Full-metal dual-polarized broadband multifunctional metasurface structure for c-band satellite communication anti-jamming

Abstract

The application belongs to the technical field of satellite communication, and specifically provides a full-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference, which is used to meet the interference suppression requirements of high-reliability communication systems such as satellite ground stations, airborne / shipborne communication terminals and the like. The application adopts a periodic array composed of multiple layers of improved Jerusalem cross slit unit, and realizes the low-loss transmission performance of better than-1dB in TE and TM dual-polarized modes through innovative interlayer coupling mechanism and electromagnetic resonance characteristic optimization design, while keeping a low profile. In particular, the structure shows stable broadband wave transmission characteristics at a small angle of incidence, and exhibits significant angle selectivity at a large angle of incidence, and the interference suppression ratio can be more than 15dB. In summary, the application provides a metasurface structure with broadband performance, dual-polarization compatibility and angle selectivity, which can effectively suppress the influence of 5G base stations and other same-frequency interference sources.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication technology, and specifically provides an all-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference, which is particularly suitable for integrated electromagnetic metasurface design with both frequency selection and space beam control functions. Background Technology

[0002] With the large-scale commercial deployment of fifth-generation mobile communication (5G) technology, the 3.4-3.6 GHz band has become one of the main operating frequency bands for 5G networks. However, this band severely overlaps with the C-band (3.4-4.2 GHz) for satellite communication, causing strong interference between 5G base station signals and satellite ground station receiving systems. Especially in densely populated areas such as cities, the out-of-band radiation and adjacent channel leakage power of 5G signals can degrade the signal-to-noise ratio of satellite receivers by more than 10 dB, seriously affecting communication quality. Traditional solutions (such as adding bandpass filters) can partially suppress out-of-band interference, but they cannot effectively solve the problem of mutual interference between 5G signals and satellite signals in the same frequency band. At the same time, they will also reduce the effective operating bandwidth of the system. Since C-band satellite communication is usually conducted by high-orbit satellites, high-gain antennas are required for communication. Therefore, high-gain parabolic antennas are widely used. Due to the extremely low sidelobes of parabolic antennas, traditional angle-selective surfaces often cannot play a role or have a very weak effect when working in conjunction with parabolic antennas.

[0003] Currently, satellite ground stations primarily employ two techniques to address 5G interference: adaptive filtering and spatial beam nulling. While adaptive filters can dynamically suppress the interference spectrum, they inevitably attenuate useful signals, leading to a system throughput decrease of over 15%. Although phased array antenna systems can create radiation nulls in the direction of interference through beam nulling, the system complexity increases significantly when facing multiple 5G base station interference sources, making real-time performance difficult to guarantee. Furthermore, most existing metasurface filters only support a single polarization mode, failing to meet the requirements of dual-polarization satellite communication systems; while filters employing multilayer dielectric structures can achieve good frequency selectivity, they suffer from high insertion loss (typically exceeding 2dB) and limited power capacity, making them unsuitable for high-sensitivity satellite communication systems.

[0004] To address the shortcomings of existing technologies, there is an urgent need to develop a novel anti-interference solution. An ideal solution should achieve a high suppression ratio (greater than 25dB) in the 3.4-3.6GHz band while ensuring low-loss transmission (insertion loss less than 0.5dB) in the 3.7-4.2GHz satellite communication band. Furthermore, the solution should possess dual-polarization processing capabilities to effectively distinguish and isolate signals with different polarization modes. It also requires targeted design for parabolic antennas to ensure their effectiveness even with ultra-low sidelobes. In addition, through careful design of the metasurface elements, spatial filtering of interference in specific directions can be achieved without increasing system complexity, thus forming a frequency-space joint anti-interference mechanism. Based on this, this invention provides an all-metal dual-polarization broadband multifunctional metasurface structure for anti-interference in C-band satellite communication. Summary of the Invention

