Surface acoustic wave filter and mobile communication system using same
US5521453A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1995 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Jan 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14526
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A composite surface acoustic wave filter includes an interdigitated interdigital surface acoustic wave filter having input and output terminals. Two one-port surface acoustic wave resonators are electrically connected in series to the interdigitated interdigital surface acoustic wave filter respectively at the input and output terminals, the one-port surface acoustic wave resonators having antiresonant frequencies in a stop band that is close to and higher than the passband of the interdigitated interdigital surface acoustic wave filter. Two other one-port surface acoustic wave resonators are electrically connected parallel to the interdigitated interdigital surface acoustic wave filter, the one-port surface acoustic wave resonators having resonant frequencies in a stop band that is close to and lower than the passband of the interdigitated interdigital surface acoustic wave filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.