DESING AND ANALYSIS OF PATTERN RECONFIGURABLE GRAPHENE ANTENNA

Abstract

This dissertation represents design and analysis of graphene based antenna for Tera Hertz frequency application. Proposed antennas have a specific property of reconfiguration in radiation pattern. At THz frequency, graphene is most suitable material having excellent electrical, optical and thermal properties. Reconfiguration at THz frequency is achieved by varying dynamic surface conductivity of graphene material, which can be varied by changing the chemical potentials. Three pattern reconfigurable antennas, having different structure and radiation pattern are designed and simulated in report. First design is a 2-beam reconfigurable Yagi-Uda antenna array, which resonate at 1.8 THz with maximum directivity of 4.42dBi. Proposed antenna works on the concept of conventional Yagi-Uda antenna array. It consists of a driven dipole radiator, parasitic elements and designed using graphene 2D material on SiO2 substrate. The main beam can be directed in two opposite direction by varying the chemical potential of the parasitic element length. Variation in length makes the parasitic element either director or reflector. Second antenna design is a 4-beam reconfigurable Yagi-Uda antenna, which includes modification in first structure. It can direct the main beam in four different directions, which radiate at 1.74 THz with maximum directivity of 3.55dBi. It includes four parasitic elements in all four side of radiating elements. Third structure includes design of graphene cubic antenna having resonant frequency of 1.67THz. Antenna provides a very high Directivity of 8.34dBi with a side lobe level of - 16.8. Cubic structure designed using polyamide substrate. Top faces contains bow –tie type dipole and all other faces covered using graphene. Variation in chemical potential of graphene covered faces makes them as a ground plane. Such faces can reconfigure the radiation pattern and at last analysis of high gain cubic antenna for 5.005 GHz band is also included in report