RADIO IC DEVICE, ELECTRONIC DEVICE, AND METHOD FOR ADJUSTING RESONANCE FREQUENCY OF RADIO IC DEVICE

摘要

A wireless IC device and an electronic apparatus are obtained, which can achieve miniaturization and improve the gain of a radiator plate (electrode) without providing a dedicated antenna. A wireless IC device is provided, in which a loop electrode (31) is provided in a ground electrode (21) provided on a printed wiring circuit board (20), and in which a wireless IC chip (5) that processes a transmission/reception signal or an electromagnetic coupling module (1) is coupled to the loop electrode (31). The ground electrode (21) is coupled to the wireless IC chip (5) or the electromagnetic coupling module (1) via the loop electrode (31), and transmits or receives a high-frequency signal. The ground electrode (21) is formed with a slit (23a), (23b) for adjusting a resonant frequency thereof.