A wideband filtering antenna fusing metasurface and AMC structure

Abstract

The application discloses a wide-band filtering antenna fusing a metasurface and an AMC structure, and particularly relates to the following: the upper layer metal patch comprises one rectangular metal patch, two L-shaped metal patches and two T-shaped metal patches, two rectangular slots are etched on one side of the rectangular metal patch; the two L-shaped metal patches realize filtering performance, and the two T-shaped metal patches and the two rectangular slots are used for adjusting impedance matching; the middle layer metal patch comprises one triangular metal patch and one trapezoidal metal patch, the triangular metal patch is penetrated by a first metal through hole; the lower layer metal patch is paved on a lower layer dielectric substrate and etches seventy-eight circular slots, one large circular slot and one rectangular slot; the lowermost layer metal patch is composed of a microstrip line and an artificial magnetic conductor, the artificial magnetic conductor is composed of eighty rectangular metal sheets and eighty metal through holes opened in the lower layer dielectric substrate, so that the antenna obtains a wider impedance bandwidth. The filtering antenna has the advantages of wide frequency band and good filtering characteristics.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of filtering antennas, in particular to a wide-band filtering antenna integrating a super surface and an AMC structure. BACKGROUND

[0002] In order to meet the increasing complexity and diversification of modern wireless communication systems, it is particularly important to design an antenna with low-frequency wide-band characteristics and good filtering function. Such an antenna can effectively break through the problem of narrow bandwidth faced by traditional filtering antennas in practical applications, and significantly improve the overall performance of the wireless communication system. The integrated design method of integrating the functions of the filter and the antenna in one body reduces the complexity and cost of the system under the premise of not introducing the filtering circuit structure, has good frequency selectivity and out-of-band suppression characteristics, and can effectively filter out interference signals.

[0003] With the rapid development of wireless communication technology, the complexity of the system and the demand for spectrum resources are increasing, especially in low-frequency applications, traditional antennas face problems such as narrow bandwidth and complex structure, and wide-band antennas with filtering characteristics can effectively improve these problems. In low-frequency applications, using a multi-layer metal sheet overlapping structure as an innovative antenna design method can improve the bandwidth of the antenna through a clever layering structure, while achieving efficient frequency selectivity. By utilizing the electromagnetic isolation and coupling effect of the layering structure, interference signals can be effectively suppressed while ensuring antenna gain, and by adjusting the electromagnetic properties between layers, the filtering performance can be optimized. In addition, combining filtering function with antenna design not only improves spectrum utilization efficiency, but also makes the radiation characteristics of the antenna in different frequency bands more in line with actual communication needs. Therefore, the low-frequency wide-band filtering antenna designed using the multi-layer metal patch overlapping structure can provide more flexible and efficient solutions for future communication systems. SUMMARY

[0004] The application aims to provide a wide-band filtering antenna integrating a super surface and an AMC structure, which is simple in structure and easy to implement, has a wide communication frequency band, good filtering performance, and stable gain.

[0005] The technical solution for achieving the application is as follows: a wide-band filtering antenna integrating a super surface and an AMC structure, comprising, from top to bottom, an uppermost metal patch, an uppermost dielectric substrate, an upper metal patch, an upper dielectric substrate, a middle metal patch, three middle dielectric substrates, a lower metal patch, a lower dielectric substrate, and a lowermost metal patch, wherein the dielectric substrate is rectangular, and the two long sides are defined as the upper edge and the lower edge, and the two short sides are defined as the left edge and the right edge.

[0006] The uppermost layer metal patch comprises ten antenna units, and a wide bandwidth characteristic of the antenna is realized;

[0007] The uppermost layer dielectric substrate connects the uppermost layer metal patch and the upper layer metal patch;

[0008] The upper layer metal patch comprises one rectangular metal patch, two L-shaped metal patches and two T-shaped metal patches, and two rectangular slots are etched on one side of the rectangular metal patch; the two L-shaped metal patches realize filtering performance, and the two T-shaped metal patches and the two rectangular slots are used for adjusting impedance matching;

[0009] The upper layer dielectric substrate connects the upper layer metal patch and the intermediate layer metal patch;

