基于CSRR结构的低RCS 微带天线设计*

基于互补开口谐振环奇异的折射率特性,研制了一种可用于雷达低可见平台的新型微带天线.采用等效分析方法对CSRR结构的等效媒质参数加以研究,并将其应用于普通微带天线非辐射边一侧的接地板上,在保证天线辐射特性基本不变的同时使散射波远离镜像方向,从而实现在空域中的带外雷达散射截面积减缩.仿真和测试结果表明,加载CSRR结构的微带天线仍为线极化,前向增益仅损失0.32dB,对于不同角度入射波镜像方向RCS均有减缩,其中法线方向RCS最大减缩量达到7.8dB.该设计具有低成本、设计简单、便于加工、利于共形等优点,为天线RCS减缩提供了新思路.

Design of Low RCS Microstrip Antenna Based on CSRR Structure

Based on the peculiar refractive index feature of complementary split ring resonator (CSRR), a novel low visible platform microstrip antenna is proposed. Equivalent analysis method has been adopted to study the refractive index of a CSRR structure. By loading the structure on the nonradiative side of the antenna ground plane and distract the scattered waves from mirror direction, a spatial reduction of out-bands radar cross section (RCS) is achieved, while the radiation performance is kept. Simulation and measured results demonstrate that the novel microstrip antenna maintains linear polarization and get 7. 8dB nose aspect RCS reduction with only 0. 32dB positive gain loss. The design owns the merits of low cost, simple design, easy for fabrication and conformation, providing a new idea for antenna RCS reduction.