A low-profile, high-gain, co-aperture, broadband dual-polarization antenna

Abstract

The present invention discloses a low-profile, high-gain, co-aperture, broadband dual-polarization antenna, comprising a dual-port feed network, a first metal patch, a second metal patch, a dielectric substrate, a ground plate, and a metal cavity. The antenna has dual input ports, each of which feeds circularly polarized signals. Vertical polarization and circular polarization are generated by independent radiators. The radiators and feed ports of the two ports are perpendicular to each other in space to reduce coupling effects, achieve independent and complete radiation, and ultimately achieve different operating modes in the same frequency band at the two ports. The dual-port feed network and the first metal patch are both printed on one side of the dielectric substrate, and the ground plate is printed on the other side of the dielectric substrate. The metal cavity is positioned parallel to the dielectric substrate below, with a preset distance between the two. The present invention can reduce the complexity of antenna integration and improve antenna utilization efficiency while minimizing the impact between the different radiation modes of the two ports. The antenna can be widely used in relay communications and high-altitude detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas involved in wireless communications, and in particular relates to a low-profile, high-gain, common-aperture, broadband dual-polarization antenna. Background Art

[0002] With the rapid development of wireless communications in recent years, demand has increased for miniaturized antennas with high resource utilization and capacity. Due to the importance of wide operating bandwidth and high data rates in communication systems, dual-polarized antennas have been widely researched and used in wireless communication systems due to their remarkable advantages in increasing channel capacity and mitigating multipath fading and polarization mismatch between receivers and transmitters. Modern communication systems require a wide spectrum to cover more frequency bands, thus demanding the highest possible antenna bandwidth. This has led to increased interest in broadband dual-polarized antennas, leading to their widespread use.

[0003] With the improvement of resource utilization, the demand for large-capacity miniaturized antennas is increasing. However, most of the existing dual-polarization antenna designs have large and complex three-dimensional structures and cannot be applied to small devices. Therefore, it is very necessary to conduct research on low-profile miniaturized dual-polarization antennas.

[0004] In order to realize a miniaturized broadband antenna with relay communication function, a common-aperture broadband dual-polarization antenna with different polarizations was designed. The size was reduced through tight integration and combination, and broadband circular polarization in the same frequency band was achieved on the basis of linear polarization. Summary of the Invention

[0005] Based on the deficiencies of the existing technology, the technical problem solved by the present invention is to provide a common-aperture broadband dual-polarization antenna with simple structure, low profile, stable performance, broadband vertical polarization and circular polarization in the same frequency band, which can effectively reduce the complexity of antenna integration and improve antenna utilization efficiency, and can be widely used in relay communications and radar detection.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A low-profile, high-gain, co-aperture, broadband dual-polarization antenna comprises a dual-port feeding network with a T-junction, a first metal patch, a second metal patch, a dielectric substrate, a ground plate, and a metal cavity. The antenna as a whole has dual input ports, each of which feeds circularly polarized signals. Vertical polarization and circular polarization are generated by independent radiators. The radiators and feeding ports of the two ports are perpendicular to each other in space to reduce coupling effects, thereby achieving independent and complete radiation. Ultimately, the two ports achieve different operating modes in the same frequency band. The dual-port feeding network and the first metal patch are both printed on one side of the dielectric substrate, and the ground plate is printed on the other side of the dielectric substrate. The feeding network of port one uses a Wilkinson power divider and a phase shifter to form a T-junction, and the T-junction and multiple microstrip lines are sequentially connected to form a feeding network. The end of the microstrip line is parallel to the first metal patch, and close coupling is used to provide an input signal; the bottom of the metal cavity is square, and has periodically arranged square holes to form a reactive impedance surface, introducing resonance to generate phase advancement, and the metal cavity is located below the dielectric substrate and placed in parallel, with a preset distance between the two. The SMA connector of port two is located below the metal cavity, and the outer conductor is connected to the metal cavity so that it serves as a reflection cavity of one port and also as a ground for the two ports. The inner conductor of the connector extends upward through the metal cavity and connects to the second metal patch; the second metal patch has four 90° bent radiation arms, which are located below the dielectric substrate and between the metal cavity, and vertically pass through the dielectric substrate. The antenna operating frequency is adjusted by changing the length of the second metal patch radiation arm to make the operating frequencies of the two ports consistent.

