Antenna device
US5663738A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1996 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | May 2, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The antenna device has an antenna wire loop which, accompanied by the formation of two electrically outer (1,3) and one electrically central partial loop (2), is twice twisted by in each case 180.degree.. One of the two electrically outer partial loops (3) is geometrically positioned between the electrically central partial loop (2) and the other electrically outer partial loop (1). An impedance element (11) is connected between two connecting points (9,10) located at the entrance and exit of the geometrically central partial loop. The antenna device according to the invention has a very balanced characteristic and in the case of an appropriate choice of its parameters, behaves at the resonant frequency of the tags to be detected in the same way as an antenna with approximately 2 to 21/2 partial loops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.