An Edge-Coupled Magnetostatic Bandpass Filter
arxiv(2023)
摘要
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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