Proximity-coupled high gain graphene patch antenna using holey dielectric superstrate for terahertz applications

Abstract

This paper presents the concept of a superstrate microstrip graphene antenna feed with a proximity-coupled technique. The proposed structure is based on a resonance cavity antenna (RCA) method, which significantly improves the gain and radiation efficiency. The investigated electric properties of graphene confirm the exceptional role of material for realizing an antenna in the THz band. Firstly, a triangular shape graphene antenna configured at 1.5 THz frequency, which illustrates reconfigurable properties by changing the chemical potential via bias voltage and antenna radiation performance in the frequency band from 1-to-2 THz. Furthermore, holey superstrate layers are placed over the graphene antenna at an appropriate distance to improve the radiation characteristics. Based on the findings, a superstrate graphene antenna advances the gain, radiation efficiency, and impedance bandwidth significantly compared to the conventional design. The projected high gain graphene antenna can be used for sensing, imaging, and detection applications via spectroscopic and Doppler radar techniques. The numerical simulation and analysis of the antenna are performed by CST microwave studio (CST MWS).