Low-profile multimode resonance broadband dual-polarization metasurface antenna

Abstract

The invention relates to a low-profile multimode resonance broadband dual-polarization metasurface antenna which is composed of three layers of dielectric substrates and a copper-clad layer. The main body part of the antenna is composed of a three-layer dielectric substrate, a radiation patch, a slotted gap surface layer, a feed microstrip line and a jumper wire layer. The radiation patch, the slotted slot surface, the feed microstrip line and the jumper wire are sequentially arranged on the copper-clad layers from top to bottom; the microstrip lines are orthogonally arranged, and are prevented from crossing in the same layer by bridging jumper wires, so that the isolation degree is improved; in a working state, radiation in different polarization directions can be realized by feeding the microstrip lines in different polarization directions. The method can meet the application requirements of radars, satellite communication, communication base stations and the like.

Description

Technical Field

[0001] This invention belongs to the field of communication technology, and further relates to a metasurface antenna design with low profile broadband dual-polarized radiation in the field of electromagnetic field and microwave technology, which can be used in radar and base station applications. Background Technology

[0002] With the development of modern radar and satellite communications, the demand for wide-bandwidth antennas is increasing. Dual-polarized antennas, due to their ability to improve spectral efficiency, can significantly enhance radar sensitivity. However, dual-polarized microstrip antennas have the inherent disadvantage of narrow bandwidth. In recent years, with the introduction of metasurface antennas, their advantages of low profile, easy conformal design, and wide bandwidth have attracted widespread attention.

[0003] In recent years, numerous designs have been proposed for broadbanding metasurface antennas. The first approach introduces additional slot modes to extend bandwidth. For slot-excited metasurface antennas, the slot modes are analyzed, and a method using slot arrays and dual H-type broadband feeds is proposed to introduce additional slot modes and extend bandwidth. The second approach extends the -reflection coefficient bandwidth and axial ratio bandwidth by using aperture-coupled CPW feeds and modifying the metasurface dimensions. The third approach, based on introducing an air layer to load a double-layer metasurface, allows for the introduction of an additional layer of metasurface operating characteristics, representing an effective way to extend the metasurface bandwidth, achieving bandwidth increases of over 60%. Characteristic mode theory is considered an effective method for designing metasurface antennas and a powerful tool for analyzing their radiation properties and field distribution. Much research has been conducted on achieving broadbanding, circular polarization, and pattern shaping. The method of introducing higher-order modes of the metasurface based on mode modulation is widely used, fully utilizing the multi-mode characteristics of the metasurface. Although the multimode characteristics of metasurface antennas provide significant diversity and performance improvement, higher-order modes often have some drawbacks, such as difficulty in excitation and pattern splitting, as well as a large frequency gap with the main mode. To fully utilize their multimode characteristics, these drawbacks must be overcome, thus posing a significant challenge to mode modulation, suppression, and degradation. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention proposes a low-profile multimode resonant broadband dual-polarized metasurface antenna. Based on characteristic mode analysis, it reshapes the mode current of higher-order modes by modulating patch size, cutting, and adding parasitic patches, thereby simultaneously exciting five higher-order modes and achieving five-mode resonance. It achieves wide bandwidth, high isolation, and high gain in a low profile, demonstrating its great potential in radar and satellite communication fields.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A low-profile multimode resonant broadband dual-polarized metasurface antenna includes a metasurface radiating patch, an upper dielectric substrate, a slotted grounding gap copper layer, a middle dielectric substrate, a double Y-type orthogonal microstrip line copper layer, a lower dielectric substrate, and a bridging microstrip line copper layer arranged sequentially. The double Y-type orthogonal microstrip line copper cladding layer and the bridging microstrip line copper cladding layer are connected through metallized vias that penetrate the underlying dielectric substrate to avoid the double Y-type orthogonal microstrip line copper cladding layers crossing on the same layer. In the working state, the two sets of microstrip lines of the double Y-type orthogonal microstrip line copper cladding layer are fed separately to realize the dual polarization excitation of the metasurface radiation patch, thereby realizing dual polarization radiation.

[0006] In one embodiment, the metasurface radiation patch comprises: A square main radiating patch is located in the center; Four rectangular radiating patches are located on one side of the four sides of the square main radiating patch, and are rotationally symmetrical about the center of the square main radiating patch; Four quadrature parasitic patches are located on one side of the four corners of the square main radiating patch and are rotationally symmetrical about the center of the square main radiating patch. The quadrature parasitic patches are cut from a square patch along two axes of symmetry of the four sides.

