Low side lobe envelope wide angle scanning co-boresight phased array antenna

Abstract

The application discloses a low-side-lobe envelope wide-angle scanning co-boresight phased array antenna and belongs to the technical field of phased array antennas. The antenna comprises a metal floor, a plurality of brick-type horizontal polarization linear arrays arranged at equal intervals along an X-axis direction, a plurality of brick-type vertical polarization linear arrays arranged at equal intervals along a Y-axis direction and a plurality of brick-type decoupling linear arrays arranged at equal intervals along the Y-axis direction. The brick-type horizontal polarization linear arrays and the brick-type vertical polarization linear arrays are arranged orthogonally to each other, and the brick-type decoupling linear arrays are inserted between adjacent brick-type vertical polarization linear arrays to suppress mutual coupling interference between the brick-type horizontal polarization linear arrays and ensure consistency of an antenna radiation environment. The phase centers of the vertical polarization antenna units and the decoupling units are located at the midpoint positions of phase centers of adjacent two horizontal polarization units, the periodic coupling condition is broken, and the coupling between antenna units of different frequency bands is eliminated. The application has the advantages of dual-frequency compatibility, miniaturization, a large beam scanning range and a low scanning side-lobe level envelope.

Description

Technical Field

[0001] The present invention belongs to the technical field of phased array antennas, and in particular relates to a low-sidelobe envelope wide-angle scanning common-aperture phased array antenna. Background Art

[0002] Multifunctional composite radar systems require the simultaneous deployment of multiple active phased array antennas operating in different frequency bands and polarization modes. However, with separate apertures, the simultaneous deployment of multiple antennas would occupy radar space, severely hindering radar miniaturization. To overcome electromagnetic interference and improve radar accuracy within the upper space, common-aperture phased array antennas are a well-suited candidate. They can effectively reduce the number of antennas and improve aperture utilization, thereby achieving an integrated multi-frequency and multi-polarization solution.

[0003] When existing co-aperture phased array antennas perform beam scanning, the coupling between antenna units in different frequency bands causes errors in the antenna radiation phase, resulting in abnormal side lobes during scanning. These side lobes cannot be suppressed through weighted shaping, and the radar's anti-interference capability cannot be improved.

[0004] At the same time, due to the interference of surface waves guided by the medium, the antenna cannot radiate electromagnetic waves at a specific scanning angle, resulting in the radar being unable to achieve wide-angle scanning. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a low sidelobe envelope wide-angle scanning common-aperture phased array antenna, which has the advantages of a large beam scanning range and a low scanning sidelobe level envelope.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A low-sidelobe envelope wide-angle scanning co-aperture phased array antenna, comprising: a metal floor, a plurality of brick-type horizontally polarized linear arrays arranged in parallel at equal intervals along the X-axis, a plurality of brick-type vertically polarized linear arrays arranged in parallel at equal intervals along the Y-axis, and a plurality of brick-type decoupling linear arrays arranged in parallel at equal intervals along the Y-axis;

[0008] The brick-type horizontal polarization array spacing is 0.45~0.52λ H ,λ H is the free space wavelength corresponding to the center operating frequency of the horizontally polarized antenna unit; the brick-type horizontally polarized linear array is composed of multiple horizontally polarized antenna units with the same structure and arranged at equal intervals along the Y axis, and the phase center spacing between adjacent horizontally polarized antenna units is 0.45~0.52λ H ;

[0009] The brick-type vertical polarization array spacing is 0.45~0.52λ L, and placed orthogonally with the brick-type horizontal polarization linear array, λ L is the free space wavelength corresponding to the center operating frequency of the vertically polarized antenna unit; the brick-type vertically polarized linear array is composed of multiple vertically polarized antenna units with the same structure and arranged at equal intervals along the X axis, and the phase center spacing between adjacent vertically polarized antenna units is 0.45~0.52λ L , and the phase center of the vertically polarized antenna unit is located at the midpoint of the phase centers of the two adjacent horizontally polarized units;

[0010] The brick-type decoupling array is located at the center of the adjacent brick-type vertical polarization array and is also placed orthogonally with the brick-type horizontal polarization array. The brick-type decoupling array is composed of multiple decoupling units with the same structure and arranged at equal intervals along the X axis. The phase center spacing between adjacent decoupling units is 0.45~0.52λ L ;

[0011] The metal floor is perpendicular to the Z axis and is placed at the bottom of the brick-type horizontal polarization linear array, the brick-type vertical polarization linear array, and the brick-type decoupling linear array.

