基于金属孔径和介质柱的陡截止频率选择结构设计

Design of the Fast Cut-off Frequency Selective Surface Based on Metal Holes and Dielectric Columns

基于频率选择表面(FSS)的透波/隐身天线罩是实现天线带外雷达散射截面缩减的有效措施,提出一种基于金属孔径和介质柱混合结构的高通透波频率选择结构,实现了带内低损耗透波和带外陡截止滤波。随着电磁波入射角度增大,文中提出的FSS仍具有良好的截止性能。研究了频率选择结构厚度对传输性能的影响,随着厚度增加,带外电磁波的截止更加陡峭。优化设计了一种在19.30 GHz~25.80 GHz频段透波的频率选择结构,在0°~45°入射角度范围内,该结构的透波损耗小于0.54 dB;在P-18 GHz频段内,对任意角度入射的双线极化电磁波的截止高于-8.67 dB。该新型FSS基本可满足透波/隐身罩对P-18 GHz宽频段雷达电磁波,及雷达任意角度照射情况下的截止需求。

Transmission/stealth radome based on FSS is an effective method to reduce the out-band radar cross scatter(RCS)of antenna.The high-band pass FSS composed of metallic holes and dielectric is proposed,by which the low in-band return loss and the fast cut-off is realized.The good cut-off property is still kept for the proposed FSS when the incident angle of the wave gets bigger.The effect on the transmission of the thickness of the proposed FSS is studied,which shows that the out-band cut-off property gets faster with the increase of the thickness.The FSS with the transmission band of 19.20 GHz-25.80 GHz is optimized.The return loss is smaller than 0.54 dB within the incident angle of 0°-45°.In the band of P-17.85 GHz,the cut-off is higher than 10 dB for the dual linear polarize wave within the incident angle of 0°-80°.The proposed FSS can improve the stealth ability of the transmission/stealth radome on the condition of the bigger incidence of the radar wave.