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Liquid Crystal Tunable mm Wave Frequency Selective Surface

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9 Author(s)
Wenfei Hu ; Queen''s Univ. of Belfast, Belfast ; Dickie, R. ; Cahill, R. ; Gamble, H.
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A frequency selective surface (FSS) which exploits the dielectric anisotropy of liquid crystals to generate an electronically tunable bandpass filter response at D Band (110-170 GHz) is presented. The device consists of two printed arrays of slot elements which are separated by a 130-mum thick layer of liquid crystals. A 3% shift in the filter passband occurs when the substrate permittivity is increased by applying a control signal of 10 V. Measured results show that the insertion loss increases from -3.7 dB to -10.4 dB at resonance (134 GHz), thus demonstrating the potential to create a FSS which can be switched between a transmitting and a reflecting structure.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:17 ,  Issue: 9 )