| 摘要 |
In order that an electronic communications system ( 100 ) equipped with: at least one base station ( 10 ) with at least one antenna unit ( 16 ), in particular taking the form of a coil, which base station ( 10 ) is disposed, in particular, on an object to be secured against unauthorized use and/or against unauthorized access, for example on a means of locomotion or on an access system, and at least one transponder station ( 40 ) with at least one antenna unit ( 44 ), in particular taking the form of a coil, which transponder station ( 40 )-can, in particular, be carried by an authorized user and/or-is designed to exchange data signals ( 22, 24 ) with the base station ( 10 ) in the active state, wherein, by means of the data signals ( 22, 24 )-the utilization and/or access entitlement can be determined and/or-the base station ( 10 ) can be controlled accordingly, can be further developed in such a way that a "relay attack" is at least significantly impeded, and, if possible, completely averted and prevented, it is proposed that the transponder station ( 40 ), in particular the antenna unit ( 44 ) of the transponder station ( 40 ), is screened, in the passive state, from electrical fields and/or from magnetic fields and/or from electromagnetic fields, by means of at least one screening unit ( 50 ).
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