title: Planar resonator and integrated oscillator using magnetostatic waves.
abstract: A simple planar resonator using a magnetostatic wave (MSW) excited by aluminum finger electrodes with two bonding pads was realized on YIG/GGG (yttrium-iron-garnet film on a gadolinium-gallium-garnet crystal) substrate with two reflection edges. The tunable MSW resonator chip (2 mmx5 mm) exhibited a sharp notch filter response, as deep as 20-35 dB, and a high loaded Q up to 2000, which was tunable over the microwave frequency range from 2 to 4 GHz. A small tunable oscillator (8 cm(3)) was experimentally demonstrated using the MSW planar resonator and a silicon bipolar transistor integrated on a ceramic microwave circuit substrate. Microwave oscillation with spectral purity, at the same level as that of YIG sphere technology, was observed at 3 GHz. The experimental results indicate the technical areas where improvement must be made to realize a practical oscillator configuration.
authors.affiliation: Hitachi Ltd., Tokyo.
authors.forename: Y
authors.initials: Y
authors.lastname: Kinoshita
authors.forename: S
authors.initials: S
authors.lastname: Kubota
authors.forename: S
authors.initials: S
authors.lastname: Takeda
authors.forename: A
authors.initials: A
authors.lastname: Nakagoshi