Reconfigurable Radiation Pattern of Yagi-Uda Array Based on Graphene Patch Sectors

This research presents a reconfigurable Multi-Beam Directional of Yagi-Uda array for terahertz communications. The structure consists of planar dipole antenna surrounded by rows of metallic patches with graphene sector rings printed on silicon oxide substrate. Controlling the chemical potential of the graphene sectors switch, a single beam in two, four or eight directions. OFF-state
$(\mu_{c1}=0eV)$
acts as director and ON-state
$(\mu_{c2}=2eV)$
acts as reflector. A parametric study on the influence of adjusting the distance between the driven dipole and the patch sectors and the radius of the copper patches is studied. Adjusting of number of graphene sector rings on the the resonance frequency and peak gain has been investigated. It produces good impedance matching at 2.29 THz with peak gain of 8.19 dBi.