EAS and RFID systems incorporating field canceling core antennas
US7019651B2 · kind B2 · utility
47Cited by
10References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 2004 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Oct 28, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/29
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An EAS or RFID system including first and second core antenna systems. The first and second antenna systems establish magnetic fields having opposite directions and are positioned so that the fields at least partially cancel outside of an interrogation zone for detecting an EAS or RFID tag. There is also provided an EAS or RFID wherein the magnetic field direction established by a core antenna is varied at certain time intervals to minimize the effects of null zones in the interrogation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.