Frequency adjustable Ka Band Cross-Guide coupler for space applications

This paper presents a new frequency adjustable Ka Band Cross-Guide coupler for space applications. Up to now Cross-Guide couplers were designed for a fixed frequency range and tuning screws were used to compensate fabrication tolerances. This work utilizes the tuning screws not only to correct fabrication tolerances but also to adjust the frequency of operation. The design strategy and test of the fabricated device are presented in this article, obtaining very good results in Ka Band such as 30 dB coupling and more than 20 dB directivity for all frequency ranges.