Automatic antenna tuning unit for software-defined and cognitive radio
US8095085B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Aug 22, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A closed-loop controlled antenna tuning unit (ATU) system includes a return loss detector connected to sample an RF signal generated by a signal source to provide a return loss signal. A matching state searching circuit is connected to receive the return loss signal and, in response, selectively store a return loss value and an impedance matching state. A central controller is connected to provide a switch control signal and apply an optimum matching state to the impedance synthesizer at the conclusion of the matching state search. An impedance synthesizer is responsive to the switch control signal for coupling a radio frequency signal and matching the impedance of an antenna to a signal source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.