45-degree low-sidelobe flat plate array antenna

Abstract

The utility model relates to a flat plate array antenna technology, and especially relates to a 45-degree low-sidelobe flat plate array antenna. The antenna comprises a radiation layer, a back cavity layer and a feed layer. A radiation layer is laminated above a back cavity layer, the back cavity layer is laminated above a feed layer, and the feed layer is used for outputting 4 * 4 paths of TE10 mode signals; the radiation layer is provided with 4 * 4 input ends and 4 * 4 output ends, the 4 * 4 input ends of the radiation layer are used for accessing 4 * 4 paths of TE10 mode signals output by the feed layer in a one-to-one correspondence manner through transfer of the back cavity layer, and the 4 * 4 output ends of the radiation layer are used for radiating the 4 * 4 paths of TE10 mode signals output by the feed layer to a free space in a one-to-one correspondence manner. The low side lobe flat plate array antenna is simple in structure, low in cost, easy to realize batch production, wide in frequency bandwidth and high in efficiency.

Description

Technical Field

[0001] This utility model relates to planar array antenna technology, and more particularly to a 45-degree low sidelobe planar array antenna. Background Technology

[0002] In recent years, with the increasing demands for radar anti-jamming and the development of modern electronics industry, antennas need to have low or low-order sidelobes. Traditional waveguide slot array antennas currently employ two main approaches to reduce sidelobes. The first approach adjusts the power distribution ratio of the feed layer to regulate the energy distribution of the radiating layer, thereby reducing sidelobes. However, this approach always results in a wider main lobe and a decrease in gain, failing to guarantee a narrow main lobe without sacrificing gain while achieving extremely low sidelobes. The second approach reduces sidelobes by adding a polarization layer above the radiating layer. Adding a polarization layer rotates the electric field polarization direction of the radiating layer, achieving low sidelobes. However, adding a polarization layer during mass production increases the antenna cost by 20%.

[0003] Chinese patent application CN201710429885.0 discloses a waveguide slot array antenna, which includes an electromagnetic radiation module and an energy supply module arranged sequentially in the vertical direction. The electromagnetic radiation module is constructed using a multi-level coupling topology, specifically consisting of a composite layered structure composed of four independent radiators stacked sequentially from bottom to top. This device maintains the technical advantages of wide frequency domain characteristics and high directivity while also possessing secondary radiation suppression capabilities. Analysis reveals the following areas for improvement: First, the multi-level configuration of the radiation module limits the integration of the manufacturing process, making single-piece fabrication impossible and increasing the complexity of the assembly process, which is detrimental to large-scale manufacturing. Second, the energy coupling mechanism uses a four-way topology design, whose bandwidth extension capability is limited by the cavity resonance characteristics, making it difficult to meet the requirements of ultra-wideband communication. Third, the secondary lobe suppression mechanism relies on the phase perturbation design of the radiator array; this multi-level phase shifting operation causes energy loss, leading to a decrease in radiation efficiency. Utility Model Content

[0004] This invention addresses the problems of complex timer design, cumbersome operation, and inconvenient portability in existing technologies by providing a 45-degree low sidelobe planar array antenna.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0006] A 45-degree low-sidelobe planar array antenna includes a radiating layer, a cavity back layer, and a feed layer;

[0007] The radiation layer is stacked on top of the cavity layer, the cavity layer is stacked on top of the feed layer, and the feed layer is used to output 4*4 TE10 mode signals.

[0008] The radiating layer has 4*4 input terminals and 4*4 output terminals. The 4*4 input terminals of the radiating layer are used to connect to the 4*4 TE10 mode signals output by the feed layer through the back cavity layer. The 4*4 output terminals of the radiating layer are used to radiate the 4*4 TE10 mode signals output by the feed layer into free space.

[0009] Preferably, the radiating layer 1 comprises 4*4 radiating elements, which together form a radiating array. The radiating array is formed by distributing the 4*4 radiating elements in a 4x4 grid, with the center-to-center distance between adjacent radiating elements in the same row being 0.76λ, and the center-to-center distance between adjacent radiating elements in the same column being 0.76λ, where λ = c / f, c is the wave velocity (c = 3*10^8 m / s), and f is the center operating frequency of the low sidelobe planar array antenna.

[0010] The radiation unit includes a first radiation component and a second radiation component, which are arranged at intervals. After the first radiation component is translated backward by 0.76λ, it will overlap with the second radiation component. The center-to-center distance between the first radiation component and the second radiation component is 0.76λ.

[0011] As a preferred embodiment: the first radiation component includes a first rectangular block of radiation layer and a first rectangular strip of radiation layer, the first rectangular block of radiation layer and the first rectangular strip of radiation layer are arranged in order from top to bottom, and the centers of the first rectangular block of radiation layer and the first rectangular strip of radiation layer are located on the same straight line;

[0012] The distance between the front end face and the rear end face of the first rectangular block of the radiating layer is 0.55λ, the distance between the left end face and the right end face of the first rectangular block of the radiating layer is 0.43λ, and the distance between the upper end face and the lower end face of the first rectangular block of the radiating layer is 0.18λ. If the first rectangular block of the radiating layer is rotated 45 degrees counterclockwise around its center line, the plane containing its front end face will be parallel to the plane containing the front end face of the polygonal parallel plate 7. The upper end face of the first rectangular strip of the radiating layer is integrally formed and connected to the lower end face of the first rectangular block of the radiating layer, and the two are in a close fit. The front end face of the first rectangular strip of the radiating layer is on the same plane as the front end face of the first rectangular block of the radiating layer. The rear end face of the first rectangular strip of the radiating layer is on the same plane as the rear end face of the first rectangular block of the radiating layer. The distance between the front end face and the rear end face of the first rectangular strip of the radiating layer is 0.55λ. The distance between the left end face and the right end face of the first rectangular strip of the radiating layer is 0.19λ. The distance between the upper end face and the lower end face of the first rectangular strip of the radiating layer is 0.09λ. The plane containing the left end face of the first rectangular strip of the radiating layer and the left end face of the first rectangular block is equal to the plane containing the right end face of the first rectangular strip of the radiating layer and the right end face of the first rectangular block of the radiating layer. The lower end face of the first rectangular strip of the radiating layer is integrally formed and connected to the upper end face of the polygonal parallel plate, and the two are in a fitted state.

[0013] As a preferred embodiment: the back cavity layer 2 is provided with a first back cavity layer, a second back cavity layer and a third back cavity layer in sequence; a polygonal parallel plate is provided on the first back cavity layer; a first rectangular block, a first rectangular strip and a second rectangular strip are formed on the second back cavity layer; and a second rectangular block and a third rectangular block are provided on the third back cavity layer.

[0014] Preferably, the polygonal parallel plate includes a second rectangular block, a third rectangular block, a first right-angled triangular block, a fourth rectangular block, and a second right-angled triangular block.

[0015] The top faces of the second rectangular block, the third rectangular block, the first right-angled triangular block, the fourth rectangular block, and the second right-angled triangular block of the polygonal parallel plate are all on the same plane.

[0016] The lower faces of the second rectangular block, the third rectangular block, the first right-angled triangle block, the fourth rectangular block, and the second right-angled triangle block of the polygonal parallel plate are all on the same plane;

[0017] The distance between the upper and lower faces of the second rectangular block, the third rectangular block, the first right-angled triangle block, the fourth rectangular block, and the second right-angled triangle block of the polygonal parallel plate is 0.11λ.

[0018] The front end face of the second rectangular block of the polygonal parallel plate has a length of 0.54λ along the left-right direction, and the left end face of the second rectangular block of the polygonal parallel plate has a length of 0.56λ along the front-back direction.

[0019] The front end face of the third rectangular block of the polygonal parallel plate has a length of 0.16 in the left-right direction, and the left end face of the third rectangular block of the polygonal parallel plate has a length of 0.38λ in the front-back direction. The rear end face of the third rectangular block of the polygonal parallel plate is connected to the front end face of the second rectangular block of the polygonal parallel plate, and the two are in a fitted state.

[0020] The end face of the first right-angled triangle block of the first polygonal parallel plate is connected to the left end face of the third rectangular block of the polygonal parallel plate and the two are in a close fit. The length of the end face of the first right-angled triangle block of the first polygonal parallel plate along the front-back direction is equal to the length of the left end face of the third rectangular block of the polygonal parallel plate along the front-back direction.

