Proximity sensor using antennas of a user device
US8798695B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2012 |
| Grant date | Aug 5, 2014 |
| Priority date | — |
| Expiry date | Sep 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and systems of detecting objects in proximity to user devices and distinguishing between object types are described. One method includes measuring a magnitude of mutual coupling between two antennas of the user device using a transmitted signal by a first antenna and a received signal by a second antenna. The method distinguishes between the user device being proximate to free space, a first object type or a second object type using the magnitude of mutual coupling or magnitude of received signal strength. The first object type includes non-water-based objects that do not absorb electromagnetic radiation and the second object type includes objects that absorb electromagnetic radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.