Registering of a transponder tag via an alternating electromagnetic field
US9418261B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 2013 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Nov 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10356
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A transmitter circuit generates an electric source signal, and emits a corresponding alternating electromagnetic field. A receiver antenna registers the alternating electromagnetic field and any modifications thereof due the presence of a tag unit within a range of operation. The receiver antenna is arranged relative to the transmitter antenna and a potential tag unit, such that a portion of the emitted alternating electromagnetic field reaches the receiver antenna unmodified irrespective of whether or not a tag unit is present within the range of operation. A receiver circuit connected to the receiver antenna produces an electric detection signal in response to the alternating electromagnetic fields. Based on the electric detection signal, a processing unit discriminates identification data of any tag unit having modified the alternating electromagnetic field by utilizing an aiding signal component originating from the unmodified portion of the alternating electromagnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.