| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device that is capable of eliminating restrictions on an installation position of a coil as an antenna element and that has a plurality of resonance frequencies whose fluctuations caused by an external force are small. <P>SOLUTION: The antenna device includes: a plurality of coils that are formed into a tubular shape by turning a conducting wire a plurality of times to form a spiral shape; a feeding point that is connected to at least one of the plurality of coils; ground plates that are formed from a metal conductor; and ground points that connect the ground plate with the plurality of coils. The ground points are start points and finish points of the plurality of coils except those of the coils connected with the feeding points. <P>COPYRIGHT: (C)2012,JPO&INPIT |
