一种高增益强定向波导缝隙天线

A High-gain and Directivity Enhanced Waveguide Antenna

设计并制备了一种在5．42～5．80GHz频带内反射系数相位曲线斜率为正（一般为负）、幅度模值均在0．83以上、具有部分反射特性的双屏频率选择表面，并将该FSS以覆层的形式加载到波导缝隙天线辐射方向上，使其具有更宽的带宽，更高的增益，更强的定向性。采用射线理论和Fabry—Perot谐振腔模型分析了新波导缝隙天线辐射改善机理，并进行仿真和实验验证。仿真和实测结果表明：相比原始天线，加载覆层后，天线带宽增加了34．6％，鼻锥方向增益提高了6．94dB，E、H面半功率主瓣宽度分别减小了24°和128°。

A double screen FSS with positive reflection phase gradient（the general with negative slope）, a- bove 0.83 reflection magnitude value and partially reflection features at 5.42-5.80GHz is designed and fab- ricated, the new waveguide antenan bandwidth is broadened, gain is improved and directivity is enhanced by applying the double screen FSS as a radome on the radiation orientation.The FSS radiation enhanced and scattering reduced mechanism are analyzed by adopting ray theory and Fabry-Perot resonator model, and the capabilities of new antenna are validated by simulation and experimentation. The results show that： the bandwidth of the antenna is increased by 34.6% and the gain of the antenna is enhanced by 6.94 dB, and the half-power beam width of E-plane and H-plane are reduced by 240 and by1280 respectively.