Modelagem por MOM de um dipolo de grafeno com múltiplos potenciais químicos

Abstract

In this dissertation, the potential of graphene in the terahertz frequency range was explored, particularly its ability to control the radiation pattern and impedance of a graphene dipole antenna by varying the chemical potential in multiple controllable segments. Two dipole antennas were analyzed, one with four graphene segments and another with six graphene segments, where each segment can have its chemical potential controlled directly. The study used the Method of Moments with graphene surface impedance values to calculate input impedance, gain, surface current distribution, and radiation pattern. The variations in chemical potentials were divided into symmetric and asymmetric groups, allowing adjustments to the second resonance and the angle of maximum gain in the radiation pattern, respectively. Compared to four-segment antennas, the six-segment antenna exhibited increased gain in the symmetric group with little variation in the second resonance. Furthermore, the gain of the six-segment antennas showed a notable increase at the point of maximum deviation while maintaining nearly constant angular displacement. This study paves the way for highly adjustable and efficient graphene antennas with promising applications in communication technology and radiation. Future work may explore various chemical potentials, other antenna geometries, and optimization techniques in simulation.