Magnetically tuned high overtone bulk acoustic resonator
US4785269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1986 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | May 15, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Electroacoustic resonating apparatus capable of generating resonances of tunable frequencies. The apparatus includes two transducers coupled to a ferrimagnetic substrate at opposite ends thereof. The first transducer converts an input signal into a signal that produces bulk acoustic waves in the ferrimagnetic substrate. The second transducer receives the bulk acoustic waves and converts them into electrical signals, or alternatively a single transducer which performs both input and output functions. Variable magnetizing means located proximate to the ferromagnetic substrate induces a magnetic field throughout the substrate wherein the magnetic field alters the frequencies of the resonance of the acoustic waves. By varying the magnitude of the magnetic field, the frequencies of the resonances may be varied, thereby allowing tuning of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.