Graphene AMC Array As A Ground Plane for Beam-Switching at Terahertz Band

This paper introduces a graphene-based artificial magnetic conductor (AMC) surface backed dipole antenna for electronic beam-switching at terahertz (THz) applications. A graphene-based AMC array which consists of 17×17 unit-cell elements is used as a ground plane for dipole antenna. Each unit-cell element is consisting of SiO
2
substrate sandwiched between graphene patches on the top and the bottom faces. The graphene patch at the bottom is surrounded by a graphene rectangular ring to control the back radiation from the dipole. All graphene-based components are firstly biased with DC voltage (µ
c
= 2 eV) and unbiased (µ
c
= 0) according to the required beam direction. The gain of the dipole is enhanced to 4.11 dBi. The radiation pattern of the dipole is switched vertically in different directions by changing the bias voltage of the graphene AMC unit-cells at the substrate bottom surface.