[0021] The end face of the second right-angled side of the first right-angled triangle block of the polygonal parallel plate is connected to the front face of the second rectangular block of the polygonal parallel plate and the two are in a close contact state. The length of the end face of the second right-angled side of the second right-angled triangle block of the polygonal parallel plate in the left-right direction is equal to 0.38λ. The sum of the length of the end face of the second right-angled triangle block of the polygonal parallel plate in the left-right direction and the length of the rear face of the third rectangular block of the polygonal parallel plate in the left-right direction is equal to the length of the front face of the third rectangular block of the polygonal parallel plate in the left-right direction.

[0022] The front end face of the fourth rectangular block of the polygonal parallel plate has a length of 0.16λ in the left-right direction, and the left end face of the fourth rectangular block of the polygonal parallel plate has a length of 0.38λ in the front-back direction. The front end face of the fourth rectangular block of the polygonal parallel plate is connected to the rear end face of the second rectangular block of the polygonal parallel plate, and the two are in a fitted state.

[0023] The end face containing the first right-angled side of the second right-angled triangle block of the polygonal parallel plate is connected to the right end face of the fourth rectangular block of the polygonal parallel plate, and the two are in a close fit. The length of the end face containing the first right-angled side of the second right-angled triangle block of the polygonal parallel plate along the front-back direction is equal to the length of the right end face of the fourth rectangular block of the polygonal parallel plate along the front-back direction. The end face containing the second right-angled side of the second right-angled triangle block of the polygonal parallel plate is connected to the rear end face of the second rectangular block of the polygonal parallel plate, and the two are in a close fit. The length of the end face containing the second right-angled side of the second right-angled triangle block of the polygonal parallel plate along the left-right direction is equal to 0.38λ. The sum of the length of the end face containing the second right-angled side of the second right-angled triangle block of the polygonal parallel plate along the left-right direction and the length of the front end face of the fourth rectangular block of the polygonal parallel plate along the left-right direction is equal to the length of the rear end face of the second rectangular block of the polygonal parallel plate along the left-right direction.

[0024] The front end face of the first rectangular strip of the polygonal parallel plate is on the same plane as the front end face of the first rectangular block of the polygonal parallel plate. The left end face of the first rectangular strip of the polygonal parallel plate is on the same plane as the left end face of the first rectangular block of the polygonal parallel plate. The lower end face of the first rectangular strip of the polygonal parallel plate is connected to the upper end face of the first rectangular block of the polygonal parallel plate, and the two are in a close fit. The distance between the front end face and the rear end face of the first rectangular strip of the polygonal parallel plate is 0.13λ, the distance between the left end face and the right end face of the first rectangular strip of the polygonal parallel plate is 0.56λ, and the distance between the upper end face and the lower end face of the first rectangular strip of the polygonal parallel plate is 0.1λ. The second rectangular strip of the polygonal parallel plate is symmetrical to the first rectangular strip of the polygonal parallel plate about the center line.

[0025] The front end face of the second rectangular strip of the polygonal parallel plate is on the same plane as the front end face of the first rectangular block of the polygonal parallel plate. The right end face of the second rectangular strip of the polygonal parallel plate is on the same plane as the right end face of the first rectangular block of the polygonal parallel plate. The lower end face of the second rectangular strip of the polygonal parallel plate is connected to the upper end face of the first rectangular block of the polygonal parallel plate, and the two are in contact. The distance between the front end face and the rear end face of the second rectangular strip of the polygonal parallel plate is 0.13λ, the distance between the left end face and the right end face of the second rectangular strip of the polygonal parallel plate is 0.56λ, and the distance between the upper end face and the lower end face of the second rectangular strip of the polygonal parallel plate is 0.1λ.

[0026] The second rectangular strip of the second polygonal parallel plate is symmetrical about the center line to the second rectangular strip of the first polygonal parallel plate.

[0027] The first rectangular block of the second back cavity layer is provided with two first rectangular openings of the second back cavity layer and two second rectangular openings of the second back cavity layer.

[0028] The distance from the front end face of the first rectangular opening in the second back cavity layer to the front end face of the first rectangular block in the second back cavity layer is 0.77λ; the distance from the rear end face of the first rectangular opening in the second back cavity layer to the rear end face of the first rectangular block in the second back cavity layer is 0.77λ; the distance between the front end face and the rear end face of the first rectangular opening in the second back cavity layer is 0.12λ; and the distance between the upper end face and the lower end face of the first rectangular opening in the second back cavity layer is 0.13λ.

[0029] The second rectangular opening in the second back cavity layer is symmetrical to the first rectangular opening in the first back cavity layer about the center line. The distance between the left end face of the second rectangular opening in the second back cavity layer and the left end face of the first rectangular block in the second back cavity layer is 0.6λ.

[0030] The distance between the right end face of the second rectangular opening in the second back cavity layer and the right end face of the first rectangular block in the second back cavity layer is 0.6λ; the distance between the front end face and the rear end face of the second rectangular opening in the second back cavity layer is 0.43λ; the distance between the left end face and the right end face of the second rectangular opening in the second back cavity layer is 0.1λ; and the distance between the upper end face and the lower end face of the second rectangular opening in the second back cavity layer is 0.13λ.

[0031] The second rectangular opening in the second back cavity layer is symmetrical to the first rectangular opening in the second back cavity layer about its centerline. The distance between the front end face and the rear end face of the second rectangular block in the second back cavity layer is 0.27λ, the distance between the left end face and the right end face of the second rectangular block in the second back cavity layer is 0.64λ, and the distance between the upper end face and the lower end face of the second rectangular block in the second back cavity layer is 0.22λ. The upper end face of the second rectangular block in the second back cavity layer is connected to the lower end face of the first rectangular block of the polygonal parallel plate and is in contact with it. In the combined state, the distance between the front end face of the second rectangular block of the second back cavity layer and the front end face of the first rectangular block of the polygonal parallel plate is 0.69λ; the distance between the rear end face of the second rectangular block of the polygonal parallel plate and the rear end face of the first rectangular block of the polygonal parallel plate is 0.69λ; the distance between the left end face of the second rectangular block of the polygonal parallel plate and the left end face of the first rectangular block of the polygonal parallel plate is 0.34λ; and the distance between the right end face of the second rectangular block of the polygonal parallel plate and the right end face of the first rectangular block of the polygonal parallel plate is 0.34λ.

[0032] The rear end face of the third rectangular block of the third back cavity layer 23 is connected to the front end face of the second rectangular block of the third back cavity layer 23, and the two are in a fitted state. The distance between the front end face and the rear end face of the third rectangular block of the third back cavity layer 23 is 0.2λ, the distance between the left end face and the right end face of the third rectangular block of the third back cavity layer 23 is 0.1λ, the distance between the upper end face and the lower end face of the third rectangular block of the third back cavity layer 23 is 0.08λ, and the distance between the upper end face of the third rectangular block of the third back cavity layer 23 and the upper end face of the second rectangular block 241 of the polygonal parallel plate is 0.04λ. The distance between the lower end face of the third rectangular block of the third back cavity layer 23 and the lower end face of the second rectangular block 241 of the polygonal parallel plate is 0.1λ. The distance between the left end face of the third rectangular block of the third back cavity layer 23 and the left end face of the second rectangular block 241 of the polygonal parallel plate is 0.27λ. The distance between the right end face of the third rectangular block of the third back cavity layer 23 and the right end face of the second rectangular block 241 of the polygonal parallel plate is 0.27λ. The second third rectangular block of the third back cavity layer 23 and the first third rectangular block of the third back cavity layer 23 are symmetrical about the second rectangular block of the third back cavity layer 23.

[0033] As a preferred option:

[0034] The power feed layer includes a power feed layer three-port converter, two power feed layer concave interfaces, and two power feed layer trapezoidal interfaces.

[0035] The feed layer three-port converter includes a first rectangular block of the feed layer, a first rectangular cavity of the feed layer, a second rectangular cavity of the feed layer, two third rectangular cavities of the feed layer, and two fourth rectangular cavities of the feed layer.