[0010] The intermediate layer metal patch comprises one triangular metal patch and one trapezoidal metal patch, and the triangular metal patch is penetrated by a first metal through hole penetrating the upper layer dielectric substrate, the intermediate three-layer dielectric substrate and the lower layer dielectric substrate;

[0011] The intermediate three-layer dielectric substrate connects the intermediate layer metal patch and the lower layer metal patch;

[0012] The lower layer metal patch is laid on the upper surface of the entire lower layer dielectric substrate, and seventy-eight circular slots of the same size, one large circular slot and one rectangular slot are etched;

[0013] The lower layer dielectric substrate connects the lower layer metal patch and the lowermost layer metal patch;

[0014] The lowermost layer metal patch is composed of a microstrip line and an artificial magnetic conductor, the artificial magnetic conductor is composed of eighty rectangular metal pieces of the same size and eighty metal through holes of the same size opened in the lower layer dielectric substrate, so that the antenna obtains a wider impedance bandwidth.

[0015] Further, each antenna unit in the uppermost layer metal patch is composed of one metal patch, and the ten antenna units correspond to the first to tenth metal pieces in sequence; the first to tenth metal pieces are ten identical rectangular metal pieces, the first to fifth metal pieces are uniformly spaced along the upper edge of the uppermost layer dielectric substrate, the sixth to tenth metal pieces are uniformly spaced along the lower edge of the upper layer dielectric substrate, and the first to fifth metal pieces and the sixth to tenth metal pieces are symmetrically arranged about the horizontal central axis.

[0016] Further, the upper layer metal patch comprises a rectangular metal patch, a first L-shaped metal patch, a second L-shaped metal patch, a first T-shaped metal patch and a second T-shaped metal patch;

[0017] The left side of the rectangular metal patch is etched with a first rectangular slot and a second rectangular slot; the first L-shaped metal patch, the first T-shaped metal patch, the first rectangular slot, and the second L-shaped metal patch, the second T-shaped metal patch, and the second rectangular slot are symmetrically arranged about the horizontal middle axis.

[0018] Further, the triangular metal patch and the trapezoidal metal patch of the middle layer metal patch are both symmetric structures, and the triangular metal patch is penetrated by the first metal via near the center position.

[0019] Further, the lower layer metal patch is etched with seventy-eight first circular slots of the same size, and the seventy-eight first circular slots are symmetrically distributed about the horizontal middle line of the lower layer dielectric substrate.

[0020] The first metal via penetrates the lower layer metal patch to form a circular slot, and a second circular slot with a larger diameter is formed at the orthographic projection position of the first metal via, a third rectangular slot is etched on one side of the second circular slot to connect the second circular slot, forming a key-shaped slot, and the key-shaped slot is symmetrically arranged about the horizontal middle line of the lower layer dielectric substrate.

[0021] Further, the lowest layer metal patch includes a rectangular microstrip line and eighty rectangular metal patches, and a second metal via with the same diameter is formed at the center of the orthographic projection position of each rectangular metal patch on the lower layer dielectric substrate.

[0022] Further, energy is input through the feed port, transmitted through the rectangular microstrip line, coupled to the middle layer metal patch and the upper layer metal patch through the key-shaped slot and the first metal via, and the lower layer metal patch is the ground of the antenna.

[0023] Further, the thickness of the uppermost layer dielectric substrate is 0.254 mm, the thickness of the upper layer dielectric substrate is 3 mm, the thickness of each of the three middle layer dielectric substrates is 5 mm, the thickness of the lower layer dielectric substrate is 1 mm, and the overall height of the antenna is 19.254 mm.

[0024] Compared with the prior art, the present application has the following advantages: (1) the low-frequency filtering performance of the antenna is realized by introducing L-shaped metal patches on both sides of the rectangular metal patch; (2) the high-frequency filtering performance of the antenna is realized by using a two-layer patch stacking method; (3) a wider impedance bandwidth is obtained by using metal via and circular slot via feed; (4) the low-frequency resonance point of the antenna is moved to the low-frequency direction by introducing two columns of metasurface units in the uppermost layer through the metal patch stacking method, thereby expanding the bandwidth of the antenna; (5) the high-frequency resonance point of the antenna is moved to the high-frequency direction by introducing a metalized via on the substrate and increasing a rectangular metal patch in the lowermost layer to form an artificial magnetic conductor structure, thereby further expanding the bandwidth of the antenna while ensuring the gain of the antenna remains unchanged. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1a is a side view of a wideband filtering antenna fusing metasurface and AMC structure.

