Antenna device and wireless communication device
First Claim
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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Accused Products
Abstract
An antenna device includes a feed coil and a sheet conductor. The feed coil includes a magnetic core and a coil-shaped conductor, which is provided around the magnetic core. An RFIC is connected to the feed coil. The sheet conductor has a larger area than the feed coil. A slit that extends from a portion of the edge of the sheet conductor toward the inner side of the sheet conductor is provided in the sheet conductor. The feed coil is arranged such that the direction of the axis around which the feed coil is disposed is parallel or substantially parallel to the directions in which the sheet conductor extends. The feed coil is arranged such that the feed coil is close to the slit and one of coil openings at the ends of the feed coil faces the slit.
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Citations
16 Claims
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1. An antenna device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communication device comprising:
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an antenna device; and a communication circuit connected to the antenna device;
whereinthe antenna device includes a feed coil and a sheet conductor, the feed coil including a coil-shaped conductor; the 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 close 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 wireless communication device further comprises a capacitor connected to the sheet conductor near an open end of the slit so as to straddle the slit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification