Design of Coaxial Rotary Joint Using an Overmoded Coaxial Cavity with developed Single Channel Prototype

摘要

A four channel high power microwave rotary joint using oversized (overmoded geometry) concentric coaxial waveguides is proposed. The rotary joint is designed to consist of two channels operating at Ku-band and two channels operating at C-band. The simulated return loss, insertion loss and inter-channel isolation is presented with 360-degree rotation. The oversized geometry is most suitable for successful realization of a coaxial 4-channel rotary joint without having any RF and mechanical realization difficulties. This configuration allows for greater diameter for innermost channels which have larger lengths compared to outer channels as against conventional coaxial configuration where cavity dimensions are based on dominant mode operation only. A single channel prototype rotary joint is developed at Ku-band as proof-of-concept. The results are presented.