[0026] Figure 1b is a top metal patch circuit diagram of a wideband filtering antenna fusing metasurface and AMC structure.

[0027] Figure 1c is a top dielectric substrate plan view of a wideband filtering antenna fusing metasurface and AMC structure.

[0028] Figure 1d is a middle metal patch circuit diagram of a wideband filtering antenna fusing metasurface and AMC structure.

[0029] Figure 1e is a middle dielectric substrate plan view of a wideband filtering antenna fusing metasurface and AMC structure.

[0030] Figure 1f is a bottom metal patch circuit diagram of a wideband filtering antenna fusing metasurface and AMC structure.

[0031] Figure 1g is a bottom dielectric substrate plan view of a wideband filtering antenna fusing metasurface and AMC structure.

[0032] Figure 1h is a bottom metal patch circuit diagram of a wideband filtering antenna fusing metasurface and AMC structure.

[0033] Figure 1i is a bottom dielectric substrate plan view of a wideband filtering antenna fusing metasurface and AMC structure.

[0034] Figure 1j is a bottom metal patch circuit diagram of a wideband filtering antenna fusing metasurface and AMC structure.

[0035] Figure 2 is a S11 curve diagram of a wideband filtering antenna fusing metasurface and AMC structure of the present invention.

[0036] Figure 3 is a gain curve diagram of a wideband filtering antenna fusing metasurface and AMC structure of the present invention.

[0037] Figure 4 is an E-plane radiation pattern at 1.66 GHz of a wideband filtering antenna fusing metasurface and AMC structure of the present invention.

[0038] Figure 5is the H-plane radiation pattern of the wideband filtering antenna fusing the metasurface and AMC structure at 1.66 GHz.

[0039] Figure 6 is the E-plane radiation pattern of the wideband filtering antenna fusing the metasurface and AMC structure at 1.85 GHz.

[0040] Figure 7 is the H-plane radiation pattern of the wideband filtering antenna fusing the metasurface and AMC structure at 1.85 GHz. DETAILED DESCRIPTION

[0041] The wideband filtering antenna fusing the metasurface and AMC structure has the characteristics of wide frequency band, stable gain and good filtering performance.

[0042] In combination Figures 1a to 1j , the wideband filtering antenna fusing the metasurface and AMC structure comprises, from top to bottom, an uppermost metal patch 1, an uppermost dielectric substrate 2, an upper metal patch 3, an upper dielectric substrate 4, a middle metal patch 5, a middle three-layer dielectric substrate 6, a lower metal patch 7, a lower dielectric substrate 8, and a lowermost metal patch 9, wherein the dielectric substrate is rectangular, and the two long sides are defined as the upper edge and the lower edge, and the two short sides are defined as the left edge and the right edge.

[0043] The uppermost metal patch 1 comprises ten antenna units, realizing the wideband characteristic of the antenna.

[0044] The uppermost dielectric substrate 2 connects the uppermost metal patch 1 and the upper metal patch 3.

[0045] The upper metal patch 3 comprises a rectangular metal patch, two L-shaped metal patches and two T-shaped metal patches, and two rectangular slots are etched on one side of the rectangular metal patch; the two L-shaped metal patches realize the filtering performance, and the two T-shaped metal patches and the two rectangular slots are used for adjusting impedance matching.

[0046] The upper dielectric substrate 4 connects the upper metal patch 3 and the middle metal patch 5.

[0047] The middle layer metal patch 5 includes a triangular metal patch 51 and a trapezoidal metal patch 52, the triangular metal patch 51 is penetrated by the first metal via hole 41, the first metal via hole 41 penetrates the upper layer dielectric substrate 4, the middle three layer dielectric substrate 6 and the lower layer dielectric substrate 8;

[0048] The middle three layer dielectric substrate 6 connects the middle layer metal patch 5 and the lower layer metal patch 7;

[0049] The lower layer metal patch 7 is paved on the upper surface of the lower layer dielectric substrate 8, and etches seventy-eight circular slits of the same size, one large circular slit and one rectangular slit;

[0050] The lower layer dielectric substrate 8 connects the lower layer metal patch 7 and the lowermost layer metal patch 9;

[0051] The lowermost layer metal patch 9 is composed of a microstrip line and an artificial magnetic conductor, the artificial magnetic conductor is composed of eighty rectangular metal pieces of the same size and eighty metal via holes of the same size opened in the lower layer dielectric substrate 8, so that the antenna obtains a wider impedance bandwidth.

