多层相位调制表面电控方案优化及其对散射特性的影响

为提升相位调制表面的吸波性能,提出一种利用差分进化算法优化其有源层电控方案的方法,扩展了相位调制表面结构中有源层的层数.基于时间调制理论分析结构散射特性,借助差分进化算法对结构电控方案进行优化.优化后的电控方案最大限度地减少了相位调制表面散射回波基频分量的大小及其空间覆盖范围,且随着有源层层数的增加,效果持续改善,直到吸波性能出现地板效应而限制了有源层层数的扩展.综合考虑结构的复杂度与吸波性能对于相位调制表面的设计有一定的指导意义.

Optimization of Electronic Control Scheme of Multi-layer Phase-Modulated Surface and Its Influence on Scattering Properties

To improve absorbing properties of phase-modulated surface (PMS), a method for optimizing the switching scheme of PMS using a differential evolution (DE) algorithm is proposed. The number of active layers in PMS is increased. Scattering properties of PMS are theoretically studied using a time-modulation theory. The switching scheme of PMS is optimized using the DE algorithm. The results indicate that the optimized switching scheme can minimize the spatial coverage of scattered echo at the incident frequency. The effect is further enhanced as the number of active layers in PMS increases. The floor effect occurs when the number of active layers reaches a certain value, limiting the PMS structure conversely. This research is meaningful for the design of PMS by balancing its absorbing properties and structure complexity.