Tag antenna, tag and RFID system using the same
US7324058B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2006 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Mar 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/285
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication distance difference due to an attached object can be canceled, and an RFID system can be provided which has approximately the same communication distance regardless of an attached position (surface) of a tag. A tag antenna used for such the RFID system is for transmitting/receiving a radio signal to/from an RFID reader/writer in an RFID system has a pair of antenna elements centered on a feeding point and when a carrier wavelength of the radio signal is λ, each of the pair of the antenna elements includes a dipole portion which has a length from the feeding point of approximate λ/4 and a plurality of bending portions as well as a circular polarized wave generation portion linked to an end of the dipole portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.