[0005] The purpose of this invention is to provide an all-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference, to meet the interference suppression requirements of high-reliability communication systems such as satellite ground stations and airborne / shipborne communication terminals. This invention employs a periodic array composed of multi-layered improved Jerusalem cross-slot elements, and through innovative inter-layer coupling mechanisms and optimized electromagnetic resonance characteristics, while also being specifically optimized for parabolic antennas, it achieves excellent dual-polarization performance and broadband response characteristics within the 3.4GHz-3.6GHz operating frequency band. Specifically, this metasurface structure, through carefully designed cross-slot element geometry and multi-layered cascaded structure, achieves low-loss transmission performance better than -1dB in both TE and TM dual-polarization modes while maintaining a low profile (<2λ). In particular, this structure exhibits stable broadband transmission characteristics (insertion loss <1dB) at small incident angles (0°–18°), while demonstrating significant angular selectivity at large incident angles (28°–80°), with an interference suppression ratio exceeding 15dB. Furthermore, thanks to its all-metal integrated structure design, this metasurface exhibits high power capacity and excellent thermal stability. Simultaneously, employing low-cost CNC machining processes, the manufacturing cost of a single device can be controlled to within 60% of that of traditional dielectric substrate filters. In summary, this invention proposes a metasurface structure that combines broadband performance, dual-polarization compatibility, and angle selectivity, effectively suppressing the impact of co-channel interference sources such as 5G base stations. It is particularly suitable for interference suppression scenarios in high-reliability communication systems such as satellite ground stations and airborne / shipborne communication terminals.

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

[0007] A multifunctional, all-metal dual-polarized broadband metasurface structure for C-band satellite communication anti-interference is composed of several metasurface units arranged in an array. The metasurface unit comprises a lower FSS structure, a first intermediate FSS structure, a second intermediate FSS structure, and an upper FSS structure, stacked sequentially from bottom to top, with air gaps between each layer. The lower and upper FSS structures share the same structure, specifically a metal plate with a first type of Jerusalem cross-shaped slit etched along its center. The first and second intermediate FSS structures share the same structure as the lower FSS structure, specifically a metal plate with a second type of Jerusalem cross-shaped slit etched along its center.

[0008] Furthermore, the first type of Jerusalem cross slit has a 90° rotationally symmetrical structure along the center, including: a first Jerusalem cross slit and a first square slit, the first Jerusalem cross slit and the first square slit are arranged to overlap along the center, and the end loading slit of the first Jerusalem cross slit adopts a stepped structure, so that it forms a convex shape from the outer edge to the inner edge.

[0009] Furthermore, the side length of the first square gap is P1, the main gap width of the first Jerusalem cross gap is W1, and P1>W1.

[0010] Furthermore, the central slot arm length of the first Jerusalem cross slot is L1, the outer edge arm length of the end loading slot is L2, the inner edge arm length of the end loading slot is L3, the height of the second step in the end loading slot is W2, and the height of the first step is W1-W2; P1 = 7mm, W1 = 5.3mm, L1 = 35mm, L2 = 21mm, L3 = 19mm, W2 = 4.3mm.

[0011] Furthermore, the second type of Jerusalem cross gap has a 90° rotational symmetry structure along the center, including: a second Jerusalem cross gap, a third Jerusalem cross gap and a second square gap. The second Jerusalem cross gap, the third Jerusalem cross gap and the second square gap are arranged to overlap along the center. The end of the second Jerusalem cross gap is loaded with a stepped structure, so that it forms a convex shape from the outer edge to the inner edge.

[0012] Furthermore, the side length of the second square slot is P2, the main slot width of the second Jerusalem cross slot is W3, and P2 > W3; the arm length of the center slot of the second Jerusalem cross slot is L4, the arm length of the outer edge of the end loading slot is L5, and the arm length of the inner edge of the end loading slot is L8; the arm length of the center slot of the third Jerusalem cross slot is L6, and the arm length of the end loading slot is L7, L4 > L6, L5 > L7; the main slot width of the third Jerusalem cross slot is W4, and W4 <W3。

[0013] Furthermore, the height of the first step in the loading gap at the end of the second Jerusalem cross gap is W5, and the height of the second step is W3-W5. The gap between the loading gap at the end of the third Jerusalem cross gap and the second square gap is Y; P2 = 8mm, L4 = 35mm, L5 = 22.4mm, L6 = 20mm, L7 = 12mm, L8 = 20mm, W3 = 2.8mm, W4 = 2.5mm, W5 = 2.2mm, Y = 3.5mm.

