In this letter a novel substrate integrated waveguide (SIW) phase shifter is proposed. It consist of phase channels made by SIW with equal length and unequal width. Design equations and process are given with mathematical analysis. The propagation constant of the output signals have been adjusted by changing only the width of the output arms. As a result a novel phase shifter, is obtained accordingly. The experimental results of a prototype at 10 GHz shows 45 degrees phase difference between two outputs. Return loss and transmission coefficient are good agreement with simulation results in considered band.
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