Circuit board, antenna assembly and dual-polarized antenna

Abstract

The present invention discloses a circuit board, an antenna assembly and a dual-polarized antenna. The circuit board includes a first dielectric layer, a feeder layer and a first metal layer. The feeder layer includes a horizontally polarized feeder, a vertically polarized feeder and a first connection line. The first connection line is used to divide the bottom surface of the first dielectric layer into two relatively independent regions, and the horizontally polarized feeder and the vertically polarized feeder are respectively arranged in the two regions. Horizontally polarized coupling slots and vertically polarized coupling slots are respectively arranged at positions on the first metal layer corresponding to the horizontally polarized feeder and the vertically polarized feeder, and the first metal layer is connected to the first connection line through a first metallization hole. The circuit board cooperates with an external isolation board to isolate the horizontally polarized feeder and the vertically polarized feeder, eliminate the electromagnetic coupling between the horizontally polarized feeder and the vertically polarized feeder, which is beneficial to improving the isolation degree of the dual-polarized antenna and reducing the cross-polarization component.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a circuit board, an antenna assembly, and a dual-polarized antenna. Background Art

[0002] In modern wireless communication systems, dual-polarized antennas, as a basic radiation unit, are widely used in base station antennas and phased array antennas to improve system performance.

[0003] For base station antennas, using polarization diversity technology is a way to reduce multipath loss. Since a dual-polarized antenna realizes the transceiver of two mutually orthogonal polarization component signals on one antenna, compared with the implementation method of using two antennas to transceiver signals respectively, the number of antennas is saved, thereby reducing the overall volume of the antenna and lowering the weight.

[0004] For dual-polarized antennas, in addition to the conventional antenna performance indicators, polarization isolation becomes an important indicator to measure the performance of a dual-polarized antenna, which directly affects the cross-polarization components of the two polarizations of the antenna, and this component can be represented by the performance indicator of cross-polarization discrimination rate. This indicator greatly increases the design difficulty of the antenna. Designing a dual-polarized antenna with high polarization isolation has become the focus of engineers' design.

[0005] In addition, for phased array antennas, since a large amount of heat is generated when the transceiver components are working, if this heat cannot be transferred away in time, the temperature of the transceiver components will become higher and higher. Excessive temperature will not only affect the performance of the transceiver components, but also accelerate the aging speed of each device and reduce the system life. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a circuit board that can improve the isolation of a dual-polarized antenna.

[0007] The present invention also provides an antenna assembly having the above circuit board.

[0008] The present invention also provides a dual-polarized antenna having the above antenna assembly.

[0009] A circuit board according to an embodiment of the first aspect of the present invention includes a first dielectric layer provided with a plurality of first metallization holes; a feeder layer provided on the bottom surface of the first dielectric layer, including a horizontally polarized feeder, a vertically polarized feeder, and a first connection line. The first connection line is used to divide the bottom surface of the first dielectric layer into two relatively independent regions. The horizontally polarized feeder and the vertically polarized feeder are respectively provided in the two regions. Connector mounting positions are respectively provided at the ends of the horizontally polarized feeder and the vertically polarized feeder; a first metal layer is provided on the surface of the first dielectric layer. Horizontal polarization coupling slits and vertical polarization coupling slits are respectively provided at positions on the first metal layer corresponding to the horizontally polarized feeder and the vertically polarized feeder. The first metal layer is connected to the first connection line through the first metallization holes.

[0010] The circuit board according to the embodiment of the present invention has at least the following beneficial effects:

[0011] This circuit board can be applied to a dual-polarized antenna. When in use, the circuit board cooperates with an external isolation board to isolate the horizontally polarized feeder and the vertically polarized feeder, eliminate the electromagnetic coupling between the horizontally polarized feeder and the vertically polarized feeder, which is beneficial to improving the isolation of the dual-polarized antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarized ports of the dual-polarized antenna highly consistent.