[0052] As a specific example, each antenna unit in the uppermost layer metal patch 1 is composed of one metal patch, and ten antenna units correspond to the first to tenth metal patches 11, 12, 13, 14, 15, 16, 17, 18, 19, 110 in turn; the first to tenth metal patches 11, 12, 13, 14, 15, 16, 17, 18, 19, 110 are ten completely same rectangular metal patches, the first to fifth metal patches 11, 12, 13, 14, 15 are uniformly spaced along the upper edge of the uppermost layer dielectric substrate 2, the sixth to tenth metal patches 16, 17, 18, 19, 110 are uniformly spaced along the lower edge of the upper layer dielectric substrate 2, and the first to fifth metal patches 11, 12, 13, 14, 15 and the sixth to tenth metal patches 16, 17, 18, 19, 110 are symmetrically arranged about the horizontal central axis.

[0053] As a specific example, the upper layer metal patch 3 includes a rectangular metal patch 31, a first L-shaped metal patch 321, a second L-shaped metal patch 322, a first T-shaped metal patch 341 and a second T-shaped metal patch 342;

[0054] The left side of the rectangular metal patch 31 etches a first rectangular slit 331 and a second rectangular slit 332; the first L-shaped metal patch 321, the first T-shaped metal patch 341, the first rectangular slit 331 and the second L-shaped metal patch 322, the second T-shaped metal patch 342 and the second rectangular slit 332 are symmetrically arranged about the horizontal central axis.

[0055] As a specific example, the triangular metal patch 51 and the trapezoidal metal patch 52 of the intermediate layer metal patch 5 are both symmetrical structures, and the triangular metal patch 51 is close to the center and is penetrated by the first metal via hole 41.

[0056] As a specific example, the lower layer metal patch 7 is etched with seventy-eight first circular slits 73 of the same size, and the seventy-eight first circular slits 73 are equal in size and symmetrically distributed about the transverse midline of the lower layer dielectric substrate 8.

[0057] The first metal via hole 41 penetrates the lower layer metal patch 7 to form a circular slit, and a second circular slit 71 with a larger diameter is formed at the orthographic projection position of the first metal via hole 41, and a third rectangular slit 72 is etched on one side of the second circular slit 71 to be connected with the second circular slit 71, forming a key-shaped slit 74, which is symmetrically arranged about the transverse midline of the lower layer dielectric substrate 8.

[0058] As a specific example, the lowermost layer metal patch 9 includes a rectangular microstrip line 92 and eighty rectangular metal patches 91, and a second metal via hole 81 with the same diameter is formed at the center of the orthographic projection position of each rectangular metal patch 91 on the lower layer dielectric substrate 8.

[0059] As a specific example, energy is input through the feed port 93, transmitted through the rectangular microstrip line 92, coupled to the intermediate layer metal patch 5 and the upper layer metal patch 3 through the key-shaped slit 74 and the first metal via hole 41, and the lower layer metal patch 7 is the ground of the antenna.

[0060] As a specific example, the thickness of the uppermost layer dielectric substrate 2 is 0.254 mm, the thickness of the upper layer dielectric substrate 4 is 3 mm, the thickness of each of the intermediate three layer dielectric substrates 6 is 5 mm, and the thickness of the lower layer dielectric substrate 8 is 1 mm, and the overall height of the antenna is 19.254 mm.

