| 摘要 |
An antenna made by winding a coil on the periphery of a rod-like core made of a magnetic material is housed inside a pillar having a relatively small width and disposed in a manner such that its axis line is nearly orthogonal to the vertical axis line of the pillar. With this arrangement, a predetermined communication range is secured as the electromagnetic waves radiated from the antenna are barely absorbed by the vehicle body and radiated to inside the cabin as well as to the outside. Accordingly, an inexpensive antenna device and a communications system using it are provided which enable communication with a portable device inside and outside a vehicle cabin using a single antenna.
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