Space-Time-Coding Metasurface-Enabled Integrated Design of Radar Communication and Electromagnetic Stealth
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摘要: 当前,传统雷达天线通过发射高频电磁信号以及材料结构设计实现主动电磁干扰和雷达散射截面积缩小的带内隐身。同时,又需要大规模TR组件或机械控制实现多向雷达通信。因此,实现带内隐身与多向辐射的集成化动态调制,成为当前电磁调控领域面临的一项巨大技术挑战。在此,该文提出一种工作于X波段能够同时实现波束扫描和电磁隐身的时空编码超表面,该器件采用时-空相位联合编码策略,通过协同调控电磁波的空间域与频率域特性,重构传播方向并调控谐波功率分布,实现了谐波波束转向以及雷达散射截面积(RCS)缩减。作为概念验证,该文采用印制电路板(PCB)工艺制作了一个8×8的超表面模型,利用FPGA开发板进行控制并通过矢量网络分析仪采集回波信号增益。所设计的超表面成功实现–45°~+45°范围内波束扫描和回波增益降低最大值为14.83 dB的RCS缩减。相信该设计能够为自适应多维度电磁波调控及先进电磁对抗技术提供了新路径与实验支撑。Abstract:
Objective To address the complexity and limited modulation capabilities of existing reconfigurable metasurfaces that integrate radiation and stealth functions, a space-time-coding metasurface is proposed for dynamic switching between beam scanning and Radar Cross Section (RCS) reduction. By periodically modulating the states of the meta-atoms in the time domain, differentiated phase distributions are generated for the incident wave and its harmonics. This enables integrated radiation and electromagnetic stealth without complex Transmit-Receive (T/R) components or multilayer structures. The proposed design provides a simple and low-cost approach for integrated radar communication and electromagnetic stealth. Methods The metasurface adopts a metal-dielectric-metal structure, with each meta-atom integrating a PIN diode for 1-bit reflection-phase modulation. Electromagnetic simulations are performed using CST Microwave Studio. At the center frequency of 10.0 GHz, the two diode states provide a reflection phase difference close to 180°, with a near-lossless co-polarized reflection amplitude. Binary Particle Swarm Optimization (BPSO) is used to optimize the space-time-coding sequences for beam scanning and RCS reduction. An 8 × 8 prototype is fabricated using Printed Circuit Board (PCB) technology. A Vector Network Analyzer (VNA) equipped with an S97082A option is used to measure the radiation and scattering characteristics of the prototype. Results and Discussions Simulations and measurements confirm that the proposed space-time-coding metasurface provides beam scanning and RCS reduction. In the radiation mode, the fundamental, +1st, +2nd, +3rd, –1st, –2nd, and –3rd harmonics are steered to +2°, +14°, +32°, +46°, –15°, –28°, and –44°, respectively. The average error between the measured and target beam directions is 1.3°. The average sidelobe levels of the ±1st, ±2nd, and fundamental harmonics are 10.59 dB lower than the corresponding main lobes. In the scattering mode, the peak echo gain at 10.0 GHz is reduced by 11.56 dB relative to a copper plate. Over 9.9~10.1 GHz, the echo gain is reduced by approximately 10 dB, except at 9.93 GHz and 10.04 GHz, where the reductions are 8.07 dB and 7.89 dB, respectively. The maximum reduction reaches 14.83 dB at 9.95 GHz. These results verify the integrated radiation and scattering-control capabilities of the proposed metasurface. Conclusions A space-time-coding metasurface is proposed for integrated radiation and electromagnetic stealth. By integrating PIN diodes into the meta-atoms, the reflection states are periodically modulated on a planar metasurface to generate differentiated equivalent phase distributions at different harmonic frequencies. This enables multi-angle beam scanning without T/R components and reduces the echo gain through spatial and temporal coding. The proposed design simplifies the system architecture and reduces hardware requirements. The demonstrated beam scanning and RCS reduction indicate its potential for integrated radar communication and electromagnetic stealth. -
表 1 各次谐波不同情景下的偏折角度
谐波次序 –3 –2 –1 0 +1 +2 +3 目标偏折角度(°) –45 –30 –15 0 15 30 45 模拟偏折角度(°) –45 –29 –14 0 13 31 45 实测偏折角度(°) –44 –28 –15 2 14 32 46 -
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