Patent ID: 8157179

Claim:
A document comprising: a support ( 10 ) having at least a first portion ( 12 ) and a second portion ( 14 ) configured to be moved relative to each other; and a contactless electronic device ( 1 ) mounted in the first portion ( 12 ) of the support ( 10 ) and including an electronic microcircuit ( 3 ) and an antenna ( 2 ) electrically connected to said electronic microcircuit ( 3 ) and configured to be (electro)magnetically coupled to an external reading station ( 5 ), wherein the electronic microcircuit ( 3 ) being configured to exchange information with an external environment, and the second portion ( 14 ) comprises means ( 7 ) for attenuating the (electro)magnetic coupling, including a resonator circuit coupled to said antenna and disposed substantially in line with the antenna upon the first portion ( 12 ) and the second portion ( 14 ) being substantially superposed one on the other, and configured to render inoperative or operative the exchange of information with the external environment as a function of an offset between the first and second portions ( 12 and 14 ), and a resonant frequency of the resonator circuit ( 7 ) is outside a range of operating frequencies of the electronic microcircuit.