Study on reconfigurable corrugated waveguide using moveable shorting plate

A reconfigurable corrugated waveguide using moveable shorting plate utilized in beam steerable slot array antenna is proposed. Each antenna elements is fed through waveguide with multiple corrugations. The corrugation depth is changed by mechanically shifting shorting plate to change transmission phase. Meanwhile, it is an issue that is degradation of the reflection coefficient when depth of each corrugation is changed. We have proposed the way to decide combination of three corrugations depth which can shift transmission phase with low reflection coefficient. Simulation result for the proposed corrugated waveguide shows that phase shift of 230 degree is achieved with reflection coefficient less than −40dB.