Tunable phase shifter in substrate integrated waveguide

Abstract

In this paper, A variable substrate integrated waveguide (SIW) phase shifter is presented. The phase shifter is formed by capacitively coupling varactors to a longitudinal slot on a SIW. Compared to other SIW phase shifters, our design is tunable, and only occupies 7.5mm longitudinal length. Experiment results indicate the device is shown to have up to 60 degrees phase shift in the 5.3 – 6 GHz range with insertion loss better than 3 dB and return loss generally better than 20 dB.