Multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation

Abstract

The present invention discloses a multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation, comprising a first layer of dielectric substrate, a second layer of dielectric substrate and a third layer of dielectric substrate which are stacked and placed, the upper and lower surfaces of the first layer of dielectric substrate are respectively provided with magnetoelectric dipole antenna units and metal floors arranged in an array, the second layer of dielectric substrate is provided with a feeding layer, the third layer of dielectric substrate is provided with a GCPW switching layer, two metal grounding column walls are provided on both side edges of the upper surface of the first layer of dielectric substrate, and magnetoelectric dipole antenna units are provided between the two metal grounding column walls; multiple coupling cancellation paths are provided in the first layer of dielectric substrate to cancel the inherent coupling paths. Compared with the traditional high-isolation antenna, the decoupling structure of the present invention is simple, and no additional profile is required to achieve decoupling of the multi-frequency antenna. Moreover, the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation. Background Art

[0002] With the development of the fifth generation of wireless communication technology, millimeter wave array antennas are a hot research topic. Millimeter wave array antennas have the advantages of high bandwidth, high speed, low latency, and small size, and are widely used in base station antennas, indoor communications, fixed-point communications and other applications. However, the problems of severe surface waves and excessive coupling in millimeter wave antenna arrays seriously deteriorate the radiation efficiency and scanning angle of array antennas. In order to improve the coupling between array antennas, the traditional high isolation method is generally applicable to binary arrays and is difficult to expand to large array designs. In recent years, array antennas using decoupling surfaces can achieve high isolation performance. However, this decoupling structure requires the decoupling surface to be placed at certain specific positions above the antenna array. The height is determined by the reflection phase of the decoupling surface and the inherent coupling phase. However, the use of this decoupling surface will bring many problems such as additional profiles and complex designs. This poses a great challenge to the overall design of the antenna array and is not suitable for antenna design in compact environments. As a broadband low-profile radiating antenna, the magnetoelectric dipole antenna unit is widely used in phased array antennas. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a multi-frequency high-isolation millimeter-wave phased array antenna with multi-path cancellation.

[0004] The present invention not only has the characteristics of high isolation, small size and simple structure, but also can ensure the improvement of port isolation and scanning performance of the phased array antenna.

[0005] The present invention adopts the following technical solution:

[0006] A multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation, comprising a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are stacked and placed, wherein the upper and lower surfaces of the first dielectric substrate are respectively provided with magnetoelectric dipole antenna units arranged in an array and a metal floor, the second dielectric substrate is provided with a feeding layer, the third dielectric substrate is provided with a GCPW switching layer, two metal grounding column walls are provided at both side edges of the upper surface of the first dielectric substrate, and the magnetoelectric dipole antenna unit is provided between the two metal grounding column walls;

[0007] When there are two magnetoelectric dipole antenna units, a first decoupling path is set between adjacent magnetoelectric dipole antenna units;

[0008] When there are at least three magnetoelectric dipole antenna units, a first decoupling path is set between adjacent magnetoelectric dipole antenna units, and second decoupling paths are set at both ends of other magnetoelectric dipole antenna units except for two magnetoelectric dipole antenna units arranged close to the metal grounding column wall.

[0009] Furthermore, decoupling grounding posts are arranged on both sides of each magnetoelectric dipole antenna unit.

[0010] Furthermore, two first decoupling paths are arranged between adjacent magnetoelectric dipole antenna units and are symmetrically arranged about the longitudinal axis of the first dielectric substrate.

[0011] Further, the first decoupling path includes m first grounding posts, n first metal strips and o second metal strips;

[0012] When m=3, n=1, o=1, two of the first grounding posts are symmetrically arranged along the center of the first metal strip, the third first grounding post is arranged at the center of the first metal strip, and the three first grounding posts are connected by the second metal strip;

[0013] When m>3, n≥2, o≥2, n first metal strips are placed in parallel, and each first metal strip is provided with two or three first grounding poles. When the first metal strip is provided with two first grounding poles, the two first grounding poles are provided symmetrically along the center, and the second metal strip is used to connect the two first grounding poles; when the first metal strip is provided with three first grounding poles, they are provided according to m=3, and the second metal strip is used to connect the three first grounding poles.

