Design of a phase shifter with improved bandwidth using embedded series-shunt switches

A phase shifter with improved bandwidth using embedded series-shunt switches is presented. The FET switches become part of phase shifting filter elements as well as series-shunt switches. This improves the bandwidth of phase shifter because of having intrinsic characteristics of a high-pass and low-pass phase shifter. A phase shifter using resonated FET circuit is analyzed and compared. The conditions of circuit elements are derived in analytic form, which are used to obtain broadband phase characteristic. Two types of a Ku band 90° phase shifter are designed. The proposed phase shifter exhibits more broadband phase characteristic than the resonated FET topology. The proposed approach enables to realize a compact phase shifter with broadband performance.