Antenna for contact-free transmission/reception reading system

A reader and antenna technology, which is applied to antennas, transmission systems, loop antennas, etc., can solve the problems of chaotic man-machine control of antennas, unprocessed readers, and ineffective operations.
CN1425210AInactive Publication Date: 2003-06-18ASK CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ASK CORP
Publication Date
2003-06-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention concerns a reader antenna in a system of identification or of access to a zone with controlled access comprising a reader designed to detect responding electromagnetic signals coming from a contact-free portable object such as an ISO card or a disposable ticket (46), the responding magnetic signals being transmitted by an antenna (48) located in the portable object in reply to the reception of electromagnetic signals transmitted by the reader antenna when the bearer of the portable object presents the portable object in front of the reader. The antenna comprises n groups of turns (20, 22, 24) arranged in series wherein each group of k-1 turns includes a number of Nk-1 turns less than the number of Nk turns of the group of k turns (k ranging between 2 and n) and is spaced apart from the group of k turns by a distance Dk-1 greater than a predetermined value, the turns of all the groups being wound in the same direction.
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Description

technical field

[0001] The present invention relates to transceiver systems using a reader designed to detect, in response to an electromagnetic signal emitted by an antenna located within the reader, a signal presented by its holder in front of the reader. Electromagnetic signals emitted by portable non-contact objects, and in particular the invention relates to a reader antenna for a non-contact transceiver system. Background technique

[0002] Carriers used to identify their holder or to enter controlled access areas, such as public transport networks (such as the RATP metro network or the SNCF metro network in France), are increasingly associated with standard contact bodies (cards or tickets) A different so-called "touchless" technology is featured.

[0003] The exchange of information between the non-contact body and the reader is usually achieved by remote electromagnetic coupling between a first antenna housed in the non-contact body and a second antenna located in ...

Claims

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