一种超薄宽带频率选择雷达吸波体的仿真设计

Simulation Design of an Ultra-Thin Wideband Frequency Selective Rabsorber

为了减小雷达散射截面,增加飞行器隐身功能,提出了一种新型的超宽频率选择雷达吸波体(FSR)结构。FSR具有带内传输、带外吸收电磁波的特点。设计的FSR结构由无损传输层和有损吸波层组成,中间用空气隔开。无损传输层采用十字缝隙与集总电容构成,用于实现高性能带内传输。吸波层设计了工字形与方形的组合结构,在吸收带内产生两上谐振频率,实现超宽带吸波。仿真结果表明,设计的FSR能够在中心频率为2.17GHz上实现高性能传输,其插入损耗仅为0.43dB,吸波带宽从5.8GHz到14.7GHz,其相对带宽达到86.8%。新型FSR能够实现带内通信,并吸收带外电磁波,从而能够有效减小飞行器的雷达散射截面。

To reduce the radar scattering cross section and increase the stealth function of aircraft,a novel ultra-wide frequency selective rabsorber(FSR)structure is proposed,which has the characteristics of in-band transmission and out-band absorption.The FSR is constructed by lossless transport layer and lossy absorbing layer separated by air.For lossless transmission layer,Jerusalem cross and lump capacity is utilized to obtain high performance in-band transmission.The absorber layer is composed of I-shaped and square-shaped structure,which generates two resonant frequencies in the absorber band to realize ultra-wideband absorption.The simulation results show that the designed FSR can realize high performance transmission at the central frequency of 2.17 GHz,with insertion loss<0.43 dB,and the absorption bands with more than 10 dB reflection reduction range from 5.8 to 14.7 GHz,and the FBW reaches 86.8%.The designed FSR can realize the in-band communication and absorb the out-of band incident wave,thus effectively reducing the radar scattering cross section of aircraft.