Simulation and performance analysis of plasma switch for microwave amplification in 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 using Computer Simulation Technology (CST) software and the Finite-Difference Time-Domain (FDTD) method. We present an innovative configuration that integrates a plasma switch into a T-shaped circular waveguide, enabling real-time control of plasma parameters to enhance microwave reflection and amplification. 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. By optimizing physical parameters, the proposed configuration demonstrates effective control, reflection, and amplification of high-power waves at high repetition rates.