[0014] Further, the second decoupling path includes at least two second grounding posts and at least one third metal strip;

[0015] When two second grounding posts and a third metal strip are included, the two second grounding posts are symmetrically arranged along the center of the third metal strip;

[0016] When more than two second grounding posts and a plurality of third metal strips are included, the plurality of third metal strips are arranged in parallel, and every two second grounding posts are symmetrically arranged along the center point of the third metal strip.

[0017] Furthermore, the metal floor is provided with an H-shaped gap.

[0018] Furthermore, a shielding metal wall is provided at the feeding layer, and the shielding metal wall includes an isolation strip and a plurality of fourth grounding poles, and the isolation strip and the plurality of fourth grounding poles are symmetrically placed around the H-shaped gap to form a cavity.

[0019] Furthermore, the magnetoelectric dipole antenna unit includes four rectangular metal patches with cut corners and 12 third grounding posts. Three third grounding posts are arranged on each rectangular metal patch, and an H-shaped gap is used for excitation.

[0020] Furthermore, the feeding layer includes stripline feeding, microstrip line feeding, substrate integrated waveguide feeding network or coplanar waveguide feeding.

[0021] Furthermore, the first metal strip and the second metal strip are in a π shape, an n shape, an H shape, an L shape, an M shape, a double T shape, a T shape or a triple T shape.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention includes a decoupling path based on a coupling cancellation path, a magnetoelectric dipole antenna, and a feeding network. Since multiple simple decoupling paths are used and placed at different positions, they are respectively used to cancel the inherent coupling between array elements at different frequencies, thereby minimizing the interference between multiple paths, while enhancing the isolation between antenna units or antenna subarrays at multiple frequency bands, and improving the active S parameters at different frequencies and the scanning capability of the array antenna, and also having the advantages of compact structure and simple design.

[0024] (2) The present invention has scalability by adopting a decoupling path based on a coupling cancellation path, and can be widely used in array decoupling of different numbers and polarizations.

[0025] (3) The present invention can control the amplitude and phase of the introduced coupling by adjusting the height, length and width of the decoupling path, thereby enhancing the isolation between antenna units or antenna subarrays.

[0026] (4) The present invention achieves broadband matching characteristics by adopting a magnetoelectric dipole antenna.

[0027] (5) The present invention has a simple structure, is easy to process, and has a relatively low cost and weight. Therefore, it can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of the multi-frequency high-isolation millimeter-wave phased array antenna of the present invention;

[0029] Figure 2(a) is Figure 1 A top view of the medium magneto-electric dipole antenna unit and the feeding layer;

[0030] FIG. 2( b ) and FIG. 2( c ) are schematic diagrams of dimension parameters of the first decoupling path;

[0031] FIG3( a ) is a result diagram of the S parameters of the low-frequency band of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention after decoupling;

[0032] FIG3( b ) is a result diagram of the S parameters of the high frequency band of the multi-frequency high isolation millimeter wave phased array antenna based on multipath cancellation of the present invention after decoupling;

[0033] FIG4( a ) is a result diagram of the S parameters of the low-frequency band of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention before decoupling;

[0034] FIG4( b ) is a result diagram of the S parameters of the high frequency band of the multi-frequency high isolation millimeter wave phased array antenna based on multipath cancellation of the present invention before decoupling;

[0035] Figure 5 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to the maximum scanning angle at 25GHz;

[0036] Figure 6 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to a large scanning angle at 27GHz;

[0037] Figure 7 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to a large scanning angle at 29GHz;

[0038] Figure 8 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to a large scanning angle at 37GHz;

[0039] Fig. 9 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to a large scanning angle at 40GHz;

[0040] Fig.10 This is a result diagram of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention scanning to a large scanning angle at 42GHz;

[0041] FIG11( a ) is an active S-parameter curve of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention when scanning to the maximum angle in the low frequency band;

[0042] FIG11( b ) is an active S-parameter curve of the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation of the present invention when scanning to the maximum angle in the high frequency band. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0044] Example

[0045] In this embodiment, the XYZ axis directions are as follows Figure 1 As shown, the X axis is the vertical direction, and the Y axis is the horizontal direction. In this embodiment, the two sides refer to the direction along the X axis, and the upper and lower ends refer to the direction along the Y axis.

