Antenna for reader/writer and reader/writer having the antenna
US7495625B2 · kind B2 · utility
35Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Jan 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A soft magnetic member which is formed by a composite of an organic object to satisfy a predetermined relationship with an antenna area, a circumference length, and a magnetic transmission ratio and a conductive member are provided between an antenna coil which is formed by at least one loop and a metal surface of the conductive member such as a metal casing. The magnetic flux which invades into the conductive object is blocked by the soft magnetic member and the conductive member so as to restrict the influence thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.