The use of liquid crystals for tunable devices has already been investigated for phase-shifters and antennas in planar technology. Here, the focus is, first, on a half-wavelength open-circuited stub resonator, then on a second-order dual behavior resonator filter. To have the benefit of liquid crystal anisotropy and thus obtain agility, a bias voltage is applied to the device under study. In order to avoid the shift observed between simulated and measured results of the half-wavelength open-circuited stub for the first structure, the technological process has been improved for the second one in the aim to reduce mismatching and LC leaking.Index Terms -Liquid crystal, tunable filter, dual behavior resonator.
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.
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