The transmission control of electromagnetic wave in a band by adjusting structure parameters of fre-quency selective surface: ( FSS) is an important part in the study field of filters. In order to realize width bands prop-erties of ring loop element FSS in Ku frequency band, and clear effect of structure parameters for transmission proper-ties, ring loop unit FSS was numerically analyzed and optimizationally designed base on the spectral domain method, t including the size, the width and the period of array. The result of numerical analysis shows that the main influence factor of resonant frequency was the size of unit, and chief control factor of the width of transmission band was the width of unit. When the outside radius was 3.5mm, the width of unit was 0. 66mm and the the period of array was 10.0mm, the resonant frequency was 14. 8GHz, the transmission band was in Ku wave range and the width of band was 5.7GHz,. The FSS structure realizes width bands transmission in Ku frequency band by optimization design.%通过调整频率选择表面(FSS)单元的结构参数来控制电磁波在某雷达波段内的传输是滤波器研究领域的重要内容.为实现圆环形FSS单元在Ku波段的宽带传输特性,并明确单元结构参数对其传输特性的影响规律,采用谱域分析法,从圆环形单元的大小、宽度、阵列周期等方面,对圆环形单元FSS进行了数值分析和优化设计.仿真结果表明,谐振频率点的主要影响因素为单元大小,而单元宽度主要控制传输带宽.经优化,当单元外半径为3.5mm,单元宽度为0.66mm,阵列周期为10.0mm时,谐振频率为14.8GHz,FSS传输带位于Ku波段内,传输带宽达5.7GHz.优化后的FSS结构适用于Ku波段宽带传输,为优化设计提供了依据.
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