volume | PIER Journals

Abstract

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 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. Simulation is carried out by CST microwave studio. The final model of terminator decreases the reflection coefficient (S₁₁) up to -40 dB while reduces the transmission coefficient (S₂₁) immensely up to -63 dB at 2.85 GHz.

1. Anitha, V. P., P. J. Rathod, R. Singh, and D. V. Giri, "Developmental aspects of microwave-plasma interaction experiments: Phase-1," IEEE Transactions on Plasma Science, Vol. 44, No. 10, 2226-2231, 2016.
doi:10.1109/TPS.2016.2552643 Google Scholar

2. Anitha, V. P., A. Das, Y. C. Saxena, A. Shyam, and P. K. Kaw, "Interaction of high power microwave with plasma," IEEE International Vacuum Electronics Conference (IVEC), 481-482, 2011.
doi:10.1109/IVEC.2011.5747085 Google Scholar

3. Yoneyama, T. and S. Nishida, "Nonradiative dielectric waveguide," Infrared and Millimeter Waves, Vol. 11, 61-98, 1984. Google Scholar

4. Teodoridis, V., T. Sphicopoulos, and F. E. Gardiol, "The reflection from an open-ended rectangular waveguide terminated by a layered dielectric medium," IEEE Transactions on Microwave Theory and Techniques, Vol. 33, No. 5, 359-366, 1985.
doi:10.1109/TMTT.1985.1133006 Google Scholar

5. Rebollar, J. M., "Response of waveguides terminated in a tapered metallic wall (short paper)," IEEE Transactions on Microwave Theory and Techniques, Vol. 34, No. 1, 175-178, 1986.
doi:10.1109/TMTT.1986.1133297 Google Scholar

6. Kumar, J., Zeeshan, R. Jaiswal, A. Baranwal, R. Singh, and V. P. Anitha, "Design and development of a circular waveguide terminator for microwave plasma interaction experiments," 32nd National Symposium on Plasma Science & Technology, Institute for Plasma Research, Gandhinagar, Gujarat, India, Nov. 2017. Google Scholar

7. Pozar, D. M., Microwave Engineering, John Wiley & Sons, 2009.

8. Chhotray, S. K., M. Sumathy, K. S. Bhat, and L. Kumar, "Design of a broad band matched termination for an overmoded waveguide," IEEE International Vacuum Electronics Conference (IVEC), 199-200, 2011.
doi:10.1109/IVEC.2011.5746944 Google Scholar

9. Fusco, V. F., "Low reflection coefficient waveguide termination using an imaging method," Twelfth International Conference on Antennas and Propagation, (ICAP 2003), 716-719, Exeter, UK, 2003.
doi:10.1049/cp:20030176 Google Scholar

10. Uhm, M., H. Lee, C. Kwak, S. Yun, and I. Yom, "Compact waveguide load with thin film resistor," PIERS Proceedings, 1402-1405, Prague, Czech Republic, July 6-9, 2015. Google Scholar

11. CST Microwave Studio, CST STUDIO SUITE, 2018 Darmstadt, Germany. Google Scholar

Dr. Jitendra Kumar

Dr. Raj Singh

Dr. V. P. Anitha