Title :
Preliminary design of a liquid crystal-based reflectarray antenna for beam-scanning in THz
Author :
Perez-Palomino, Gerardo ; Encinar, J.A. ; Dickie, R. ; Cahill, Ronan
Author_Institution :
Dept. of Electromagn. & Circuit Theor., Univ. Politec. de Madrid, Madrid, Spain
Abstract :
A 50.22 × 48.6 mm beam-scanning reflectarray based on liquid crystals (LCs) has been designed to operate over a bandwidth of 5.5% in the low THz frequency range. The structure consists of a single-layer multi-resonant periodic array with unit-cells composed of three parallel unequal length dipoles. The gap between the array and ground plane is filled with electronically tunable LC which exhibits a permittivity value that is controlled by a low frequency bias signal. The simulations demonstrate that the beam can be scanned over an angular range of ±10° yielding a gain greater than 35 dBi and maximum sidelobe levels of 25 dB from 335 to 354 GHz.
Keywords :
beam steering; liquid crystals; permittivity; reflectarray antennas; terahertz waves; beam scanning; electronically tunable LC; frequency 335 GHz to 354 GHz; ground plane; liquid crystal based reflectarray antenna; low frequency bias signal; parallel unequal length dipoles; permittivity value; single layer multiresonant periodic array; unit cells; Antenna radiation patterns; Bandwidth; Computer architecture; Gain; Liquid crystals; Permittivity;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4673-5315-1
DOI :
10.1109/APS.2013.6711797
