Differential phase shifters based on Schiffman type‐C and type‐F networks with wide phase shift range

Abstract

This study proposes a class of differential phase shifters based on the Schiffman type‐C and type‐F networks with wide phase shift range. After the phase and bandwidth properties of these two distinct networks are numerically analyzed, two unique advantages of wide phase shift range and wide phase shift bandwidth are revealed. Next, the optimal design parameters for different phase shift values up to 405° are presented to allow for a quick design process. To verify the proposed approach, a 180° differential phase shifter is designed, fabricated and measured. Good performance is achieved with an impedance ratio of 1.959 and 3.7° phase deviation over a phase shift bandwidth of 61%.

Design of broadband reconfigurable phase shifters

“…In the past few years, various previous works have been proposed to design all kinds of phase shifters. Among them, the Schiffman phase shifters, [5][6][7][8] branch loading phase shifters [9][10][11][12][13][14] have been advanced gradually. The Schiffman phase shifter, considered as one of the earliest designs that used the coupled lines to realize broadband phase shifters, consists of a section of transmission line and a folded edge-coupled transmission line for realizing a phase shift.…”