Radio IC device

摘要

A radio IC device that can be used in a plurality of frequency bands for RFID tags and that is compact and has superior radiation characteristics is provided. A spiral line electrode portion and a first side electrode, extending from an inner end thereof, of a capacitor electrode portion are provided on a top surface of a sheet-shaped substrate, and a second side electrode arranged to face the first side electrode and a crossing line electrode are provided on a bottom surface of the substrate. A first radio IC chip is arranged at a location in the line electrode portion, and a second RFID tag radio IC is arranged so as to be connected to a front-to-back connection portion and an end of an electric-field radiation electrode portion. The radio IC chip rectifies an RF signal in a first frequency band and outputs and supplies power to the second RFID tag radio IC.

主权项

1. A radio IC device comprising:
a first radiation electrode; a second radiation electrode; a first radio IC electrically connected or electromagnetically coupled to the first radiation electrode and arranged to receive a first RF signal through the first radiation electrode; and a second radio IC electrically connected or electromagnetically coupled to both of the first and second radiation electrodes and arranged to transmit and receive a second RF signal through both of the first radiation electrode and the second radiation electrode; wherein a first frequency band of the first RF signal is different from a second frequency band of the second RF signal; the first radio IC includes a circuit arranged to rectify the first RF signal and to supply power to the second radio IC to transmit and receive the second RF signal; and the first frequency band is lower than the second frequency band, and the first radiation electrode includes a magnetic-field radiation electrode portion having a resonant frequency lower than the second frequency band and arranged to function as a magnetic-field radiation electrode for the first RF signal.