Antenna arrangement and transponder reader

US6259413A · kind A · utility

Assignee

• MOBA Mobile Automation AG · DE

Inventors

• Andreas Schmidt · Braunschweig, DE
• Matthias Sub · Dresden, DE

Key dates

• Filing date: Oct 26, 1999
• Grant date: Jul 10, 2001
• Expiry date: Oct 26, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K7/10435
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An antenna arrangement, which is preferably incorporated in a transponder reader, comprises a first subloop, which essentially encloses a first area and which has a first and a second end, a second subloop, which essentially encloses a second area and which has a first and a second end, the two first ends of the first and the second subloop being connected together and the two second ends being connected together in such a way that the two subloops together constitute a single winding, and a single feeding device for applying a voltage between the connected first ends and the connected second ends, the first and the second subloop being so positioned relative to each other that the first and the second area are so arranged facing each other that plane areas approximating to the areas are parallel to each other or intersect one another at an acute angle. Since the inductance can be kept as small as possible for such an antenna arrangement, considerably larger pass-through cross-sections can be realized, or larger circuit capacitances can be employed so as to minimize the influence of stray capacitances. In this way stable antenna operation can be achieved in a reliable and economic …