Transponder unit and transport unit and card

Details Transponder unit and transport unit and card Transponder unit and transport unit and card

2005-02-01

2005-02-01

Lee, Michael G. (Department: 2876)

Registers

Records

Conductive

C235S441000, C235S444000, C235S451000, C235S493000

Reexamination Certificate

active

06848621

ABSTRACT:
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 RAand a capacitor parallel thereto and having a capacitance CA. A closed coupling circuit of secondary winding is coupled with the aerial winding by a mutual inductance MSAand 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 MSAis adjusted to comply with the relationship MSA=√{square root over ( )}[RA/ω) (LP+LS+2MPS)], where ω2=1/(LACA) is true for the receiving frequency ω of the transponder and Lpand LSare the inductances of the primary winding and of the secondary winding and MPSis their mutual inductance.

REFERENCES:
patent: 4583099 (1986-04-01), Reilly et al.
patent: 5049856 (1991-09-01), Crossfield
patent: 5257009 (1993-10-01), Narlow
patent: 5581248 (1996-12-01), Spillman et al.
patent: 5608417 (1997-03-01), de Vall
patent: 5751256 (1998-05-01), McDonough et al.
patent: 6072383 (2000-06-01), Gallagher et al.
patent: 6421013 (2002-07-01), Chung
patent: 196 28 802 (1998-01-01), None
patent: 0 249 356 (1987-12-01), None
patent: 0 762 535 (1997-03-01), None
patent: 1 031 939 (2000-08-01), None
patent: 2 288 103 (1995-10-01), None

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