Switching circuit for radio frequency isolation in a portable transceiver
US9991885B2 · kind B2 · utility
7Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 2017 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | May 3, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/44
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Semiconductor switches in portable transceivers switch between outgoing and incoming radio frequency signal paths. The isolation can be limited by the capacitive coupling between the switch input and the switch output. Ultra-high isolation can be achieved by adding a coupled transmission line to the semiconductor switch. The coupled transmission line introduces inductive coupling, which cancels at least a part of the capacitive coupling between the switch input and the switch output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.