[0012] According to some embodiments of the present invention, the circuit board further includes a second dielectric layer provided on the surface of the first metal layer. The second dielectric layer is provided with a plurality of second metallization holes. A first metal sheet is provided on the upper surface of the second dielectric layer. A second connection line is provided around the first metal sheet. The second connection line is connected to the first metal layer through the second metallization holes.

[0013] An antenna assembly according to an embodiment of the second aspect of the present invention includes the circuit board according to the first aspect of the present invention; an isolation board provided at the bottom of the circuit board and connected to the first connection line. Two isolation regions are provided on the isolation board. The horizontally polarized feeder and the vertically polarized feeder are respectively located in the two isolation regions. Avoidance holes corresponding to the connector mounting positions are provided at the bottom of the isolation board.

[0014] The antenna assembly according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The antenna assembly can be applied to a dual-polarized antenna. The circuit board cooperates with the isolation board, which can isolate the horizontal polarization feeder and the vertical polarization feeder, eliminate the electromagnetic coupling between the horizontal polarization feeder and the vertical polarization feeder, is beneficial to improving the isolation of the dual-polarized antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarization ports of the dual-polarized antenna highly consistent.

[0016] According to some embodiments of the present invention, the isolation board is a metal plate, and two isolation cavities are provided on the metal plate, and the horizontal polarization feeder and the vertical polarization feeder are respectively located in the two isolation cavities.

[0017] According to some embodiments of the present invention, the isolation board is an isolation circuit board, and a plurality of third metallization holes are provided on the isolation circuit board. A third connection line corresponding to the first connection line is provided on the surface of the isolation circuit board, and the bottom surface of the isolation circuit board is a second metal layer, and the third connection line is connected to the second metal layer through the third metallization hole.

[0018] According to some embodiments of the present invention, the circuit board and the isolation circuit board are integrated on a PCB board.

[0019] The dual-polarized antenna according to the third aspect embodiment of the present invention includes an antenna assembly according to the second aspect embodiment of the present invention, and a horizontal polarization RF connector and a vertical polarization RF connector are installed; a metal fence is installed on the upper surface of the antenna assembly; an upper layer circuit board is installed on the upper surface of the metal fence.

[0020] The dual-polarized antenna according to the embodiment of the present invention has at least the following beneficial effects:

[0021] The circuit board cooperates with the isolation board, which can isolate the horizontal polarization feeder and the vertical polarization feeder, eliminate the electromagnetic coupling between the horizontal polarization feeder and the vertical polarization feeder, is beneficial to improving the isolation of the dual-polarized antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarization ports of the dual-polarized antenna highly consistent.

[0022] According to some embodiments of the present invention, the upper layer circuit board includes a third dielectric layer and a second metal sheet provided on the third dielectric layer.

[0023] According to some embodiments of the present invention, the antenna assembly, the metal fence and the upper layer circuit board are connected by gluing, riveting or fasteners.

[0024] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 One of the schematic diagrams of the stack decomposition of the circuit board according to an embodiment of the present invention;

[0027] Figure 2 One of the schematic diagrams of the stack decomposition of the circuit board according to an embodiment of the present invention;

[0028] Figure 3 The exploded view of the antenna assembly according to an embodiment of the present invention;

[0029] Figure 4 The schematic diagram of the stack decomposition of the isolation board of the antenna assembly according to an embodiment of the present invention;

[0030] Figure 5 The exploded view of the dual-polarization antenna according to an embodiment of the present invention;

[0031] Figure 6 The structural schematic diagram of the dual-polarization antenna according to an embodiment of the present invention;

[0032] Figure 7 The graph of the reflection coefficient and transmission coefficient of the dual-polarization antenna port according to an embodiment of the present invention;

[0033] Figure 8 The horizontal polarization gain pattern of the dual-polarization antenna according to an embodiment of the present invention;

[0034] Figure 9 The vertical polarization gain pattern of the dual-polarization antenna according to an embodiment of the present invention. Detailed implementation manners

[0035] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It 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 thus should not be construed as limiting the present invention.