[0046] like Figure 1 As shown in Figure 2(a), a multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation includes a first dielectric substrate, a second dielectric substrate and a third dielectric substrate stacked together, wherein N array-arranged magnetoelectric dipole antenna units 1 and a metal floor 2 are respectively arranged on the upper and lower surfaces of the first dielectric substrate, a feeding layer 11 is arranged on the second dielectric substrate, and a GCPW switching layer 20 is arranged on the third dielectric substrate.

[0047] Further, the present embodiment includes 1*4 magnetoelectric dipole antenna units 1, which are arranged along the X-axis direction, and a first decoupling path 3 is arranged between adjacent magnetoelectric dipole antenna units 1, and the decoupling path is arranged on the transverse central axis between two adjacent magnetoelectric dipole antenna units 1, and each two are a group, and are symmetrically arranged along both sides of the longitudinal central axis, and two metal grounding column walls 13 are arranged on both side edges of the upper surface of the first layer of dielectric substrate, and the magnetoelectric dipole antenna unit 1 is arranged between the two metal grounding column walls 13;

[0048] Specifically, the first decoupling path 3 includes m first grounding posts 4, n first metal strips 5 and o second metal strips 6;

[0049] In this embodiment, when m=3, n=1, o=1, two of the first grounding posts 4 are symmetrically arranged along the center of the first metal strip 5, the third first grounding post 4 is arranged at the center of the first metal strip 5, and the three first grounding posts 4 are connected by the second metal strip 5;

[0050] When m>3, n≥2, o≥2, n first metal strips 5 are placed in parallel, and each first metal strip 5 is provided with two or three first grounding poles 4. When the first metal strip 5 is provided with two first grounding poles, the two first grounding poles 4 are symmetrically arranged along the center, and the second metal strip 6 is used to connect the two first grounding poles; when the first metal strip 5 is provided with three first grounding poles 4, they are arranged according to m=3, and the second metal strip 6 is used to connect the three first grounding poles 4.

[0051] For example, when m=5, two first metal strips 5 are arranged in parallel, three first grounding poles 4 are arranged on one first metal strip 5 , and the second metal strip 6 connects the three first grounding poles 4 ; the other two are arranged on another first metal strip 5 , and another second metal strip 6 connects the two first grounding poles 4 .

[0052] When m=7, three first metal strips 5 are arranged in parallel, and the first grounding posts are arranged in groups of 2, 2, and 3.

[0053] The first grounding column 4 can be a rectangular parallelepiped or a cylinder; the first metal strip 5 and the second metal strip 6 can be in a π shape, an n shape, an H shape, an L shape or an M shape, a double T shape, a T shape or a triple T shape.

[0054] The coupling cancellation path formed by the plurality of first grounding posts 4, the plurality of first metal strips 5 and the plurality of second metal strips 6 can provide higher isolation. The first decoupling path 3 enables the elements of the phased array antenna to be arranged compactly and achieve high isolation between the ports in the low frequency band. The isolation in the low frequency band can reach 20 dB.

[0055] Further, if Figure 1 As shown in FIG. 2( a ), in this embodiment, except for the magneto-electric dipole antenna units 1 disposed at the edges of both sides, second decoupling paths 7 are disposed at both ends of other magneto-electric dipole antenna units 1 .

[0056] Specifically, a second decoupling path 7 is symmetrically arranged at two ends of each magnetoelectric dipole antenna unit 1 , that is, in the Y direction.

