Patent ID: 8792935

Claim:
A mobile communication terminal used in a mobile communication system providing mobile communicating service in a first frequency band, comprising: a first signal processing circuit, having a first impedance, configured to process signals for the mobile communication service; a second signal processing circuit, having a second impedance different from the first impedance, configured to process signals for radio tag communicating in a second frequency band; an antenna configured to be commonly used by the first and second signal processing circuits, wherein the signals for the mobile communication service and the signals for the radio are mutually independent; and a frequency discriminator coupled between the first and second signal processing circuits and coupled to the antenna and configured to discriminate the signals for the mobile communication and the signals for the radio tag, the frequency discriminator having a transmitting and receiving port for the mobile communication and a port for the radio tag, so that the first signal processing circuit and the second signal processing circuit are separable by frequencies in order to reduce interference therebetween; wherein an impedance of the antenna is matched to the first impedance of the first signal processing circuit in the first frequency band and matched to the second impedance of the second signal processing circuit in the second frequency band by adjusting at least one of a material, a shape and a size of the antenna.