| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor device having an RFID and enabling personal information to be sent and received without requiring the operation of confirming the residual power of a battery for driving a power supply or replacing the battery due to aged deterioration of the battery, while maintaining the sending and receiving of personal information in a good condition even if the electric power of an external electric wave or electromagnetic wave (carrier wave) is not sufficient for the power supply for drive. <P>SOLUTION: A battery is provided as a power supply for supplying electric power to the RFID. To supply electric power to the battery, a second antenna circuit for receiving signals for charging the battery is provided separately of a first antenna circuit for sending and receiving signals of personal information to and from the outside. Either the first or second antenna circuit receives signals via a booster antenna. <P>COPYRIGHT: (C)2008,JPO&INPIT |