[0007] In one embodiment, the metasurface radiation patch further includes: Four first rectangular parasitic patches are located on one side of an outer edge of a quadrangularly divided parasitic patch, and are rotationally symmetrical about the center of the square main radiating patch; Four second rectangular parasitic patches are located on one side of the other outer edge of the four-part parasitic patch, and are rotationally symmetrical about the center of the square main radiating patch.

[0008] In one embodiment, the slotted grounding gap copper cladding layer is a square structure with a cross-shaped slot in the center, and the center of the cross-shaped slot is opposite to the center projection of the metasurface radiating patch.

[0009] In one embodiment, the dual Y-type orthogonal microstrip line copper cladding layer includes a Y-type horizontally polarized feed microstrip line and a Y-type vertically polarized feed microstrip line; wherein the vertically polarized feed microstrip line is disconnected at the position where it intersects with the horizontally polarized feed microstrip line, and is connected by jumper wires in the bridging microstrip line copper cladding layer through the metallized via.

[0010] Compared with the prior art, the beneficial effects of the present invention are: First, because the radiating patch design in this invention uses characteristic mode modulation to expand the bandwidth, the bandwidth of the antenna is expanded by tuning and merging the multiple resonant modes inherent in the metasurface antenna itself. The main radiating patch provides a pair of resonant modes, the rectangular radiating patches on the side provide two pairs of resonant modes, the parasitic patches around the perimeter provide a pair of resonant modes, and the cross-shaped slot of the slotted ground plane used for feeding provides a resonant mode. The modification of the antenna is done on a single copper layer, which has a much lower profile than the double-layer stacked metasurface, making it suitable for conformal design. At the same time, because it merges all the first four degenerate modes of the 3*3 metasurface antenna and introduces the higher-order modes of the slot, the bandwidth is the widest among 3*3 metasurface antennas.

[0011] Secondly, since the present invention takes into account the directionality of the radiation mode in the control of the resonant mode, the current mode of the higher-order mode of the radiation pattern lobes is suppressed to varying degrees. The size ratio of the main radiation patch to the side rectangular radiation patch eliminates the lobes of a pair of radiation modes. The presence of parasitic patches around the perimeter also eliminates the lobes of a pair of radiation modes. Therefore, the present invention has good lobe suppression during in-band radiation and will not cause interference due to the presence of side lobes.

[0012] Third, because the microstrip line feed layer in this invention uses jumpers to avoid signal crossing on the same layer, the two polarization directions achieve extremely high isolation, so that this invention will not receive its own emitted signals and cause interference when operating in horizontal and vertical polarization. Attached Figure Description

[0013] Figure 1 This is an exploded view of the overall structure of the low-profile multimode resonant broadband dual-polarized metasurface antenna and the copper-clad layer structure of the dielectric substrate of the present invention.

[0014] Figure 2 This is a schematic diagram of the metasurface radiation patch structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the copper-clad layer structure of the slotted grounding gap surface of the present invention.

[0016] Figure 4 This is a schematic diagram of the double Y-type orthogonal microstrip line copper cladding layer of the present invention.

[0017] Figure 5 This is a schematic diagram showing the connection between the double Y-type orthogonal microstrip line copper cladding layer and the bridging microstrip line copper cladding layer of the present invention through a metallized via on the underlying dielectric substrate.

[0018] Figure 6 This is a schematic diagram of the lower dielectric substrate and its metallized vias.

[0019] Figure 7 This is an S-parameter curve obtained from antenna modeling and simulation in an embodiment of the present invention. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings and examples.

[0021] Reference Figures 1 to 6 The low-profile multimode resonant broadband dual-polarized metasurface antenna of the present invention will be described in further detail below.

[0022] In this embodiment of the invention, the low-profile multimode resonant broadband dual-polarized metasurface antenna is mainly composed of three dielectric substrates and four copper cladding layers; specifically, it includes, from top to bottom, a metasurface radiating patch 1, an upper dielectric substrate 2, a slotted grounding gap copper cladding layer 3, a middle dielectric substrate 4, a double Y-shaped orthogonal microstrip line copper cladding layer 5, a lower dielectric substrate 6, and a bridging microstrip line copper cladding layer 7.

