Booster antenna, communication IC unit mounted with booster antenna, and communication IC unit equipped with booster antenna

摘要

[Problem] To provide a booster antenna that exhibits high communication performance when attached to a conductor, a communication IC unit equipped with a booster antenna, and a communication IC unit equipped with a booster antenna having an attached conductor. [Solution] A booster antenna 1 according to the present invention is provided with: a coil 20 that is wound less than one turn and that is formed of an upper-surface-side conductor 21 attached to an upper surface side of a substrate 10, a lower-surface-side conductor 22 attached to a lower surface side of the substrate, and a connection conductor 23 attached to an interior or a lateral surface of the substrate to electrically connect an end section of the upper-surface-side conductor and an end section of the lower-surface-side conductor; and an installation section 30 for installing a communication IC unit 50 equipped with an antenna on the upper surface side of the substrate. When the lower-surface-side conductor and a conductor are electrically contacted and connected, a conductor 100 functions as an antenna.