Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 13, 2008
Patent Application Number
10555136
Date Filed
February 28, 2005
Patent Primary Examiner
Patent abstract
An antenna device has a core made of a magnetic material, a coil formed by winding a conducting wire on a predetermined range including the core and the outer region of the core, and a sub-core that adjusts the resonance frequency by moving in the inner peripheral region of the coil and in the direction orthogonal to the winding direction of the coil. A communication system of the present invention is a combination of an external communication device, the antenna device, and an internal communication device that is connected to the antenna device and is disposed in a cabin.
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