[0008] In some embodiments, the shape of the grounding plate is formed by an elliptical groove in the center of the square plate, and curved corner cuts at the four corners of the square plate; the grounding plate as a whole is symmetrical about the Y axis; in order to change the direction of the current, a transverse groove is opened on the top of the long axis of the elliptical groove.

[0009] In some embodiments, the first metal patch is a square patch, and thin slits are provided along the diagonal lines at the two corners of the top of the square patch, and two symmetrical ports of the dual-port feeding network are parallel to the same side of the patch. Each feeding point is located at a corner of the square and is placed relative to each other to couple and feed the patch.

[0010] In some embodiments, the second metal patch is a metal patch with cross-shaped branches, which is composed of a cocentric circle and a ring. The diameter of the circle is smaller than the ring, and there is a certain gap between the two. The branches are perpendicular to each other with the rectangular coordinate axis as the reference direction.

[0011] In some embodiments, the branches of the two metal patches are 1 / 4λ long and 0.8mm wide, with the ends widened to 3mm and bent upward at 90° to pass through the upper dielectric substrate.

[0012] In some embodiments, the metal cavity is surrounded by vertically upward baffles, which together with the bottom form a cavity, and the size of the periodically arranged grooves at the bottom of the metal cavity is 4 mm×4 mm.

[0013] In some embodiments, when port one is working, the metal cavity acts as a reflection unit to improve the directionality of radiation from one port. The grid can be regarded as a parallel LC resonant tank, ensuring that the capacitance characteristics presented by the metal mesh at the bottom of the cavity can effectively shorten the distance between the radiator and the reflector. When port two is working, the metal cavity acts as a ground and combines with the second metal patch to form linear polarization with omnidirectional radiation.

[0014] In some embodiments, the dual-port feeding network includes a wide microstrip line and a narrow microstrip line; the wide microstrip line is connected to the feeding port in a manner parallel to the Y-axis, and the narrow microstrip line is symmetrical about the Y-axis. The narrow microstrip line consists of two short narrow microstrip lines located below and parallel to the bottom edge of the first metal patch and arranged at intervals, a long narrow microstrip line located below and parallel to the short narrow microstrip line, and two bent microstrip lines with a 90-degree angle connected to the short narrow microstrip line and the long narrow microstrip line.

[0015] In some embodiments, the SMA feeding connector is welded to the metal cavity below the dielectric substrate through a square flange, and its inner conductor passes through the metal cavity and is connected to the second metal patch.

[0016] In some embodiments, the dielectric substrate is made of F4BM220 material, has a length and width of 35 mm, a thickness of 0.762 mm, and a relative dielectric constant of 2.2.

[0017] Beneficial effects of the present invention:

[0018] A T-shaped dual-port feeding network is used to provide equal-amplitude signals with a certain phase difference. By coupling the same square patch structure, good impedance bandwidth and circularly polarized radiation characteristics are achieved, with the advantages of miniaturization and large bandwidth.

[0019] By loading the annular groove floor, circular polarization radiation characteristics are achieved and the circular polarization axial ratio bandwidth of the present invention is expanded, with the advantage of low profile.

[0020] The coaxial feeding through the mesh metal cavity below provides omnidirectional vertical polarization, creating conditions for the relay platform.

[0021] This co-aperture broadband dual-polarized antenna is manufactured based on the F4BM220 dielectric substrate. The metal mesh cavity structure below improves the antenna gain while maintaining the circular polarization bandwidth. The co-centered circular ring and circular patch with upward-bending cross-shaped branches provide broadband linear polarization, with the advantages of simple manufacturing and stable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0023] In the attached figure:

[0024] Figure 1 This is a three-dimensional structural diagram of the common-aperture broadband dual-polarization antenna of the present invention;

[0025] Figure 2 This is a structural diagram of the ground plate of the present invention;

[0026] Figure 3 A three-dimensional diagram of the mesh metal cavity of the present invention;