[0061] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Embodiments

[0063] In combination with Fig. 1, the wideband filtering antenna of the application fuses the super surface and the AMC structure, comprising the uppermost layer metal patch 1, the uppermost layer dielectric substrate 2, the upper layer metal patch 3, the upper layer dielectric substrate 4, the middle layer metal patch 5, the middle three-layer dielectric substrate 6, the lower layer metal patch 7, the lower layer dielectric substrate 8, and the lowermost layer metal patch 9; the uppermost layer metal patch is composed of ten identical first to tenth metal patches 11, 12, 13, 14, 15, 16, 17, 18, 19, and 110, the metal patches are divided into two columns, each column is closely attached to the edge of the uppermost layer dielectric substrate 2, and is symmetric about the middle line of the uppermost layer dielectric substrate 2. The upper layer metal patch 3 is composed of a rectangular metal patch 31, two L-shaped metal patches 321 and 322, and two T-shaped metal patches 341 and 342, and two rectangular slits 331 and 332 are etched on one side of the rectangular metal patch 31, the two L-shaped metal patches 321 and 322, the two T-shaped metal patches 341 and 342, and the etched first rectangular slit 331 and second rectangular slit 332 are symmetric about the middle line of the upper layer dielectric substrate 4. The middle layer metal patch 5 is composed of a triangular metal patch 51 and a trapezoidal metal patch 52, the adjacent sides of the triangular metal patch 51 and the trapezoidal metal patch 52 are equal in length and coincide, the triangular metal patch 51 and the trapezoidal metal patch 52 are symmetric about the middle line of the upper layer dielectric substrate 4, the triangular metal patch 51 is penetrated by a first metal through hole 41 close to the center position, and the first metal through hole 41 penetrates the upper layer dielectric substrate 4, the middle three-layer dielectric substrate 6, and the lower layer dielectric substrate 8. The lower layer metal patch 7 is laid on the upper surface of the entire lower layer dielectric substrate 8 and etches seventy-eight first circular slits 73 of the same size and a "key" shaped slit 74 composed of a second circular slit 71 and a rectangular slit 72, which is equivalent to the ground of the antenna, and the etched seventy-eight first circular slits 73 and the "key" shaped slit 74 are symmetric about the middle line of the lower layer dielectric substrate 8. The lowermost layer metal patch 9 is composed of a rectangular microstrip line 92 and eighty metal patches 91, one end of the rectangular microstrip line 92 is connected to a feeding port 93, the other end is connected to the first metal through hole 41, the eighty metal patches 91 are of the same size and are equidistant in front and back and left and right, and are symmetric about the middle line of the lower layer dielectric substrate 8.

[0064] The design process of the application is as follows:

[0065] (1) The thickness of the uppermost layer dielectric substrate 2 is 0.254 mm, and the dielectric constant is 2.2, the thickness of the upper layer dielectric substrate 4 is 3 mm, and the dielectric constant is 2.2, the total thickness of the middle three-layer dielectric substrate 6 is 15 mm, and the dielectric constant is 2.2, wherein the thickness of each layer of dielectric substrate is 5 mm, and the dielectric constant is 2.2, the thickness of the lower layer dielectric substrate 8 is 1 mm, and the dielectric constant is 2.2.

[0066] (II) The two columns of super surface units in the uppermost metal patch 1 are introduced by the way of metal patch layering, which makes the low frequency resonance point of the antenna move to the low frequency direction and expands the bandwidth of the antenna.

[0067] (III) The L-shaped metal patches 321 and 322 on both sides of the upper metal patch 3 realize the low frequency filtering performance of the antenna.

[0068] (IV) The upper metal patch 3 and the middle layer metal patch 5 are layered by using the way of two patch layering, which realizes the high frequency filtering performance of the antenna.

[0069] (V) The artificial magnetic conductor structure is formed by introducing the second metal via hole 81 in the lower layer dielectric substrate 8 and adding the rectangular metal patch 91 in the lowermost layer, which makes the high frequency resonance point of the antenna move to the high frequency direction and further expands the bandwidth of the antenna while ensuring the gain of the antenna.