[0012] Furthermore, in the brick-type horizontal polarization linear array, first slots opening upward are provided between adjacent units, and in the brick-type vertical polarization linear array and the brick-type decoupling linear array, second slots opening downward are provided between adjacent units; the first slots and the second slots engage with each other, so that the brick-type horizontal polarization linear array is orthogonally arranged to the brick-type vertical polarization linear array and the brick-type decoupling linear array;

[0013] The metal floor is provided with a plurality of slots, and the bottoms of the brick-type horizontal polarization linear array, brick-type vertical polarization linear array, and brick-type decoupling linear array are provided with a plurality of protrusions matching the shapes of the slots so as to be inserted downward into the corresponding slots.

[0014] Furthermore, λ H and λ L The ratio is 1:2~1:2.5.

[0015] Furthermore, the horizontally polarized antenna unit comprises: a horizontally polarized dielectric substrate, a horizontally polarized electric dipole, a horizontally polarized stripline feed balun, and a horizontally polarized bottom metal patch;

[0016] The horizontally polarized electric dipole comprises a first horizontally polarized electric dipole arm provided on the front surface of the horizontally polarized dielectric substrate and a second horizontally polarized electric dipole arm provided on the back surface thereof, wherein the first horizontally polarized electric dipole arm and the second horizontally polarized electric dipole arm have the same structure;

[0017] The horizontally polarized stripline feeding balun is arranged in the middle layer of the horizontally polarized dielectric substrate, and provides differential mode feeding to the horizontally polarized electric dipole and realizes impedance matching by electromagnetic coupling;

[0018] The horizontally polarized bottom metal patch is arranged on the front and back of the horizontally polarized dielectric substrate and is located below the horizontally polarized electric dipole. The upper side is connected to the horizontally polarized electric dipole and the lower side is connected to the metal floor.

[0019] Furthermore, the vertically polarized antenna unit comprises: a vertically polarized dielectric substrate, a vertically polarized electric dipole, a vertically polarized stripline feed balun, and a vertically polarized bottom metal patch;

[0020] The vertically polarized electric dipole comprises a first vertically polarized electric dipole arm provided on the front surface of the vertically polarized dielectric substrate and a second vertically polarized electric dipole arm provided on the back surface thereof, wherein the first vertically polarized electric dipole arm and the second vertically polarized electric dipole arm have the same structure;

[0021] The vertically polarized stripline feeding balun is arranged in the middle layer of the vertically polarized dielectric substrate, and provides differential mode feeding to the vertically polarized electric dipole and realizes impedance matching by electromagnetic coupling;

[0022] The vertical polarization bottom metal patch is arranged on the front and back of the vertical polarization dielectric substrate and is located below the vertical polarization electric dipole. The upper side is connected to the vertical polarization electric dipole and the lower side is connected to the metal floor.

[0023] Furthermore, the decoupling unit includes a decoupling unit dielectric substrate, a decoupling metal patch, and a decoupling bottom metal patch;

[0024] The decoupling metal patch includes a " " shaped metal patch, and " A rectangular opening is provided in the middle of the horizontal branch of the ""-shaped metal patch, and a small rectangular patch is connected to the upper side of the opening;

[0025] The decoupling bottom metal patch is arranged on the front and back of the decoupling unit dielectric substrate and is located below the decoupling metal patch. The upper side is connected to the decoupling metal patch and the lower side is connected to the metal floor.

[0026] Based on the above technical solution, the beneficial effects of the present invention are:

[0027] The present invention provides a low-sidelobe envelope, wide-angle scanning, co-aperture phased array antenna. In this antenna, brick-type horizontally polarized linear arrays and brick-type vertically polarized linear arrays are arranged orthogonally to achieve electromagnetic wave radiation with orthogonal polarizations in two different frequency bands. By inserting a brick-type decoupling linear array between adjacent brick-type vertically polarized linear arrays, the mutual coupling interference between the brick-type horizontally polarized linear arrays is suppressed, ensuring the consistency of the antenna radiation environment. Furthermore, by locating the phase centers of the vertically polarized antenna unit and the decoupling unit at the midpoint of the phase centers of two adjacent horizontally polarized units along the Y-axis, the periodic coupling condition is broken, eliminating coupling between antenna units in different frequency bands. Ultimately, the present invention achieves the advantages of dual-band compatibility, miniaturization, a large beam scanning range, and a low scanning sidelobe level envelope. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1. Exploded diagram of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna structure in the embodiment.

