Split band duplexer
US7656251B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2007 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | Feb 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/52
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention is a split band duplexer, which increases the separation between a transmit passband and a receive passband by splitting the transmit and receive passbands into sub-bands. Each sub-band has a bandwidth that is less than the bandwidth of the full passband. The increased separation increases isolation margins and insertion loss margins, which allows use of standard filter components, such as surface acoustic wave (SAW) filters, and their accompanying manufacturing tolerances and drift characteristics. In one embodiment of the present invention, the split band duplexer includes a first sub-band duplexer and a second sub-band duplexer. The first sub-band duplexer may provide a full bandwidth transmit passband and a receive passband that is less than full bandwidth. The second sub-band duplexer may provide a full bandwidth receive passband and a transmit passband that is less than full bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.