[0037] In the description of the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceeding", etc. are understood not to include the recited number, and "above", "below", "within", etc. are understood to include the recited number. If the first and second are described only for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0039] Please refer to Figure 1 , this embodiment discloses a circuit board, including a first dielectric layer 110, a feeder layer 120 and a first metal layer 130. The first dielectric layer 110 is provided with a plurality of first metallization holes 111; the feeder layer 120 is disposed on the bottom surface of the first dielectric layer 110. The feeder layer 120 includes a horizontally polarized feeder 121, a vertically polarized feeder 122 and a first connection line 123. The first connection line 123 is used to divide the bottom surface of the first dielectric layer 110 into two relatively independent regions. The horizontally polarized feeder 121 and the vertically polarized feeder 122 are respectively disposed in the two regions, and corresponding connector mounting positions are respectively provided at the ends of the horizontally polarized feeder 121 and the vertically polarized feeder 122; the first metal layer 130 is disposed on the surface of the first dielectric layer 110, and horizontally polarized coupling slits 131 and vertically polarized coupling slits 132 are respectively provided at positions corresponding to the horizontally polarized feeder 121 and the vertically polarized feeder 122 on the first metal layer 130. The first metal layer 130 is connected to the first connection line 123 through the first metallization holes 111. During production and processing, the horizontally polarized coupling slits 131 and the vertically polarized coupling slits 132 can be formed by etching.

[0040] The circuit board 100 can be applied to a dual-polarized antenna. When in use, a horizontally polarized RF connector 124 and a vertically polarized RF connector 125 are respectively welded to the corresponding connector mounting positions. The plurality of first metallization holes 111 are arranged and combined, which is equivalent to the side wall of a metal cover. The cooperation between the first metallization holes 111 and the first metal layer 130 is equivalent to a metal cover. The circuit board 100 cooperates with the following isolation board to isolate the horizontally polarized feeder 121 and the vertically polarized feeder 122, eliminate the electromagnetic coupling between the horizontally polarized feeder 121 and the vertically polarized feeder 122, which is beneficial to improving the isolation of the dual-polarized antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarization ports of the dual-polarized antenna highly consistent.

[0041] Please refer to Figure 2, the circuit board 100 further includes a second dielectric layer 140 disposed on the surface of the first metal layer 130. A plurality of second metallization holes 141 are provided on the second dielectric layer 140. A first metal sheet 151 is provided on the upper surface of the second dielectric layer 140. A second connection line 152 is disposed around the first metal sheet 151. The second connection line 152 is connected to the first metal layer 130 through the second metallization hole 141. In use, the horizontal polarization RF connector 124 and the vertical polarization RF connector 125 are respectively welded to the corresponding connector mounting positions. An external signal is transmitted to the horizontal polarization part of the horizontal polarization feeder 121 through the horizontal polarization RF connector 124. The energy of the horizontal polarization feeder 121 is coupled to the first metal sheet 151 through the horizontal polarization coupling slot 131, and then radiated through the first metal sheet 151. Similarly, the external signal can be transmitted to the vertical polarization part of the vertical polarization feeder 122 through the vertical polarization RF connector 125 and radiate energy through the first metal sheet 151. The first connection line 123 and the first metallization hole 111 are used to connect the following isolation plate, and the second connection line 152 and the second metallization hole 141 are used to connect the following metal fence 300, so that the isolation plate and the metal fence 300 form a semi-closed cavity, thereby eliminating the surface wave of the dual-polarization antenna, reducing the backward radiation of the dual-polarization antenna, improving the front-to-back ratio, and further improving the gain of the dual-polarization antenna.

[0042] Please refer to Figure 3 , the antenna assembly according to the second aspect embodiment of the present invention includes the above-mentioned circuit board 100 and an isolation plate; the isolation plate is disposed at the bottom of the circuit board 100 and connected to the first connection line 123. Two isolation regions are provided on the isolation plate. The two isolation regions respectively correspond to the two regions separated by the first connection line 123. The horizontal polarization feeder 121 and the vertical polarization feeder 122 are respectively located in the two isolation regions. Avoidance holes 201 corresponding to the connector mounting positions are provided at the bottom of the isolation plate. The horizontal polarization RF connector 124 and the vertical polarization RF connector 125 respectively pass through the corresponding avoidance holes 201.

