Saw filter featuring impedance transformation
US8068001B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | Nov 29, 2011 |
| Priority date | — |
| Expiry date | Dec 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6469
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface acoustic wave (SAW) filter includes at least one first electroacoustic transducer, and at least one second electroacoustic transducer. The at least one first electroacoustic transducer and the at least one second electroacoustic transducer are side-by-side inside an acoustic path having an aperture A0. The at least one first electroacoustic transducer is connected to an electrical output of the SAW filter, and the at least one second electroacoustic transducer is connected to an electrical input of the SAW filter. At least one first electroacoustic transducer comprises a series circuit of a number of partial transducers, wherein each partial transducer has an individual aperture that is reduced in relation to the overall aperture A0, and wherein the individual apertures add up to the overall aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.