[0057] When the magnetoelectric dipole antenna units 1 are arranged in a 1*2 array, there is no need to set the second decoupling path 7 .

[0058] The second decoupling path 7 includes at least two second grounding posts 9 and at least one third metal strip 8;

[0059] When two second grounding posts 9 and one third metal strip 8 are included, the two second grounding posts 9 are symmetrically arranged along the center of the third metal strip 8;

[0060] When the number of the second grounding posts 9 is an even number greater than 2, a plurality of third metal strips 8 are arranged in parallel, and every two second grounding posts 9 are symmetrically arranged along the center point of the third metal strip 8 .

[0061] The second grounding column 9 may be a rectangular parallelepiped or a cylinder; the shape of the third metal strip 8 may be I-shaped, π-shaped, n-shaped, H-shaped, L-shaped, M-shaped or T-shaped.

[0062] Furthermore, on both sides of each magnetoelectric dipole unit 1 , that is, in the X-axis direction, decoupling grounding posts 10 are symmetrically arranged, one on each side.

[0063] The second decoupling path 7 and the decoupling grounding column 10 can provide higher isolation, introduce a coupling path in the high frequency band to offset the inherent coupling of the antenna, improve the isolation of the phased array in the high frequency band, and improve the radiation pattern in the high frequency band array, so that the isolation in the high frequency band can reach 20dB.

[0064] The first decoupling path 3, the second decoupling path 7 and the decoupling grounding column 10 can be used in high-isolation array antennas, including microstrip patch antennas, slot antennas, metasurface antennas, electric dipole antennas, magneto-electric dipole antennas, monopole antennas, planar aperture antennas or on-chip antenna arrays.

[0065] Furthermore, the metal floor 2 is provided with an H-shaped gap 12, which is provided at the center of the shielding metal wall 15. Since the H-shaped gap 12 is linearly polarized excitation, the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation is linearly polarized radiation. The metal grounding column walls 13 on both sides of the phased array are used to improve the scanning performance of the phased array.

[0066] Specifically, the metal grounding column wall 13 is composed of a plurality of fifth grounding columns 14 arranged in a line.

[0067] Furthermore, the feeding layer 11 includes stripline feeding, microstrip line feeding, substrate integrated waveguide feeding network or coplanar waveguide feeding.

[0068] The feed layer 11 is provided with a shielding metal wall 15 , and the shielding metal wall 15 includes an isolation strip 16 and a plurality of fourth grounding posts 17 . The isolation strip 16 and the plurality of fourth grounding posts 17 are symmetrically placed around the H-shaped gap to form a cavity for reducing the field diffusion of the H-shaped gap 12 .

[0069] Furthermore, the magnetoelectric dipole antenna unit 1 includes four rectangular metal patches 18 with cut corners and 12 third grounding posts 19 . The four rectangular metal patches 18 with cut corners are arranged in a 2*2 array, and each rectangular metal patch 18 is provided with three third grounding posts 19 .

[0070] In this embodiment, the multi-frequency high isolation millimeter wave phased array antenna based on multipath cancellation is processed by low temperature co-fired ceramic technology, and the dielectric substrate is Ferro A6ME. The X-axis direction of the dielectric substrate is the vertical direction, the Y-axis direction is the horizontal direction, and the origin is the center point of the dielectric substrate. The XY coordinate system mentioned in this embodiment is based on Figure 1 shall prevail.

[0071] In this embodiment, the dielectric constant ε of the dielectric substrate is r is [1 10.2], the thickness is [0.01λ, 0.3λ], and the thickness of the metal floor is [0.005λ, 0.1λ], where λ is the free space wavelength.

