Single-Layer Wide-band 45 Degree Phase Shifter with Filter Function

In this paper, a single-layer wide-band phase shifter is proposed, achieving 45 degree phase shift from 1.6GHz to 4.16GHz, and meanwhile exhibiting a band pass filter response. The proposed phase shifter is composed of a stub-loaded transmission line (SLTLs) with a delay line and an Open-circuited three-line MMR (OPTLMMR), both providing filter function. Constant phase shift is obtained by adjusting the phase slopes of main path and reference path.