A new toroidal metamaterial phase shifter

Abstract

AbstractIn this paper, the design of a rectangular waveguide metamaterial (MTM) phase shifter will be introduced in X band. The main disadvantages of the class of waveguide MTM phase shifters include high insertion loss (about 10 dB) and high DC magnetic bias field requirement (6‐7 kOe), that treated in the proposed phase shifter scheme by using toroidal shape ferrite core in conjunction with metalized parallel microstrip lines and implementing the multi‐section matching network, that leads to 3.2 dB insertion loss and a simple bias mechanism such as conventional toroidal phase shifter without consisting any high reluctance air‐gap, which could be implemented by no need of any feather coil system or higher current values. The results of simultaneous ENG and MNG design procedure for 288° differential phase shift with the 2 cm ferrite core length, shows 4 times compactness of proposed phase shifter in comparison with conventional toroidal phase shifter.