一种S频段具有RCS缩减特性的编码超表面

Design of a S-band coded metasurface with RCS reduction characteristics

摘要:

设计了一种覆盖S频段的电控1-bit编码单元，并对其进行了等效电路分析与参数优化，单元在0/1两种工作状态下相位相差180°；以此为基础完成了9×9超表面阵列设计，通过设置变容二极管两端的偏置电压，使各个超表面单元能够根据设计需求在0/1两种工作状态之间切换，从而实现反射电磁波能量干涉相消。仿真结果表明，编码超表面阵列在2 GHz~4 GHz内相对于同尺寸的金属板能够实现15 dB以上的RCS减缩。

Abstract:

Firstly, an electronically controlled 1-bit coding unit covering S-band is designed, and its equivalent circuit analysis and parameter optimization are carried out. The phase difference of the unit is 180° under two working states of 0/1; On this basis, the design of 9×9 metasurface array is completed. By adjusting the bias voltage at both ends of varactor, the working state of each unit is changed to eliminate the interference of reflected electromagnetic wave energy. The simulation results show that the coded metasurface designed in this paper can achieve RCS reduction of more than 15 dB compared with the metal plate of the same size in the range of 2 GHz~4 GHz.