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A new tunable planar resonator based on nematic liquid crystals (LC) substrate for applications at mm-wave frequencies is presented. The proposed structure utilizes an electric field bias to align the LC molecules, offering direct control over the dielectric properties (anisotropy) of the LC substrate. The LC used is a mixture commonly referred to as E7. A tunability of about 6% is achieved in the...
Due to their large birefringence and moderately low loss, liquid crystals (LCs) are a promising dielectric media for development of a variety of reconfigurable millimeter-wave devices. In order to optimize the design of tunable millimeter-wave devices, accurate values of the dielectric and elastic constants, as well as the loss tangents of LCs, are needed. However, characterization of LCs at millimeter-wave...
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