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Electronic communications system

  • US 20070142088A1
  • Filed: 04/20/2004
  • Published: 06/21/2007
  • Est. Priority Date: 04/29/2003
  • Status: Active Grant
First Claim
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1. An electronic communications system (100), equipped with [a.1] at least one base station (10), to which [a.2] at least one LC resonant circuit (13, 16) [a.2.1] with at least one antenna unit (16) in the form of a coil, and [a.2.2] at least one capacitive unit (13) series-connected to the antenna unit (16) is assigned, which base station (10) is arranged, in particular, on an object to be secured against unauthorized use and/or against unauthorized access, such as on a means of locomotion, on an access system or on an entry system, and [b.1] at least one transponder station (40), to which [b.2] at least one antenna unit (44) in the form of a coil is assigned, which transponder station (40) can be carried by, in particular, an authorized user and/or is designed for the exchanging of data signals (22, 24) with the base station (10), wherein the utilization and/or access entitlement is determined and/or the base station (10) can be controlled accordingly by means of these data signals (22, 24), characterized in that [c.1] connected in parallel with the antenna unit (16) and/or in parallel with the capacitive unit (13) is at least one tuning circuit (17,18), equipped with [c.1.1] at least one first element (17) in the form of at least one capacitive unit or in the form of at least one inductive unit, and [c.1.2] at least one regulating resistor (18), series-connected to the first element (17), the variable resistance value of which regulating resistor can be controlled in order to set and/or to calibrate the resonant frequency of the LC resonant circuit (13, 16).

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