[0014] Furthermore, the lower FSS structure, the first intermediate FSS structure, the second intermediate FSS structure, and the upper FSS structure all use aluminum plates with a thickness h = 1 mm and a side length P = 41 mm.

[0015] Furthermore, the height of the air gap between the lower FSS structure and the first intermediate FSS structure, and between the upper FSS structure and the second intermediate FSS structure, is H2, where H2 = 49 mm; the height of the air gap between the first intermediate FSS structure and the second intermediate FSS structure is H1, where H1 = 46.3 mm.

[0016] Based on the above technical solution, the beneficial effects of the present invention are as follows:

[0017] This invention provides an all-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference. It employs a multi-layered, improved Jerusalem-like cross-slot array design, achieving broadband operation with a total thickness less than two operating wavelengths through precisely optimized unit geometry parameters and interlayer spacing. Based on equivalent circuit model analysis, the structure can be equivalent to a frequency-dependent variable susceptance network, whose impedance characteristics adaptively adjust with the incident angle: impedance matching for normal incidence, achieving efficient wave transmission; impedance mismatch for oblique incidence, achieving interference reflection. In other words, this invention can simultaneously achieve independent control of TE polarization (electric field along the x-axis) and TM polarization (magnetic field along the y-axis) for electromagnetic waves at any incident angle θ. Under normal incidence, the structure exhibits excellent broadband transmission characteristics, with a relative operating bandwidth exceeding 7% of the center frequency. Under oblique incidence, through a unique electromagnetic resonance mechanism, it selectively reflects co-frequency interference signals in specific frequency bands, achieving a combined space-frequency domain filtering function.

[0018] More precisely, the present invention has the following advantages:

[0019] First, it adopts an all-metal unibody design, completely abandoning the traditional dielectric substrate structure. This not only greatly increases the power capacity, but also significantly improves environmental stability. It can maintain stable performance over a wide temperature range, solving the problem of performance degradation of traditional dielectric substrate metasurfaces in extreme environments.

[0020] Second, through innovative multi-layer Jerusalem cross slot unit optimized structural design, dual-polarization broadband operating characteristics were achieved under low profile conditions with a total thickness of less than 2λ. Its operating bandwidth covers 3.4-3.6GHz, and the relative bandwidth reaches 7.15%, which fully meets the anti-interference requirements of current satellite communication systems.

[0021] Third, the unique impedance gradient design ensures stable interference suppression performance even at large incident angles (28° to 80°), with angle selectivity improved by more than 40% compared to traditional structures. Tests show that at a 45° oblique incident angle, the suppression ratio of interference signals in the 3.4-3.6GHz range can reach 25dB, while maintaining the insertion loss of less than 0.8dB in the 3.4-3.6GHz communication band.

[0022] Fourth, the completely passive design avoids phase noise and additional interference introduced by active devices, with an insertion loss of less than 1dB and an out-of-band rejection ratio better than 20dB. In practical applications, this structure can be easily integrated into radomes or radar array surfaces, making it particularly suitable for applications with strict requirements for suppressing co-channel interference, such as 5G communication, satellite navigation, and airborne radar. Test results show that in complex electromagnetic environments, this structure can improve the system's anti-interference capability by more than 15dB, providing an innovative solution to the co-channel interference problem faced by modern wireless systems. Furthermore, the implementation cost of this invention is 35% lower than that of traditional solutions, demonstrating significant technical and economic benefits. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the all-metal dual-polarized broadband multifunctional metasurface structure used for anti-interference in C-band satellite communication in this invention.

[0024] Figure 2 This is a schematic diagram of the unit structure of the all-metal dual-polarized broadband multifunctional metasurface structure used for anti-interference of C-band satellite communication in this invention.

[0025] Figure 3 This is a graph showing the transmission coefficient of the all-metal dual-polarized broadband multifunctional metasurface structure used for C-band satellite communication anti-interference in this invention at different incident angles in TE mode.

[0026] Figure 4 This is a graph showing the transmission coefficient of the all-metal dual-polarized broadband multifunctional metasurface structure used for C-band satellite communication anti-interference in this invention at different incident angles in TM mode.

[0027] Figure 5 This is a graph showing the angle selection performance of the all-metal dual-polarized broadband multifunctional metasurface structure used for C-band satellite communication anti-interference in this invention under TE and TM polarization modes.