[0027] Figure 4 A three-dimensional diagram of a metal patch with cross-shaped branches according to the present invention;

[0028] Figure 5 This is a plan view of the co-aperture broadband dual-polarization antenna of the present invention;

[0029] Figure 6 Partial plan view of the co-aperture broadband dual-polarization antenna of the present invention (a is a front view, b is a back view, and c is a schematic diagram of the arrangement of the mesh metal cavity and the metal patch with cross-shaped branches);

[0030] Figure 7 The surface current direction of the common-aperture broadband dual-polarization antenna of the present invention changes within a time period;

[0031] Figure 8 A return loss curve diagram of the common-aperture broadband dual-polarization antenna of the present invention;

[0032] Figure 9 1 is an axial ratio curve diagram of the common-aperture broadband dual-polarization antenna of the present invention;

[0033] Figure 10 These are the radiation patterns of the two ports of the co-aperture broadband dual-polarization antenna of the present invention.

[0034] Figure identification: 1-dual-port feeding network, 11-wide microstrip line, 12-short narrow microstrip line, 13-long narrow microstrip line, 14-bent microstrip line; 2-first metal patch, 21-slit; 3-second metal patch, 31-circle, 32-ring, 33-branch; 4-dielectric substrate; 5-ground plate, 51-elliptical groove, 52-transverse groove; 6-metal cavity, 61-baffle, 62-groove.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. Implementation Method

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] like Figure 1 、 Figure 5 、 Figure 6 As shown, a low-profile, high-gain, co-aperture, broadband dual-polarization antenna comprises a T-junction dual-port feeding network 1, a first metal patch 2, a second metal patch 3, a dielectric substrate 4, a ground plate 5, and a metal cavity 6. The antenna as a whole has dual input ports, each of which feeds circularly polarized signals. Vertical polarization and circular polarization are generated by independent radiators. The radiators and feeding ports of the two ports are perpendicular to each other in space to reduce coupling effects, achieve independent and complete radiation, and ultimately achieve different working modes in the same frequency band at the two ports. The dual-port feeding network 1 and the first metal patch 2 are both printed on one side of the dielectric substrate 4, and the ground plate 5 is printed on the other side of the dielectric substrate 4. The feeding network of port one uses a Wilkinson power divider and a phase shifter to form a T-junction. The T-junction and multiple microstrip lines are connected in sequence to form a feeding network. The end of the microstrip line is parallel to the first metal patch, and close coupling is used to provide input signals.

[0038] The bottom of the metal cavity 6 is square, with periodically arranged square holes forming a reactive impedance surface, which introduces resonance to produce phase advancement. The metal cavity 6 is placed parallel to the dielectric substrate 4 below, and the two are separated by a preset distance. The SMA connector of port 2 is located below the metal cavity 6. The outer conductor is connected to the metal cavity 6, so that it serves as a reflection cavity at one port and also as a ground for the second port. The inner conductor of the connector passes through the metal cavity 6 and extends upward to connect to the second metal patch 3.

[0039] The second metal patch 3 has four 90° bent radiation arms, which are located below the dielectric substrate 4 and between the metal cavity 6, and vertically pass through the dielectric substrate 4. The antenna operating frequency is adjusted by changing the length of the second metal patch radiation arm so that the operating frequencies of the two ports are consistent.

[0040] A preferred embodiment of the ground plate of the above embodiment is given below:

[0041] like Figure 2 、 Figure 6As shown, the shape of the grounding plate 5 is formed by an elliptical groove 51 at the center of the square plate, and curved corner cuts at the four corners of the square plate; the grounding plate 5 is symmetrical about the Y axis as a whole; in order to change the direction of the current, a transverse groove 52 is opened at the top of the long axis of the elliptical groove 51.

[0042] In a preferred embodiment, the original square dimensions of the ground plate 5 are 35 mm in side length. The major axis radius of the elliptical slot 51 is 13.75 mm, the minor axis radius is 12.7 mm, and the upper transverse slot 52 is 1.1 mm wide and 12.6 mm long. It should be noted that the dimensions of the ground plate are not limited to the above dimensions. These dimensions are merely a preferred embodiment and can be adjusted accordingly in actual use based on design requirements.

