Resistively Loaded Cavity-Backed Spiral Antenna for Optimal Antenna-Plasma Coupling in Tokamaks

A resonant helical enclosure-backed spiral antenna, functioning on a frequency of 433 MHz, is presented in the steady state superconducting tokamak (SST-1) framework. The Proposed antenna provides notable improvements in impedance matching. Also, it exhibits in uni-direction across the spectrum, exhibiting broadside gain between 2 and 7.7 dBi, and achieving a minimum reflection coefficient of -41.16 at 433 MHz. The findings contribute to an enhanced comprehension of the interaction between the antenna and plasma. This study sets the stage for upcoming experimental inquiries, validating the efficacy of the spiral antenna configuration and promoting progress in fusion research.