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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。
Pattern matching method is used to analyze the eigenvalue problem of double ridge waveguide, and the eigenvalue equation is obtained. The genetic algorithm combined with dichotomy is used to solve the problem numerically and the main mode eigenvalue and the cutoff wavelength are obtained. Based on the above method, the working bandwidth of the main mode under the symmetrical feed is calculated and verified by simulation. Finally, a wideband double ridge horn antenna is designed. Simulation results show that the antenna has a VSWR of less than 2 in the frequency band from 1 GHz to 10 GHz, the directional pattern is not split, and the near-constant E-plane lobe width is within 2 to 10 GHz.