宽带频率选择吸波器设计

Design of Wideband Frequency Selective Absorber

本文提出了一种宽带的频率选择吸波器。此频率选择吸波器采用双层结构,上层为电阻加载的金属十字框架结构,下层为环形槽金属,两者相结合就得到了一种简单的双层频率选择吸波器。仿真结果表明,10dB吸收带宽为3.16GHZ,在4.41GHz时可获得0.57dB的插入损耗,带内信号传输良好,在2.26GHz和7.7GHz得到两个吸收峰,吸收率分别达到83.3%和92.4%。此频率选择吸波器能够吸收带外的反射波,同时可以良好的透射带内电磁波,因此可以用来减少雷达散射截面(RCS)增强隐身功能。

A wide-band frequency selective absorber is presented in this paper.This frequency selective absorber is a two-layer structure,the upper layer is a metal cross frame structure loaded with resistance,and the lower layer is a metal ring slot.A simple two-layer frequency selective absorber is obtained by combining the two.The simulation results show that the 10 dB absorption bandwidth is 3.16 GHz and 0.57 dB insertion loss can be obtained at 4.41 GHz.The in-band signal transmission is good.Two absorption peaks are obtained at 2.26 GHz and 7.7 GHz,with absorption rates reaching 83.3%and 92.4%,respectively.This frequency selective absorber can absorb the reflected wave outside the band and transmit the electromagnetic wave inside the band well.Therefore,it can be used to reduce the radar scattering cross section(RCS)and enhance the stealth function.