[0029] Figure 2 Schematic diagram of the horizontally polarized linear array structure of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0030] Figure 3 Schematic diagram of the vertically polarized linear array structure of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0031] Figure 4 Schematic diagram of the decoupled linear array structure of a low sidelobe envelope wide-angle scanning common-aperture phased array antenna in an embodiment.

[0032] Figure 5 This is the E-plane scanning pattern of the horizontally polarized antenna of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0033] Figure 6 : This is the H-plane scanning pattern of the horizontally polarized antenna of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0034] Figure 7 : This is the E-plane scanning pattern of the vertically polarized antenna of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0035] Figure 8 : This is the H-plane scanning pattern of the horizontally polarized antenna of the low sidelobe envelope wide-angle scanning common-aperture phased array antenna in the embodiment.

[0036] Description of the reference numerals: 1. metal floor, 101. slot;

[0037] 2. Brick-type horizontally polarized linear array, 200. Horizontally polarized dielectric substrate, 201. Horizontally polarized electric dipole, 202. Horizontally polarized bottom metal patch, 203. Horizontally polarized stripline feed balun, 204. First card slot, 205. First protrusion structure;

[0038] 3. Brick-type vertically polarized linear array, 300. Vertically polarized dielectric substrate, 301. Vertically polarized electric dipole, 302. Vertically polarized bottom metal patch, 303. Vertically polarized stripline feed balun, 304. Second slot for vertically polarized antenna unit, 305. Second raised structure;

[0039] 4. Brick-type decoupling linear array, 400. Decoupling unit dielectric substrate, 401. Decoupling metal patch, 402. Decoupling bottom metal patch, 404. Second card slot of the decoupling unit, 405. Third protrusion structure. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0041] This embodiment provides a low sidelobe envelope wide angle scanning common aperture phased array antenna, such as Figure 1 As shown, it includes: a metal floor, multiple groups of brick-type horizontal polarization linear arrays arranged in parallel with equal spacing along the X-axis, multiple groups of brick-type vertical polarization linear arrays arranged in parallel with equal spacing along the Y-axis, and multiple brick-type decoupling linear arrays arranged in parallel with equal spacing along the Y-axis.

[0042] The metal floor is perpendicular to the Z axis and is placed at the bottom of the brick-type horizontal polarization linear array, the brick-type vertical polarization linear array, and the brick-type decoupling linear array.

[0043] Several slots are provided on the metal floor, and the bottoms of the brick-type horizontal polarization linear array, the brick-type vertical polarization linear array, and the brick-type decoupling linear array are respectively provided with several first protrusion structures, second protrusion structures, and third protrusion structures that match the shapes of the slots, so that they can be inserted downward into the corresponding slots to achieve relative position fixation.

[0044] The central operating frequency of the brick-type horizontally polarized linear array is 32 GHz, and the spacing between adjacent linear arrays is 4.7 mm.

[0045] The brick-type horizontally polarized linear array consists of eight horizontally polarized antenna units with the same structure and arranged at equal intervals along the Y axis. The period of the horizontally polarized antenna units is 4.7 mm, and the phase center spacing between adjacent horizontally polarized antenna units is 4.7 mm.

[0046] The horizontally polarized antenna unit, such as Figure 2As shown, it includes: a horizontally polarized dielectric substrate, a horizontally polarized electric dipole, a horizontally polarized stripline fed balun, and a horizontally polarized bottom metal patch.

[0047] The horizontally polarized electric dipole includes a first horizontally polarized electric dipole arm arranged on the front side of the horizontally polarized dielectric substrate and a second horizontally polarized electric dipole arm on the back side. The first horizontally polarized electric dipole arm and the second horizontally polarized electric dipole arm have the same structure, both consisting of a rectangular patch and two mirror-symmetrical inverted "L"-shaped metal patches arranged above the rectangular patch.

[0048] The horizontally polarized bottom metal patch covers the lower part of the front and back sides of the horizontally polarized dielectric substrate, is connected to the horizontally polarized electric dipole on the upper side, and is connected to the metal floor on the lower side.

[0049] The horizontally polarized stripline-fed balun is located in the middle layer of the horizontally polarized dielectric substrate and provides differential-mode feeding and impedance matching to the horizontally polarized electric dipole via electromagnetic coupling. The input of the horizontally polarized stripline-fed balun is located at the bottom of the horizontally polarized antenna unit, and a through-hole is provided in the metal floor corresponding to the input to facilitate connection with the feed structure. The line width of the horizontally polarized stripline-fed balun decreases in a stepwise manner from the input to the open-circuit end, and the end undergoes four 90-degree bends, forming a hook shape.

