Improvement the reflection coefficient of Waveguide-Fed Phased-Array Antenna utilizing Liquid Crystal

Abstract— This work investigates the improvement of the active reflection coefficient of waveguide-fed phased-array antenna using liquid crystal layers. The anisotropy properties of liquid crystal layer can be employed to eliminate blind scan angle and improve the wide angle impedance matching of the waveguide-fed phased array antennas. The authors have expressed the modal analysis of the waveguide-fed phased-array antenna, which is covered with uniaxial anisotropic liquid crystal layers. The analytical method can be used to optimize the wide angle impedance matching over broad angular range of the array. The analytical method is assumed for infinite arrays. The analytical results have been verified using simulation software. In this paper it is proposed to use anisotropic liquid crystal to improve the reflection coefficient of waveguide-fed phased-array antennas. Also it is proposed to employ the reconfigurable properties of liquid crystal to engineering the analytical optimization.