Implementation of tunable microwave planar circuits based on liquid crystal

Abstract

The study presented in this paper deals with the implementation of liquid crystal-based (LC) tuneable microwave devices in order to underline the tunable capabilities assigned to LC. Experimental results obtained with LC-based phase-shifters are reported and highlight technological limitations that led us to propose a new approach. To validate the improvements made in the technological process, first-and second-order Dual Behaviour Resonator (DBR) filters at 5 GHz were achieved and measured.

Microwave study of tunable planar capacitors using mn-doped ba0.6sr0.4tio3 ceramics

“…despite some persistent problems of process dispersions, microelectromechanical systems (mEms) components proved to be a reliable solution [1], [2]. liquid crystals were also used to design microwave tunable phase shifters and filters [3], [4]. Performance of such devices is however weakened by very low switching times.…”