[0050] The brick-type vertical polarization linear array and the brick-type horizontal polarization linear array are placed orthogonally and cross-wise, with a central operating frequency of 14 GHz and a spacing between adjacent linear arrays of 9.4 mm.

[0051] The brick-type vertically polarized linear array consists of four vertically polarized antenna units with the same structure and arranged at equal intervals along the X-axis. The period of the vertically polarized antenna units is 9.4 mm, the phase center spacing between adjacent vertically polarized antenna units is 9.4 mm, and the phase center of the vertically polarized antenna unit is located at the midpoint of the phase centers of two adjacent horizontally polarized units.

[0052] The vertically polarized antenna unit, such as Figure 3 As shown, it includes: a horizontally polarized dielectric substrate, a vertically polarized electric dipole, a vertically polarized stripline fed balun, and a vertically polarized bottom metal patch.

[0053] The vertically polarized electric dipole includes a first vertically polarized electric dipole arm disposed on the front surface of a horizontally polarized dielectric substrate, and a second vertically polarized electric dipole arm disposed on the back surface. The first vertically polarized electric dipole arm and the second vertically polarized electric dipole arm have the same structure. Specifically, the vertically polarized electric dipole arm includes a first metal patch and a second metal patch that are mirror-symmetrical. The first metal patch and the second metal patch are mainly inverted "L"-shaped metal patches, wherein the lower half of the vertical branches are bent outward.

[0054] The vertically polarized bottom metal patch covers the lower part of the front and back sides of the vertically polarized dielectric substrate, is connected to the vertically polarized electric dipole on the upper side, and is connected to the metal floor on the lower side.

[0055] The vertically polarized stripline-fed balun is located in the middle layer of the vertically polarized dielectric substrate and provides differential-mode feeding and impedance matching to the vertically polarized electric dipole via electromagnetic coupling. The input of the vertically polarized stripline-fed balun is located at the bottom of the vertically polarized antenna unit, and a through-hole is provided on the metal floor corresponding to the input to facilitate connection with the feed structure. The line width of the vertically polarized stripline-fed balun decreases in a stepwise manner from the input to the open-circuit end, increasing at the end. The vertically polarized stripline-fed balun undergoes multiple 90-degree bends, also forming a hook shape.

[0056] The brick-type decoupling array is located at the center of the adjacent brick-type vertically polarized linear array and is also placed orthogonally across the brick-type horizontally polarized linear array. The brick-type decoupling array consists of four decoupling units with the same structure and arranged at equal intervals along the X-axis. The period of the decoupling units is 9.4 mm, and the phase center spacing between adjacent decoupling units is 9.4 mm.

[0057] The decoupling unit includes a decoupling unit dielectric substrate, a decoupling metal patch, and a decoupling bottom metal patch;

[0058] The decoupling metal patch includes a " " shaped metal patch, and " A rectangular opening is provided in the middle of the horizontal branch of the "-shaped metal patch, the upper side of the opening is connected to the small rectangular patch, and circular protrusions are provided at the two top corners of the upper side of the small rectangular patch.

[0059] The decoupling bottom metal patch covers the front and back lower parts of the decoupling unit dielectric substrate, with its upper side connected to the decoupling metal patch and its lower side connected to the metal floor.

[0060] In the brick-type horizontal polarization linear array, a first slot opening upward is provided between adjacent units, and in the brick-type vertical polarization linear array and the brick-type decoupling linear array, a second slot opening downward is provided between adjacent units; the first slot and the second slot engage with each other, so that the brick-type horizontal polarization linear array is orthogonally arranged to the brick-type vertical polarization linear array and the brick-type decoupling linear array.

[0061] The co-aperture phased array antenna in this embodiment generates side lobes during beam scanning that cannot be suppressed using weighted shaping methods. Therefore, a decoupling unit is introduced into the antenna, and a decoupling metal patch structure is specially designed to effectively suppress the coupling between the high-frequency horizontally polarized antenna and the low-frequency vertically polarized antenna. At the same time, the phase center of the vertically polarized antenna unit is located at the midpoint of the phase centers of two adjacent horizontally polarized units along the Y-axis. No vertically polarized antenna unit is set between the other group of horizontally polarized antenna units, breaking the local symmetry of the antenna structure to optimize the scanning sidelobe performance.