[0043] Please refer to Figure 2 and Figure 3 , the antenna assembly can be applied to a dual-polarization antenna. The circuit board 100 cooperates with the isolation plate to isolate the horizontal polarization feeder 121 and the vertical polarization feeder 122, eliminate the electromagnetic coupling between the horizontal polarization feeder 121 and the vertical polarization feeder 122, which is beneficial to improving the isolation of the dual-polarization antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarization ports of the dual-polarization antenna highly consistent.

[0044] Specifically, the isolation board is made of a metal plate 200, on which two isolation cavities 202 are provided. The horizontal polarization feeder 121 and the vertical polarization feeder 122 are respectively located in the two isolation cavities 202. The first connection line 123 and the first metallization hole 111 connect the isolation board and the first metal layer 130 to form two isolated cavities. Since the horizontal polarization feeder 121 and the vertical polarization feeder 122 are isolated, the signal energy is coupled through the horizontal coupling slot 131 and the vertical coupling slot 132 respectively. The feeding structure of the feeder and the coupling slot enables each polarization of the dual-polarized antenna to have a high polarization purity, thereby reducing the cross-polarization component and obtaining good radiation performance.

[0045] Please refer to Figure 4 , in addition to the metal plate, the isolation board can also adopt an isolation circuit board 210. A number of third metallization holes 211 are provided on the isolation circuit board 210. The surface of the isolation circuit board 210 is provided with a third connection line 212 corresponding to the first connection line 123. The bottom surface of the isolation circuit board 210 is the second metal layer 213. The third connection line 212 is connected to the second metal layer 213 through the third metallization holes 211. The third connection line 212 divides the surface of the isolation circuit board 210 into two relatively independent regions. The third connection line 212, the third metallization holes 211 and the second metal layer 213 form two isolation regions, which are functionally equivalent to the above isolation cavities 202. The horizontal polarization feeder 121 and the vertical polarization feeder 122 are respectively located in the two isolation regions. After the isolation board and the circuit board 100 are attached, the internal electromagnetic coupling between the two feeder networks can be eliminated, which is beneficial to improving the isolation of the dual-polarized antenna.

[0046] Furthermore, the circuit board 100 and the isolation circuit board 210 are integrated on a PCB board to achieve integrated setting, reducing the product volume and saving production costs.

[0047] Please refer to Figure 5 and Figure 6 , the dual-polarized antenna according to the third aspect embodiment of the present invention includes the above antenna assembly, a metal fence 300 and an upper circuit board 400. The antenna assembly is equipped with a horizontal polarization RF connector 124 and a vertical polarization RF connector 125; the metal fence 300 is installed on the upper surface of the antenna assembly. Specifically, the metal fence 300 is connected to the second connection line 152; the upper circuit board 400 is installed on the upper surface of the metal fence 300 shown.

[0048] The circuit board 100 cooperates with the isolation board, which can isolate the horizontally polarized feeder 121 and the vertically polarized feeder 122, eliminate the electromagnetic coupling between the horizontally polarized feeder 121 and the vertically polarized feeder 122, is beneficial to improving the isolation degree of the dual-polarized antenna, reducing the cross-polarization component, and making the reflection coefficients and gain patterns of the two polarization ports of the dual-polarized antenna highly consistent. The isolation board and the metal fence 300 can effectively reduce the backward radiation component of the dual-polarized antenna, thereby realizing semi-omnidirectional radiation. The heat on the circuit board 100 can be conducted to the metal fence 300 through the second metallized hole 141 and diffused through the metal fence 300, which is beneficial to improving the heat dissipation efficiency.