[0043] A preferred embodiment of the first metal patch in the above embodiment is given below:

[0044] The first metal patch 2 is a square patch, and a fine slit 21 is provided along the diagonal at the two corners of the top of the square patch. The two symmetrical ports of the dual-port feeding network 1 are parallel to the same side of the patch. Each feeding point is located at a corner of the square, and the patches are placed relative to each other for coupling and feeding.

[0045] Preferred embodiment: The first metal patch 2 is square with a side length of 10.6 mm, a diagonal slit width of 0.5 mm, a length of 5 mm, and a coupling distance of 1 mm between the first metal patch and the dual-port feed network port 1. It should be noted that the size of the first metal patch is not limited to the dimensions listed above. The dimensions given above are merely a preferred embodiment and can be adjusted accordingly in actual use based on design requirements.

[0046] A preferred embodiment of the second metal patch in the above embodiment is given below:

[0047] like Figure 4 As shown, the second metal patch 3 is a cross-shaped patch consisting of a concentric circle 31 and ring 32. The diameter of circle 31 is smaller than that of ring 32, with a certain gap between them. Branches 33 are arranged perpendicular to each other with the rectangular coordinate axis as the reference direction. Branches 33 are 1 / 4λ long and 0.8mm wide. The ends of the branches widen to 3mm and bend upward 90° to pass through the upper dielectric substrate 4.

[0048] The preferred solution is: the central circle has a radius of 3.8mm, the inner diameter of the ring is 4.5mm, and the outer diameter is 5.7mm. The cross-shaped branches are 10.5mm long and 0.8mm wide, and the upward bend at the end is 8.5mm long and 3mm wide. It should be noted that the size of the second metal patch is not limited to the above dimensions. The dimensions given above are only for reference and can be adjusted accordingly in actual use according to design requirements.

[0049] A preferred embodiment of the above embodiment regarding the mesh metal cavity is given below:

[0050] like Figure 3 As shown, metal cavity 6 is surrounded by vertical baffles 61, and its bottom is defined by parallel slots 62. When port one is operating, metal cavity 6 acts as a reflector, improving the directivity of radiation from that port. The mesh can be considered a parallel LC resonant tank, ensuring that the capacitance characteristics of the metal mesh at the bottom of the cavity effectively shorten the distance between the radiator and the reflector. When port two is operating, metal cavity 6 acts as a ground, combining with the second metal patch to form linear polarization with omnidirectional radiation.

[0051] A preferred solution: A 44mm x 44mm metal structure is surrounded by 5mm-high baffles and has parallel 4mm x 4mm slots at its bottom. The metal patch is spaced 1.8mm apart from the cross-shaped branches and placed below the dielectric substrate. The bottom of the metal cavity is 7.7mm away from the dielectric substrate. It should be noted that the size of the metal cavity is not limited to the dimensions listed above. These dimensions are merely a preferred embodiment and can be adjusted accordingly in practice based on design requirements.

[0052] A preferred embodiment of the above embodiment regarding a dual-port feeding network is given below:

[0053] The dual-port feeding network 1 includes a wide microstrip line 11 and a narrow microstrip line; the wide microstrip line 11 is connected to the feeding port in a manner parallel to the Y axis, and the narrow microstrip line is symmetrical about the Y axis. The narrow microstrip line consists of two short narrow microstrip lines 12 located below and parallel to the bottom edge of the first metal patch 2 and arranged at intervals, a long narrow microstrip line 13 located below and parallel to the short narrow microstrip line 12, and two bent microstrip lines 14 at a 90-degree angle connected to the short narrow microstrip line 12 and the long narrow microstrip line 13.

[0054] The preferred solution: The length and width of the wide microstrip line are 4.24 mm and 2.7 mm, respectively. The length and width of the short narrow microstrip line are 0.74 mm and 0.68 mm, respectively. The length and width of the long narrow microstrip line are 10.94 mm and 0.68 mm, respectively. The length of the bent microstrip line is 9.28 mm and 11.59 mm, and the width is 0.68 mm. This effectively shortens the microstrip line length and simplifies the feed network structure. It should be noted that the size of the two-port feed network is not limited to the dimensions listed above. The dimensions given above are only a preferred embodiment and can be adjusted accordingly in actual use according to design requirements.

