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Antenna device and wireless communication device

  • US 9,768,511 B2
  • Filed: 11/11/2015
  • Issued: 09/19/2017
  • Est. Priority Date: 05/21/2012
  • Status: Active Grant
First Claim
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1. An antenna device comprising:

  • a feed coil including a coil-shaped conductor; and

    a sheet conductor having a sheet shape;

    whereinthe sheet conductor has an area larger than an area of the feed coil;

    a slit that extends from a portion of an edge of the sheet conductor toward an inner side of the sheet conductor is provided in the sheet conductor, or an opening and the slit are provided in the sheet conductor, the opening being connected to the slit;

    the feed coil is arranged such that a direction of an axis around which the coil-shaped conductor is disposed differs from a direction perpendicular or substantially perpendicular to the sheet conductor;

    the feed coil is arranged such that a coil opening at one end of the coil-shaped conductor is adjacent to the slit, or a portion of an edge of the opening and the coil opening faces the slit or the portion of the edge of the opening;

    the feed coil and the sheet conductor are coupled to each other through a magnetic field; and

    the antenna device further comprises a capacitor connected to the sheet conductor near an open end of the slit so as to straddle the slit.

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