A low profile high integration broadband dual circularly polarized transceiving co-boresight phased array antenna

Abstract

The application discloses a low-profile high-integration broadband dual-circularly-polarized transmit-receive co-aperture phased array antenna, which adopts a multilayer PCB laminated structure and comprises, from top to bottom, a radiation patch layer, a quasi-rectangular patch layer, a metal reflecting ground layer and a feeding layer, and combines a metallized blind hole with a buried hole to form a complete coupling passage. By integrating a U-shaped groove, a U-shaped metal strip and a C-shaped groove in the metal reflecting ground and loading staggered grooves in the quasi-rectangular patch, a K / Ka dual-band separated double-coupling feeding structure is realized, so that dual-circularly-polarized radiation is obtained under the same aperture. The antenna further designs a metalized hole array of an outer ring and an inner ring, the former is used for building an isolation area to improve band isolation, and the latter introduces a horizontal electric field component to improve circular polarization purity and expand the axial ratio bandwidth. The application realizes wide impedance bandwidth and wide axial ratio bandwidth in the K band and the Ka band, has high isolation, low profile and compact structure, and is suitable for broadband phased array systems such as satellite communication terminals and mobile platforms.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of phased array antennas, and particularly relates to a low-profile high-integration wideband dual-circularly-polarized transceiving common-aperture phased array antenna. BACKGROUND

[0002] With the development and evolution of mobile communication, the demand for global interconnection is increasingly urgent. In densely populated areas such as cities, ground networks can well achieve signal coverage, but in the ocean or remote inland areas, ground base stations alone cannot achieve this, so satellite communication becomes an effective solution, which has broad market prospects and application value.

[0003] Millimeter wave active phased array can realize the connection and communication between ground terminal and satellite by using active phased array technology to quickly switch the direction of beam radiation. On the one hand, the K-band receiving array and the Ka-band transmitting array of the phased array are usually designed independently, which is expensive. With the progress of technology, the transceiving common-aperture phased array antenna can improve the system integration from the hardware level, effectively reduce the size of the array, and thus reduce the cost. On the other hand, circularly polarized antennas have more advantages than linearly polarized antennas in terms of combating multipath effects, rain attenuation and polarization mismatch, etc. Therefore, the research on K / Ka-band circularly polarized transceiving common-aperture phased array antenna has become an important topic and development direction of satellite phased array.

[0004] The existing K / Ka-band circularly polarized transceiving common-aperture phased array antenna is mainly realized by stacking or nesting low-frequency radiation elements with high-frequency radiation elements, and is mostly fed by probes. The realization of circular polarization relies on the phase input of wave control chips or 3dB bridges. The former increases the logical complexity of the system and reduces the reliability, while the latter increases the thickness of the antenna stack, which is not conducive to the thinning of the antenna array, resulting in one or more problems such as narrow impedance and axial ratio bandwidth, high profile or complex feed structure in the current K / Ka-band circularly polarized transceiving common-aperture phased array antenna. Therefore, it is necessary to propose a low-profile high-integration wideband dual-circularly-polarized transceiving common-aperture phased array antenna. SUMMARY

[0005] To solve the above technical problems, the application provides a low-profile high-integration wideband dual-circularly-polarized transceiving common-aperture phased array antenna, which can realize K / Ka-band transceiving antenna element common-aperture operation and dual-circularly-polarized characteristics with a relatively simple stack structure and a low profile, while increasing the antenna impedance and axial ratio bandwidth, and the structure is compact and has high integration.

[0006] Specifically, the technical scheme provided by the application is as follows:

[0007] A low-profile high-integration wideband dual-circularly-polarized transceiving common-aperture phased array antenna, comprising:

[0008] The first PCB substrate (1), the second PCB substrate (2) and the third PCB substrate (3) are sequentially arranged from top to bottom, and the upper surfaces of the first PCB substrate (1), the second PCB substrate (2) and the third PCB substrate (3) are respectively provided with a first metal layer (7), a second metal layer (8) and a third metal layer (9), and the lower surface of the third PCB substrate (3) is provided with a fourth metal layer (11);

[0009] The first PCB substrate (1) and the second PCB substrate (2) are provided with a first adhesive layer (4) therebetween, the second PCB substrate (2) and the third PCB substrate (3) are provided with a second adhesive layer (5) therebetween, and the third PCB substrate (3) is provided with a third adhesive layer (6) below and a fifth metal layer (13) on the lower surface of the third adhesive layer (6);

