstrip antenna (12), the middle microstrip antenna (13) and the feed network layer (15).

6. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The metal conductive band is in a circular ring structure.

7. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The first upper metal layer (213) and the second upper metal layer (223) are respectively provided with a feeding structure, wherein the feeding structure comprises a feeding network having a two-stage Wilkinson power divider.

8. A multi-standard mobile communication signal direction finding antenna according to claim 1, characterized in that: The end of the first microstrip feeding line (216) is connected to a first circular stub (215).

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