Antenna device and method of setting resonant frequency of antenna device
First Claim
1. An electronic appliance comprising:
- a casing including an inner surface and an outer surface;
an antenna device; and
a camera module provided in the casing and including a lens;
whereinthe antenna device includes;
a coil conductor having a loop shape or a spiral shape in which a winding center portion defines a coil opening; and
a conductor layer that is closer to an antenna on a communication partner side than the coil conductor is relative to the antenna on the communication partner side;
the conductor layer includes a conductor opening and a slit, the slit connecting the conductor opening and an outer edge of the conductor layer;
when the coil conductor is viewed in plan view, the coil conductor and the conductor layer are superposed one on top of the other;
the conductor layer is arranged to function as a radiator to radiate a magnetic field;
at least a portion of the lens of the camera module is exposed in the conductor opening of the conductor layer;
the casing includes a metal portion; and
the conductor layer is defined by at least a portion of the metal portion of the casing.
1 Assignment
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Accused Products
Abstract
In antenna device, a coil conductor of an antenna coil module and a conductor layer at least partially overlap. A current flows in the conductor layer to block a magnetic field generated by a current flowing in the coil conductor. A current, which flows around the periphery of an opening of the conductor layer, flows along the periphery of a slit and around the periphery of the conductor layer due to a cut-edge effect. Since magnetic flux does not pass through the conductor layer, magnetic flux attempts to bypass the conductor layer along a path in which the conductor opening of the conductor layer is on the inside and the outer edge of the conductor layer is on the outside. As a result, the magnetic flux generates relatively large loops that link the inside and the outside of a coil conductor of an antenna on a reader/writer side.
192 Citations
8 Claims
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1. An electronic appliance comprising:
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a casing including an inner surface and an outer surface; an antenna device; and a camera module provided in the casing and including a lens;
whereinthe antenna device includes; a coil conductor having a loop shape or a spiral shape in which a winding center portion defines a coil opening; and a conductor layer that is closer to an antenna on a communication partner side than the coil conductor is relative to the antenna on the communication partner side; the conductor layer includes a conductor opening and a slit, the slit connecting the conductor opening and an outer edge of the conductor layer; when the coil conductor is viewed in plan view, the coil conductor and the conductor layer are superposed one on top of the other; the conductor layer is arranged to function as a radiator to radiate a magnetic field; at least a portion of the lens of the camera module is exposed in the conductor opening of the conductor layer; the casing includes a metal portion; and the conductor layer is defined by at least a portion of the metal portion of the casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification