窄边双脊波导传输特性分析

Analysis of Transfer Characteristic of Double-Ridge Position on the Short Side of Waveguide

传统脊波导的脊位于长边,与矩形波导相比,具有较大的截止波长、较宽的单模带宽和较低的阻抗等优点。这方面的论文很多。迄今为止,没有关于窄边双脊波导的研究报道。本文采用亥姆霍兹方程有限差分法分析,从而获得精确的窄边双脊波导传输特性参数。计算结果与传统的双脊波导相比较,窄边双脊波导减小了单模带宽,因此可作为有效的脊带宽滤波器。

The ridge of conventional waveguide is on long side, compare to the normal rectangular waveguide, ridge waveguide possess several unique characters： larger dominant cutoff wavelength, wider single-mode bandwidth, lower equivalent characteristic impedance. Many letters have discussed it. So far, the double-ridge position on the short side of waveguide has not been discussed and reported. Helmholtz equation finite difference method is analyzed and applied to it. Exact transmission characteristic parameters are obtained. Contrasting result with conventional double-ridge waveguide, it shrinks sing - mode bandwidth, so it is an effective ridge bandpass filter.