棋盘型结构在太赫兹宽频段RCS缩减中应用研究

Broadband Radar Cross- Section Reduction in Terahertz Wave Using Chessboard Configuration

本文设计了一种太赫兹波段薄的新型棋盘型结构,实现了宽频段RCS的缩减.该结构为不同尺寸的人工磁导体耶路撒冷十字型组成,通过优化单元结构,使反射相位差在较宽范围内保持在180±30度之间,从而降低后向散射能量,达到宽频段RCS的缩减.仿真表明在0.76-1.26THz范围内反射波在法向会相消,对应远场产生四个对称方向波束;该结构相对同尺寸的金属板相应的波段内RCS的缩减量达到10d B以上,最大缩减量达到25d B,与理论分析一致.总之,棋盘型结构为实现宽频段RCS缩减提供一种新的途径,将在成像、雷达隐身等方面具有重要的意义.

In this article,a thin and novel chessboard configuration was proposed,which can achieved the broadband radar cross-section（ RCS）reduction in THz frequency. This chessboard configuration is formed by combining artificial magnetic conduc-tor（ AMC）of Jerusalem Crosses with different dimensions. The difference reflection phase about 180 ± 30 degree can be a-chieved in the broadband frequency through the optimization the unit structure and the backscattering energy is reduced,so the radar cross-section reduction can be attained in the broadband frequency. The simulation results show that the reflectivity wave will be cancelled at the normal direction,and can generate four symmetrical directional beam,and radar cross section re-duction compared with bare metallic plate with the same size is more than 10dB within the same bandwidth,the maximum re-duction is up to 25 dB. The chessboard configuration open a new route to achieve the RCS reduction,so it is of great application values in imaging and stealth of THz frequencies.