Surface wave converter with optimized reflection
US6777855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Aug 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14505
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transducer includes base cells each having a length &lgr;, where &lgr; is a wavelength of a center frequency of the transducer. The base cells are arranged in a direction of propagation of a surface acoustic wave. The base cells include exciting base cells and reflecting base cells. The exciting base cells each have a same number of electrode fingers. Each base cell has a reflection portion. The reflection portion of each base cell has a same value mRo, where m is one of −2, −1, 0, 1, or 2 and Ro is a reference reflection. Each non-zero reflection portion in each base cell has a same phase position. Excitation and reflection in the transducer are equal in phase in one direction of propagation of the surface acoustic wave and opposite in phase in an opposite direction of propagation of the surface acoustic wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.