A Digital SIW Phase Shifter Implemented by Switching Transverse Slots via PIN Diodes

摘要

A new idea of Substrate integrated waveguide (SIW) based digital phase shifter by controlling the transverse slots etched over the top metallic surface of SIW is proposed. A PIN diode is mounted on each transverse slot. Slots are made "enabled" or "disabled" by switching the state of PIN diode. A detailed explanation and demonstration is presented in this paper. As a result, a digital four bit phase shifter can be realized. Furthermore, equivalent circuit model for proposed device has also been discussed. Insertion loss is as low as 1.5 dB for a wide bandwidth of 31% (6.75-9.25 GHz), with a phase imbalance of +/- 4 degrees and amplitude imbalance of +/- 0.5 dB. Simulation results agree well with the measured results.