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从传输线等效电路理论出发,设计了一种基于有源频率选择表面(active frequency selective surface,AFSS)雷达吸波结构,最上一层是表面层,为AFSS衬底;中间层是AFSS层,由频率选择表面(frequency selective surface,FSS)和多个PIN二极管组成;第三层为泡沫材料组成的介质层。由反射率测量结果表明,改变加载到PIN二极管两端的直流电压可以控制其反射特性,实现吸波效果灵活可调。另外,利用正弦波作为加载信号也可实现动态地调控;当正弦波频率分别为100 k Hz、1 MHz和5 MHz时,反射率在3.2~5.6 GHz频段内可获得优于-10 d B的吸波效果。
Based on the theory of transmission line equivalent circuit, a radar structure based on active frequency selective surface (AFSS) is designed. The top layer is the AFSS substrate. The middle layer is the AFSS layer. Frequency selective surface (FSS) and multiple PIN diodes; and the third layer is a dielectric layer of foam material. Reflectance measurement results show that changing the DC voltage applied to both ends of the PIN diode can control its reflection characteristics and achieve a flexible and adjustable absorbing effect. In addition, the use of sine wave as a loading signal can also be dynamically adjusted; when the sine wave frequencies are 100 k Hz, 1 MHz and 5 MHz, the reflectivity in the band 3.2 ~ 5.6 GHz can be obtained better than -10 d B Wave absorption effect.