Planar Gyrotropic Devices Analyzed by using a Variational Principle

This paper presents results obtained with a new explicit variational principle developed by the authors for planar multilayered gyrotropic structures. It is applied here to planar YIG films coupled to planar lines, used as resonators in Yig Tuned Oscillators. Under- and overcoupled topologies are modelled. The calculation of YIG Magnetostatic Wave resonators as equivalent resonant transmission lines agree very well with measurements carried out up to 20 GHz.