Design of a 3.7 GHz TE10 – TE30 mode converter using stepped impedance transformer for CW applications

Yogesh M. Jain, Shrey Thakker, P. K. Sharma and Harish V. Dixit

Journal of Electromagnetic Waves and Applications, 2021, vol. 35, issue 13, 1699-1707

Abstract: This paper presents the design and simulation of a novel TE10 to TE30 mode converter operating at 3.7 GHz and is subjected to high RF power of 500 kW in Continuous Wave (CW) regime. The design incorporates a stepped impedance transformer as opposed to the conventional capacitive button to improve the return loss and power handling capacity of the converter. A rigorous RF, breakdown and multiphysics analysis including thermal, fluid dynamics and stress physics is performed on the mode converter to ascertain its viability and usefulness as a power dividing network in the Passive Active Multijunction launcher for Lower Hybrid Current Drive systems of tokamaks. The proposed mode converter exhibits a return loss of ∼50 dB, mode conversion efficiency of ∼97% and a peak E-field of 685 kV/m is obtained as compared to that of 4.2 MV/m obtained in the conventional mode converter. Thus, the power handling capacity of the proposed mode converter design is found to be 97.3% higher than the conventional mode converter.

Date: 2021
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DOI: 10.1080/09205071.2021.1915187

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