volume | PIER Journals

Abstract

A coupled-line circuit structure is proposed in this paper to design a modified Schiffman phase shifter with short reference line. Based on the traditional transmission line theory and ABCD parameters, closed-form mathematical equations for electrical and scattering parameters are obtained. Obviously, this proposed coupled-line phase shifter has several advantages such as arbitrary phase difference, easy implementation, and analytical design method. Finally, two examples of microstrip coupled-line phase shifter, which have fractional bandwidth over 45%, are fabricated and measured. Good agreements between the simulated and measured results verify our design.

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Mr. Weiwei Zhang

Dr. Yuan'an Liu

Prof. Yongle Wu

Dr. Weimin Wang

Dr. Ming Su

Dr. Jinchun Gao