Automatic electronically tuned electrically small transmitting antenna system
US8552911B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jul 11, 2011 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Feb 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an automatic tuning system for a loop antenna having a single electronically variable reactance element, the reactive component sense of the antenna impedance is determined over a wide range of frequency. The electronically variable reactance component of the antenna is automatically minimized by a feedback loop driving a voltage variable capacitance until the reactive component of the antenna impedance is virtually zero and the antenna impedance is hence resistive. The adjustment of the electronically variable capacitance is by a variable high voltage power supply controlled by a feedback amplifier or by a high voltage feedback amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.