Acoustic resonator filter with electrically variable center frequency and bandwidth
US5291159A · kind A · utility
74Cited by
17References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Jul 20, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/542
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An acoustic resonator filter having at least one of electronically variable center frequency and bandwidth has a shunt coupling consisting of an inductor and voltage variable capacitor matrix. A pair of acoustic resonators each having a parallel inductor are connected to each other and to the shunt coupling network. One of a pair of voltage variable capacitor matrixes each having a center frequency command input voltage is connected to each acoustic resonator and an associated inductor. This circuit can be extended to provide more selectivity and attenuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.