An electrically tunable metasurface is designed for radar cross-section (RCS) reduction application in this paper. It consists of $24\times 24$ cells individually loaded with variable capacitors so that their phase profiles can be independently controlled by the bias voltage. Therefore, based on the diffusive scattering principle and reflect-array theory, we arrange the adaptive phase differences between adjacent basic elements and reconfigure the appropriate phase distribution determined by a genetic algorithm (GA) corresponding to the operation frequency. Thus, stable monostatic and bistatic RCS reduction with normal incidence can be realized over a wide band by independently tuning the capacitance of each loaded varactor. Simulation results verify that the bistatic RCS reduction can reach at least 10 dBSm within both 4.2-7.3 GHz and 9.3-11.3 GHz. Simultaneously, the monostatic RCS reduction reaches at least 17.5 dBSm and 14 dBSm within the above two bands, respectively.

中文翻译：

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用于宽带宽超低雷达截面的动态相位可调超表面

本文设计了一种电可调超表面，用于减少雷达截面 (RCS) 应用。它由 24 美元\乘以 24 美元的单元组成，这些单元分别装有可变电容器，因此它们的相位分布可以由偏置电压独立控制。因此，基于漫散射原理和反射阵列理论，我们安排了相邻基本元素之间的自适应相位差，并根据操作频率重新配置了由遗传算法（GA）确定的适当相位分布。因此，通过独立调整每个负载变容二极管的电容，可以在宽频带上实现稳定的单基地和双基地 RCS 降低与法向入射。仿真结果验证了双基地 RCS 降低在 4.2-7.3 GHz 和 9.3-11 内都可以达到至少 10 dBSm。3 GHz。同时，在上述两个频段内，单站 RCS 降低分别至少达到 17.5 dBSm 和 14 dBSm。