[0049] Please refer to Figure 5 , the upper-layer circuit board 400 includes a third dielectric layer 410 and a second metal sheet 420 disposed on the third dielectric layer 410. It should be noted that the second metal sheet 420 can be disposed on the surface or the bottom surface of the third dielectric layer 410. In this embodiment, the second metal sheet 420 is disposed on the bottom surface of the third dielectric layer 410, and the upper-layer circuit board 400 functions as an antenna cover. After assembly, the second metal sheet 420 is disposed inside the metal fence 300 to avoid contact with the external environment, which can effectively reduce the aging speed of the product. By adjusting the sizes of the first metal sheet 151 and the second metal sheet 420 and the sizes of the horizontally polarized coupling slot 131 and the vertically polarized coupling slot 132, the input impedances of the horizontal polarization and the vertical polarization of the dual-polarized antenna can be adjusted to achieve the purpose of impedance matching, thereby realizing a broadband antenna. There is an air dielectric between the first metal sheet 151 and the second metal sheet 420, making the dual-polarized antenna have a stacked microstrip antenna structure with an air layer, so that the dual-polarized antenna adds a resonance point, making the input impedance of the dual-polarized antenna become flat, which is beneficial to increasing the working bandwidth of the dual-polarized antenna.

[0050] The antenna assembly, the metal fence 300, and the upper-layer circuit board 400 are all relatively independent modules, with a simple assembly structure and high flexibility in use. During assembly, the antenna assembly, the metal fence 300, and the upper-layer circuit board 400 are assembled and fixed by means of gluing, riveting, or connection with fasteners 500. The fasteners 500 include screws, bolts, and pins. The metal fence 300 is also beneficial to improving the structural strength of the product, making the product more reliable and durable.

[0051] The following is a S-band dual-polarized antenna designed by the above solution:

[0052] 1. The thickness of the third dielectric layer 410 is 1.5 mm, the relative dielectric constant is 3.6, the length and width are both 50 mm, and the size of the second metal sheet 420 is 28 mm X 28 mm;

[0053] 2. The cross-sectional dimension of the metal fence 300 is 50 mm X 50 mm, and the height of the metal fence 300 is 10 mm;

[0054] 3. The thickness of the second dielectric layer 140 is 1.5 mm, the thickness of the first dielectric layer 110 is 0.8 mm. The relative dielectric constants of the first dielectric layer 110 and the second dielectric layer 140 are both 3.6. The length of the horizontally polarized coupling slot 131 is 17.7 mm, the maximum width is 3.8 mm. The length of the vertically polarized coupling slot 132 is 12.6 mm, the maximum width is 3.6 mm. The size of the first metal sheet 151 is 22 mm X 22 mm. The diameters of the first metallization hole 111 and the second metallization hole 141 are both 0.4 mm;

[0055] 4. The isolation plate is made of a metal plate, with a cross-sectional dimension of 50 mm X 50 mm, and the depth of the isolation cavity 202 is 3 mm.

[0056] Please refer to Figure 7 , Figure 7 which is the graph of the reflection coefficient and transmission coefficient of the S-band dual-polarized antenna ports. It can be seen from the graph that the operating bandwidths of the two polarization ports are relatively wide, where the horizontal polarization is 2.50 GHz to 3.14 GHz, and the vertical polarization is 2.50 GHz to 3.14 GHz. Within this operating frequency band, the transmission coefficient between the two polarization ports is mainly below -46 dB. Therefore, the polarization isolation of this S-band dual-polarized antenna reaches above 46 dB, and the antenna has a high port isolation.

[0057] Please refer to Figure 8 , Figure 8 which is the horizontally polarized gain pattern of the dual-polarized antenna. It can be seen from the graph that the horizontally polarized gain is higher than 6 dBi, and the cross-polarization component is less than -33 dBi, indicating that the cross-polarization discrimination rate of the horizontal polarization reaches above 39 dB.

[0058] Please refer to Figure 9 , Figure 9 which is the vertically polarized gain pattern of the dual-polarized antenna. It can be seen from the graph that the vertically polarized gain is higher than 6 dBi, and the cross-polarization component is less than -33 dBi, indicating that the cross-polarization discrimination rate of the vertical polarization reaches above 39 dB.