[0036] The distance between the front end face and the rear end face of the first rectangular block of the feed layer is 0.4λ, the distance between the left end face and the right end face of the first rectangular block of the feed layer is 0.62λ, and the distance between the top end face and the bottom end face of the first rectangular block of the feed layer is 0.22λ.

[0037] The distance between the front end face and the rear end face of the first rectangular cavity of the feed layer is 0.4λ, the distance between the left end face and the right end face of the first rectangular cavity of the feed layer is 0.44λ, the distance between the upper end face and the lower end face of the first rectangular cavity of the feed layer is 0.05λ, and the distance between the left end face of the first rectangular cavity of the feed layer and the left end face of the first rectangular block of the feed layer is equal to the distance between the right end face of the first rectangular cavity of the feed layer and the right end face of the first rectangular block of the feed layer.

[0038] The second rectangular cavity of the feed layer and the first rectangular cavity of the feed layer are arranged in order from bottom to top. The distance between the front end face and the rear end face of the second rectangular cavity is 0.07λ, the distance between the left end face and the right end face of the second rectangular cavity is 0.09λ, the distance between the upper end face and the lower end face of the second rectangular cavity is 0.06λ, the lower end face of the second rectangular cavity is on the same plane as the lower end face of the first rectangular cavity, and the distance between the left end face of the second rectangular cavity and the left end face of the first rectangular cavity is equal to the distance between the right end face of the second rectangular cavity and the right end face of the first rectangular cavity.

[0039] The distance between the front end face and the rear end face of the third rectangular cavity of the feed layer is 0.09λ, the distance between the left end face and the right end face of the third rectangular cavity of the feed layer is 0.04λ, and the distance between the upper end face and the lower end face of the third rectangular cavity of the feed layer is 0.06λ. The lower end face of the third rectangular cavity of the feed layer is on the same plane as the lower end face of the first rectangular cavity of the feed layer. The distance between the front end face of the third rectangular cavity of the feed layer and the front end face of the first rectangular cavity of the feed layer is equal to the distance between the rear end face of the third rectangular cavity of the feed layer and the rear end face of the first rectangular cavity of the feed layer. The left end face of the third rectangular cavity of the feed layer is connected to the left end face of the first rectangular cavity of the feed layer, and the two are in a fitted state.

[0040] The third rectangular cavity of the second feed layer is symmetrical to the third rectangular cavity of the first feed layer about the first rectangular cavity of the feed layer. The distance between the front end face and the rear end face of the fourth rectangular cavity of the feed layer is 0.09λ, and the distance between the left end face and the right end face of the fourth rectangular cavity of the feed layer is 0.09λ.

[0041] The distance between the upper and lower ends of the fourth rectangular cavity of the feed layer is 0.1λ. The distance between the front end of the fourth rectangular cavity and the front end of the first rectangular block of the feed layer is equal to the distance between the rear end of the fourth rectangular cavity and the rear end of the first rectangular block of the feed layer. The lower end of the fourth rectangular cavity and the lower end of the first rectangular block of the feed layer are in the same plane. The upper end of the fourth rectangular cavity and the upper end of the third rectangular cavity of the feed layer are in the same plane.

[0042] The fourth rectangular cavity of the second feed layer is symmetrical to the fourth rectangular cavity of the first feed layer about the first rectangular cavity of the feed layer.

[0043] The concave interface of the feed layer includes a second rectangular block and a fifth rectangular cavity. The distance between the front end face and the rear end face of the second rectangular block is 0.4λ, the distance between the left end face and the right end face is 0.13λ, and the distance between the upper end face and the lower end face is 0.22λ. The right end face of the second rectangular block is connected to the left end face of the first rectangular block and the two are in a fitted state. The upper end face of the second rectangular block is on the same plane as the upper end face of the first rectangular block, and the lower end face of the second rectangular block is on the same plane as the lower end face of the first rectangular block. The distance between the front end face and the rear end face of the fifth rectangular cavity is 0.09λ.

[0044] The distance between the left end face and the right end face of the fifth rectangular cavity of the feed layer is 0.13λ, the distance between the upper end face and the lower end face of the fifth rectangular cavity of the feed layer is 0.1λ, the lower end face of the fifth rectangular cavity of the feed layer is on the same plane as the lower end face of the second rectangular block of the feed layer, the distance between the front end face of the fifth rectangular cavity of the feed layer and the front end face of the second rectangular block is equal to the distance between the rear end face of the fifth rectangular cavity and the rear end face of the second rectangular block of the feed layer, and the second fifth rectangular cavity of the feed layer and the first fifth rectangular cavity of the feed layer are symmetrical about the first rectangular block of the feed layer.

[0045] The trapezoidal interface of the feed layer includes a third rectangular block, a fourth rectangular block, a sixth rectangular cavity, and a seventh rectangular cavity. The upper end face of the third rectangular block is on the same plane as the upper end face of the fourth rectangular block, the lower end face of the third rectangular block is on the same plane as the lower end face of the fourth rectangular block, the right end face of the third rectangular block is on the same plane as the right end face of the fourth rectangular block, the rear end face of the third rectangular block is connected to the front end face of the fourth rectangular block and the two are in a mating state, and the distance between the front end face and the rear end face of the third rectangular block is 0.22λ. The distance between the left and right ends of the third rectangular block of the feed layer is 0.66λ. The distance between the upper and lower ends of the third rectangular block of the feed layer is 0.22λ. The right end of the third rectangular block of the feed layer is connected to the right end of the second rectangular block of the feed layer, and the two are in a close fit. The distance between the front and rear ends of the fourth rectangular block of the feed layer is 0.18λ. The distance between the left and right ends of the fourth rectangular block of the feed layer is 0.47λ. The distance between the upper and lower ends of the fourth rectangular block of the feed layer is 0.22λ. The right end of the fourth rectangular block of the feed layer is connected to the right end of the second rectangular block of the feed layer, and the two are in a close fit. The sixth rectangular block of the feed layer... The distance between the front end face of the rectangular cavity and the front end face of the third rectangular block of the feed layer is equal to the distance between the rear end face of the sixth rectangular cavity of the feed layer and the rear end face of the fourth rectangular block of the feed layer. The distance between the front end face and the rear end face of the sixth rectangular cavity of the feed layer is 0.09λ. The distance between the left end face and the right end face of the sixth rectangular cavity of the feed layer is 0.3λ. The distance between the upper end face and the lower end face of the sixth rectangular cavity of the feed layer is 0.08λ. The lower end face of the sixth rectangular cavity of the feed layer is on the same plane as the lower end faces of the third and fourth rectangular blocks of the feed layer. The lower end face of the seventh rectangular cavity of the feed layer is on the same plane as the lower end face of the sixth rectangular cavity of the feed layer. The left end face of the seventh rectangular cavity of the feed layer is connected to the right end face of the sixth rectangular cavity of the feed layer, and the two are in a close fit. The right end face of the seventh rectangular cavity of the feed layer is connected to the left end face of the second rectangular block of the feed layer, and the two are in a close fit. The distance between the front end face and the rear end face of the seventh rectangular cavity of the feed layer is 0.99λ, the distance between the left end face and the right end face of the seventh rectangular cavity of the feed layer is 0.03λ, and the distance between the upper end face and the lower end face of the seventh rectangular cavity of the feed layer is 0.1λ. The second trapezoidal interface of the feed layer and the first trapezoidal interface of the feed layer are symmetrical about the three-port converter. The second rectangular cavity of the feed layer serves as the input end of the feed layer.

[0046] This utility model, by adopting the above technical solution, has the following significant technical effects:

[0047] The low-sidelobe planar array antenna designed in this invention has a simple structure, low cost, is easy to mass-produce, and has a wide frequency bandwidth and high efficiency. Attached Figure Description

[0048] Figure 1 This is a structural diagram of the utility model.

[0049] Figure 2 This is a structural diagram of the radiation layer of this utility model.

[0050] Figure 3 This is a structural diagram of the back cavity layer of this utility model.

[0051] Figure 4 This is a structural diagram of the polygonal parallel plate of this utility model.

[0052] Figure 5 This is a front view of the second back cavity layer of this utility model.

[0053] Figure 6 This is a structural diagram of the back side of the second back cavity layer of this utility model.