[0028] Figure 6 This is a schematic diagram of the all-metal dual-polarized broadband multifunctional metasurface structure used for C-band satellite communication anti-interference in this invention, working in conjunction with a parabolic antenna.

[0029] Figure 7 The figure shows the measured results of the all-metal dual-polarized broadband multifunctional metasurface structure and the E-plane of the parabolic antenna used for anti-interference of C-band satellite communication in this invention.

[0030] Figure 8 The figure shows the measured results of the all-metal dual-polarized broadband multifunctional metasurface structure and the H-plane of the parabolic antenna used for anti-interference of C-band satellite communication in this invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] To facilitate a thorough understanding of the technical solutions of this invention by those skilled in the art, specific embodiments of this invention will now be described in detail with reference to the accompanying drawings. It should be particularly noted that the following embodiments are merely illustrative of the technical principles and implementation methods of this invention and do not constitute any limitation on the scope of protection of this invention. Based on the fundamental principles of this invention, any equivalent modifications or improvements made by those skilled in the art without creative effort should be included within the scope of protection of this invention. In the specific description, to avoid redundant descriptions of common knowledge affecting the understanding of the core technology of this invention, some conventional technical details will be appropriately omitted.

[0033] The accompanying drawings of this invention illustrate relevant structural diagrams. It should be noted that the drawings are not strictly to scale; some details have been appropriately enlarged for clarity, and some non-critical details may be simplified. The functional areas, structural layers, and their relative dimensions and positional relationships shown in the drawings are for illustrative purposes only, and reasonable deviations may exist in actual implementation due to process tolerances or technical limitations. Those skilled in the art can adaptively adjust the shape, size, and spatial layout of the illustrated structures according to specific application requirements; all such reasonable modifications should fall within the protection scope of this invention.

[0034] Specifically, this embodiment provides an all-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference, the structure of which is as follows: Figure 1 As shown, it is composed of 81 metasurface units arranged in a 9×9 array; the metasurface units are as follows: Figure 2 As shown, the structure includes a lower FSS structure, a first intermediate FSS structure, a second intermediate FSS structure, and an upper FSS structure stacked sequentially from bottom to top, with air gaps between each layer. The lower and upper FSS structures have the same structure, specifically a metal plate with a first type of Jerusalem cross slit etched along its center. The first and second intermediate FSS structures have the same structure as the lower FSS structure, specifically a metal plate with a second type of Jerusalem cross slit etched along its center.

[0035] Further, the first type of Jerusalem cross slot is rotationally symmetric by 90° about the center, and includes: a first Jerusalem cross slot and a first square slot. The first Jerusalem cross slot and the first square slot are overlapped along the center (the center of the entire first type of Jerusalem cross slot, which is also the center of the upper / lower layer FSS structure). The end-loaded slot of the first Jerusalem cross slot adopts a stepped structure, so that it forms a convex shape from the outer edge to the inner edge. The side length of the first square slot is P1, the main slot width of the first Jerusalem cross slot is W1, and P1 > W1. The center slot arm length of the first Jerusalem cross slot is L1, the outer edge arm length of the end-loaded slot is L2, the inner edge arm length of the end-loaded slot is L3, and the height of the second step in the end-loaded slot is W2, and the height of the first step is W1 - W2. Specifically, P1 = 7mm, W1 = 5.3mm, L1 = 35mm, L2 = 21mm, L3 = 19mm, W2 = 4.3mm.

[0036] Further, the second type of Jerusalem cross slot is rotationally symmetric by 90° about the center, and includes: a second Jerusalem cross slot, a third Jerusalem cross slot and a second square slot. The second Jerusalem cross slot, the third Jerusalem cross slot and the second square slot are overlapped along the center (the center of the entire second type of Jerusalem cross slot, which is also the center of the middle layer FSS structure). The end-loaded slot of the second Jerusalem cross slot adopts a stepped structure, so that it forms a convex shape from the outer edge to the inner edge. The side length of the second square slot is P2, the main slot width of the second Jerusalem cross slot is W3, and P2 > W3. The center slot arm length of the second Jerusalem cross slot is L4, the outer edge arm length of the end-loaded slot is L5, the inner edge arm length of the end-loaded slot is L8, the center slot arm length of the third Jerusalem cross slot is L6, the end-loaded slot arm length is L7, and L4 > L6, L5 > L7. The main slot width of the third Jerusalem cross slot is W4, and W4 < W3. The height of the first step in the end-loaded slot of the second Jerusalem cross slot is W5, the height of the second step is W3 - W5, and the gap between the end-loaded slot of the third Jerusalem cross slot and the second square slot is Y. Specifically, P2 = 8mm, L4 = 35mm, L5 = 22.4mm, L6 = 20mm, L7 = 12mm, L8 = 20mm, W3 = 2.8mm, W4 = 2.5mm, W5 = 2.2mm, Y = 3.5mm.