[0059] It should be noted that the port reflection coefficients and gain patterns of the two polarizations of the S-band dual-polarized antenna have a high degree of consistency, indicating that the antenna has good radiation performance and can be used as an array antenna element.

[0060] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can be made without departing from the gist of the present invention.

Claims

1. A dual-polarized antenna, characterized in that, It includes a circuit board (100), an isolation board, a metal fence (300), and an upper circuit board (400): The circuit board (100) includes: a first dielectric layer (110) provided with a plurality of first metallization holes (111); a feeder layer (120) disposed on the bottom surface of the first dielectric layer (110), including a horizontally polarized feeder (121), a vertically polarized feeder (122), and a first connection line (123). The first connection line (123) is used to divide the bottom surface of the first dielectric layer (110) into two relatively independent regions. The horizontally polarized feeder (121) and the vertically polarized feeder (122) are respectively disposed in the two regions. Connector mounting positions are respectively provided at the ends of the horizontally polarized feeder (121) and the vertically polarized feeder (122); a first metal layer (130) disposed on the upper surface of the first dielectric layer (110). Horizontally polarized coupling slots (131) and vertically polarized coupling slots (132) are respectively provided at positions on the first metal layer (130) corresponding to the horizontally polarized feeder (121) and the vertically polarized feeder (122). The first metal layer (130) is connected to the first connection line (123) through the first metallization holes (111); it further includes a second dielectric layer (140) disposed on the upper surface of the first metal layer (130). A plurality of second metallization holes (141) are provided on the second dielectric layer (140). A first metal sheet (151) is provided on the upper surface of the second dielectric layer (140). A second connection line (152) is provided on the periphery of the first metal sheet (151). The second connection line (152) is connected to the first metal layer (130) through the second metallization holes (141); The first connection line (123) and the first metallization holes (111) are used to connect the isolation board. The isolation board is used to isolate the horizontally polarized feeder (121) and the vertically polarized feeder (122). The second connection line (152) and the second metallization holes (141) are used to connect the metal fence (300) so that the isolation board and the metal fence (300) form a semi-closed cavity; The upper circuit board (400) is mounted on the upper surface of the metal fence (300).

2. The dual-polarized antenna according to claim 1, wherein It includes: An isolation board disposed at the bottom of the circuit board (100) and connected to the first connection line (123). Two isolation regions are provided on the isolation board. The horizontally polarized feeder (121) and the vertically polarized feeder (122) are respectively located in the two isolation regions. Avoidance holes (201) corresponding to the connector mounting positions are provided at the bottom of the isolation board.

3. The dual-polarized antenna according to claim 2, wherein The isolation board is a metal plate (200). Two isolation cavities (202) are provided on the metal plate (200). The horizontally polarized feeder (121) and the vertically polarized feeder (122) are respectively located in the two isolation cavities (202).

4. The dual-polarized antenna according to claim 2, characterized in that, The isolation board is an isolation circuit board (210). A plurality of third metallization holes (211) are provided on the isolation circuit board (210). A third connection line (212) corresponding to the first connection line (123) is provided on the surface of the isolation circuit board (210). The bottom surface of the isolation circuit board (210) is a second metal layer (213). The third connection line (212) is connected to the second metal layer (213) through the third metallization hole (211).

5. The dual-polarized antenna according to claim 4, characterized in that, The circuit board (100) and the isolation circuit board (210) are integrated on a PCB board.

6. The dual-polarized antenna according to any one of claims 2 to 5, characterized in that Including: A horizontal polarization RF connector (124) and a vertical polarization RF connector (125) are installed; The upper layer circuit board (400) includes a third dielectric layer (410) and a second metal sheet (420) provided on the third dielectric layer (410). An air dielectric exists between the first metal sheet (151) and the second metal sheet (420), so that the dual-polarization antenna has a stacked microstrip antenna structure with an air layer.

7. The dual-polarized antenna according to claim 6, wherein The metal fence (300) and the upper layer circuit board (400) are connected by adhesives or fasteners (500).

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