[0010] The first metal layer (7) and the second metal layer (8) are both radiation patches; the third metal layer (9) is a metal patch with a staggered slot (92) formed at the center thereof; the fourth metal layer (11) is a metal reflector with a U-shaped slot (111) formed at the center thereof, and a U-shaped metal strip (112) is arranged inside the U-shaped slot (111) and is bent along the U-shaped slot (111), and a boss formed by the U-shaped slot (111) extends into a semi-enclosed structure formed by the bending of the U-shaped metal strip (112), and the right side and the lower side of the metal reflector are respectively provided with C-shaped slots (113) opening outward; the third metal layer (9) and the fourth metal layer (11) are connected through a metallized hole array; the fifth metal layer (13) includes a high-frequency microstrip feed line and a low-frequency microstrip feed line, the high-frequency microstrip feed line is connected to the U-shaped metal strip (112) through a metallized hole, and the layout position of the low-frequency microstrip feed line corresponds to the C-shaped slot (113).

[0011] Further, the third metal layer (9) is a rectangular-like metal patch, and the upper left and lower right corners of the rectangular-like metal patch are provided with cut corners, and the staggered slot (92) formed at the center of the rectangular-like metal patch is a pair of slots staggered along the diagonal direction of the rectangular-like metal patch, the length of the slot in the upper left part of the staggered slot (92) is smaller than that of other parts, and the ends of the slots in the lower left, upper right and lower right parts of the staggered slot (92) are provided with cross branches.

[0012] Further, the opening direction of the U-shaped slot (111) of the fourth metal layer (11) corresponds to the shortest slot in the staggered slot (92), and the four corners of the U-shaped slot (111) are provided with cut corners, and the U-shaped metal strip (112) is bent to form a semi-enclosed structure of 270°.

[0013] Further, the metalized hole array comprises an outer ring metalized hole array (101) and an inner ring metalized hole array (102) composed of a plurality of metalized buried holes (10), the metalized buried holes in the outer ring metalized hole array (101) are distributed along the outer side of the U-shaped groove (111), and the metalized buried holes in the inner ring metalized hole array (102) are distributed along the inner side of the U-shaped metal strip (112).

[0014] Further, the high-frequency microstrip feed line comprises two high-frequency microstrip feed lines (131) respectively located on the left side and the upper side of the fifth metal layer (13) and symmetrically distributed along the diagonal line, one end of the high-frequency microstrip feed line (131) close to the edge of the fifth metal layer (13) is a high-frequency signal entering end, and the other end is connected with the end of the U-shaped metal strip (112) through the end-side metalized blind hole (121).

[0015] Further, the low-frequency microstrip feed line comprises two low-frequency T-shaped microstrip feed lines (132) respectively located on the right side and the lower side of the fifth metal layer (13) and symmetrically distributed along the diagonal line, the T-shaped staggered end of the low-frequency T-shaped microstrip feed line (132) is located on the inner side of the fifth metal layer (13), and one end of the low-frequency T-shaped microstrip feed line (132) close to the edge of the fifth metal layer (13) is a low-frequency signal entering end.

[0016] Preferably, the overall size of the antenna is 7.4 mm x 7.4 mm x 1.7 mm,

[0017] The material of the PCB substrate is Megtron 6.

[0018] Compared with the prior art, the application realizes a K / Ka-band dual-circularly polarized transceiving common-aperture antenna with low profile and few PCB stack numbers, has good impedance bandwidth, axial ratio bandwidth and isolation, has a compact overall structure, and has high integration.

[0019] 1. The separated dual-coupling feed structure formed by the U-shaped groove, the U-shaped metal strip, the staggered groove and the C-shaped groove, the low-profile stack structure of the multi-use of the reflecting ground, the radiator and the coupling structure is constructed, and the axial ratio improvement and isolation effect of the double-ring metalized hole array are utilized, so that the antenna as a whole can obtain good impedance bandwidth, axial ratio bandwidth and isolation, can realize K / Ka-band transceiving common-aperture operation under low profile and few PCB stack numbers, has a compact structure, high integration, and is suitable for millimeter wave phased arrays in satellite communication.