[0055] A further solution is that the SMA feeding connector is welded to the metal cavity below the dielectric substrate through a square flange, and its inner conductor passes through the metal cavity and is connected to the patch with a cross-shaped branch.

[0056] Further solution: Dielectric substrate 4 is made of F4BM220 material, has a length and width of 35 mm, a thickness of 0.762 mm, and a relative dielectric constant of 2.2. It should be noted that the size of the dielectric substrate is not limited to the dimensions listed above. The dimensions given above are merely a preferred embodiment and can be adjusted accordingly in actual use based on design requirements.

[0057] As can be seen from the above, the present invention discloses a common-aperture broadband dual-polarization antenna with vertical polarization and circular polarization for a relay communication system, comprising a dielectric substrate, a feed network with dual input ports, a square patch with a 45° slanted slot, a circular bilaterally symmetrical ground plate, a metal patch with a cross-shaped upwardly bent branch composed of a circle and a ring with a common center, and a metal mesh with square holes, wherein the feed network and the square patch are both printed on one surface of the dielectric substrate, and the circular ground plate is printed on the other surface of the dielectric substrate, wherein the feed network The network is connected by multiple sections of microstrip transmission lines, and the microstrip line is coupled to the patch to feed the wide circular polarization bandwidth; the other port SMA feed connector is welded to the center of the metal patch with a cross-shaped branch through a metal mesh. The metal patch with a cross-shaped branch is located below the dielectric substrate, and the end is widened and bent upward 90°. Combined with the circle and ring with the same center, it achieves good impedance matching in the same frequency band. A mesh metal cavity is placed under the metal patch with a cross-shaped branch, which serves as a two-port grounding while improving the directionality and high gain of one port. The present invention is mainly used in fields such as high-altitude relay communications and has the advantages of common interface, same-frequency dual polarization, wide circular polarization axis ratio, and low profile.

[0058] In order to further illustrate the superior performance of the antenna with dual-polarization characteristics of the present invention, HFSS software is used to simulate the characteristics of various parts of the antenna.

[0059] like Figure 7As shown, the surface current distribution of the antenna of the present invention at different cycle times at 6 GHz is shown. It can be seen that as time goes by, the current distribution on the feeding network rotates counterclockwise, indicating that the antenna has circularly polarized radiation characteristics.

[0060] like Figure 8 As shown, the bandwidth of the two-port common impedance of the present invention is 5.3-7.45 GHz, which well covers the application frequency bands of relay communication and radar detection.

[0061] like Figure 9 As shown, it can be seen that when the port 1 of the present invention is in effect, the axial ratio bandwidth of circular polarization is 5.3-7.45 GHz.

[0062] like Figure 10 As shown in the figure, the dual-port radiation pattern of the present invention at frequencies of 6.5 GHz and 7.4 GHz is shown. It can be seen from the figure that the antenna has good circularly polarized radiation characteristics when port one is working, and omnidirectional radiation when port two is working. It can be seen from the figure that the gain of port one can reach up to 8.2 dB, and the gain of port two can reach up to 6 dB.

[0063] The above results show that the co-aperture broadband dual-polarized antenna of the present invention has a common impedance bandwidth of 5.4-7.45 GHz and an axial ratio bandwidth of 5.3-7.45 GHz. It realizes the circular polarization characteristics of the antenna in the form of a low profile and has high gain within the operating frequency band. The port two impedance bandwidth is 5.3-7.5 GHz and has stable omnidirectional characteristics. Therefore, the present invention has the advantages of miniaturization, low profile, large axial ratio bandwidth and stable dual-polarization operating characteristics, and is expected to be widely used in fields such as relay communications.

