Adapter for integrated circuit cards for cellular telephones

An adapter for the use of microprocessor based subscriber identification cards having the "plug-in" format (1) for cellular telephone apparatus in cellular telephone apparatus arranged to operate with microprocessor subscriber identification cards having the "credit card" format, in which a first area (4) for the insertion of the plug-in format subscriber identification card (1) and a second area (5) for the connection of the adapter (3) with the cellular telephone apparatus, the first and second areas (4, 5) being spatially separated each other and electrically connected, so that the signals coming from the first insertion area (4) are brought to the second connection area (5), and in which the first area (4) for the insertion of plug-in format subscriber identification card, the second area (5) for the connection of the adapter with the cellular telephone apparatus and the electrical connection (12) between the same, are realized by means of a printed circuit (8), characterized in that it comprises:

• an upper layer (6) having a rectangular shape and having an opening (13) corresponding to the second area (5) for the connection of the adapter with the cellular telephone apparatus;
• an intermediate layer constituted of the printed circuit (8);
• and
• a lower layer (10) having a rectangular shape, wherein internally to the respective upper and lower layers (6, 10) there are realized third and fourth cavity areas (7, 11) corresponding to the first area (4) for the insertion of the microprocessor subscriber identification card having a plug-in card 1 format.