Design of 14–14.5GHz semiconductor microwave digital phase shifters

Abstract

A switched line microwave digital phase shifter and a hybrid coupler phase shifter using PIN diodes which are operated at center frequencies from 14GHz to 14.5GHz are presented. The former is able to realize 180 degree phase shift and the latter is able to realize 11.25 degree phase shift. The phase shifters are designed to implement on a microstrip circuit type. Both of the two phase shifters can achieve flat phase shift and low VSWR by adding open-end transmission lines to the circuit. The simulation result shows that the design is very effectual.