[0054] Figure 7 This is a structural diagram of the power supply layer of this utility model.

[0055] Figure 8 This is a three-dimensional structural diagram of the power supply layer of this utility model.

[0056] Among them, 1—radiation layer, 2—back cavity layer, 3—feed layer, 11—radiation unit, 12—first radiation component, 13—second radiation component, 21—first back cavity layer, 22—second back cavity layer, 23—third back cavity layer, 24—back cavity layer polygonal parallel plate, 241—polygonal parallel plate second rectangular block, 242—polygonal parallel plate third rectangular block, 243—polygonal parallel plate first right-angled triangle block, 244—polygonal parallel plate fourth rectangular block, 245—polygonal parallel plate second right-angled triangle block, 31—feed layer three-port converter, 32—feed layer concave interface, 33—feed layer trapezoidal interface, 221—second back cavity layer first rectangular strip, 222—second back cavity layer second rectangular strip. Detailed Implementation

[0057] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0058] Example 1

[0059] A 45-degree low-sidelobe planar array antenna includes a radiating layer 1, a cavity back layer 2, and a feed layer 3;

[0060] Radiation layer 1 is stacked on top of cavity layer 2, cavity layer 2 is stacked on top of feed layer 3, and feed layer 3 is used to output 4*4 TE10 mode signals.

[0061] Radiation layer 1 has 4*4 input terminals and 4*4 output terminals. The 4*4 input terminals of radiation layer 1 are used to connect to the 4*4 TE10 mode signals output by feed layer 3 through the relay of back cavity layer 2. The 4*4 output terminals of radiation layer 1 are used to radiate the 4*4 TE10 mode signals output by feed layer 3 into free space.

[0062] The radiating layer 11 comprises 4*4 radiating elements 11, which together form a radiating array. The radiating array is formed by distributing the 4*4 radiating elements 11 in a 4x4 grid. The center-to-center distance between two adjacent radiating elements 11 in the same row is 0.76λ, and the center-to-center distance between two adjacent radiating elements 11 in the same column is also 0.76λ, where λ = c / f, c is the wave velocity (c = 3*10^8 m / s), and f is the center operating frequency of the low sidelobe planar array antenna.

[0063] The radiation unit 11 includes a first radiation component 12 and a second radiation component 13. The first radiation component 12 and the second radiation component 13 are arranged at intervals, and the radiation component will overlap with the second radiation component 13 after being translated backward by 0.76λ. The center distance between the first radiation component 12 and the second radiation component 13 is 0.76λ.

[0064] Example 2

[0065] Based on Embodiment 1, the first radiation component 12 of this embodiment includes a first rectangular block of radiation layer 1 and a first rectangular strip of radiation layer 1. The first rectangular block of radiation layer 1 and the first rectangular strip of radiation layer 1 are arranged sequentially from top to bottom, and the centers of the first rectangular block of radiation layer 1 and the first rectangular strip of radiation layer 1 are located on the same straight line.

[0066] The distance between the front end face and the rear end face of the first rectangular block of radiating layer 1 is 0.55λ, the distance between the left end face and the right end face of the first rectangular block of radiating layer 1 is 0.43λ, and the distance between the upper end face and the lower end face of the first rectangular block of radiating layer 1 is 0.18λ. If the first rectangular block of radiating layer 1 is rotated 45 degrees counterclockwise around the center line, the plane containing its front end face will be parallel to the plane containing the front end face of the polygonal parallel plate 24. The upper end face of the first rectangular strip of radiating layer 1 is integrally formed and connected to the lower end face of the first rectangular block of radiating layer 1, and the two are in a close fit. The front end face of the first rectangular strip of radiating layer 1 is on the same plane as the front end face of the first rectangular block of radiating layer 1. The rear end face of the first rectangular strip of layer 1 is on the same plane as the rear end face of the first rectangular block of radiation layer 1. The distance between the front end face and the rear end face of the first rectangular strip of radiation layer 1 is 0.55λ. The distance between the left end face and the right end face of the first rectangular strip of radiation layer 1 is 0.19λ. The distance between the upper end face and the lower end face of the first rectangular strip of radiation layer 1 is 0.09λ. The plane where the left end face of the first rectangular strip of radiation layer 1 is located and the left end face of the first rectangular block are equal to the plane where the right end face of the first rectangular strip of radiation layer 1 is located and the right end face of the first rectangular block are located. The lower end face of the first rectangular strip of radiation layer 1 is integrally formed and connected to the upper end face of the polygonal parallel plate 24, and the two are in a fitted state.

[0067] Example 3

[0068] Based on the above embodiments, the back cavity layer 2 of this embodiment is provided with a first back cavity layer 21, a second back cavity layer 22, and a third back cavity layer 23 in sequence; the first back cavity layer 21 is provided with a polygonal parallel plate 24; the second back cavity layer 22 is formed with a second back cavity layer first rectangular block, a second back cavity layer first rectangular strip 221, and a second back cavity layer second rectangular strip 222; the third back cavity layer 23 is provided with a third back cavity layer second rectangular block and a third back cavity layer third rectangular block.

[0069] The polygonal parallel plate 24 includes a second rectangular block 241, a third rectangular block 242, a first right-angled triangular block 243, a fourth rectangular block 244, and a second right-angled triangular block 245.

[0070] The upper faces of the second rectangular block 241, the third rectangular block 242, the first right-angled triangular block 243, the fourth rectangular block 244, and the second right-angled triangular block 245 of the polygonal parallel plate are all on the same plane.

[0071] The lower faces of the second rectangular block 241, the third rectangular block 242, the first right-angled triangle block 243, the fourth rectangular block 244, and the second right-angled triangle block 245 of the polygonal parallel plate are all on the same plane.

[0072] The distance between the upper and lower faces of the second rectangular block 241, the third rectangular block 242, the first right-angled triangle block 243, the fourth rectangular block 244, and the second right-angled triangle block 245 of the polygonal parallel plate is 0.11λ.

[0073] The front end face of the second rectangular block 241 of the polygonal parallel plate has a length of 0.54λ along the left-right direction, and the left end face of the second rectangular block 241 of the polygonal parallel plate has a length of 0.56λ along the front-back direction.

[0074] The front end face of the third rectangular block 242 of the polygonal parallel plate has a length of 0.16λ in the left-right direction, and the left end face of the third rectangular block 242 of the polygonal parallel plate has a length of 0.38λ in the front-back direction. The rear end face of the third rectangular block 242 of the polygonal parallel plate is connected to the front end face of the second rectangular block 241 of the polygonal parallel plate, and the two are in a fitted state.

[0075] The end face of the first right-angled side of the first right-angled triangle block 243 of the polygonal parallel plate is connected to the left end face of the third rectangular block 242 of the polygonal parallel plate and the two are in a close fit. The length of the end face of the first right-angled side of the first right-angled triangle block 243 of the polygonal parallel plate along the front-back direction is equal to the length of the left end face of the third rectangular block 242 of the polygonal parallel plate along the front-back direction.

[0076] The end face of the second right-angled side of the first right-angled triangle block 243 of the polygonal parallel plate is connected to the front face of the second rectangular block 241 of the polygonal parallel plate and the two are in a close fit. The length of the end face of the second right-angled side of the first right-angled triangle block 243 in the left-right direction is equal to 0.38λ. The sum of the length of the end face of the second right-angled side of the first right-angled triangle block 243 in the left-right direction and the length of the rear face of the third rectangular block 242 of the polygonal parallel plate in the left-right direction is equal to the length of the front face of the second rectangular block 241 of the polygonal parallel plate in the left-right direction.

[0077] The front end face of the fourth rectangular block 244 of the polygonal parallel plate has a length of 0.16λ in the left-right direction, and the left end face of the fourth rectangular block 244 of the polygonal parallel plate has a length of 0.38λ in the front-back direction. The front end face of the fourth rectangular block 244 of the polygonal parallel plate is connected to the rear end face of the second rectangular block 241 of the polygonal parallel plate, and the two are in a fitted state.

