Abstract:
PURPOSE: An RFID tag having a secondary modulator is provided to allow a sub modulating unit to widen the range of impedance modification. CONSTITUTION: A main modulating unit(1109m) modulates impedance of an IC(11) according to a digital transmitting signal which is transmitted to an RFID(Radio Frequency ID) reader through an antenna. A sub modulating unit(1109s) modulates the range of impedance modification of the IC. The IC modulates an input signal from the antenna and a control unit and includes a modulating unit for supplying the modulated input signal to the control unit.