| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device that operates with high sensitivity and with high efficiency even in a frequency (for example, a UHF band) higher than several tens of MHz by using a GND (ground) conductor as an antenna component effectively. SOLUTION: The antenna device includes: a GND conductor 1; and a coil 2 arranged at an end of the GND conductor separately from the GND conductor, and connected to a feed point 1a and a ground point 1b formed separately from the GND conductor 1 with one end as a feeding end 2a and the other end as a ground end 2b, respectively. At least the pitch and the number of turns of the coil 2 and a distance between the coil and the GND conductor are set so as to perform parallel resonance in a frequency higher than several tens of MHz. COPYRIGHT: (C)2011,JPO&INPIT
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