27-04-2011 дата публикации
Номер: CN0102034064A
Принадлежит:
The invention relates to a method and a device for controlling the communication distance of a radio frequency subscriber identity module (SIM) card by capacitive induction. The device comprises a mobile phone, the radio frequency SIM card with a radio frequency chip, and a card reader, wherein the card reader is provided with a capacitive induction sensor; the capacitive induction sensor makes the card reader form an electric field through a metal wire, the SIM card enters the electric field of the card reader, the electric field changes, the capacitive induction sensor detects the change of a capacitance value and sends trigger level to a micro control unit (MCU) of the card reader, so that the MCU controls the radio frequency chip to enter a receiving or sending state from a sleep state through the changed level; and the mobile phone enters the electric field of the card reader, so that the SIM card and the card reader can transmit data in a range of 10cm. The radio frequency SIM card ...
Подробнее