DATA CARRIER FOR MOBILE BODY IDENTIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To shield a transmission reception coil without decreasing a transmission reception distance with a simple configuration. SOLUTION: A conductor pattern made of a copper foil is formed in spiral onto one side (side A) of a flat printed circuit board 1 and the conductor pattern acts like a transmission reception coil 2. Circuit components such as a signal processing IC 5 are mounted on the other side (side B) of the printed circuit board 1. Furthermore, a shield conductor pattern 6 consisting plural conductor patterns 61 ,... is formed to an idle space of the side B on which the circuit components are not mounted. A torus slit 8 is provided among the conductor patterns 61 ,.... Since the transmission reception coil 2 and the shield conductor pattern to shield the transmission reception coil 2 are formed on both the sides of the printed circuit board 1, the shielding is conducted with a simple configuration.