过模同轴转弯波导的设计

介绍了一种过模同轴转弯波导的基本原理,分析了过模同轴波导基模实现高效率转弯传输的条件及转弯过程中的模式问题,设计了中心频率为4.0GHz、转弯角度为45°的过模同轴转弯波导。数值计算结果表明:过模同轴转弯波导在中心频率的基模传输效率大于99%,反射系数为0.04;在3.8~4.2GHz的频率范围内基模传输效率大于95%,反射系数小于0.22。该过模同轴转弯波导的转弯半径约80mm,具有转弯半径小、结构简单、转弯角度灵活的特点,且内部无介质支撑,适用于高功率微波馈线系统中过模同轴波导基模的转弯传输。

Design of an overmoded bend coaxial waveguide

This paper presents a novel type of overmoded bend coaxial waveguide with a 45° bend angle at a center frequency of 4.0 GHz. The basic principle of the overmoded bend coaxial waveguide is introduced, and the condition of realizing high efficiency turning transmission and a mode problem on the overmoded waveguide are analyzed. The simulation result indicates that, at the center frequency, the transmission efficiency of the fundamental mode is over 99% and the reflectance is about 0.04. In the range of 3.8 to 4.2 GHz, the transmission efficiency of the fundamental mode is over 95% and the reflectance is below 0.22. The overmoded bend coaxial waveguide with a turning radius about 80 mm, which has the features of simple structure, small turning radius and flexible bend angle, and also needs no media support, is suitable for turning transmission of the overmoded coaxial waveguide in high power microwave feeder system.