Immersible UHF antenna with low power auto tuning system
US8868014B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2011 |
| Grant date | Oct 21, 2014 |
| Priority date | — |
| Expiry date | Aug 10, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna is provided having a good matching characteristics when immersed in a fluid such as saline water, oil, or other liquids (“the phantom liquid”). In some embodiments, the antenna provides a tight capacitive coupling with the phantom liquid through the use of a higher permeability cover and absence of a gap between the cover and the antenna body. One embodiment employs a tunably capacitively loaded inverted “F” antenna structure. Additional embodiments of the invention provide an antenna tuning system that saves power by utilizing very low duty cycle periodical refreshing charge at a tuning varactor diode coupled to the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.