[0072] In this embodiment, the magnetoelectric dipole antenna unit 1 is composed of a rectangular metal patch 18 with a cut corner and 12 third grounding posts 19, and an H-shaped gap 12 is used for excitation. A multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation is arranged along the x-axis. By adjusting the size and placement position of the first decoupling path 3, the phase and amplitude of the introduced coupling cancellation path are adjusted, so as to achieve cancellation with the original inherent coupling path in the low frequency band, and achieve four-element array decoupling. By adjusting the size and placement position of the second decoupling path 7 and the decoupling ground post 10, the phase and amplitude of the introduced coupling cancellation path are adjusted, so as to achieve cancellation with the original inherent coupling path in the high frequency band, and achieve four-element array decoupling. The first decoupling path 3, the second decoupling path 7, and the number of decoupling ground posts 10 introduced can be multiple, and the shapes of the first decoupling path 3 and the second decoupling path 7 introduced can be different, so as to further adjust the amplitude and phase of the coupling cancellation path branches to achieve a better decoupling effect.

[0073] In this embodiment, the feeding is in the form of a strip line.

[0074] As shown in FIG. 2(a), FIG. 2(b) and FIG. 2(c), the dimensions of each part in the present invention are:

[0075] The patch height of the magnetoelectric dipole antenna unit 1 is [0.01λ, 0.3λ], the size w1 of the rectangular metal patch 18 with cut corners is [0.01λ, 0.25λ], w2 is [0.01λ, 0.25λ], l1 is [0.01λ, 0.2λ], l2 is [0.01λ, 0.1λ], and the length s1 of the H-shaped gap 12 on the metal floor 2 is [0.0 1λ, 0.3λ], s2 is [0.01λ, 0.2λ], the dimensions of the first decoupling path 3, l3 is [0.01λ, 0.25λ], l4 is [0.01λ, 0.1λ], w3 is [0.01λ, 0.1λ], w4 is [0.01λ, 0.2λ], w5 is [0.01λ, 0.2λ], w6 is [0.01λ, 0.2λ]. The length l5 of the second decoupling path 7 is [0.01λ, 0.2λ], the width w7 is [0.01λ, 0.2λ], and the inter-unit spacing d1 is [0.2λ, 0.6λ], where λ is the free space wavelength.

[0076] The preferred dimensions of each part in this embodiment are as follows:

[0077] The patch height of the magnetoelectric dipole antenna unit 1 is 0.846 mm, the dimensions of the rectangular metal patch 18 with cut corners are w1 of 1.4 mm, w2 of 1 mm, l1 of 1.05 mm, and l2 of 0.55 mm, the length s1 of the H-shaped gap 12 on the metal floor 2 is 1.15 mm, s2 of 0.2 mm, the dimensions of the first decoupling path 3 are l3 of 1.9 mm, l4 of 0.3 mm, w3 of 0.2 mm, w4 of 0.6 mm, w5 of 0.3 mm, and w6 of 0.6 mm. The length l5 of the second decoupling path 7 is 0.6 mm, the width w7 is 0.2 mm, and the spacing d1 between the units is 4.5 mm, where λ is the free space wavelength.

[0078] The decoupling process of the present invention is as follows:

[0079] There is inherent coupling between antenna units. By introducing the first and second coupling cancellation paths and adjusting the amplitude and phase of the coupling paths, the inherent coupling between the antenna units is equal in amplitude and opposite in phase, thereby canceling out the inherent coupling and achieving decoupling. By introducing multiple decoupling paths, decoupling of multiple frequency bands can be achieved.

[0080] As shown in Figures 3(a) and 3(b), the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation has an operating frequency band of 24.69-29.5GH (17.7%) and 37-42.29GHz (13.3%), an in-band reflection coefficient lower than -10dB, and an in-band isolation greater than 20dB. As shown in Figures 4(a) and 4(b), the port isolation before loading the decoupling path is shown. After loading the decoupling path, the isolation between adjacent units can be improved, thereby improving the radiation efficiency.

[0081] like Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown in the figure, the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation can achieve large-angle scanning performance within the band. The specific performance is shown in Table 1. The phased array can achieve beam scanning of more than ±54° in the low frequency band. At 25GHz, beam scanning from -64° to 63° can be achieved, and the gain fluctuation is less than 2.4dB. In the high frequency band, beam scanning from -39° to 41° can be achieved. At 37GHz, beam scanning of ±59° can be achieved, and the gain fluctuation is less than 3dB.

