Surface-acoustic-wave filter having an improved suppression outside a pass-band
US6388545B1 · kind B1 · utility
30Cited by
7References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6489
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A SAW-filter device includes a piezoelectric substrate carrying thereon a first interdigital electrode pair connected to an input terminal and a second interdigital electrode pair connected to an output terminal. The first interdigital electrode pair is grounded to a first ground pad, while the second interdigital electrode pair is grounded to a second ground pad different from the first ground pad. The piezoelectric substrate is accommodated into a space formed in a package body, wherein the space is covered by a metal cap member connected to one of the first and second ground pads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.