| 摘要 |
<p>An antenna device comprising a core formed of a magnetic element, a coil formed by winding a linear conductor in a specified range including the core and an area external to the core, and a sub-core moving in the inner peripheral area of the coil and in a direction perpendicular to the winding direction of the coil to regulate a resonance frequency. A communications system comprising, combined together, an external communication device, an antenna device, and an internal communication device connected with this antenna device and disposed in a vehicle room.</p> |
