Controllable Liquid Artificial Dielectric S-Band Phase Shifters

Abstract : The report describes the work done to prove the feasibility of developing a new class of microwave phase shifters based on the concept of electrically controllable liquid artificial dielectrics using metallic suspension. The theory of operation shows the explicit relationship between material parameters and device performance characteristics. A new electrode design configuration is described that reduces insertion loss characteristics. Results show that particle agitation is not required. Test data of metallic suspensions, liquid crystals, and certain proteins are given. Test data are given for insertion loss characteristics, VSWR, and phase shift as a function of applied voltage over the band of frequencies from 2.7 to 2.9 GHz.