基于双谐振棋盘式超表面的宽带RCS缩减技术

Wideband Radar Cross-Section reduction on checkerboard

摘要:

为实现宽频带的雷达散射截面（RCS）缩减效果，提出一种基于棋盘式超表面的RCS缩减技术，可达到宽带RCS缩减且极化不敏感的效果。介绍了提高RCS缩减带宽的原则，设计了X波段的棋盘式超表面，通过电磁散射对消技术，电磁波经超表面反射后分散向不同的方向，实现了异常反射从而降低RCS。与普通棋盘式超表面不同，为了克服一般超表面都有的相位收敛问题，提出了双谐振棋盘式超表面，即用两种谐振频率不同的结构组成双谐振单元结构，使单元具有均匀相位差的频段得以拓宽，从而扩展了超表面的缩减带宽，实现了10 dB缩减带宽达到8 GHz~14.5 GHz且极化不敏感的效果，通过仿真证明双谐振棋盘式超表面可以实现宽频率范围的RCS缩减效果，且极化不敏感。

Abstract:

In order to achieve broadband Radar Cross-Section(RCS) reduction, a RCS reduction technology based on checkerboard metasurface is proposed, which can achieve broadband RCS reduction and polarization with insensitivity. We also introduces the principle of improving the RCS reduction bandwidth and designs a X band checkerboard metasurface by the electromagnetic scattering canceling technology so that the electromagnetic wave is dispersed to different directions after the reflection of the metasurface, in which way the RCS of it is reduced. In this study, double-resonant checkerboard metasurface is putted forward to overcome the problem of phase convergence which is common among ordinary checkerboard metasurfaces. Double-resonant checkerboard metasurfaces consist of two different structures of two different resonant frequency can broaden the unit homogeneous phase difference, in which way the 10 dB RCS reduction bandwidth is from 8 to 14.5Ghz with polarization andinsensitivity. The simulation results show that the double-resonance checkerboard metasurface can realize RCS reduction of wide bandwidth and polarization with insensitivity.