Assa Abloy Ab

Sokymat S.a.

Philippe Held

Reinhard Jurisch

Peter Peitsch

Martin Miehling

Egon Konopitzky

The invention concerns a security sealing device including a sealing element, an integrated circuit and an antenna connected to the integrated circuit, the integrated circuit and the antenna forming a RFID circuit. The security sealing device is characterized by the fact that said sealing element is conductive and is forming a part of said antenna.

Security sealing device comprising a RFID tag

A transponder unit which can be integrated in a transport unit or a card or the like. The transponder unit includes, in addition to an encapsulated transponder of an integrated circuit, an aerial winding having a resistance Rand a capacitor parallel thereto and having a capacitance C. A closed coupling circuit of secondary winding is coupled with the aerial winding by a mutual inductance Mand a substantially larger primary winding in series with the secondary winding and having fewer turns, for example only one turn. To achieve almost optimum energy transfer between a reading device and the transponder and to increase the permissible reading distance, the mutual inductance Mis adjusted to comply with the relationship M=&#x221a;{square root over ( )}[R/&#x3c9;) (L+L+2M)], where &#x3c9;=1/(LC) is true for the receiving frequency &#x3c9; of the transponder and Land Lare the inductances of the primary winding and of the secondary winding and Mis their mutual inductance.

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Corseaux, Switzerland

Philippe Held