Design and experimental validation of liquid crystal-based reconfigurable reflectarray elements with improved bandwith in F-band

Raymond Dickie, Gerardo Perez-Palmino, Paul Baine, Michael Bain, J.A. Encinar, Robert Cahill, Mariano Barba, Giovanni Toso

Research output: Contribution to journalArticle

69 Citations (Scopus)
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Abstract

A reconfigurable reflectarray which exploits the dielectric anisotropy of liquid crystals (LC) has been designed to operate in the frequency range from 96 to 104 GHz. The unit cells are composed of three unequal length parallel dipoles placed above an LC substrate. The reflectarray has been designed using an accurate model which includes the effects of anisotropy and inhomogeneity. An effective permittivity that accounts for the real effects of the LC has also been used to simplify the analysis and design of the unit cells. The geometrical parameters of the cells have been adjusted to simultaneously improve the bandwidth, maximize the tunable phase-range and reduce the sensitivity to the angle of incidence. The performance of the LC based unit cells has been experimentally evaluated by measuring the reflection amplitude and phase of a reflectarray consisting of 52x54 identical cells. The good agreement between measurements and simulations validate the analysis and design techniques and demonstrate the capabilities of the proposed reflectarray to provide beam scanning in F band.
Original languageEnglish
Article number6420889
Pages (from-to)1704-1713
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume61
Issue number4
DOIs
Publication statusPublished - 2013

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