[0062] In the horizontal polarization antenna unit and the vertical polarization antenna unit, a symmetrical electric dipole antenna structure is adopted, and a broadband stripline feeding balun is used to realize differential balanced feeding of the electric dipole antenna unit. In the decoupling unit, the present invention adopts a main body of " The shaped metal patch decoupling structure reduces the equivalent dielectric constant of the decoupling unit dielectric substrate, optimizes the radiation phase error, and thus optimizes the scanning sidelobe performance.

[0063] The dual-frequency low sidelobe wide angle common aperture phased array antenna in this embodiment is simulated and tested. Figure 5 The following is the E-plane scanning pattern of the center frequency of the dual-frequency low sidelobe wide-angle scanning common aperture phased array horizontal polarization antenna. Figure 6 The figure shows the H-plane scanning pattern of the center frequency of the dual-frequency low sidelobe wide-angle scanning common aperture phased array horizontal polarization antenna. Figure 7 The following is the E-plane scanning pattern of the center frequency of the dual-frequency low sidelobe wide-angle scanning common aperture phased array vertically polarized antenna. Figure 8 The figure shows the H-plane scanning pattern of the center frequency of the dual-frequency, low sidelobe, wide-angle scanning, co-aperture phased array vertically polarized antenna. Figures 5-8 It can be seen that the low-frequency scanning angle is ±50°, the high-frequency scanning angle is ±45°, the sidelobe level in the low-frequency scanning range is lower than -28dB, and the sidelobe level in the high-frequency scanning range is lower than -28dB.

[0064] In summary, the low sidelobe envelope, wide-angle scanning co-aperture phased array antenna proposed in the present invention has the advantages of dual-frequency compatibility, miniaturized design, large beam scanning range and low scanning sidelobe level envelope. Its low-frequency operating bandwidth is 25%, the high-frequency operating bandwidth is 11.7%, the low-frequency scanning angle is ±50°, the high-frequency scanning angle is ±45°, the sidelobe level in the low-frequency scanning range is lower than -28dB, and the sidelobe level in the high-frequency scanning range is lower than -28dB.

[0065] The above merely illustrates the specific implementation of the present application, and any feature disclosed in the specification can be replaced by other equivalent or similar purpose alternative features unless specifically described; all features disclosed, or steps in all methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0066] The application discloses a low-sidelobe envelope wide-angle scanning co-boresight phased array antenna and belongs to the technical field of phased array antennas. The antenna comprises a metal floor, a plurality of brick-type horizontal polarization linear arrays arranged at equal intervals along an X-axis direction, a plurality of brick-type vertical polarization linear arrays arranged at equal intervals along a Y-axis direction and a plurality of brick-type decoupling linear arrays arranged at equal intervals along the Y-axis direction. The brick-type horizontal polarization linear arrays and the brick-type vertical polarization linear arrays are arranged orthogonally, and the brick-type decoupling linear arrays are inserted between adjacent brick-type vertical polarization linear arrays to suppress mutual coupling interference between the brick-type horizontal polarization linear arrays and ensure consistency of an antenna radiation environment. The phase centers of the vertical polarization antenna units and the decoupling units are located at the midpoint positions of phase centers of adjacent two horizontal polarization units, the periodic coupling condition is broken, and the coupling between antenna units of different frequency bands is eliminated. The application realizes the advantages of dual-frequency compatibility, miniaturization, a large beam scanning range and a low scanning sidelobe level envelope.

Claims

1. A low sidelobe envelope wide angle scanning common aperture phased array antenna, characterized in that: include: Metal floor, multiple brick-type horizontally polarized linear arrays arranged in parallel with equal spacing along the X-axis, multiple brick-type vertically polarized linear arrays arranged in parallel with equal spacing along the Y-axis, and multiple brick-type decoupling linear arrays arranged in parallel with equal spacing along the Y-axis; The brick-type horizontal polarization array spacing is 0.45~0.52λ H ,λ H is the free space wavelength corresponding to the center operating frequency of the horizontally polarized antenna unit; the brick-type horizontally polarized linear array is composed of multiple horizontally polarized antenna units with the same structure and arranged at equal intervals along the Y axis, and the phase center spacing between adjacent horizontally polarized antenna units is 0.45~0.52λ H ; The brick-type vertical polarization array spacing is 0.45~0.52λ L , and placed orthogonally with the brick-type horizontal polarization linear array, λ L is the free space wavelength corresponding to the center operating frequency of the vertically polarized antenna unit; the brick-type vertically polarized linear array is composed of multiple vertically polarized antenna units with the same structure and arranged at equal intervals along the X axis, and the phase center spacing between adjacent vertically polarized antenna units is 0.45~0.52λ L , and the phase center of the vertically polarized antenna unit is located at the midpoint of the phase centers of the two adjacent horizontally polarized units; The brick-type decoupling array is located at the center of the adjacent brick-type vertical polarization array and is also placed orthogonally with the brick-type horizontal polarization array. The brick-type decoupling array is composed of multiple decoupling units with the same structure and arranged at equal intervals along the X axis. The phase center spacing between adjacent decoupling units is 0.45~0.52λ L ; The metal floor is perpendicular to the Z axis and is placed at the bottom of the brick-type horizontal polarization linear array, the brick-type vertical polarization linear array, and the brick-type decoupling linear array.