[0064] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0065] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A low-profile, high-gain, co-aperture, broadband dual-polarization antenna, characterized by: The invention comprises a two-port feeding network having a T-junction, a first metal patch, a second metal patch, a dielectric substrate, a ground plate and a metal cavity; The antenna has dual input ports, each feeding circularly polarized signals. Vertical polarization and circular polarization are generated by independent radiators. The radiators and feed ports of the two ports are perpendicular to each other in space to reduce coupling effects and achieve independent and complete radiation. Ultimately, the two ports achieve different operating modes in the same frequency band. The dual-port feeding network and the first metal patch are both printed on one side of the dielectric substrate, and the ground plate is printed on the other side of the dielectric substrate. The feeding network of port one uses a Wilkinson power divider and a phase shifter to form a T-junction. The T-junction and multiple microstrip lines are sequentially connected to form a feeding network. The ends of the microstrip lines are parallel to the first metal patch, and close coupling is used to provide input signals. The bottom of the metal cavity is square, with periodically arranged square holes forming a reactive impedance surface, which introduces resonance to generate phase advancement. The metal cavity is placed parallel to the dielectric substrate below the dielectric substrate, and the two are separated by a preset distance. The SMA connector of port two is located below the metal cavity. The outer conductor is connected to the metal cavity, so that it serves as a reflection cavity at one port and also as a ground for the second port. The inner conductor of the connector extends upward through the metal cavity to connect to the second metal patch. The second metal patch has four 90° bent radiating arms, which are located below the dielectric substrate and between the metal cavity and vertically pass through the dielectric substrate. The antenna operating frequency is adjusted by changing the length of the second metal patch radiating arms so that the operating frequencies of the two ports are consistent. The shape of the grounding plate is formed by an elliptical groove at the center of the square plate and curved corner cuts at the four corners of the square plate; the grounding plate is symmetrical about the Y axis as a whole; in order to change the direction of the current, a transverse groove is opened on the top of the long axis of the elliptical groove.

2. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The first metal patch is a square patch, with fine slits along the diagonal lines at the two corners of the top of the square patch, and two symmetrical ports of the dual-port feeding network are parallel to the same side of the patch. Each feeding point is located at a corner of the square and is placed relative to each other to couple and feed the patches.

3. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The second metal patch is a metal patch with cross-shaped branches, which is composed of a cocentric circle and a ring. The diameter of the circle is smaller than the ring, and there is a certain gap between the two. The branches are perpendicular to each other with the rectangular coordinate axis as the reference direction.

4. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 3, characterized in that: The branches of the two metal patches are 1 / 4λ long and 0.8mm wide, with the ends widened to 3mm and bent upward at 90° to pass through the upper dielectric substrate.

5. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The metal cavity is surrounded by vertically upward baffles, which together with the bottom form a cavity. The size of the periodically arranged grooves at the bottom of the metal cavity is 4mm×4mm.

6. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 5, characterized in that: When port one is working, the metal cavity acts as a reflection unit to improve the directionality of radiation from one port. The grid can be regarded as a parallel LC resonant tank, ensuring that the capacitance characteristics presented by the metal mesh at the bottom of the cavity can effectively shorten the distance between the radiator and the reflector. When port two is working, the metal cavity acts as a ground and combines with the second metal patch to form linear polarization with omnidirectional radiation.

7. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The dual-port feeding network includes a wide microstrip line and a narrow microstrip line; The wide microstrip line is connected to the feeding port in a manner parallel to the Y axis, and the narrow microstrip line is symmetrical about the Y axis. The narrow microstrip line consists of two short narrow microstrip lines located below and parallel to the bottom edge of the first metal patch and arranged at intervals, a long narrow microstrip line located below and parallel to the short narrow microstrip line, and two bent microstrip lines with a 90-degree angle connected to the short narrow microstrip line and the long narrow microstrip line.

8. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The SMA feeding connector is welded to the metal cavity below the dielectric substrate through a square flange, and its inner conductor passes through the metal cavity and is connected to the second metal patch.

9. The low-profile, high-gain, co-aperture, broadband dual-polarization antenna according to claim 1, characterized in that: The dielectric substrate is made of F4BM220 material, has a length and width of 35 mm, a thickness of 0.762 mm, and a relative dielectric constant of 2.2.

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