[0037] Further, the lower layer FSS structure, the first intermediate layer FSS structure, the second intermediate layer FSS structure and the upper layer FSS structure all adopt aluminum plates, the thickness of the aluminum plate h = 1mm, and the side length of the aluminum plate P = 41mm.

[0038] Furthermore, the height of the air gap between the lower FSS structure and the first intermediate FSS structure, and between the upper FSS structure and the second intermediate FSS structure, is H2, where H2 = 49 mm; the height of the air gap between the first intermediate FSS structure and the second intermediate FSS structure is H1, where H1 = 46.3 mm.

[0039] The beneficial effects of the present invention will be explained in detail below with reference to simulation tests.

[0040] Using the commercial finite element electromagnetic simulation software ANSYS Electronics 2021R1, the transmission coefficient of the all-metal dual-polarized broadband angle-selective surface structure in the implementation case was simulated and calculated under different incident angles in TE polarization mode. The results are as follows: Figure 3 As shown.

[0041] Using the commercial finite element electromagnetic simulation software ANSYS Electronics 2021R1, the transmission coefficient of the all-metal dual-polarized broadband angle-selective surface structure in the implementation case was simulated and calculated under different incident angles in TM polarization mode. The results are as follows: Figure 4 As shown.

[0042] The angle selection performance of the all-metal dual-polarization broadband angle-selective surface structure in the implementation case was simulated using the commercial finite element electromagnetic simulation software ANSYS Electronics 2021R1 under TE and TM polarization modes. The results are as follows: Figure 5 As shown.

[0043] like Figure 3 As shown in the figure, the horizontal axis represents frequency and the vertical axis represents transmission coefficient. As can be seen from the simulation results, the transmission characteristic curve of this structure is in the working center frequency band of 3.5GHz. When the incident angle θ of the TE-polarized electromagnetic wave is near 0°, the transmission coefficient varies from 0dB to -1dB, realizing the passband characteristics. When the incident angle θ of the TE-polarized electromagnetic wave is ≥28°, the transmission coefficient varies from -20dB to -125dB, realizing the bandstop characteristics. This shows that the present invention has good angle selectivity.

[0044] like Figure 4 As shown in the figure, the horizontal axis represents frequency and the vertical axis represents transmission coefficient. As can be seen from the simulation results, the transmission characteristic curve of this structure is in the working center frequency band of 3.5GHz. When the incident angle θ of the TM polarized electromagnetic wave is near 0°, the transmission coefficient varies from 0dB to -1dB, realizing the passband characteristics. When the incident angle θ of the TM polarized electromagnetic wave is ≥28°, the transmission coefficient varies from -20dB to -60dB, realizing the bandstop characteristics. This shows that the present invention has good angle selectivity.

[0045] like Figure 5 As shown in the figure, the horizontal axis represents frequency, and the vertical axis represents transmission coefficient. The simulation results show that when the transmission coefficient characteristic curve of this structure is in the operating frequency band of 3.4–3.6 GHz, the electromagnetic wave achieves a bandpass characteristic that varies from 0 dB to -1 dB within an incident angle range of -18° to +18°. Simultaneously, the bandstop characteristic varies between -20 dB and -120 dB within incident angle ranges of -28° to -80° and +28° to +80°. Furthermore, it exhibits good angular selectivity in both vertical and horizontal polarization directions.

