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Antenna device and communication apparatus

  • US 9,607,260 B2
  • Filed: 04/11/2014
  • Issued: 03/28/2017
  • Est. Priority Date: 11/08/2011
  • Status: Active Grant
First Claim
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1. An antenna device comprising:

  • a plate-shaped base member configured to be attached to a communication terminal or included in the communication terminal;

    an antenna coil configured with the plate-shaped base member; and

    a feeding coil that is magnetically coupled to the antenna coil, that is configured with the plate-shaped base member together with the antenna coil, and that is configured to receive and output a feeding signal;

    whereinthe antenna coil includes a first coil conductor having a first winding axis that extends in a direction perpendicular or substantially perpendicular to a principal surface of the plate-shaped base member;

    the feeding coil is a chip component and includes a second coil conductor having a second winding axis that extends in a direction perpendicular or substantially perpendicular to the first winding axis;

    the feeding coil further includes a first end face that is perpendicular to the second winding axis and a second end face that is opposed to the first end face;

    the feeding coil and the antenna coil do not have a single current path;

    a width of the feeding coil in a direction that is perpendicular to the second winding axis is smaller than a width of the antenna coil in a direction that is parallel or substantially parallel to the principal surface of the plate-shaped base member;

    a portion of the second coil conductor overlaps with the first coil conductor in the direction perpendicular or substantially perpendicular to the principal surface of the plate-shaped base member; and

    a minimum distance between the first end face and a center of the antenna coil is shorter than a minimum distance between the second end face and the center of the antenna coil.

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