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为了实现频率选择表面(FSS)的双带特性,设计了由矩形栅格和三圆环组合单元FSS。对FSS的谱域求解方法进行了详细的描述。采用谱域法分析了不同角度和极化入射波下FSS的频率响应性能。结果表明,所设计的FSS对于不同入射角度和极化电磁波具有稳定的双带、平顶传输及陡峭下降边缘特性。双带特性大致表现为1.8～5.4GHz的阻带和5.4～20.0GHz的通带。阻带谐振频率稳定在3.1GHz左右,而通带在-4dB的平顶传输带宽达14.3GHz以上。其陡峭下降边缘特性表现为S波段信号强烈反射,而其他波段信号通过,从而实现多波段通讯。该结构FSS可应用于卫星通信、雷达罩及其他相关领域。
In order to realize the double-band characteristics of frequency selective surface (FSS), a combination of rectangular grid and three ring FSS was designed. The method of solving the spectrum of FSS is described in detail. Spectral domain method was used to analyze the frequency response of FSS under different angles and polarized incident waves. The results show that the designed FSS has stable double band, flat top transmission and steep descending edge characteristics for different angles of incidence and polarized electromagnetic waves. The characteristics of double-band are roughly shown in the stop band of 1.8 to 5.4 GHz and the pass band of 5.4 to 20.0 GHz. The stopband resonant frequency is stabilized at about 3.1GHz, while the passband is at -4dB above the flat top transmission bandwidth of 14.3GHz. Its steep descending edge is characterized by a strong reflection of the S-band signal while signals from other bands pass to enable multi-band communication. This structure FSS can be applied to satellite communications, radomes and other related fields.