Phase Shifters with Tunable Reflective Method Using Inductive Coupled Lines

Abstract

A coupler forms essential aspect of a phase shifters with tunable reflector, which is a 3 decibel quadrature coupler (?/4). In this paper, a model which shows that by reducing the length of the coupler a wide phase range is achieved for a reflective type phase shifter. The approach used in this method is by having a variable instead of constant Even and Odd impedances. The ultimate aim is to design a Reflective Type Phase Shifter which has a very low area, low return and insertion losses and a large phase range. The proposed model is done using Advanced Design System (ADS) and the results are verified for the frequency of 2.4GHz.