Millimeter wave □ TE 10 to ○ TE 01 mode transducer for electron cyclotron resonance heating applications

Abstract

In this manuscript, a new design approach is proposed for □TE10 (rectangular) to ○TE01 (circular) mode transducer for electron cyclotron resonance heating (ECRH) applications. The design consists of two parts: first part has a rectangular waveguide, which transforms □TE10 to □TE20 mode, and in the second part, conversion of □TE20 into ○TE01 mode takes place. The electric field pattern, mode conversion efficiency or transmission efficiency and the operating principle of the individual parts are discussed, optimized, and analyzed. The novelty of this integrated design lies in the fact that it has merits of sidewall and inline coupling. Simulation study and optimization of the individual sections of the proposed mode converter were carried out using computer simulation technology (CST) microwave studio software (MWS). The simulation result shows that the design gives more than 97% of mode conversion efficiency with −1 dB bandwidth of 14.65% at 42 GHz. Copper material is used for fabrication of the mode transducers and are assembled with precise doweling. The simulated and measured high frequency (HF)-field pattern of the proposed mode transducer is also highlighted in the manuscript.