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An Edge-Coupled Magnetostatic Bandpass Filter

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arxiv 2312.10583 v1 pith:4FJT6ROG submitted 2023-12-17 physics.app-ph

An Edge-Coupled Magnetostatic Bandpass Filter

classification physics.app-ph
keywords filterbandpassedge-coupledfieldgarnetmagneticmagnetostatictunable
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This paper reports on the design, fabrication, and characterization of an edge-coupled magnetostatic forward volume wave bandpass filter. Using micromachining techniques, the filter is fabricated from a yttrium iron garnet (YIG) film grown on a gadolinium gallium garnet (GGG) substrate with inductive transducers. By adjusting an out-of-plane magnetic field, we demonstrate linear center frequency tuning for a $4^{\text{th}}$-order filter from 4.5 GHz to 10.1 GHz while retaining a fractional bandwidth of 0.3%, an insertion loss of 6.94 dB, and a -35dB rejection. We characterize the filter nonlinearity in the passband and stopband with IIP3 measurements of -4.85 dBm and 25.84 dBm, respectively. When integrated with a tunable magnetic field, this device is an octave tunable narrowband channel-select filter.

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