Study on Liquid Crystal Millimeter-wave Control Device Obtained with the Integration on Planar Type Waveguide

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Planar type millimeter-wave liquid crystal (LC) phase shifter is developed based on the micro-strip-line. Structure of the conversion circuit, which is the key part of the novel LC phase shifter, is optimized to improve the operational frequency. Transmission loss of the phase shifter especially in the high frequency region is significantly improved and operational frequency comes up to the millimeter wave region over 50GHz.LC Molecular orientation state under the meander electrode structure, which is useful for downsizing the device, is investigated in detail. Basic molecular orientation phenomena are also investigated by using negative dielectric anisotropic LC material, which is necessary for complementary operation. Based on these results, integration of antenna array system with the LC phase shifter is investigated.