[0078] The end face of the second right-angled triangle block 245 of the polygonal parallel plate, where the first right-angled side is located, is connected to the right end face of the fourth rectangular block 244 of the polygonal parallel plate, and the two are in a close fit. The length of the end face of the second right-angled triangle block 245 along the front-back direction is equal to the length of the right end face of the fourth rectangular block 244 along the front-back direction. The end face of the second right-angled triangle block 245 is connected to the rear end face of the second rectangular block 241 of the polygonal parallel plate, and the two are in a close fit. The length of the end face of the second right-angled triangle block 245 in the left-right direction is equal to 0.38λ. The sum of the length of the end face of the second right-angled triangle block 245 in the left-right direction and the length of the front end face of the fourth rectangular block 244 in the left-right direction is equal to the length of the rear end face of the second rectangular block 241 in the left-right direction.

[0079] The front end face of the first rectangular strip 221 of the second back cavity layer is on the same plane as the front end face of the first rectangular block of the second back cavity layer 22. The left end face of the first rectangular strip 221 of the second back cavity layer is on the same plane as the left end face of the first rectangular block of the second back cavity layer 22. The lower end face of the first rectangular strip 221 of the second back cavity layer is connected to the upper end face of the first rectangular block of the second back cavity layer, and the two are in a close fit. The distance between the front end face and the rear end face of the first rectangular strip 221 of the second back cavity layer is 0.13λ, the distance between the left end face and the right end face of the first rectangular strip 221 of the second back cavity layer is 0.56λ, and the distance between the upper end face and the lower end face of the first rectangular strip 221 of the second back cavity layer is 0.1λ. The second first rectangular strip 221 of the second back cavity layer and the first first rectangular strip 221 of the second back cavity layer have a front-to-back symmetrical structure about the center line.

[0080] The front end face of the second rectangular strip 222 of the second back cavity layer is on the same plane as the front end face of the first rectangular block of the second back cavity layer 22. The right end face of the second rectangular strip 222 of the second back cavity layer is on the same plane as the right end face of the first rectangular block of the second back cavity layer 22. The lower end face of the second rectangular strip 222 of the second back cavity layer is connected to the upper end face of the first rectangular block of the second back cavity layer 22, and the two are in a close fit. The distance between the front end face and the rear end face of the second rectangular strip 222 of the second back cavity layer is 0.13λ, the distance between the left end face and the right end face of the second rectangular strip 222 of the second back cavity layer is 0.56λ, and the distance between the upper end face and the lower end face of the second rectangular strip 222 of the second back cavity layer is 0.1λ.

[0081] The second rectangular strip 222 of the second back cavity layer and the second rectangular strip 222 of the first second back cavity layer are symmetrical about the center line;

[0082] The second back cavity layer 22 has two first rectangular openings and two second rectangular openings on its first rectangular block.

[0083] The distance from the front end face of the first rectangular opening of the second back cavity layer 22 to the front end face of the first rectangular block of the second back cavity layer 22 is 0.77λ; the distance from the rear end face of the first rectangular opening of the second back cavity layer 22 to the rear end face of the first rectangular block of the second back cavity layer 22 is 0.77λ; the distance between the front end face and the rear end face of the first rectangular opening of the second back cavity layer 22 is 0.12λ; and the distance between the upper end face and the lower end face of the first rectangular opening of the second back cavity layer 22 is 0.13λ.

[0084] The first rectangular opening of the second back cavity layer 22 is symmetrical to the first rectangular opening of the first back cavity layer 22 about the center line. The distance between the left end face of the second rectangular opening of the second back cavity layer 22 and the left end face of the first rectangular block of the second back cavity layer 22 is 0.6λ.

[0085] The distance between the right end face of the second rectangular opening of the second back cavity layer 22 and the right end face of the first rectangular block of the second back cavity layer 22 is 0.6λ; the distance between the front end face of the second rectangular opening of the second back cavity layer 22 and its rear end face is 0.43λ; the distance between the left end face of the second rectangular opening of the second back cavity layer 22 and its right end face is 0.1λ; and the distance between the upper end face of the second rectangular opening of the second back cavity layer 22 and its lower end face is 0.13λ.

[0086] The distance between the front end face and the rear end face of the second rectangular block of the third back cavity layer 23 is 0.27λ, the distance between the left end face and the right end face of the second rectangular block of the third back cavity layer 23 is 0.64λ, and the distance between the upper end face and the lower end face of the second rectangular block of the third back cavity layer 23 is 0.22λ. The upper end face of the second rectangular block of the third back cavity layer 23 is connected to and in contact with the lower end face of the first rectangular block of the polygonal parallel plate 24. The front end face of the second rectangular block of the third back cavity layer 23 is connected to and in contact with the lower end face of the first rectangular block of the polygonal parallel plate 24. The distance between the front ends of the first rectangular blocks of parallel plate 24 is 0.69λ. The distance between the rear end of the second rectangular block of the third back cavity layer 23 and the rear end of the first rectangular block of the polygonal parallel plate 24 is 0.69λ. The distance between the left end of the second rectangular block of the third back cavity layer 23 and the left end of the first rectangular block of the polygonal parallel plate 24 is 0.34λ. The distance between the right end of the second rectangular block of the third back cavity layer 23 and the right end of the first rectangular block of the polygonal parallel plate 24 is 0.34λ.

[0087] The rear end face of the third rectangular block of the third back cavity layer 23 is connected to the front end face of the second rectangular block of the third back cavity layer 23, and the two are in a fitted state. The distance between the front end face and the rear end face of the third rectangular block of the third back cavity layer 23 is 0.2λ, the distance between the left end face and the right end face of the third rectangular block of the third back cavity layer 23 is 0.1λ, the distance between the upper end face and the lower end face of the third rectangular block of the third back cavity layer 23 is 0.08λ, and the distance between the upper end face of the third rectangular block of the third back cavity layer 23 and the upper end face of the second rectangular block 241 of the polygonal parallel plate is 0.04λ. The distance between the lower end face of the third rectangular block of the third back cavity layer 23 and the lower end face of the second rectangular block 241 of the polygonal parallel plate is 0.1λ. The distance between the left end face of the third rectangular block of the third back cavity layer 23 and the left end face of the second rectangular block 241 of the polygonal parallel plate is 0.27λ. The distance between the right end face of the third rectangular block of the third back cavity layer 23 and the right end face of the second rectangular block 241 of the polygonal parallel plate is 0.27λ. The second third rectangular block of the third back cavity layer 23 and the first third rectangular block of the third back cavity layer 23 are symmetrical about the second rectangular block of the third back cavity layer 23.

[0088] Example 4

[0089] Based on the above embodiments, the power supply layer 3 in this embodiment includes a power supply layer three-port converter 31, two power supply layer concave interfaces 32 and two power supply layer trapezoidal interfaces 33.

[0090] The feed layer three-port converter 31 includes a first rectangular block of feed layer 3, a first rectangular cavity of feed layer 3, a second rectangular cavity of feed layer 3, two third rectangular cavities of feed layer 3, and two fourth rectangular cavities of feed layer 3.

[0091] The distance between the front end face and the rear end face of the first rectangular block of feed layer 3 is 0.4λ, the distance between the left end face and the right end face of the first rectangular block of feed layer 3 is 0.62λ, and the distance between the top end face and the bottom end face of the first rectangular block of feed layer 3 is 0.22λ.

[0092] The distance between the front end face and the rear end face of the first rectangular cavity of feed layer 3 is 0.4λ, the distance between the left end face and the right end face of the first rectangular cavity of feed layer 3 is 0.44λ, the distance between the upper end face and the lower end face of the first rectangular cavity of feed layer 3 is 0.05λ, and the distance between the left end face of the first rectangular cavity of feed layer 3 and the left end face of the first rectangular block of feed layer 3 is equal to the distance between the right end face of the first rectangular cavity of feed layer 3 and the right end face of the first rectangular block of feed layer 3.

[0093] The second rectangular cavity of feed layer 3 and the first rectangular cavity of feed layer 3 are arranged in order from bottom to top. The distance between the front end face and the rear end face of the second rectangular cavity of feed layer 3 is 0.07λ, the distance between the left end face and the right end face of the second rectangular cavity of feed layer 3 is 0.09λ, the distance between the upper end face and the lower end face of the second rectangular cavity of feed layer 3 is 0.06λ, the lower end face of the second rectangular cavity of feed layer 3 is on the same plane as the lower end face of the first rectangular cavity of feed layer 3, and the distance between the left end face of the second rectangular cavity of feed layer 3 and the left end face of the first rectangular cavity of feed layer 3 is equal to the distance between the right end face of the second rectangular cavity of feed layer 3 and the right end face of the first rectangular cavity of feed layer 3.

