Title :
Performance of reflectarray cells printed on liquid crystal film
Author :
Ismail, M.Y. ; Hu, W. ; Cahill, R. ; Gamble, H.S. ; Dickie, R. ; Fusco, V.F. ; Linton, D. ; Rea, S.P. ; Grant, N.
Author_Institution :
Queen´´s Univ. Belfast, Belfast
Abstract :
In this paper we demonstrate that the anisotropic property of liquid crystal can be exploited to control the phase of signals that are reflected from a reflectarray cell. Numerical and measured results at X-band are used to compare the plane wave scattering from two reflectarray cells which are constructed on liquid crystal film of thickness 200 mum and 500 mum. The phase agility, bandwidth and reflection loss are shown to be dependent on both the thickness and the voltage controlled permittivity of the tunable substrate. A tunable phase range greater than 250deg is achieved over a 6.1% bandwidth.
Keywords :
antenna phased arrays; electromagnetic wave scattering; liquid crystals; liquid crystal film; phased array antennas; plane wave scattering; reflectarray cells; signals phase; size 200 mum; size 500 mum; Anisotropic magnetoresistance; Bandwidth; Liquid crystals; Optical films; Permittivity measurement; Reflection; Scattering; Thickness control; Thickness measurement; Voltage control; liquid crystals; non linear dielectrics; phased array antennas; reflectarrays;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429811