[0070] In combination Figures 1a to 1j , the wideband filtering antenna of the application fuses the super surface and the AMC structure, the material of the uppermost dielectric substrate 2 is Roger RT 5880, the dielectric constant =2.2, the thickness is 0.254mm, and the size is 60mm 97mm 0.254mm, the material of the upper dielectric substrate 4 is F4BM, the dielectric constant =2.2, the thickness is 3mm, and the size is 60mm 97mm 3mm, the materials of the middle three dielectric substrates 6 are all F4BM, the dielectric constant =2.2, the thickness of each layer is 5mm, the total thickness of the three layers is 15mm, and the size of the three layers is 60mm 97mm 15mm, the material of the lower dielectric substrate 8 is F4BM, the dielectric constant =2.2, the thickness is 1mm, and the size is 60mm 97mm 1mm; the diameter of the seventy-eight first circular slots 73 etched in the lower metal patch 7 is 2mm, the diameter of the second circular slot 71 part of the “key” type slot 74 etched is 6.4mm, one side of the rectangular slot 72 is coincided with the diameter of the second circular slot 71, the length of the rectangular slot 72 is 20mm, and the width is 2mm; the diameter of the first metal via hole 41 penetrating the upper dielectric substrate 4, the middle three dielectric substrates 6 and the lower dielectric substrate 8 is 3.22mm, and the diameter of the eighty second metal via hole 81 penetrating the lower dielectric substrate 8 is 2mm.

[0071] Figure 2is the S of the wideband filtering antenna of the fusion metasurface and AMC structure of the present application 11 The working frequency band of the wideband filtering antenna of the fusion metasurface and AMC structure is 1.37-1.87GHz, the absolute bandwidth is 0.5GHz, and the relative bandwidth is 30.9%, and the present application has a low working frequency band and a wide relative bandwidth.

[0072] Figure 3 is the gain-frequency curve of the wideband filtering antenna of the fusion metasurface and AMC structure of the present application, two radiation zeros are generated at 1.27GHz and 1.89GHz respectively, the in-band gain is stable, the average gain is 6.3dBi, and the highest gain is 6.5dBi.

[0073] Figure 4 、 Figure 5 is the E-plane and H-plane normalized radiation pattern of the wideband filtering antenna of the fusion metasurface and AMC structure of the present application at 1.66GHz, the wideband filtering antenna of the fusion metasurface and AMC structure has a stable pattern and a low cross-polarization level.

[0074] Figure 6 、 Figure 7 is the E-plane and H-plane normalized radiation pattern of the wideband filtering antenna of the fusion metasurface and AMC structure of the present application at 1.85GHz, the wideband filtering antenna of the fusion metasurface and AMC structure has a stable pattern and a low cross-polarization level.

[0075] In summary, the wideband filtering antenna of the fusion metasurface and AMC structure of the present application has a wide relative bandwidth and a stable gain, and the radiation pattern is stable, the structure is simple, and it is easy to process and realize.

Claims

1. A wideband filtering antenna of fusion metasurface and AMC structure, characterized in that, The antenna comprises, from top to bottom, an uppermost metal patch (1), an uppermost dielectric substrate (2), an upper metal patch (3), an upper dielectric substrate (4), a middle metal patch (5), a middle three-layer dielectric substrate (6), a lower metal patch (7), a lower dielectric substrate (8), and a lowermost metal patch (9), wherein the dielectric substrate is rectangular, and two long sides are defined as the upper edge and the lower edge, and two short sides are defined as the left edge and the right edge. The uppermost metal patch (1) comprises ten antenna units, which realize the wide bandwidth characteristic of the antenna. The uppermost dielectric substrate (2) connects the uppermost metal patch (1) and the upper metal patch (3). The upper metal patch (3) comprises a rectangular metal patch, two L-shaped metal patches, and two T-shaped metal patches, and two rectangular slots are etched on one side of the rectangular metal patch; the two L-shaped metal patches realize the filtering performance, and the two T-shaped metal patches and the two rectangular slots are used for adjusting impedance matching. The upper dielectric substrate (4) connects the upper metal patch (3) and the middle metal patch (5). The middle metal patch (5) comprises a triangular metal patch (51) and a trapezoidal metal patch (52), and the triangular metal patch (51) is penetrated by a first metal through hole (41), and the first metal through hole (41) penetrates the upper dielectric substrate (4), the middle three-layer dielectric substrate (6), and the lower dielectric substrate (8). The middle three-layer dielectric substrate (6) connects the middle metal patch (5) and the lower metal patch (7). The lower metal patch (7) covers the upper surface of the lower dielectric substrate (8), and etches seventy-eight circular slots of the same size, one large circular slot, and one rectangular slot. The lower dielectric substrate (8) connects the lower metal patch (7) and the lowermost metal patch (9). The lowermost metal patch (9) is composed of a microstrip line and an artificial magnetic conductor, and the artificial magnetic conductor is composed of eighty rectangular metal pieces of the same size and eighty metal through holes of the same size in the lower dielectric substrate (8), so that the antenna obtains a wider impedance bandwidth.

