Patent ID: 6963765

Claim:
A card-type wireless communication device connected to an information terminal device, comprising: an antenna; a receiver circuit for performing frequency conversion and demodulation on a high-frequency signal received through the antenna so as to output a base-band reception signal; a transmitter circuit for performing modulation and frequency conversion on a base-band transmission signal fed thereto so as to output a high-frequency signal to the antenna; a base-band signal processing circuit for processing the base-band reception signal and the base-band transmission signal; an interface circuit that functions as an interface between the card-type wireless communication device and the information terminal device; a power supply circuit for supplying power to each of the transmitter circuit, the base-band signal processing circuit, and the interface circuit; a connector for connecting the card-type wireless communication device to the information terminal device; a receiving signal level detection block that outputs a plurality of different detection signals according to intensity of the high-frequency signal received through the antenna; a first switching block that for turning on or off, for each of the transmitter circuit, the base-band signal processing circuit, and the interface circuit, power fed from the power supply circuit thereto; a first memory block for storing data as to which of the transmitter circuit, the base-band signal processing circuit, and the interface circuit to turn on or off in association with each of the detection signals; and a first control block for controlling the first switching block so as to turn on or off power fed to each of the transmitter circuit, the base-band signal processing circuit, and the interface circuit according to the detection signals and the data stored in the first memory block.