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为了实现双通带频率选择表面(FSS)在较厚介质基底、较大频带间隔和入射角度下的工程应用,设计制备了一种性能优良的Ku/Ka波段双频FSS结构.利用FSS栅瓣图分析了FSS具有稳定滤波特性的条件.应用矢量模式匹配法计算了基于分形技术和复合图形技术的FSS的传输特性.根据单元谐振模式和FSS传输特性归纳了厚介质基底、较远双通带FSS的设计原则,最终优化出一种由方环复合“Y”环单元组成的FSS结构.结果表明:该结构在6.7mm厚介质基底上0°—45°扫描范围内,在Ku/Ka波段具有稳定的双频传输特性,透过率均优于75%.这为设计基底厚度较大、频带间隔较远、入射角度要求较高的双带FSS结构提供了理论参考与实验依据.
In order to realize the engineering application of double passband frequency selective surface (FSS) under the condition of thicker dielectric substrate, larger band spacing and incident angle, a Ku / Ka band dual-frequency FSS structure with excellent performance is designed and fabricated.Using FSS grating lobe The condition of FSS with stable filtering characteristics is analyzed.The transmission characteristics of FSS based on fractal technology and composite graph technique are calculated by vector pattern matching method.According to the unit resonance mode and FSS transmission characteristics, FSS, the FSS structure composed of square ring composite “Y ” ring elements was optimized.Results show that the structure of the FSS structure in the range of 0 ° -45 ° on a 6.7mm thick substrate, Ka band has a stable dual-frequency transmission characteristics, the transmittance is better than 75% .This provides theoretical reference and experimental basis for the design of double-band FSS structure with larger basement thickness, longer band spacing and higher incident angle.