2. The wideband filtering antenna of fused metasurface and AMC structure according to claim 1, wherein, Each antenna unit in the uppermost metal patch (1) is composed of one metal patch, and the ten antenna units correspond to the first to tenth metal pieces (11, 12, 13, 14, 15, 16, 17, 18, 19, 110) in sequence; the first to tenth metal pieces (11, 12, 13, 14, 15, 16, 17, 18, 19, 110) are ten identical rectangular metal pieces, the first to fifth metal pieces (11, 12, 13, 14, 15) are uniformly spaced along the upper edge of the uppermost dielectric substrate (2), the sixth to tenth metal pieces (16, 17, 18, 19, 110) are uniformly spaced along the lower edge of the uppermost dielectric substrate (2), and the first to fifth metal pieces (11, 12, 13, 14, 15) and the sixth to tenth metal pieces (16, 17, 18, 19, 110) are symmetrically arranged about the horizontal central axis.

3. The wideband filtering antenna of fused metasurface and AMC structure according to claim 2, characterized in that, The upper layer metal patch (3) comprises a rectangular metal patch (31), a first L-shaped metal patch (321), a second L-shaped metal patch (322), a first T-shaped metal patch (341) and a second T-shaped metal patch (342). The left side of the rectangular metal patch (31) is etched with a first rectangular slot (331) and a second rectangular slot (332); the first L-shaped metal patch (321), the first T-shaped metal patch (341) and the first rectangular slot (331) are symmetrically arranged with the second L-shaped metal patch (322), the second T-shaped metal patch (342) and the second rectangular slot (332) about a horizontal middle axis.

4. The wideband filtering antenna of fused metasurface and AMC structure according to claim 3, characterized in that, The triangular metal patch (51) and the trapezoidal metal patch (52) of the middle layer metal patch (5) are both symmetrical structures, and the triangular metal patch (51) is penetrated by the first metal through hole (41) near the center position.

5. The wideband filtering antenna of fused metasurface and AMC structure according to claim 4, characterized in that, The lower layer metal patch (7) is etched with seventy-eight first circular slots (73) of the same size; the seventy-eight first circular slots (73) are equal in size and symmetrically distributed about a horizontal middle line of the lower layer dielectric substrate (8) in up and down directions; The first metal through hole (41) penetrates the lower layer metal patch (7) to form a circular slot, and a second circular slot (71) with a larger diameter is formed at the orthographic projection position of the first metal through hole (41); a third rectangular slot (72) is etched on one side of the second circular slot (71) and connected with the second circular slot (71), forming a key-shaped slot (74), which is symmetric about the horizontal middle line of the lower layer dielectric substrate (8) in up and down directions.

6. The wideband filtering antenna of fused metasurface and AMC structure according to claim 5, wherein, The lowermost layer metal patch (9) comprises a rectangular microstrip line (92) and eighty rectangular metal patches (91), and a second metal through hole (81) with the same diameter is formed at the center of the orthographic projection position of each rectangular metal patch (91) on the lower layer dielectric substrate (8).

7. The wideband filtering antenna of fused metasurface and AMC structure according to claim 6, characterized in that, Energy is input through a feed port (93), transmitted through the rectangular microstrip line (92), coupled to the middle layer metal patch (5) and the upper layer metal patch (3) through the key-shaped slot (74) and the first metal through hole (41), and the lower layer metal patch (7) is the ground of the antenna.

8. The wideband filtering antenna of fused metasurface and AMC structure according to any one of claims 1-7, characterized in that, The thickness of the uppermost layer dielectric substrate (2) is 0.254 mm, the thickness of the upper layer dielectric substrate (4) is 3 mm, the thickness of each of the three middle layer dielectric substrates (6) is 5 mm, and the thickness of the lower layer dielectric substrate (8) is 1 mm.

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