Band-pass filter with surface acoustic wave devices
US4063202A · kind A · utility
8Cited by
4References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 5, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | May 5, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14597
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
At least one of several transducers on a piezoelectric substrate is externally short-circuited by a series resonance circuit for suppression of triple transit echoes. The resonance circuit is additionally connected to an amplifier via a high input or output impedance. In multi-transducer systems any two transducers are prevented from communicating via echo signals by such resonance circuits. In filter cascades several resonance circuits may be included in the interstage coupling circuit or between the input and output amplifiers on the one hand and the cascade on the other hand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.