Design of a quadrature hybrid waveguide coupler at high frequency for high power applications

In recent times, research in the field of nuclear fusion systems has been on the rise. Such systems play a vital role in the study of plasma physics and for possible applications towards the generation of electricity. Designing the components for such systems is a challenge owing to the demand for operation in high-frequency region (in the range of GHz) at extremely high powers. This paper presents a structure and methodology for designing a quadrature (90°) hybrid coupler operating at 3.7 GHz and 5 GHz frequencies. Designs have been simulated in COMSOL Multi physics software and RF heating results along with scattering parameters are presented in this paper.