宽带天线设计中双脊波导的研究

Double ridged waveguide study for broadband antenna design

采用模式匹配法对双脊波导的特征值问题进行分析,得出了特征值方程。应用结合二分法的遗传算法进行数值求解,求出主模特征值以及截止波长。在上述方法的基础上,计算并仿真验证了双脊喇叭天线设计中对称馈电下的主模工作带宽,最后设计了一个宽带双脊喇叭天线。仿真结果表明,该天线在1~10 GHz频带内驻波比小于2,方向图没有分裂,并且在2~10 GHz内具有接近恒定的E面波瓣宽度。

The mode-matching method （MMM） was applied to analyze the eigenvalues of double ridged waveguide, thus the eigenvalue equation was obtained. Numerical results for the eigenvalues and cutoff wavelengths of dominant-mode were presented by the way of a genetic algorithm combined with dichotomy. The dominant-mode bandwidth with symmetrically feeding in the design of double ridged horn antenna was calculated by MMM, and the antenna was verified by simulation. A practical design of broadband double ridged horn antenna was presented. Simulating results show this horn antenna has a VSWR less than 2 in 1 -- 10 GHz without any pattern breakup over the entire frequency band, and achieves almost constant E-plane bearnwidth from 2 GHz to 10 GHz.