[0020] 2、The outer ring of metalized hole array is periodically distributed along the outer side of the U-shaped groove, and the inner ring of metalized hole array is periodically distributed along the inner side of the U-shaped metal strip, and the two are uniformly distributed in the left lower, right upper and right lower grooves of the staggered groove, the former constructs a zero electric field area, has an isolation effect on the separated double coupling feeding structure, so that the antenna has better isolation, and the latter can introduce a horizontal electric field component, reduce the influence of the vertical electric field component of the U-shaped metal strip on the internal electric field, thereby improving the circular polarization purity and improving the axial ratio performance, so the double ring of metalized hole array formed by the two has the beneficial effects of improving the axial ratio and isolation of the antenna.

[0021] 3、The upper left and lower right diagonal of the quasi-rectangular metal patch has a cut corner, which is a multiplexing structure. Firstly, the quasi-rectangular metal patch can produce left-handed / right-handed circularly polarized radiation as a K-band radiator under the coupling excitation of the lower C-shaped groove. Secondly, the quasi-rectangular metal patch is below the Ka-band rectangular radiation patch in the stack, so it can realize edge radiation as a reflection ground for the Ka-band rectangular radiation patch. Finally, the quasi-rectangular metal patch is loaded with a staggered groove at its center, which is located in the weak field area of the K-band radiation pattern and can construct a coupling horizontal rotating electric field for the Ka band. The two are relatively independent and support the co-aperture operation of the antenna.

[0022] 4、The metal reflection ground as the fourth metal layer of the PCB stack is a multiplexing structure. On the one hand, the metal reflection ground is located below the quasi-rectangular metal patch, so it can realize K-band edge radiation as a reflection ground for the quasi-rectangular metal patch. On the other hand, the metal reflection ground integrates structures such as U-shaped grooves, U-shaped metal strips and C-shaped grooves, constructs a separated K-band coupling excitation path and a Ka-band circular polarization switching excitation structure, and supports the co-aperture operation of the antenna.

[0023] 5、The high-frequency microstrip feed line, metalized blind hole, U-shaped metal strip and staggered groove form a Ka-band coupling excitation path, and the low-frequency T-shaped microstrip feed line and C-shaped groove form a K-band coupling excitation path. The two constitute a relatively independent separated double coupling feeding structure, which effectively expands the impedance matching bandwidth of the antenna through multiple transformations of the electric field pattern.

[0024] 6、The staggered groove is placed along the diagonal of the quasi-rectangular metal patch by a pair of mutually orthogonal grooves, wherein the length of the upper left groove is slightly shorter than that of the other grooves, and the ends of the left lower, right upper and right lower grooves have cross stubs, which can couple from the U-shaped metal strip to produce a horizontal rotating electric field with a phase difference of 90° and couple to excite the upper rectangular radiation patch to form Ka-band left-handed / right-handed circularly polarized radiation. In addition, the cross stub helps to reduce the length of the groove staggered along the diagonal of the quasi-rectangular metal patch, realizing the miniaturization of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the application, and do not limit the application.

[0026] Figure 1 is a schematic diagram of an antenna stack provided by an embodiment of the application;

[0027] Figure 2 is a schematic diagram of a first metal layer structure of an antenna provided by an embodiment of the application;

[0028] Figure 3 is a schematic diagram of a second metal layer structure of an antenna provided by an embodiment of the application;

[0029] Figure 4 is a schematic diagram of a third metal layer structure of an antenna provided by an embodiment of the application;

[0030] Figure 5 is a schematic diagram of a fourth metal layer structure of an antenna provided by an embodiment of the application;

[0031] Figure 6 is a schematic diagram of a fifth metal layer structure of an antenna provided by an embodiment of the application;

[0032] Figure 7 is a schematic diagram of an electric field distribution in a U-shaped metal strip provided by an embodiment of the application;

[0033] Figure 8 is a diagram of changes in an antenna axial ratio before and after loading an inner circle metallization hole array provided by an embodiment of the application;

[0034] Figure 9 is a simulation matching curve diagram of an antenna provided by an embodiment of the application;

[0035] Figure 10 is a simulation axial ratio curve diagram of an antenna provided by an embodiment of the application;

[0036] Figure 11 is a simulation same-frequency isolation curve diagram of an antenna provided by an embodiment of the application;

[0037] Figure 12 is a simulation different-frequency isolation curve diagram of an antenna provided by an embodiment of the application;

[0038] Figure 13 is a simulation gain curve diagram of an antenna provided by an embodiment of the application. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0040] This invention provides a low-profile, highly integrated broadband dual-circularly polarized transceiver phased array antenna, such as... Figure 1 As shown, the phased array antenna is mainly composed of a multilayer PCB substrate and an adhesive layer. In order from top to bottom, the first metal layer (7) is distributed on the first PCB substrate (1), the second metal layer (8) is distributed between the second PCB substrate (2) and the first adhesive layer (4), the third metal layer (9) is distributed between the third PCB substrate (3) and the second adhesive layer (5), the fourth metal layer (11) is distributed between the third PCB substrate (3) and the third adhesive layer (6), and the fifth metal layer (13) is distributed below the third adhesive layer (6). A metallized buried via (10) is provided between the third metal layer (9) and the fourth metal layer (11), and a metallized blind via (12) is provided between the fourth metal layer (11) and the fifth metal layer (13).

