Bulk acoustic wave resonator with two piezoelectric layers as balun in filters and duplexers
US6670866B2 · kind B2 · utility
177Cited by
9References
48Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Jan 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bulk acoustic wave device having two resonators in a stacked-up configuration separated by a dielectric layer. The device can be coupled to a lattice filter or a ladder filter to form a passband filter with an unbalanced input port and two balanced output ports. One or more such passband filters can be used, together with another lattice or ladder filter, to form a duplexer having an unbalanced antenna port, two balanced ports for one transceiver part and two balanced ports for another transceiver part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.