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近年来,N.Nakajima等对4、5、6GHz共用天线波导系统中一种高性能偏置激励的卡塞格伦微波天线所用多模圆弯曲波导的传输特性及其高次波型E_(01)~O的影响进行了分析和实验研究,而文中对弯波导所激发的另一重要高次波型H_(21)~O的影响和有效地处理方法并未解决。本文根据任意截面弯曲波导耦合波方程组分析并计算了H_(11)~O多模圆弯曲波导内高次波型耦合特性及其前两个最重要的较低阶高次波E_(01)~O、H_(21)~O的耦合系数和波型激发量,提出了一种宽频带H_(21)~O、E_(01)~O波型滤波器,实验表明波型滤波器的实用效果良好,从而使N.Nakajima等遇到的并待克服的问题可基本解决。
In recent years, N.Nakajima et al. Propagation characteristics of a multi-mode circularly curved waveguide used in a high-performance biased-excited Cassegrain microwave antenna in a 4,5,6 GHz shared-antenna waveguide system and its higher order E_ (01) ) ~ O is analyzed and experimentally studied. However, the influence and effective treatment method of H_ (21) ~ O, another important high-order wave excited by curved waveguide, are not solved. In this paper, the coupled characteristics of high order modes and the first two most important lower order high order E_ (01) modes in H_ (11) ~ O multimode circular flexure waveguides are analyzed and calculated according to the coupled wave equation of flexural waveguide with arbitrary cross section. (21) ~ O, H_ (21) ~ O, and a type of H_ (21) ~ O, E_ (01) ~ O wave filter have been proposed. The experiments show that the wave filter is practical So that the problems encountered by N. Nakajima and others to be overcome can be basically solved.