Single-chip duplexer with isolation shield between transmit and receive filters
US8680944B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Jan 20, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/706
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A single-chip duplexer, interfacing a receiver and a transmitter with a common antenna, includes transmit and receive filters, an annular sealing ring and a conductive stripe. The transmit filter is connected between the antenna and the transmitter, and has a transmit passband. The receive filter is connected between the antenna and the receiver, and has a receive passband different from the transmit passband. The annular sealing ring is connected between a surface of the chip and a surface of a cap to form a sealed cavity between the chip and the cap. The conductive stripe extends across at least a portion of the surface of the chip between the transmit filter and the receive filter, the conductive stripe being directly connected to the sealing ring and electrically connected to ground. The conductive stripe provides at least one of magnetic shielding and capacitive shielding between the transmit filter and the receive filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.