[0046] Furthermore, this embodiment integrates the aforementioned all-metal dual-polarized broadband multifunctional metasurface structure for C-band satellite communication anti-interference with a parabolic antenna, such as... Figure 6 As shown, the designed metasurface structure is placed in a direction parallel to the parabolic aperture, at a distance greater than two wavelengths from the parabolic antenna feed; as Figure 7 The image shown is a diagram of the measured results of the E-plane of the parabolic antenna. Figure 8 The figure shows the measured results of the H-plane of the parabolic antenna. As can be seen from the figure, when the designed metasurface structure works in conjunction with the parabolic antenna, it can still perform the angle selection function. The incident wave at a small angle is almost lossless, and the incident wave at a large angle is almost totally reflected.

[0047] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All disclosed features, or steps in all methods or processes, may be combined in any way except for mutually exclusive features and / or steps.

Claims

1. An all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference, comprising several metasurface units arranged in an array; characterized in that, The metasurface unit comprises a lower FSS structure, a first intermediate FSS structure, a second intermediate FSS structure, and an upper FSS structure stacked sequentially from bottom to top, with air gaps between each layer. The lower FSS structure and the upper FSS structure have the same structure, specifically a metal plate with a first type of Jerusalem cross slit etched along its center. The first intermediate FSS structure and the second intermediate FSS structure have the same structure, specifically a metal plate with a second type of Jerusalem cross slit etched along its center. The first type of Jerusalem cross slit has a 90° rotationally symmetrical structure around the center, including: a first Jerusalem cross slit and a first square slit, the first Jerusalem cross slit and the first square slit are arranged to overlap along the center, and the end loading slit of the first Jerusalem cross slit adopts a stepped structure, so that it forms a convex shape from the outer edge to the inner edge. The second type of Jerusalem cross gap has a 90° rotational symmetry structure along the center, including: a second Jerusalem cross gap, a third Jerusalem cross gap and a second square gap. The second Jerusalem cross gap, the third Jerusalem cross gap and the second square gap are arranged to overlap along the center. The end of the second Jerusalem cross gap is loaded with a stepped structure, so that it forms a convex shape from the outer edge to the inner edge.

2. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 1, characterized in that, The side length of the first square slit is P 1. The main gap width of the first Jerusalem cross gap is... W 1, and P 1> W 1.

3. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 2, characterized in that, The central slot arm of the first Jerusalem cross slot is [length missing]. L 1. The outer edge arm length of the end loading gap is L 2. The inner edge arm length of the end loading gap is L 3. The height of the second step in the end loading gap is W 2. The height of the first step is W 1- W 2; P 1 = 7 mm, W 1 = 5.3 mm, L 1 = 35 mm L 2 = 21 mm, L 3 = 19 mm, W 2 = 4.3mm.

4. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 1, characterized in that, The side length of the second square gap is P 2. The main gap width of the second Jerusalem cross gap is W 3, and P 2> W 3; The arm length of the central slot of the second Jerusalem cross slot is L 4. The outer edge arm length of the end loading gap is L 5. The inner edge arm length of the end loading gap is L 8. The arm length of the central slot of the third Jerusalem cross slot is... L 6. The length of the end-loading gap arm is L 7, L 4> L 6, L 5> L 7; The main gap width of the third Jerusalem cross gap is W 4, and W 4< W 3.

5. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 4, characterized in that, The height of the first step in the loading gap at the end of the second Jerusalem cross gap is... W 5. The height of the second step is W 3- W 5. The gap between the end of the third Jerusalem cross slot and the second square slot is... Y ; P 2 = 8 mm, L 4 = 35 mm, L 5 = 22.4 mm, L 6 = 20 mm L 7 = 12 mm L 8 = 20 mm W 3 = 2.8mm, W 4 = 2.5 mm W 5 = 2.2 mm, Y = 3.5 mm.

6. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 1, characterized in that, The lower FSS structure, the first intermediate FSS structure, the second intermediate FSS structure, and the upper FSS structure all use aluminum plates, with a thickness of [missing information]. h = 1 mm, aluminum plate side length P = 41 mm.

7. The all-metal dual-polarization broadband multifunctional metasurface structure for C-band satellite communication anti-interference as described in claim 1, characterized in that, The height of the air gaps between the lower FSS structure and the first intermediate FSS structure, and between the upper FSS structure and the second intermediate FSS structure, are both H 2, H 2 = 49 mm; the height of the air gap between the first intermediate FSS structure and the second intermediate FSS structure is H 1, H 1 = 46.3 mm.

Images