Dual mode piezoelectric filter with a relay electrode on the casing substrate
US6731187B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Aug 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/58
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A dual mode filter includes a casing substrate on which an input electrode, an output electrode, two ground electrodes, and a relay electrode are provided, first and second filter elements mounted in parallel with each other on the casing substrate, and a cap fixed onto the casing substrate. The first and second filter elements each include a first terminal electrode, a second terminal electrode, a pair of segmented electrodes, a counter electrode, and a third terminal electrode. The first terminal electrode of the first filter element is connected to the input electrode, and the third terminal electrode is connected to one ground electrode. The first terminal electrode of the second filter element is connected to the output electrode, and the third terminal electrode is connected to the other ground electrode. The second terminal electrodes of the first and second filter elements are connected to the relay electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.