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利用加载集总电阻的方式设计出一种极化稳定且宽入射角的宽带超材料吸波体(wide-band metamaterial absorber,WBMA),在平面波垂直入射时,其吸波半波功率带宽达12.7 GHz,吸波率大于90%的带宽达10.42 GHz,峰值吸波率达99.9%.将其与微带天线共基板共接地板的方式加载,制备出WBMA微带天线,实现了天线宽频域内雷达散射截面(radar cross section,RCS)大幅缩减.仿真与实测结果表明:将WBMA加载于微带天线后,天线的前向增益提高了0.53 d B,整体辐射特性基本保持不变;在不同极化波下,天线的工作频带带内和带外等宽频域(6.95—17.91 GHz)内的单站RCS缩减大于3 d B以上,最大缩减值达21.2 d B;在天线的中心频点8 GHz处±48°的宽角域内,双站RCS缩减效果明显,很好地实现了天线的宽频域大角度的隐身设计.
A wide-band metamaterial absorber (WBMA) with stable polarizations and wide angle of incidence is designed by using the method of loading lumped resistors. When the plane wave is incident perpendicularly, the half-wave power absorption bandwidth of the wave is 12.7 GHz, the bandwidth of more than 90% of the microwave absorption rate is up to 10.42 GHz and the peak absorption rate is up to 99.9% .At the same time, the WBMA microstrip antenna is loaded with the common ground plane of the microstrip antenna to achieve a wideband antenna radars The RCS decreases greatly.The simulation and experimental results show that the forward gain of the antenna is increased by 0.53 dB after the WBMA is loaded on the microstrip antenna, and the overall radiation characteristics remain unchanged. Under different polarization The single-station RCS reduction in the working band of the antenna in the band and in the out-of-band (6.95-17.91 GHz) is greater than 3 dB and the maximum reduction is 21.2 dB; at the antenna’s 8 GHz center frequency ± 48 ° wide-angle domain, double-station RCS reduction effect is obvious, a good realization of the wide-angle antenna stealth wide-angle design.