Research of coupling coefficient extraction of a cavity resonator

The electromagnetic coupling coefficient is an important parameter in circuit modeling and simulation because it characterizes the transducer and useful for deducing equivalent circuits. In this paper, we proposed a numeric coupling coefficient extraction method based on perturbation theory and commercially available CST software of solving the coupling coefficient of the rectangular waveguide resonator, which is coupling with a coaxial cable. Simulation results indicate that this method is consistent with the theoretical method, and it is commonly used for rectangular or cylindrical cavities. Thus, the proposed method could offer an effective way of solving coupling coefficients extraction problem for cavity resonators.