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US 2014/0176382 A1Published application
Antenna device and communication terminal apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorsShinichi NAKANO, Noboru KATO, Kuniaki YOSUI
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Abstract
An antenna device includes a feed coil connected to a feed circuit, and a coil antenna disposed near the feed coil. A ferrite sheet, in which a magnetic loss term in a usable frequency band is relatively large, is provided between the feed coil and the coil antenna. The feed coil and the coil antenna are magnetically coupled to each other via the ferrite sheet. With this configuration, signal transmission efficiency between the feed coil and the coil antenna is enhanced.
Claims21
(canceled)
An antenna device comprising:
- a feed coil connected to a feed circuit;
- a coil antenna disposed near the feed coil;
- and
- a magnetic layer provided between the feed coil and the coil antenna;
- wherein
- a product of a relative permeability of a magnetic material of the magnetic layer and a thickness of the magnetic layer is less than twenty;
- and
- the feed coil and the coil antenna are magnetically coupled to each other via the magnetic layer.
5 more elements
A communication terminal apparatus comprising:
- a housing;
- a feed circuit provided in the housing;
- a feed coil connected to the feed circuit;
- a coil antenna disposed near the feed coil;
- and
- a magnetic layer provided between the feed coil and the coil antenna;
- wherein
- the feed coil and the coil antenna are electromagnetically coupled to each other via the magnetic layer.
5 more elements
Dependencies are inferred from the claim text.