WC-281 Circular Waveguide Terminator Essential in Microwave Plasma Interaction Experiments for SYMPLE

This work presents the novel design and development of a WC-281 circular waveguide terminator or termination for microwave plasma interaction experiments. Final waveguide terminator is designed by using the quad wedge of FR4, cone of resistive material, i.e., Kanthal and Teflon discs. Kanthal is a composition of aluminium, chromium, and iron. Wedge shape geometry helps in gradually changing the impedance and thus decreasing the return loss, while resistive material Kanthal attenuates the field before reaching the receiving end. This makes it suitable for use as the finest microwave termination. The final model of terminator decreases the reflection coefficient (S-11) up to -40 dB while reduces the transmission coefficient (S-21) immensely up to -63 dB at 2.85 GHz.