Title:
デュアルアンテナコイルトランスポンダシステム
Document Type and Number:
Japanese Patent JP3914537
Kind Code:
B2
Abstract:
The present invention relates to a dual antenna coil identification system, and more particularly, to an interrogator or reader for inductively coupling to a transponder and thereby extract data from the transponder. The magnetic field required to energize a transponder is generated by currents flowing through two essentially identical but opposite phased antenna coils arranged near the area where tags are to be read.
Inventors:
Ward William H
Ward Timothy John
Ward Timothy John
Application Number:
JP2003542507A
Publication Date:
May 16, 2007
Filing Date:
November 01, 2002
Export Citation:
Assignee:
Avid Identification System Incorporated
International Classes:
G06K17/00; H04B1/59; G06K7/08; H01Q1/22; H01Q7/00; H04B5/02
Domestic Patent References:
| JP60206332A | ||||
| JP200257608A | ||||
| JP10242893A |
Foreign References:
| US4361153 |
Attorney, Agent or Firm:
Akihiro Ryuka