利用谱域分析法研究了Y形与圆孔形组合单元频率选择表面（FSS）结构参数对频率响应特性的影响。该组合单元的频率响应特性同时兼有带通和带阻的双带特性。与其他结构参数相比，Y形单元的臂长对FSS频率响应特性具有至关重要的影响，臂长由2.0 mm增加至3.5 mm，带通谐振频率向低频漂移了4.2 GHz，带阻谐振频率向低频率漂移了7.0 GHz，在-5 dB的通带传输带宽减少了6.6 GHz，阻带传输带宽增加了4.4 GHz。

The effects of structure parameters of substrate on the frequency response characteristics of combination element frequency selective surface (FSS) which assembles Y element and circular aperture element are studied using the spectral domain method. Frequency response characteristics of the combination element FSS show double-band characteristic including band pass and band stop. Arm-length of Y element has a very important effect on FSS frequency response characteristic, compared with other parameters. When the arm-length is increased from 2.0 mm to 3.5 mm, the resonant frequency of band pass is drifted by 4.2 GHz and the resonant frequency of band stop is drifted by 7.0 GHz to low frequency, the transmission bandwidth of band pass is decreases by 6.6 GHz and the bandwidth of band stop increases by 4.4 GHz at -5 dB.