Microwave oscillator tuned with a ferromagnetic thin film
US7528663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2004 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jan 12, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1888
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A microwave tuned oscillator utilizing a ferromagnetic thin film resonator comprises: a) a microwave resonator (1) comprising a ferromagnetic thin film resonance plate (110) such as a disc-shaped YIG crystal placed on a microwave integrated circuit (11), such as a half-wavelength strip-line resonator, b) bias magnetic field means (12) for applying a bias magnetic field perpendicular to the ferromagnetic thin film resonance plate (110), c) an active element for oscillation (21), a reactive feedback element (24) and a load (23, 25) controlled by the microwave properties of the ferromagnetic thin film resonance plate (110) through a load feedback loop (4), and d) an overall positive feedback loop (3, 14, 15) connected between the active element for oscillation (21) and the microwave resonator (1) to cause a sustained oscillation to build up at one of parametrically excited resonances of the ferromagnetic thin film resonance plate (110).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.