[0094] The distance between the front end face and the rear end face of the third rectangular cavity of feed layer 3 is 0.09λ, the distance between the left end face and the right end face of the third rectangular cavity of feed layer 3 is 0.04λ, and the distance between the upper end face and the lower end face of the third rectangular cavity of feed layer 3 is 0.06λ. The lower end face of the third rectangular cavity of feed layer 3 is on the same plane as the lower end face of the first rectangular cavity of feed layer 3. The distance between the front end face of the third rectangular cavity of feed layer 3 and the front end face of the first rectangular cavity of feed layer 3 is equal to the distance between the rear end face of the third rectangular cavity of feed layer 3 and the rear end face of the first rectangular cavity of feed layer 3. The left end face of the third rectangular cavity of feed layer 3 is connected to the left end face of the first rectangular cavity of feed layer 3, and the two are in a fitted state.

[0095] The third rectangular cavity of the second feed layer 3 is symmetrical to the third rectangular cavity of the first feed layer 3 about the first rectangular cavity of the feed layer 3. The distance between the front end face and the rear end face of the fourth rectangular cavity of the feed layer 3 is 0.09λ, and the distance between the left end face and the right end face of the fourth rectangular cavity of the feed layer 3 is 0.09λ.

[0096] The distance between the upper and lower ends of the fourth rectangular cavity of feed layer 3 is 0.1λ. The distance between the front end of the fourth rectangular cavity of feed layer 3 and the front end of the first rectangular block of feed layer 3 is equal to the distance between the rear end of the fourth rectangular cavity of feed layer 3 and the rear end of the first rectangular block of feed layer 3. The lower end of the fourth rectangular cavity of feed layer 3 is in the same plane as the lower end of the first rectangular block of feed layer 3. The upper end of the fourth rectangular cavity of feed layer 3 is in the same plane as the upper end of the third rectangular cavity of feed layer 3.

[0097] The fourth rectangular cavity of the second feed layer 3 is symmetrical to the fourth rectangular cavity of the first feed layer 3 about the first rectangular cavity of the feed layer 3.

[0098] The concave interface 32 of the feed layer includes a second rectangular block of the feed layer 3 and a fifth rectangular cavity of the feed layer 3. The distance between the front end face and the rear end face of the second rectangular block of the feed layer 3 is 0.4λ, the distance between the left end face and the right end face of the second rectangular block of the feed layer 3 is 0.13λ, and the distance between the upper end face and the lower end face of the second rectangular block of the feed layer 3 is 0.22λ. The right end face of the second rectangular block of the feed layer 3 is connected to the left end face of the first rectangular block of the feed layer 3 and the two are in a fitted state. The upper end face of the second rectangular block of the feed layer 3 is on the same plane as the upper end face of the first rectangular block of the feed layer 3, and the lower end face of the second rectangular block is on the same plane as the lower end face of the first rectangular block. The distance between the front end face and the rear end face of the fifth rectangular cavity of the feed layer 3 is 0.09λ.

[0099] The distance between the left end face and the right end face of the fifth rectangular cavity of feed layer 3 is 0.13λ, the distance between the upper end face and the lower end face of the fifth rectangular cavity of feed layer 3 is 0.1λ, the lower end face of the fifth rectangular cavity of feed layer 3 is on the same plane as the lower end face of the second rectangular block of feed layer 3, the distance between the front end face of the fifth rectangular cavity of feed layer 3 and the front end face of the second rectangular block is equal to the distance between the rear end face of the fifth rectangular cavity and the rear end face of the second rectangular block of feed layer 3, and the second fifth rectangular cavity of feed layer 3 and the first fifth rectangular cavity of feed layer 3 are symmetrical about the first rectangular block of feed layer 3.

[0100] The trapezoidal interface 33 of the feed layer includes a third rectangular block, a fourth rectangular block, a sixth rectangular cavity, and a seventh rectangular cavity of the feed layer 3. The upper end face of the third rectangular block and the upper end face of the fourth rectangular block are on the same plane. The lower end face of the third rectangular block and the lower end face of the fourth rectangular block are on the same plane. The right end face of the third rectangular block and the right end face of the fourth rectangular block are on the same plane. The rear end face of the third rectangular block and the front end face of the fourth rectangular block are connected and in contact. The distance between the front end face and the rear end face of the third rectangular block is 0.22λ. The distance between the left and right ends of the three rectangular blocks is 0.66λ. The distance between the top and bottom ends of the third rectangular block of feed layer 3 is 0.22λ. The right end of the third rectangular block of feed layer 3 is connected to the right end of the second rectangular block of feed layer 3, and the two are in a close fit. The distance between the front and rear ends of the fourth rectangular block of feed layer 3 is 0.18λ. The distance between the left and right ends of the fourth rectangular block of feed layer 3 is 0.47λ. The distance between the top and bottom ends of the fourth rectangular block of feed layer 3 is 0.22λ. The right end of the fourth rectangular block of feed layer 3 is connected to the right end of the second rectangular block of feed layer 3, and the two are in a close fit. The distance between the front end face of the sixth rectangular cavity and the front end face of the third rectangular block of feed layer 3 is equal to the distance between the rear end face of the sixth rectangular cavity of feed layer 3 and the rear end face of the fourth rectangular block of feed layer 3. The distance between the front end face and the rear end face of the sixth rectangular cavity of feed layer 3 is 0.09λ. The distance between the left end face and the right end face of the sixth rectangular cavity of feed layer 3 is 0.3λ. The distance between the upper end face and the lower end face of the sixth rectangular cavity of feed layer 3 is 0.08λ. The lower end face of the sixth rectangular cavity of feed layer 3 is in the same plane as the lower end faces of the third and fourth rectangular blocks of feed layer 3. The lower end face of the seventh rectangular cavity of feed layer 3 is in the same plane as the lower end face of the sixth rectangular cavity of feed layer 3. The left end face of the seventh rectangular cavity of the feed layer 3 is connected to the right end face of the sixth rectangular cavity of the feed layer 3 and the two are in a close fit. The right end face of the seventh rectangular cavity of the feed layer 3 is connected to the left end face of the second rectangular block of the feed layer 3 and the two are in a close fit. The distance between the front end face and the rear end face of the seventh rectangular cavity of the feed layer 3 is 0.99λ. The distance between the left end face and the right end face of the seventh rectangular cavity of the feed layer 3 is 0.03λ. The distance between the upper end face and the lower end face of the seventh rectangular cavity of the feed layer 3 is 0.1λ. The second trapezoidal interface 33 of the feed layer and the first trapezoidal interface 33 of the feed layer are symmetrical about the three-port converter. The second rectangular cavity of the feed layer 3 serves as the input terminal of the feed layer 3.

Claims

1. A 45-degree low sidelobe flat panel array antenna comprising a radiation layer, a back cavity layer and a feed layer; characterized in that: the radiation layer is stacked above the back cavity layer, the back cavity layer is stacked above the feed layer, and the feed layer is used to output a 4*4-way TE10 mode signal; the radiation layer has 4*4 input ends and 4*4 output ends, the 4*4 input ends of the radiation layer are used to access the 4*4-way TE10 mode signal output by the feed layer one by one through the relay of the back cavity layer, and the 4*4 output ends of the radiation layer are used to radiate the 4*4-way TE10 mode signal output by the feed layer to the free space one by one.

2. The 45-degree low side lobe flat panel array antenna according to claim 1, characterized in that: the radiation layer comprises 4*4 radiation units, and the 4*4 radiation units form a radiation array in a 4-row*4-column manner, and the center distance between adjacent two radiation units in the same row is 0.76λ, the center distance between adjacent two radiation units in the same column is 0.76λ, λ=c / λ, c is the wave speed, c=3*10^8 m / s, and f is the center working frequency of the low sidelobe flat panel array antenna, the radiation unit comprises a first radiation component and a second radiation component, the first radiation component and the second radiation component are arranged in front of and behind each other, and the first radiation component and the second radiation component overlap after the first radiation component is translated backward by 0.76λ, and the center distance between the first radiation component and the second radiation component is 0.76λ.