[0023] In one embodiment of the present invention, a metasurface radiating patch 1 is printed on the upper surface of the upper dielectric substrate 2, a slotted grounding gap copper layer 3 is printed on the lower surface of the upper dielectric substrate 2, and a double Y-shaped orthogonal microstrip line copper layer 5 is printed on the lower surface of the middle dielectric substrate 4. The orthogonally placed microstrip lines provide power to the metasurface radiating patch 1 in two polarization directions. A bridging microstrip line copper layer 7 is printed on the lower surface of the lower dielectric substrate 6. The upper dielectric substrate 2 is a dielectric substrate with a thickness of 1 mm, a dielectric constant of 2.2, and a loss tangent of 0.0009. The middle dielectric substrate 4 and the lower dielectric substrate 6 are both dielectric substrates with a thickness of 0.127 mm, a dielectric constant of 6.15, and a loss tangent of 0.0019. The dimensions of each dielectric substrate are 35 mm × 35 mm.

[0024] The double Y-type orthogonal microstrip line copper cladding layer 5 and the bridging microstrip line copper cladding layer 7 are connected by a metallized via 61 that penetrates the underlying dielectric substrate 6 to avoid the double Y-type orthogonal microstrip line copper cladding layers 5 crossing on the same layer and improve isolation. In the working state, the two sets of microstrip lines of the double Y-type orthogonal microstrip line copper cladding layer 5 are fed separately to realize the dual polarization excitation of the metasurface radiating patch 1, thereby realizing radiation in different polarization directions, which can meet the needs of applications such as radar, satellite communication, and communication base stations.

[0025] Furthermore, referring to Figure 2 As shown, the metasurface radiating patch 1 includes a square main radiating patch 11, four rotationally symmetrical rectangular radiating patches 12, four rotationally symmetrical quadrature parasitic patches 13, four rotationally symmetrical first rectangular parasitic patches 14, and four rotationally symmetrical second rectangular parasitic patches 15. It is easy to understand that the square main radiating patch 11 is located at the center, and the term "rotationally symmetrical" refers to rotational symmetry about its center.

[0026] Specifically, four rectangular radiating patches 12 are located on one side of each of the four sides of the square main radiating patch 11, with two arranged horizontally and two vertically. Four quadrature parasitic patches 13 are located on one side of each of the four corners of the square main radiating patch 11. Each quadrature parasitic patch 13 has two outer sides and two inner sides. An inner side refers to the side adjacent to a rectangular radiating patch 12, and outer sides refer to the sides other than the inner sides. Four first rectangular parasitic patches 14 are located on one side of one outer side of each quadrature parasitic patch 13, with two arranged horizontally and two vertically. Four second rectangular parasitic patches 15 are located on the other outer side of each quadrature parasitic patch 13, with two arranged horizontally and two vertically.

[0027] In this invention, the square main radiating patch 11 provides a resonant mode and is directly fed by the feed slot, feeding the other radiating patches and parasitic patches through capacitive coupling between the patches. Four rectangular radiating patches 12 are placed around the main radiating patch, providing two pairs of resonant modes: a resonant mode along the long side and a resonant mode along the short side. The quadrature parasitic patch 13 is formed by cutting a square patch along two axes of symmetry of the four sides. The cutting of the patch ensures that there is no mode current on the quadrature parasitic patch 13, thereby suppressing the distribution of mode current on the four rectangular radiating patches 12 and the square main radiating patch. Four first rectangular parasitic patches 14 and four second rectangular parasitic patches 15 are placed diagonally on the metasurface antenna. Their function is to guide the current of the full-wave resonant mode originally distributed on the four rectangular radiating patches 12 to the parasitic patch, thereby suppressing its pattern lobes.

[0028] Furthermore, referring to Figure 3 As shown, the slotted grounding gap copper cladding layer 3 is a square structure with a cross-shaped slot 31 in the center. Obviously, the center of the cross-shaped slot 31 must be aligned with the center projection of the metasurface radiating patch 1 in order to achieve better antenna performance.