[0041] like Figure 2 As shown, the first metal layer (7) is a first rectangular radiating patch (71) distributed in the center.

[0042] like Figure 3 As shown, the second metal layer (8) is a second rectangular radiating patch (81) with a central distribution.

[0043] like Figure 4 As shown, the third metal layer (9) is a rectangular metal patch (91). The rectangular metal patch (91) has chamfered corners at the upper left and lower right corners, and a pair of intersecting grooves (92) at 90 degrees are loaded at the center. The grooves are distributed along the diagonal of the rectangular metal patch (91). The length of the upper left part of the intersecting groove (92) is slightly shorter than the rest. The ends of the lower left, upper right and lower right parts of the groove have intersecting branches.

[0044] like Figure 5As shown, the fourth metal layer (11) is a metal reflector with the same length and width as the PCB substrate and the adhesive layer, and a U-shaped slot (111) is loaded at the center, the opening direction of which is consistent with the shortest slot in the staggered slot (92), and the four corners of the U-shaped slot (111) also have a chamfered corner. The inside of the U-shaped slot (111) is provided with a 270° U-shaped metal strip (112) with the same opening direction as the U-shaped slot (111), and the metal boss formed by the U-shaped slot (111) extends into the U-shaped metal strip (112) by a certain length. On the right side and the lower side of the metal reflector, C-shaped slots (113) are symmetrically arranged along the diagonal, and the opening direction is outward.

[0045] As shown in Figure 6 , the fifth metal layer (13) includes a plurality of antenna feed lines, which are symmetrically distributed along the diagonal. The left side and the upper side are high-frequency microstrip feed lines (131), and the right side and the lower side are low-frequency T-shaped microstrip feed lines (132) with a length shorter than the high-frequency microstrip feed lines (131).

[0046] The interconnection distribution of the metalized holes is shown in Figure 1 and Figures 4-6 . For the metalized buried hole (10), there are two distribution modes, one of which is distributed along the outside of the U-shaped slot (111) to form an outer ring of metalized hole array (101), and the other of which is distributed along the inside of the U-shaped metal strip (112) to form an inner ring of metalized hole array (102), and the two are uniformly distributed between the left lower, right upper and right lower slots of the staggered slot (92). For the metalized blind hole (12), it is mainly used to connect the high-frequency microstrip feed line (131) and the U-shaped metal strip (112), so it is located at the end side of the two.

[0047] For the above-mentioned antenna, on the one hand, the signal enters from P1 / P2 of the low-frequency T-shaped microstrip feed line (132), propagates along the feed line, and excites the rectangular-like metal patch (91) with a chamfered corner through the coupling effect of the C-shaped slot (113), forming left-handed / right-handed circularly polarized radiation in the K band; on the other hand, the signal is fed from P3 / P4 of the high-frequency microstrip feed line (131), propagates along the feed line, and is transmitted to the U-shaped metal strip (112) through the end-side metalized blind hole (121) at the end side of the feed line and along it. Part of the signal excites the first rectangular radiation patch (71) and the second rectangular radiation patch (81) under the coupling effect of the staggered slot (92), forming left-handed / right-handed circularly polarized radiation in the Ka band, and finally realizing wideband dual-circularly-polarized transceiving co-antenna phased array antenna.

