Rotating-polarization reflector-backed RFID loop antenna apparatus and method
US8659494B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2011 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Aug 27, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/245
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present disclosure provides a rotating-polarization reflector-backed Radio Frequency Identification (RFID) loop antenna apparatus and method. The loop antenna apparatus and method provides high gain (i.e., maximizing read distances at lowest power), directionality (i.e., ability to focus on specific areas), orientation insensitivity (i.e., ability to read RFID tags in any direction or orientation) while occupying minimal volume in overhead configurations. In an exemplary embodiment, the loop antenna apparatus includes a reflector and a loop element with the reflector configured to reflect downward RF energy from the loop element. Antenna polarization is controlled by a feed location on the loop element and antenna pattern is controlled by the reflector. Thus, orientation insensitivity may be achieved without changing the antenna pattern by rotating the feed location and not the reflector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.