紧凑型频率选择表面在单极子天线阵解耦中的应用研究

摘要

A minimum structure of frequency selective surface(FSS)was designed by constructing many gaps and rings on the rectangular metal patch. The size of this structure of 0.063λ0 × 0.063λ0(λ0 is the operating wavelength of the antenna in free space)is extremely small. The frequency response characteristic of the proposed structure is deeply analyzed and discussed with CST software. The structure has perfect band⁃stop characteristic,angle and polarization stability. A binary monopole antenna array was designed based on the frequency selective characteristic of the proposed FSS. The space⁃wave coupling among the an⁃tennas can be effectively restrained by loading the FSS among the antennas,and the cross⁃coupling among the antennas is re⁃duced by 9.7 dB. The antenna has high gain and good directivity. The FSS has broad application prospect in the aspect of designing the high performance antenna array.%通过在方形金属贴片上构造大量缝隙和环，改进设计了一种小型化频率选择表面结构，其电尺寸极小，仅为0.063λ0×0.063λ0（λ0是天线在自由空间工作波长）。采用CST软件对这种结构的频率响应特性进行了系统的分析和讨论，其具有良好的阻带特性以及角度和极化稳定性。基于该频率选择表面的频率选择特性设计了一款二元单极子天线阵，通过在天线间加载频率选择表面，有效地抑制了天线间的空间波耦合，使天线间互耦下降了9.7 dB，并且天线增益提高、方向性变好。因此，该频率选择表面在设计高性能天线阵方面具有广阔的应用前景。