[0048] In the process, the U-shaped groove (111), the U-shaped metal strip (112), the staggered groove (92) and the pair of C-shaped grooves (113) form a split double coupling feed structure, and the outer ring of the metalized hole array (101) and the inner ring of the metalized hole array (102) form a double-ring metalized hole array, which plays a key role in expanding the impedance matching bandwidth and the axial ratio bandwidth of the antenna. Specifically, for the impedance matching bandwidth, during the process of signal transmission from the feed line to the radiator, due to the coupling effect of the staggered groove (92) and the C-shaped groove (113), the electric field undergoes multiple field pattern transformations, thus multiple resonance modes can be generated. Compared with the single resonance mode generated by direct probe excitation, the impedance matching bandwidth of the K / Ka band is effectively expanded, and the separation of the two coupling excitation structures is mainly realized by the outer ring of the metalized hole array (101) and the U-shaped groove (111); for the axial ratio bandwidth, first, during the signal transmission along the U-shaped metal strip (112), due to the 270° bending structure of the metal strip, the electric field distributed along the z-axis direction rotates, and the rotating electric field successively excites the staggered groove (92) above, so that the rotating electric field constituting the staggered groove (92) generates a 90° phase difference, and then couples and excites the uppermost stacked first rectangular radiation patch (71) and second rectangular radiation patch (81), so that left-handed / right-handed circular polarization can be realized. However, the electric field inside the U-shaped metal strip (112) is affected by the U-shaped metal strip (112) and the staggered groove (92), the former is distributed along the z-axis direction, and the latter is rotated along the x-axis / y-axis direction, resulting in a relatively chaotic electric field distribution inside the U-shaped metal strip (112), and the axial ratio bandwidth of the antenna is relatively narrow. Therefore, the inner ring of the metalized hole array (102) is added to regulate the electric field in this area. As shown in Figure 7 The addition of the periodic metalized hole introduces a new horizontal electric field component, effectively reducing the influence of the z-direction distributed electric field on the electric field inside the U-shaped metal strip (112), and improving the consistency of the periodic rotating horizontal electric field component in the central region, thereby improving the circular polarization purity of the antenna, i.e. the axial ratio level. Figure 8 The change of the antenna axial ratio before and after loading the inner ring of the metalized hole array (102) is shown, and it can be seen that the inner ring of the metalized hole array (102) has a significant improvement effect on the axial ratio bandwidth and the axial ratio level of the antenna.

[0049] In addition to widening the impedance matching bandwidth and axial ratio bandwidth of the antenna by the split double-coupled feed structure and the double-circle metallized hole array, another key point of the application is to multiplex the structure of the metal reflecting ground and the quasi-rectangular metal patch (91), so that the antenna can realize K / Ka band co-antenna working under low profile, compact structure and good isolation. Specifically, the metal reflecting ground not only realizes K band broadside radiation as the reflecting ground of the quasi-rectangular metal patch (91), but also integrates structures such as U-shaped groove (111), U-shaped metal strip (112) and C-shaped groove (113) to provide a metal carrier for the split double-coupled feed structure; and the quasi-rectangular metal patch (91) not only serves as an antenna radiator for the K band, but also serves as the reflecting ground of the first rectangular radiation patch (71) and the second rectangular radiation patch (81) to realize Ka band broadside radiation, and further integrates staggered grooves (92) in the central weak electric field region to avoid strong electromagnetic interference of the Ka band circularly polarized coupling structure on the K band radiator, thereby realizing good isolation. Therefore, the multiplexing of the multiple structures of the reflecting ground, the radiator and the coupling structure can effectively reduce the number of stacked layers required for the K / Ka band co-antenna coupling excitation, effectively reduce the overall profile height of the antenna, and maintain good isolation.

[0050] Under the action of the above working mechanism, the split double-coupled feed structure and the double-circle metallized hole array play a positive role in expanding the multi-mode bandwidth, the axial ratio bandwidth and the co-antenna working of the antenna, and through the multiplexing of the multiple structures of the reflecting ground, the radiator and the coupling structure, the antenna can not only realize K / Ka band co-antenna working under low profile, but also obtain good impedance bandwidth, axial ratio bandwidth and isolation, and the overall structure of the antenna is compact and has high integration, which is suitable for millimeter wave phased arrays in satellite communication.

[0051] A specific design example of the application is given below, and the antenna stack and the structure of each metal layer are shown in Figures 1-6 Specifically, the overall size of the antenna is 7.4 mm x 7.4 mm x 1.7 mm, and the PCB substrate is Megtron 6. The matching simulation results of the example are shown in Figure 9 As can be seen from the figure, the example realizes wideband operation, and the -10 dB matching bandwidth can reach 17.5~21.1 GHz and 25.1 GHz~35 GHz. The axial ratio simulation results are shown in Figure 10 As can be seen from the figure, the 3 dB axial ratio bandwidth is 19.2 GHz~20.5 GHz and 26.1 GHz~34.4 GHz. Figure 11 and Figure 12 are the simulation isolation curves of the antenna, and it can be seen that S 12 and S 34greater than 11 dB, S 13 and S 14 greater than 15 dB. Figure 13 The simulation gain curve of the antenna is shown in FIG. 6. The peak gain of K and Ka bands is 5.1 dBi.

