Simulation and Performance Analysis of a Plasma Switch for Microwave Control and Amplification in a T-Shaped Circular Waveguide in the S-Band

In this work, the control and amplification of microwaves in a T-shaped circular waveguide in the S-band using a plasma switch are simulated by Computer Simulation Technology (CST) software and the Finite-Difference Time-Domain (FDTD) method. We determine the ratio of RF frequency to argon plasma frequency in the collisional regime and investigate the interaction, resonance, and complete reflection of electromagnetic waves. The variations in wave amplitude at three ports (input, side, and output arms) after interaction with the plasma switch at different plasma densities are analyzed and compared. Additionally, we discuss the temporal evolution of the electric field within the waveguide at the moment of complete reflection. Our results indicate that, by selecting appropriate physical parameters, a T-shaped circular waveguide with a plasma switch can be effectively utilized for controlling and reflecting high-power waves at high repetition rates, as well as for amplification purposes.