Coupling of RF current to magnetostatic forward volume wave modes in straight edge resonators

The coupling of RF current in a strip transducer to magnetostatic forward volume wave modes in a one-port straight edge resonator is discussed in terms of input impedance. As results, the coupling strength is proportional to the operating frequency and some material parameters, such as saturation magnetization (Ms), YIG film thickness and the inversion of linewidth (/ΔH). Further analyses demonstrate that changing the resonator dimensions along transducer linearly changes the coupling, but changing the length along the direction vertical to the transducer leads to an optimum coupling region. The comparison of the predictions with experiment results confirms the validity of the theory