Abstract
The properties of metamaterials are now being investigated in a number of research centres. Structures such as split-ring resonators (SRR) have been developed to produce negative index materials (NIMs). Liquid crystals absorb over a broad range of wavelengths and have refractive indices which are extremely sensitive to temperature and external electromagnetic fields. Liquid crystals are therefore promising for the dynamic control of permittivity in metamaterials. A thermally controlled metamaterial structure employing a nematic liquid crystal (1801) has been characterised. It has been shown that using such liquid crystals in an anisotropic medium to construct useful materials, tunability of the effective parameters can be achieved. Measurements were performed at around 4.9 GHz.
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