[0052] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; under the idea of the present application, the technical features of the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low profile high integrated broadband dual circularly polarized transmit-receive co-boresight phased array antenna, characterized in that, The application relates to a PCB (printed circuit board) structure. The first PCB substrate (1) and the second PCB substrate (2) are provided with a first adhesive layer (4) therebetween, the second PCB substrate (2) and the third PCB substrate (3) are provided with a second adhesive layer (5) therebetween, and the third PCB substrate (3) is provided with a third adhesive layer (6) below and a fifth metal layer (13) on the lower surface of the third adhesive layer (6). The first metal layer (7) and the second metal layer (8) are both radiation patches; the third metal layer (9) is a metal patch and is provided with staggered grooves (92) in the center; the fourth metal layer (11) is a metal reflecting ground and is provided with a U-shaped groove (111) in the center, a U-shaped metal strip (112) is arranged in the U-shaped groove (111), a convex platform formed by the U-shaped groove (111) extends into a semi-enclosed structure formed by the U-shaped metal strip (112), and the right side and the lower side of the metal reflecting ground are respectively provided with C-shaped grooves (113) opening outward; the third metal layer (9) and the fourth metal layer (11) are connected through a metallized hole array; the fifth metal layer (13) comprises a high-frequency microstrip feed line and a low-frequency microstrip feed line, the high-frequency microstrip feed line is connected with the U-shaped metal strip (112) through a metallized hole, and the layout position of the low-frequency microstrip feed line corresponds to the C-shaped groove (113). The third metal layer (9) is a rectangular metal patch, the upper left and lower right corners of the rectangular metal patch are provided with cut corners, and the staggered grooves (92) in the center are a pair of grooves staggered along the diagonal direction of the rectangular metal patch, the groove length of the upper left part of the staggered grooves (92) is smaller than that of other parts, and the ends of the grooves of the lower left, upper right and lower right parts of the staggered grooves (92) are provided with cross branches.

2. The wideband dual-circular polarized co-feed phased array antenna of claim 1, wherein, The opening direction of the U-shaped groove (111) of the fourth metal layer (11) corresponds to the shortest groove in the staggered grooves (92), and the four corners of the U-shaped groove (111) are provided with cut corners, and the U-shaped metal strip (112) is bent to form a semi-enclosed structure of 270 degrees.

3. The wideband dual-circular polarized co-feed phased array antenna of claim 2, wherein, The metallized hole array comprises an outer ring metallized hole array (101) and an inner ring metallized hole array (102) composed of a plurality of metallized buried holes (10), the metallized buried holes in the outer ring metallized hole array (101) are distributed along the outer side of the U-shaped groove (111), and the metallized buried holes in the inner ring metallized hole array (102) are distributed along the inner side of the U-shaped metal strip (112).

4. The wideband dual-circular polarized co-feed phased array antenna of claim 1, wherein, ​ 5. The wideband dual-circular polarized co-feed phased array antenna of claim 1, wherein, The high-frequency microstrip feed line comprises two high-frequency microstrip feed lines (131) located on the left side and the upper side of the fifth metal layer (13) respectively and symmetrically distributed along the diagonal, one end of the high-frequency microstrip feed line (131) close to the edge of the fifth metal layer (13) being a high-frequency signal entering end, and the other end being connected with the end of the U-shaped metal strip (112) through the end side metallized blind hole (121).

6. The wideband dual-circular polarized co-feed phased array antenna of claim 1, wherein, The low-frequency microstrip feed line comprises two low-frequency T-shaped microstrip feed lines (132) located on the right side and the lower side of the fifth metal layer (13) respectively and symmetrically distributed along the diagonal, the T-shaped staggered end of the low-frequency T-shaped microstrip feed line (132) being located inside the fifth metal layer (13), one end of the low-frequency T-shaped microstrip feed line (132) close to the edge of the fifth metal layer (13) being a low-frequency signal entering end.

7. The wideband dual-circular polarized co-feed phased array antenna of claim 1, wherein, The overall size of the antenna is 7.4 mm*7.4 mm*1.7 mm, and the material of the PCB substrate is Megtron 6.

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