[0082] Table 1

[0083] frequency Scan Angle Gain fluctuation(dB) 25GHz -64° to 63° 2.4 27GHz -61° to 61° 1.2 29GHz -54° to 54° 2.9 37GHz -59° to 59° 3 40GHz -48° to 48° 3.1 42GHz -39° to 41° 3.6

[0084] As shown in Figure 11(a) and Figure 11(b), when the multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation scans to the maximum scanning angle in the frequency band (25GHz-29GHz), the active S parameter is lower than -7dB. When the frequency band (37GHz-42GHz) scans to the maximum scanning angle, the active S parameter is basically lower than -10dB.

[0085] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A multi-frequency high-isolation millimeter-wave phased array antenna based on multipath cancellation, characterized in that: It comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are stacked and placed, wherein the upper and lower surfaces of the first dielectric substrate are respectively provided with magnetoelectric dipole antenna units arranged in an array and a metal floor, the second dielectric substrate is provided with a feeding layer, the third dielectric substrate is provided with a GCPW switching layer, two metal grounding column walls are provided at both side edges of the upper surface of the first dielectric substrate, and the magnetoelectric dipole antenna unit is provided between the two metal grounding column walls; Decoupling grounding posts are provided on both sides of each magnetoelectric dipole antenna unit; When there are two magnetoelectric dipole antenna units, a first decoupling path is set between adjacent magnetoelectric dipole antenna units; When there are at least three magnetoelectric dipole antenna units, a first decoupling path is set between adjacent magnetoelectric dipole antenna units, and except for two magnetoelectric dipole antenna units arranged near the metal grounding column wall, second decoupling paths are set at both ends of other magnetoelectric dipole antenna units; The first decoupling path includes m first grounding posts, n first metal strips and o second metal strips; When m=3, n=1, o=1, two of the first grounding posts are symmetrically arranged along the center of the first metal strip, the third first grounding post is arranged at the center of the first metal strip, and the three first grounding posts are connected by the second metal strip; When m>3, n≥2, o≥2, n first metal strips are placed in parallel, and each first metal strip is provided with two or three first grounding posts. When the first metal strip is provided with two first grounding posts, the two first grounding posts are provided symmetrically along the center, and the second metal strip is used to connect the two first grounding posts; when the first metal strip is provided with three first grounding posts, they are provided according to m=3, and the second metal strip is used to connect the three first grounding posts; The second decoupling path includes at least two second grounding posts and at least one third metal strip; When two second grounding posts and one third metal strip are included, the two second grounding posts are symmetrically arranged along the center of the third metal strip; When more than two second grounding posts and a plurality of third metal strips are included, the plurality of third metal strips are arranged in parallel, and every two second grounding posts are symmetrically arranged along the center point of the third metal strip.

2. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 1, characterized in that: Two first decoupling paths are arranged between adjacent magnetoelectric dipole antenna units and are symmetrically arranged about the longitudinal axis of the first dielectric substrate.

3. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 1, characterized in that: The metal floor is provided with an H-shaped gap.

4. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 3, characterized in that: The feed layer is provided with a shielding metal wall, and the shielding metal wall comprises an isolation strip and a plurality of fourth grounding poles, and the isolation strip and the plurality of fourth grounding poles are symmetrically placed around the H-shaped gap to form a cavity.

5. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 3, characterized in that: The magnetoelectric dipole antenna unit includes four rectangular metal patches with cut corners and 12 third grounding posts. Three third grounding posts are arranged on each rectangular metal patch, and an H-shaped gap is used for excitation.

6. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 1, characterized in that: The feeding layer includes stripline feeding, microstrip line feeding, substrate integrated waveguide feeding network or coplanar waveguide feeding.

7. The multi-frequency high-isolation millimeter-wave phased array antenna according to claim 1, characterized in that: The shapes of the first metal strip and the second metal strip are π-shape, n-shape, H-shape, L-shape, M-shape, double T-shape, T-shape or triple T-shape.

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