Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 13, Issue -, Pages 1581-1584Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2014.2345841
Keywords
Liquid crystals; metamaterials; tunable materials
Funding
- German Research Foundation within the DFG [DA 1275/2-1]
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In this letter, a voltage-tunable gradient-index fishnet metamaterial is presented. The unit cells of the fishnet are loaded with nematic liquid crystal material providing a continuous tuning of each column of the array. By introducing a voltage gradient over the width of the fishnet, the phase distribution over the aperture can be tuned, and thus the radiation direction can be controlled. The beam-scanning capability is demonstrated by simulation and measurements, and their comparison is discussed. The maximum measured scan angle using an array at a frequency of 27.5 GHz is +/- 5 degrees requiring a maximum tuning voltage of only 20 V. The presented prototype including the biasing scheme, fabricated with standard technology processes, features a low weight compared to conventional lenses.
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