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.

本文介绍了新型 TE ₁₀至 TE ₃₀的设计和仿真模式转换器在 3.7 GHz 下运行，并在连续波 (CW) 状态下承受 500 kW 的高射频功率。与传统的电容式按钮不同，该设计采用了阶梯式阻抗变压器，以提高转换器的回波损耗和功率处理能力。在模式转换器上执行严格的射频、击穿和多物理场分析，包括热学、流体动力学和应力物理学，以确定其作为用于托卡马克低混合电流驱动系统的无源有源多结发射器中的功率分配网络的可行性和实用性。与传统模式转换器中获得的 4.2 MV/m 相比，所提出的模式转换器表现出~50 dB 的回波损耗、~97% 的模式转换效率和 685 kV/m 的峰值电场。因此，