基于可重构频率选择表面的天线RCS减缩研究

Research on Antenna Radar Cross Section Reduction Based on Reconfigurable Frequency Selective Surface

针对天线雷达截面减缩问题,该文提出一种基于二极管控制的可重构频率选择表面结构,并将其用于天线的雷达截面减缩技术。论文将可重构技术应用于频率选择表面设计,使得频率选择表面可以在带通型以及带阻型之间进行相互切换。为了在保证天线辐射特性的前提下降低天线的雷达截面,该文考虑将可重构频率选择表面作为天线反射板用以置换一般的金属反射板。通过二极管导通/截断使得可重构频率选择表面反射板处于不同状态,以实现天线在不同工作状态下的RCS减缩控制及切换。仿真及实测结果表明,使用可重构频率选择表面反射板,天线雷达截面的最大减缩量可达20 d B以上,减缩角域可达-60?￡q￡+60?,同时天线的辐射特性几乎未发生变化。该方法可在保证天线辐射特性的基础上极大程度降低天线的雷达截面,并能做到天线雷达截面减缩频段的可重构。

Active reconflgurable Frequency Selective Surface （FSS） using pin diode for the Radar Cross Section （RCS） reduction of antenna is proposed. The reconflgurable technology is applied to the FSS design. The reconflgurable FSS reflector is able to perform switch between band-pass FSS and band-stop FSS. The active reconflgurable FSS with pin diodes applies to the antenna reflector for the antenna RCS reduction, and the radiation performance of the antenna is preserved. Through the diode is on or off, the reconflgurable FSS reflectors are different states. It can contribute to the reconfigurable RCS reduction of dipole antenna under different working conditions. The simulated and measured results show the largest RCS reduction is more than 20dB, and the RCS reduction region is -60°≤θ≤＋60° . The radiation performance of the antenna is preserved when the diodes are ON-state. The active reconflgurable FSS provide a good method to solve the conflict between the gain enhancement and the RCS reduction. The reduction band and the state of the RCS can be switched by pin diodes.