2. The low sidelobe envelope wide angle scanning common aperture phased array antenna according to claim 1, characterized in that: In the brick-type horizontal polarization linear array, a first slot opening upward is provided between adjacent units, and in the brick-type vertical polarization linear array and the brick-type decoupling linear array, a second slot opening downward is provided between adjacent units; the first slot and the second slot engage with each other, so that the brick-type horizontal polarization linear array is orthogonally arranged to the brick-type vertical polarization linear array and the brick-type decoupling linear array; The metal floor is provided with a plurality of slots, and the bottoms of the brick-type horizontal polarization linear array, brick-type vertical polarization linear array, and brick-type decoupling linear array are provided with a plurality of protrusions matching the shapes of the slots so as to be inserted downward into the corresponding slots.

3. The low sidelobe envelope wide angle scanning common aperture phased array antenna according to claim 2, characterized in that: λ H and λ L The ratio is 1:2~1:2.

5.

4. The low sidelobe envelope wide angle scanning common aperture phased array antenna according to claim 3, characterized in that: The decoupling unit includes a decoupling unit dielectric substrate, a decoupling metal patch, and a decoupling bottom metal patch; Wherein, the decoupling metal patch includes " " shaped metal patch, and" A rectangular opening is provided in the middle of the horizontal branch of the ""-shaped metal patch, and a small rectangular patch is connected to the upper side of the opening; The decoupling bottom metal patch is arranged on the front and back of the decoupling unit dielectric substrate and is located below the decoupling metal patch. The upper side is connected to the decoupling metal patch and the lower side is connected to the metal floor.

5. The low sidelobe envelope wide angle scanning common aperture phased array antenna according to claim 4, characterized in that: The horizontally polarized antenna unit comprises: a horizontally polarized dielectric substrate, a horizontally polarized electric dipole, a horizontally polarized stripline feed balun, and a horizontally polarized bottom metal patch; The horizontally polarized electric dipole comprises a first horizontally polarized electric dipole arm provided on the front surface of the horizontally polarized dielectric substrate and a second horizontally polarized electric dipole arm provided on the back surface thereof, wherein the first horizontally polarized electric dipole arm and the second horizontally polarized electric dipole arm have the same structure; The horizontally polarized stripline feeding balun is arranged in the middle layer of the horizontally polarized dielectric substrate, and provides differential mode feeding to the horizontally polarized electric dipole and realizes impedance matching by electromagnetic coupling; The horizontally polarized bottom metal patch is arranged on the front and back of the horizontally polarized dielectric substrate and is located below the horizontally polarized electric dipole. The upper side is connected to the horizontally polarized electric dipole and the lower side is connected to the metal floor.

6. The low sidelobe envelope wide angle scanning common aperture phased array antenna according to claim 4, characterized in that: The vertically polarized antenna unit comprises: a vertically polarized dielectric substrate, a vertically polarized electric dipole, a vertically polarized stripline feed balun, and a vertically polarized bottom metal patch; The vertically polarized electric dipole comprises a first vertically polarized electric dipole arm provided on the front surface of the vertically polarized dielectric substrate and a second vertically polarized electric dipole arm provided on the back surface thereof, wherein the first vertically polarized electric dipole arm and the second vertically polarized electric dipole arm have the same structure; The vertically polarized stripline feeding balun is arranged in the middle layer of the vertically polarized dielectric substrate, and provides differential mode feeding to the vertically polarized electric dipole and realizes impedance matching by electromagnetic coupling; The vertical polarization bottom metal patch is arranged on the front and back of the vertical polarization dielectric substrate and is located below the vertical polarization electric dipole. The upper side is connected to the vertical polarization electric dipole and the lower side is connected to the metal floor.

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