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毫米波/红外复合制导半实物仿真中需要使用二向色镜,用于透射毫米波、反射红外,提出了用分形频率选择表面(FSS)实现二向色镜的方法,设计了一种8mm和3mm波段双频带通的Y环分形FSS,基于频域有限差分法(FDFD)和周期边界对其进行了仿真分析,并进行了实物研制。仿真和测试结果表明,该分形FSS结构具有稳定而优良的频率特性,同时圆极化性能好、工程实现简单,而且对大于5μm的红外信号反射率最高接近90%。特别是这种二向色镜可以同时应用于8mm和3mm波段毫米波/红外半实物仿真系统,具有良好的复用特性,因此有很好的应用前景。
In the semi-physical simulation of millimeter-wave / infrared hybrid guidance, a dichroic mirror is needed to transmit the millimeter wave and reflect the infrared. A method of realizing the dichroic mirror with a fractal frequency selective surface (FSS) is proposed. An 8mm and The Y-ring fractal FSS with 3-band dual-band passband is simulated and analyzed based on FDFD and periodic boundary. Simulation and test results show that the fractal FSS structure has stable and excellent frequency characteristics, good circular polarization performance and simple engineering, and the reflectivity of infrared signals larger than 5μm is up to 90%. In particular, this dichroic mirror can be used in both millimeter-wave / infrared semi-physical simulation systems of 8 mm and 3 mm bands and has good multiplexing characteristics and therefore has good application prospects.