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Wireless IC device

  • US 9,022,295 B2
  • Filed: 10/16/2013
  • Issued: 05/05/2015
  • Est. Priority Date: 05/21/2008
  • Status: Active Grant
First Claim
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1. A wireless integrated circuit device comprising:

  • a wireless integrated circuit arranged to process a certain radio signal;

    a power-supply circuit board that is connected to the wireless integrated circuit, that has a power-supply circuit including at least one coil pattern, and that has one main surface and another main surface; and

    a radiation plate arranged to radiate a transmission signal supplied from the power-supply circuit board or to receive a reception signal and supply the reception signal to the power-supply circuit board;

    whereinthe radiation plate includes an opening connected to an outer portion of the radiation plate, or an opening and a slit that connects the opening and an outer edge portion of the radiation plate;

    when viewed in a direction of a winding axis of the coil pattern, the opening in the radiation plate overlaps with at least a portion of an inner area of the coil pattern;

    a mounting electrode is disposed on the one main surface of the power-supply circuit board, and the power-supply circuit board is connected to the radiation plate by the mounting electrode;

    the mounting electrode is disposed at a position such that both ends of the opening or the slit of the radiation plate are not electrically connected to each other;

    a main portion of the mounting electrode is disposed in an area of the one main surface of the power-supply circuit board other than the inner area of the coil pattern when viewed in the direction of the winding axis of the coil pattern;

    the radiation plate is a single unitary radiation plate, and the opening or the opening and the slit are provided in the single unitary radiation plate; and

    the mounting electrode is configured so as not to connect the power-supply circuit to the radiation plate.

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