Radio IC device
First Claim
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;
whereina 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
132 Citations
17 Claims
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1. A radio IC device comprising:
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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;
whereina 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification