Miniaturized Millimeter Wave Resonators with Self-Biased BaM Films

Miniaturized millimeter wave resonators that are based on the ferromagnetic resonance (FMR) of M-type barium hexagonal ferrite (BaFe 12 O 19 , BaM) films are proposed and simulated. The operating frequency can be up to 50 GHz without external biasing magnetic fields by virtue of the internal anisotropy field of BaM films. A novel strip line ridge structure is utilized to couple energy from transmission line to the ferromagnetic resonators. An equivalent circuit is used to optimize the design, and simulation results from full-wave simulator (HFSS) agree with circuit simulation results from ADS.