Apparatus comprising an RFID device

摘要

To provide a radio IC device miniaturized without degrading the radiation characteristics. A radio IC device includes an electromagnetic coupling module (1) including a radio IC chip (5) processing transmitted and received signals and a feed circuit board (10) having an inductance element. The feed circuit board (10) has an external electrode electromagnetically coupled to the feed circuit, and the external electrode is electrically connected to a shielding case (28) or a wiring cable. The shielding case (28) or the wiring cable functions as a radiation plate. The radio IC chip (5) is operated by a signal received by the shielding case (28) or the wiring, and the answer signal from the radio IC chip (5) is radiated from the shielding case (28) or the wiring cable to the outside. A metal component may function as the radiation plate, and the metal component may be a ground electrode disposed on the printed wiring board (20).