3c08 Liquid Crystal Loaded Microwave Phase Shifter Using Microstrip Line to Coplanar Waveguide Transition

Abstract

A broadband liquid crystal loaded microstrip-line (MSL) to coplanar waveguide (CPW) transition with easy-to-make structure and highly efficient transmission for various applications in microwave bands devices of liquid crystal is proposed in this study. The fabricated transitions provide insertion loss less than 2dB and return loss of about 10dB for frequencies from 10GHz to over 30GHz. In addition, to downsize liquid crystal loaded microwave device, a liquid crystal molecular orientation control circuit, composed of bias T and low frequency reject filters, is integrated into the transition substrate.