[0029] One size design, the square main radiating patch 11 has a size of L. S ×L S =7mm×7mm, the size of the rectangular radiating patch 12 is L. S ×L p2 =7mm×6.35mm, the size of the parasitic patch 13 cut into four equal parts is L p3 ×L p3 =6mm×6mm, the dimensions of the first rectangular parasitic patch 14 and the second rectangular parasitic patch 15 are both L. p4 ×L p4=5.2mm×5.2mm. The spacing between the square main radiating patch 11, the rectangular radiating patch 12, and the quadrature parasitic patch 13 is 0.3mm, and the cutting width of the quadrature parasitic patch 13 is 0.2mm. The spacing between the quadrature parasitic patch 13, the first rectangular parasitic patch 14, and the second rectangular parasitic patch 15 is 0.05mm. The dimensions of the cross-shaped slot 31 of the copper cladding layer 3 on the slotted grounding gap surface are 8.5mm×0.4mm.

[0030] Furthermore, referring to Figure 4 As shown, the dual Y-type orthogonal microstrip line copper cladding layer 5 includes a Y-type horizontally polarized feed microstrip line 51 and a Y-type vertically polarized feed microstrip line 52, which respectively excite horizontal polarization and vertical polarization. The two microstrip lines are placed orthogonally to excite the two polarization directions. The vertically polarized feed microstrip line 52 is disconnected at the intersection with the horizontally polarized microstrip line 51 to avoid contact on the same layer, and is connected by a jumper in the bridging microstrip line copper cladding layer 7 through a metallized via 61.

[0031] Furthermore, the horizontally polarized fed microstrip line 51 consists of a first microstrip line 511, two second microstrip lines 512, two third microstrip lines 513, and two fourth microstrip lines 514. The two fourth microstrip lines 514 are arranged in parallel and symmetrically. One end of one third microstrip line 513 is connected to one end of one fourth microstrip line 514, and the other end is connected to one end of the first microstrip line 511 through a second microstrip line 512, thereby forming a Y-shaped structure. The width of the third microstrip line 513 is smaller than the width of the fourth microstrip line 514.

[0032] Correspondingly, the vertically polarized fed microstrip line 52 consists of a fifth microstrip line 521, two sixth microstrip lines 522, two seventh microstrip lines 523, two eighth microstrip lines 524, and two ninth microstrip lines 525. The two eighth microstrip lines 524 are arranged in parallel and symmetrically, and the two ninth microstrip lines 525 are arranged in parallel and symmetrically. The two ninth microstrip lines 525 are located between the two fourth microstrip lines 514, and the two eighth microstrip lines 524 are located outside the fourth microstrip lines 514. One end of a seventh microstrip line 523 is connected to one end of an eighth microstrip line 524, and the other end is connected to one end of a fifth microstrip line 521 through a sixth microstrip line 522, thus forming a Y-shaped structure. The width of the seventh microstrip line 523 is smaller than the width of the eighth microstrip lines 524 and the ninth microstrip lines 525.

[0033] Furthermore, referring to Figure 5 As shown, the copper cladding layer 7 bridging the microstrip line includes four microstrip line segments 71. Further, referring to... Figure 6As shown, there are three pairs of metallized vias 61. Two microstrip line segments 71 are used to connect an eighth microstrip line 524 and a ninth microstrip line 525 across a fourth microstrip line 514 through the two pairs of metallized vias 61. The other two microstrip line segments 71 are used to extend two ninth microstrip lines 525 across another fourth microstrip line 514 through the remaining pair of metallized vias 61. The connection and extension make the horizontally polarized feed microstrip line 51 and the vertically polarized feed microstrip line 52 have the same length.

[0034] Furthermore, the linewidth of microstrip segment 71 is the same as that of the eighth microstrip line 524 and the ninth microstrip line 525.

[0035] In one dimensional design, the lengths of the first microstrip line 511, the second microstrip line 512, the third microstrip line 513, and the fourth microstrip line 514 in a horizontally polarized microstrip line are respectively: L 511 =0.91mm, L 512 =2mm, L 513 =1.44mm, L 514 =7.8mm. In the vertically polarized microstrip lines, the lengths of the fifth microstrip line 521, the sixth microstrip line 522, the seventh microstrip line 523, the eighth microstrip line 524, and the ninth microstrip line 525 are respectively: L 521 =0.91mm, L 522 =2mm, L 523 =1.44mm, L 524 =3.2mm, L 525 =3.6mm. The width of each microstrip line is divided into a 50-ohm impedance matching end with a width W1 = 0.24mm, and a 70.7-ohm quarter-wavelength impedance transformation segment with a width W2 = 0.09mm. Specifically, the widths of the first microstrip line 511, the second microstrip line 512, the third microstrip line 513, and the fourth microstrip line 514 are 0.24mm, 0.09mm, 0.09mm, and 0.24mm, respectively; the widths of the fifth microstrip line 521, the sixth microstrip line 522, the seventh microstrip line 523, the eighth microstrip line 524, and the ninth microstrip line 525 are 0.24mm, 0.09mm, 0.09mm, 0.24mm, and 0.24mm, respectively. Correspondingly, the length of microstrip line segment 71 is the same as the break length of the vertically polarized feed microstrip line 52, specifically, its length L5 = 0.64mm and its width W2 = 0.24mm.

