Low-profile Dipole Antennas based on Graphene Plasmonics for THz Applications

This article provides a comprehensive analysis of low-profile, frequency-reconfigurable graphene dipole antennas for THz applications. The antenna consists of two graphene patches to form the bow-tie dipole and the wideband artificial magnetic conductor (AMC). Frequency tuning has been introduced by changing the chemical potential of graphene. The AMC has been designed to operate from 2 THz to 3.4 THz with a ±90° reflection phase bandwidth of 50.39%. Using AMC surface, the total profile of the antenna has been achieved up to 0.09𝜆 0 (where 𝜆 0 is free space wavelength) at the 0° operating frequency of 2.5 THz. In another approach, a hybrid surface combination of AMC and PEC has been used instead of AMC surface to enhance the radiation performance by reducing unwanted current distribution. The input impedance of the proposed antennas are almost stable and well-matched to the impedance of the THz source.