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Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

Planar resonator and integrated oscillator using magnetostatic waves.

Y Kinoshita¹, S Kubota, S Takeda

¹Hitachi Ltd., Tokyo.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1990

Summary

Researchers developed a tunable magnetostatic wave (MSW) resonator on YIG/GGG substrates. This device enables a compact, high-performance microwave oscillator with spectral purity comparable to YIG sphere technology.

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Area of Science:

* Condensed matter physics
* Microwave engineering
* Materials science

Background:

* Magnetostatic waves (MSWs) offer unique properties for microwave devices.
* Yttrium-iron-garnet (YIG) films on Gadolinium-Gallium-Garnet (GGG) substrates are suitable for MSW applications.
* Development of compact and tunable microwave oscillators remains a key challenge.

Purpose of the Study:

* To design and fabricate a planar magnetostatic wave resonator.
* To characterize the resonator's performance, including filter response and Q-factor.
* To demonstrate a tunable microwave oscillator utilizing the developed resonator.

Main Methods:

* Fabrication of a planar MSW resonator on a YIG/GGG substrate using aluminum finger electrodes.
* Integration of the resonator with a silicon bipolar transistor on a ceramic substrate.
* Characterization of the resonator's notch filter response and the oscillator's frequency tunability and spectral purity.

Main Results:

* A tunable MSW resonator chip (2 mmx5 mm) was successfully realized.
* The resonator exhibited a deep notch filter response (20-35 dB) and a high loaded Q (up to 2000).
* A tunable microwave oscillator (8 cm³) operating at 3 GHz with high spectral purity was demonstrated.

Conclusions:

* The planar MSW resonator shows promise for compact microwave oscillator applications.
* Achieved performance metrics are comparable to established YIG sphere technology.
* Further improvements are needed for practical oscillator implementation.