Design of High Isolation Waveguide Switch Component in Ka Band for SAR System

A design of waveguide switch component in Ka band for SAR system is proposed in this paper, which can realize the function of switching between main/backup channels and several operating modes of SAR system. The microwave performance of the waveguide switch is improved by adapting the choke ring in the circumferential direction and the polarization choke in the axial direction. Through the combination of six waveguide switches, the isolation level between channels is promoted in the whole band. The electromagnetic analysis of the waveguide switch model is carried out by using the full-wave simulation, and its merit of VSWR less than 1.30, insertion loss less than 0.8 dB and isolation level better than 85 dB are verified by physical test.