3. The 45-degree low side lobe flat panel array antenna according to claim 1, wherein: the first radiation component comprises a radiation layer first rectangular block and a radiation layer first rectangular strip, the radiation layer first rectangular block and the radiation layer first rectangular strip are sequentially arranged from top to bottom, and the centers of the radiation layer first rectangular block and the radiation layer first rectangular strip are located on the same straight line; the distance between the front end face of the radiation layer first rectangular block and the rear end face thereof is 0.55λ, the distance between the left end face of the radiation layer first rectangular block and the right end face thereof is 0.43λ, the distance between the upper end face of the radiation layer first rectangular block and the lower end face thereof is 0.18λ, if the radiation layer first rectangular block is rotated counterclockwise by 45 degrees around the center line, the plane where the front end face of the radiation layer first rectangular block is located will be parallel to the plane where the front end face of the polygonal parallel plate is located, the upper end face of the radiation layer first rectangular strip is integrally connected with the lower end face of the radiation layer first rectangular block and is in a state of adhesion, the front end face of the radiation layer first rectangular strip is in the same plane as the front end face of the radiation layer first rectangular block, the rear end face of the radiation layer first rectangular strip is in the same plane as the rear end face of the radiation layer first rectangular block, the distance between the front end face of the radiation layer first rectangular strip and the rear end face thereof is 0.55λ, the distance between the left end face of the radiation layer first rectangular strip and the right end face thereof is 0.19λ, the distance between the upper end face of the radiation layer first rectangular strip and the lower end face thereof is 0.09λ, the distance between the left end face of the radiation layer first rectangular strip and the plane where the left end face of the first rectangular block is located is equal to the distance between the right end face of the radiation layer first rectangular strip and the plane where the right end face of the radiation layer first rectangular block is located, and the lower end face of the radiation layer first rectangular strip is integrally connected with the upper end face of the polygonal parallel plate and is in a state of adhesion.

4. The 45-degree low side lobe flat panel array antenna according to claim 1, wherein: The back cavity layer is sequentially provided with a first back cavity layer, a second back cavity layer and a third back cavity layer; the first back cavity layer is provided with a plurality of parallel plates; the second back cavity layer is formed with a second back cavity layer first rectangular block, a second back cavity layer first rectangular strip and a second back cavity layer second rectangular strip; and the third back cavity layer is provided with a third back cavity layer second rectangular block and a third back cavity layer third rectangular block.

