| 摘要 |
PROBLEM TO BE SOLVED: To widen a tuning band width by relaxing inclination of a frequency characteristic curve of reactance component of an antenna. SOLUTION: An antenna unit 20 includes a ground board 11, a base body 21 of dielectric body or magnetic body that is attached on the ground board 11, and an antenna element 1 consisting of radiation conductor 22 provided on the base body 21. A projection electrode 26 is provided of which a base end part is connected to a ground 23 of the antenna unit 20 while a tip end part is extended to the radiation conductor 22 side. So, the capacitance generated between the ground 23 and the antenna is increased to relax the inclination of frequency characteristics curve of the reactance component of the antenna unit 20, resulting in a widened tuning band width. COPYRIGHT: (C)2009,JPO&INPIT
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