MSSW resonators with straight edge reflectors

The performance of a novel magnetostatic surface wave (MSSW) resonator structure is presented. The resonator uses rectangular YIG film to propagate MSSWs where the straight edges serve as reflectors. The resonator was tunable from 3 to 9 GHz by varying the DC bias field from 500 to 2500 Oe and exhibited very high Q ranging from 900 to 4000. Through a careful parameter choice, the spurious modes were suppressed by more than 15 dB from the main resonance. Problems arising from coupling to width modes and their effect on the main resonance are discussed.