5. The 45-degree low sidelobe flat panel array antenna of claim 1, wherein: The front end surface of the second back cavity layer first rectangular strip is in the same plane as the front end surface of the second back cavity layer first rectangular block, the left end surface of the second back cavity layer first rectangular strip is in the same plane as the left end surface of the second back cavity layer first rectangular block, the lower end surface of the second back cavity layer first rectangular strip is connected to the upper end surface of the second back cavity layer first rectangular block and the two are in a state of adhesion, the distance between the front end surface and the rear end surface of the second back cavity layer first rectangular strip is 0.13λ, the distance between the left end surface and the right end surface of the second back cavity layer first rectangular strip is 0.56λ, the distance between the upper end surface and the lower end surface of the second back cavity layer first rectangular strip is 0.1λ, and the second block of the second back cavity layer first rectangular strip and the first block of the second back cavity layer first rectangular strip are front-back symmetric structures about the center line, The front end surface of the second back cavity layer second rectangular strip is in the same plane as the front end surface of the second back cavity layer first rectangular block, the right end surface of the second back cavity layer second rectangular strip is in the same plane as the right end surface of the second back cavity layer first rectangular block, the lower end surface of the second back cavity layer second rectangular strip is connected to the upper end surface of the second back cavity layer first rectangular block and the two are in a state of adhesion, the distance between the front end surface and the rear end surface of the second back cavity layer second rectangular strip is 0.13λ, the distance between the left end surface and the right end surface of the second back cavity layer second rectangular strip is 0.56λ, the distance between the upper end surface and the lower end surface of the second back cavity layer second rectangular strip is 0.1λ, The second block of the second back cavity layer second rectangular strip and the first block of the second back cavity layer second rectangular strip are front-back symmetric structures about the center line; The second back cavity layer first rectangular block is provided with two second back cavity layer first rectangular openings and two second back cavity layer second rectangular openings, The distance between the front end surface of the second back cavity layer first rectangular opening and the front end surface of the second back cavity layer first rectangular block is 0.77λ, the distance between the rear end surface of the second back cavity layer first rectangular opening and the rear end surface of the second back cavity layer first rectangular block is 0.77λ, the distance between the front end surface and the rear end surface of the second back cavity layer first rectangular opening is 0.12λ, and the distance between the upper end surface and the lower end surface of the second back cavity layer first rectangular opening is 0.13λ, The second back cavity layer second rectangular opening and the first back cavity layer second rectangular opening are left-right symmetric structures about the center line, and the distance between the left end surface of the second back cavity layer second rectangular opening and the left end surface of the second back cavity layer first rectangular block is 0.6λ, The distance between the right end face of the second rectangular port of the second back cavity layer and the right end face of the first rectangular block of the second back cavity layer is 0.6λ, the distance between the front end face of the second rectangular port of the second back cavity layer and the rear end face thereof is 0.43λ, the distance between the left end face of the second rectangular port of the second back cavity layer and the right end face thereof is 0.1λ, and the distance between the upper end face of the second rectangular port of the second back cavity layer and the lower end face thereof is 0.13λ, The distance between the front end face of the second rectangular block of the third back cavity layer and the rear end face thereof is 0.27λ, the distance between the left end face of the second rectangular block of the third back cavity layer and the right end face thereof is 0.64λ, the distance between the upper end face of the second rectangular block of the third back cavity layer and the lower end face thereof is 0.22λ, the upper end face of the second rectangular block of the third back cavity layer is connected with the lower end face of the first rectangular block of the multi-edge parallel plate and is in a state of adhesion, the distance between the front end face of the second rectangular block of the third back cavity layer and the front end face of the first rectangular block of the multi-edge parallel plate is 0.69λ, the distance between the rear end face of the second rectangular block of the third back cavity layer and the rear end face of the first rectangular block of the multi-edge parallel plate is 0.69λ, the distance between the left end face of the second rectangular block of the third back cavity layer and the left end face of the first rectangular block of the multi-edge parallel plate is 0.34λ, and the distance between the right end face of the second rectangular block of the third back cavity layer and the right end face of the first rectangular block of the multi-edge parallel plate is 0.34λ, The rear end face of the third rectangular block of the third back cavity layer is connected with the front end face of the second rectangular block of the third back cavity layer and both are in a state of adhesion, the distance between the front end face of the third rectangular block of the third back cavity layer and the rear end face thereof is 0.2λ, the distance between the left end face of the third rectangular block of the third back cavity layer and the right end face thereof is 0.1λ, the distance between the upper end face of the third rectangular block of the third back cavity layer and the lower end face thereof is 0.08λ, the distance between the upper end face of the third rectangular block of the third back cavity layer and the upper end face of the second rectangular block of the second back cavity layer is 0.04λ, the distance between the lower end face of the third rectangular block of the third back cavity layer and the lower end face of the second rectangular block of the second back cavity layer is 0.1λ, the distance between the left end face of the third rectangular block of the third back cavity layer and the left end face of the second rectangular block of the second back cavity layer is 0.27λ, the distance between the right end face of the third rectangular block of the third back cavity layer and the right end face of the second rectangular block of the second back cavity layer is 0.27λ, and the second third rectangular block of the third back cavity layer is front-back symmetric with the first third rectangular block of the third back cavity layer about the second rectangular block of the third back cavity layer. 6.The 45-degree low-sidelobe flat panel array antenna of claim 1, wherein: the feed layer comprises a feed layer three-port converter, two feed layer concave interfaces, and two feed layer trapezoidal interfaces; the feed layer three-port converter comprises a feed layer first rectangular block, a feed layer first rectangular cavity, a feed layer second rectangular cavity, two feed layer third rectangular cavities, and two feed layer fourth rectangular cavities, the distance between the front end face of the feed layer first rectangular block and the rear end face thereof is 0.4λ, the distance between the left end face of the feed layer first rectangular block and the right end face thereof is 0.62λ, and the distance between the upper end face of the feed layer first rectangular block and the lower end face thereof is 0.22λ, The distance between the front end face of the first rectangular cavity of the feed layer and the rear end face thereof is 0.4λ, the distance between the left end face of the first rectangular cavity of the feed layer and the right end face thereof is 0.44λ, the distance between the upper end face of the first rectangular cavity of the feed layer and the lower end face thereof is 0.05λ, and the distance between the left end face of the first rectangular cavity of the feed layer and the left end face of the first rectangular block of the feed layer is equal to the distance between the right end face of the first rectangular cavity of the feed layer and the right end face of the first rectangular block of the feed layer, The second rectangular cavity of the feed layer is arranged in sequence from bottom to top with the first rectangular cavity of the feed layer, the distance between the front end face of the second rectangular cavity of the feed layer and the rear end face thereof is 0.07λ, the distance between the left end face of the second rectangular cavity of the feed layer and the right end face thereof is 0.09λ, the distance between the upper end face of the second rectangular cavity of the feed layer and the lower end face thereof is 0.06λ, the lower end face of the second rectangular cavity of the feed layer is located in the same plane as the lower end face of the first rectangular cavity of the feed layer, and the distance between the left end face of the second rectangular cavity of the feed layer and the left end face of the first rectangular cavity of the feed layer is equal to the distance between the right end face of the second rectangular cavity of the feed layer and the right end face of the first rectangular cavity of the feed layer, The distance between the front end face of the third rectangular cavity of the feed layer and the rear end face thereof is 0.09λ, the distance between the left end face of the third rectangular cavity of the feed layer and the right end face thereof is 0.04λ, the distance between the upper end face of the third rectangular cavity of the feed layer and the lower end face thereof is 0.06λ, the lower end face of the third rectangular cavity of the feed layer is located in the same plane as the lower end face of the first rectangular cavity of the feed layer, the distance between the front end face of the third rectangular cavity of the feed layer and the front end face of the first rectangular cavity of the feed layer is equal to the distance between the rear end face of the third rectangular cavity of the feed layer and the rear end face of the first rectangular cavity of the feed layer, and the left end face of the third rectangular cavity of the feed layer is connected with the left end face of the first rectangular cavity of the feed layer and both are in a state of adhesion, The first third rectangular cavity of the second feed layer is left-right symmetrical about the first third rectangular cavity of the first feed layer, the distance between the front end face of the fourth rectangular cavity of the feed layer and the rear end face thereof is 0.09λ, and the distance between the left end face of the fourth rectangular cavity of the feed layer and the right end face thereof is 0.09λ, The distance between the upper end face of the fourth rectangular cavity of the feed layer and the lower end face thereof is 0.1λ, the distance between the front end face of the fourth rectangular cavity of the feed layer and the front end face of the first rectangular block of the feed layer is equal to the distance between the rear end face of the fourth rectangular cavity of the feed layer and the rear end face of the first rectangular block of the feed layer, the lower end face of the fourth rectangular cavity of the feed layer is located in the same plane as the lower end face of the first rectangular block of the feed layer, and the upper end face of the fourth rectangular cavity of the feed layer is located in the same plane as the upper end face of the third rectangular cavity of the feed layer, The second fourth rectangular cavity of the feed layer is left-right symmetrical about the first fourth rectangular cavity of the feed layer relative to the first rectangular cavity of the feed layer. The concave interface of the feed layer comprises a second rectangular block of the feed layer and a fifth rectangular cavity of the feed layer, the distance between the front end surface of the second rectangular block of the feed layer to the rear end surface thereof is 0.4λ, the distance between the left end surface of the second rectangular block of the feed layer to the right end surface thereof is 0.13λ, the distance between the upper end surface of the second rectangular block of the feed layer to the lower end surface thereof is 0.22λ, the right end surface of the second rectangular block of the feed layer is connected with the left end surface of the first rectangular block of the feed layer and the two are in the state of adhesion, the upper end surface of the second rectangular block of the feed layer is in the same plane with the upper end surface of the first rectangular block of the feed layer, the lower end surface of the second rectangular block is in the same plane with the lower end surface of the first rectangular block, the distance between the front end surface of the fifth rectangular cavity of the feed layer to the rear end surface thereof is 0.09λ, the distance between the left end surface of the fifth rectangular cavity of the feed layer to the right end surface thereof is 0.13λ, the distance between the upper end surface of the fifth rectangular cavity of the feed layer to the lower end surface thereof is 0.1λ, the lower end surface of the fifth rectangular cavity of the feed layer is in the same plane with the lower end surface of the second rectangular block of the feed layer, the distance between the front end surface of the fifth rectangular cavity of the feed layer to the front end surface of the second rectangular block is equal to the distance between the rear end surface of the fifth rectangular cavity of the feed layer to the rear end surface of the second rectangular block of the feed layer, the second fifth rectangular cavity of the feed layer is left-right symmetrical with the first fifth rectangular cavity of the feed layer about the first rectangular block of the feed layer; The feeding layer trapezoidal interface comprises a feeding layer third rectangular block, a feeding layer fourth rectangular block, a feeding layer sixth rectangular cavity and a feeding layer seventh rectangular cavity, the upper end face of the feeding layer third rectangular block is in the same plane with the upper end face of the feeding layer fourth rectangular block, the lower end face of the feeding layer third rectangular block is in the same plane with the lower end face of the feeding layer fourth rectangular block, the right end face of the feeding layer third rectangular block is in the same plane with the right end face of the feeding layer fourth rectangular block, the rear end face of the feeding layer third rectangular block is connected with the front end face of the feeding layer fourth rectangular block and the two are in the state of adhesion, the distance between the front end face of the feeding layer third rectangular block and the rear end face thereof is 0.22l, the distance between the left end face of the feeding layer third rectangular block and the right end face thereof is 0.66l, the distance between the upper end face of the feeding layer third rectangular block and the lower end face thereof is 0.22l, the right end face of the feeding layer third rectangular block is connected with the right end face of the feeding layer second rectangular block and the two are in the state of adhesion, the distance between the front end face of the feeding layer fourth rectangular block and the rear end face thereof is 0.18l, the distance between the left end face of the feeding layer fourth rectangular block and the right end face thereof is 0.47l, the distance between the upper end face of the feeding layer fourth rectangular block and the lower end face thereof is 0.22l, the right end face of the feeding layer fourth rectangular block is connected with the right end face of the feeding layer second rectangular block and the two are in the state of adhesion, the distance between the front end face of the feeding layer sixth rectangular cavity and the front end face of the feeding layer third rectangular block is equal to the distance between the rear end face of the feeding layer sixth rectangular cavity and the rear end face of the feeding layer fourth rectangular block, the distance between the front end face of the feeding layer sixth rectangular cavity and the rear end face thereof is 0.09l, the distance between the left end face of the feeding layer sixth rectangular cavity and the right end face thereof is 0.3l, the distance between the upper end face of the feeding layer sixth rectangular cavity and the lower end face thereof is 0.08l, the lower end face of the feeding layer sixth rectangular cavity is in the same plane with the lower end faces of the feeding layer third rectangular block and the feeding layer fourth rectangular block, the lower end face of the feeding layer seventh rectangular cavity is in the same plane with the lower end face of the feeding layer sixth rectangular cavity, the left end face of the feeding layer seventh rectangular cavity is connected with the right end face of the feeding layer sixth rectangular cavity and the two are in the state of adhesion, the right end face of the feeding layer seventh rectangular cavity is connected with the left end face of the feeding layer second rectangular block and the two are in the state of adhesion, the distance between the front end face of the feeding layer seventh rectangular cavity and the rear end face thereof is 0.99l, the distance between the left end face of the feeding layer seventh rectangular cavity and the right end face thereof is 0.03l, the distance between the upper end face of the feeding layer seventh rectangular cavity and the lower end face thereof is 0.1l, the second feeding layer trapezoidal interface is left-right symmetrical with the first feeding layer trapezoidal interface about the three-port converter; and the feeding layer second rectangular cavity serves as the input end of the feeding layer.

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