[0036] Furthermore, the present invention provides a circular aperture with a radius slightly larger than that of the metallized via 61 at the connection between the vertically polarized feed microstrip line 52 and the microstrip line segment 71, the aperture having a coincident axis and a radius R = 0.15 mm.

[0037] Based on the above structure, the present invention can operate in vertical polarization, horizontal polarization, oblique polarization, and circular polarization based on the feeding phase of the dual-polarized microstrip line.

[0038] The technical effects of the present invention will be further explained below with reference to simulation experiments: The S-parameter curves obtained by modeling and simulating the antenna of the designed size in the embodiment of the present invention using the commercial simulation software Ansys HFSS are shown below. Figure 7 As shown. Figure 7 The horizontal axis represents the frequency value in GHz, and the vertical axis represents the S-parameter in dB. Figure 7 The black square symbol in the solid line represents the vertical polarization transmission coefficient |S 22 |The curve, the solid black circle symbol, represents the horizontal polarization transmission coefficient|S 11 |, The black dashed line represents the horizontal-vertical polarization isolation |S 21 |. It can be seen that the embodiments of the present invention have |S in the broadband range of 9.77-14.62GHz (40%). 11 |Below -10dB, with |S| in the 9.78-14.63GHz (40%) broadband range 22 |Transmission coefficient below -10dB, while in-band |S 21 The difference of less than -30dB demonstrates that the antenna possesses broadband radiation and dual-polarized high isolation characteristics. Simultaneously, the antenna's total thickness represents an extremely low profile of 0.05 times the wavelength.

[0039] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A low-profile multimode resonant broadband dual-polarized metasurface antenna, characterized in that, The structure includes, in sequence, a metasurface radiating patch (1), an upper dielectric substrate (2), a slotted grounding gap copper cladding layer (3), a middle dielectric substrate (4), a double Y-shaped orthogonal microstrip line copper cladding layer (5), a lower dielectric substrate (6), and a bridging microstrip line copper cladding layer (7). The double Y-type orthogonal microstrip copper layer (5) and the bridging microstrip copper layer (7) are connected through a metallized via (61) that penetrates the lower dielectric substrate (6) to avoid the double Y-type orthogonal microstrip copper layer (5) crossing on the same layer. In the working state, the two sets of microstrip lines of the double Y-type orthogonal microstrip copper layer (5) are fed respectively to realize the dual polarization excitation of the metasurface radiation patch (1) and thus realize dual polarization radiation.

2. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 1, characterized in that, The metasurface radiation patch (1) includes: A square main radiating patch (11) is located in the center; Four rectangular radiating patches (12) are located on one side of the four sides of the square main radiating patch (11), and are rotationally symmetrical about the center of the square main radiating patch (11); Four quadrature parasitic patches (13) are located on one side of the four corners of the square main radiating patch (11) and are rotationally symmetrical about the center of the square main radiating patch (11). The quadrature parasitic patches (13) are cut from a square patch along two axes of symmetry of the four sides.

3. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 2, characterized in that, The metasurface radiation patch (1) also includes: Four first rectangular parasitic patches (14) are located on one side of one outer edge of the four-part parasitic patch (13), and are rotationally symmetrical about the center of the square main radiating patch (11); Four second rectangular parasitic patches (15) are located on one side of the other outer edge of the four-part parasitic patch (13), and are rotationally symmetrical about the center of the square main radiating patch (11).

4. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 3, characterized in that, The slotted grounding gap surface copper cladding layer (3) is a square structure with a cross-shaped gap (31) in the center. The center of the cross-shaped gap (31) is opposite to the center projection of the metasurface radiation patch (1).

5. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 4, characterized in that, The square main radiating patch (11) has a size of 7mm×7mm, the rectangular radiating patch (12) has a size of 7mm×6.35mm, the quadrature parasitic patch (13) has a size of 6mm×6mm, the first rectangular parasitic patch (14) and the second rectangular parasitic patch (15) both have a size of 5.2mm×5.2mm, the spacing between the square main radiating patch (11) and the rectangular radiating patch (12) and the quadrature parasitic patch (13) is 0.3mm, the cutting width of the quadrature parasitic patch (13) is 0.2mm, and the spacing between the quadrature parasitic patch (13) and the first rectangular parasitic patch (14) and the second rectangular parasitic patch (15) is 0.05mm; the cross gap (31) of the slotted grounding gap copper layer (3) has a size of 8.5mm×0.4mm.

6. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to any one of claims 1 to 5, characterized in that, The dual Y-type orthogonal microstrip line copper cladding layer (5) includes a Y-type horizontally polarized feed microstrip line (51) and a Y-type vertically polarized feed microstrip line (52); wherein the vertically polarized feed microstrip line (52) is disconnected at the position where it intersects with the horizontally polarized feed microstrip line (51), and is connected to the crossover microstrip line copper cladding layer (7) through the metallized via (61).

7. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 6, characterized in that, The horizontally polarized fed microstrip line (51) consists of a first microstrip line (511), two second microstrip lines (512), two third microstrip lines (513), and two fourth microstrip lines (514); The two fourth microstrip lines (514) are arranged in parallel and symmetrically. One end of a third microstrip line (513) is connected to one end of a fourth microstrip line (514), and the other end is connected to one end of a first microstrip line (511) through a second microstrip line (512), thereby forming a Y-shaped structure. The width of the third microstrip line (513) is smaller than the width of the fourth microstrip line (514). The vertically polarized fed microstrip line (52) consists of a fifth microstrip line (521), two sixth microstrip lines (522), two seventh microstrip lines (523), two eighth microstrip lines (524), and two ninth microstrip lines (525); The two eighth microstrip lines (524) are arranged in parallel and symmetrically, and the two ninth microstrip lines (525) are arranged in parallel and symmetrically. The two ninth microstrip lines (525) are located between the two fourth microstrip lines (514), and the two eighth microstrip lines (524) are located outside the fourth microstrip lines (514). One end of a seventh microstrip line (523) is connected to one end of an eighth microstrip line (524), and the other end is connected to one end of a fifth microstrip line (521) through a sixth microstrip line (522), thereby forming a Y-shaped structure. The width of the seventh microstrip line (523) is smaller than the width of the eighth microstrip line (524) and the ninth microstrip line (525).

8. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 7, characterized in that, The crossover microstrip copper cladding layer (7) includes four microstrip line segments (71). Two microstrip line segments (71) are used to make a jump connection between an eighth microstrip line (524) and a ninth microstrip line (525) across a fourth microstrip line (514) through a metallized via (61). The other two microstrip line segments (71) are used to make two ninth microstrip lines (525) extend across another fourth microstrip line (514) through a metallized via (61). The jump connection and extension make the horizontally polarized fed microstrip line (51) and the vertically polarized fed microstrip line (52) have the same length.

9. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 8, characterized in that, The linewidth of the microstrip line segment (71) is the same as that of the eighth microstrip line (524) and the ninth microstrip line (525).

10. The low-profile multimode resonant broadband dual-polarized metasurface antenna according to claim 8, characterized in that, The lengths of the first microstrip line (511), the second microstrip line (512), the third microstrip line (513), and the fourth microstrip line (514) are 0.91 mm, 2 mm, 1.44 mm, and 7.8 mm, respectively; and the widths are 0.24 mm, 0.09 mm, 0.09 mm, and 0.24 mm, respectively. The lengths of the fifth microstrip line (521), the sixth microstrip line (522), the seventh microstrip line (523), the eighth microstrip line (524), and the ninth microstrip line (525) are 0.91 mm, 2 mm, 1.44 mm, 3.2 mm, and 3.6 mm, respectively; and the widths are 0.24 mm, 0.09 mm, 0.09 mm, 0.24 mm, and 0.24 mm, respectively. The microstrip line segment (71) has a length of 0.64 mm and a width of 0.24 mm.

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