Antenna, and radio-controlled timepiece, keyless entry system and RFID system
US7463208B2 · kind B2 · utility
7Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2006 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Aug 23, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna comprising a magnetic main-path member comprising a coil wound around a magnetic core, and a magnetic sub-path member magnetically connected to the magnetic core for constituting a substantially closed magnetic path with the magnetic main-path member, the antenna meeting the relation of (S/N)1>(S/N)0, wherein (S/N)1 is a ratio of a signal voltage S obtained from the coil to a noise voltage N in this antenna, and (S/N)0 is a ratio of a signal voltage S to a noise voltage N in an antenna having the same structure except for having no magnetic sub-path member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.