MODIFIED BROADBAND SCHIFFMAN PHASE SHIFTER USING DENTATE MICROSTRIP AND PATTERNED GROUND PLANE

Abstract

In this letter, a modifled broadband 90 - phase shifter is proposed. By using a dentate microstrip and a patterned ground plane, an extremely tight coupling can be obtained, and consequently a constant phase shift over a wide bandwidth can be achieved. To verify the proposed idea, a topology is implemented, the measured results of a phase difierence of 90 § 5 - in 79.5% bandwidth, better than 10dB return loss across the whole operating band, are also given. The measurement results agree well with the full-wave electromagnetic simulated responses.