| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna, which more widens a band while having bidirectional dicrectivity at a low posture by electromagnetically coupling one of terminal part areas of a second conductor and the terminal part area of a first conductor or power feeding conductor. SOLUTION: An L-shaped conductor 21 is composed of a terminal part area, installed almost vertically to a ground conductor 3 and a parallel part area installed almost in parallel with the ground conductor 3. For a power feeding conductor 22 , one terminal part is connected with the core conductor of a coaxial plug arranged on the rear side of the ground conductor 3 at a power feeding point 4, and the other terminal part is connected with one point separated from one terminal part of the L-shaped conductor 21 in the relation almost parallel to the ground conductor 3 at a prescribed distance. Such a point is selected corresponding to the impedance value of the coaxial line to be connected, and LA is selected almost toλo /4 of a central frequency to be used. A semi-loop-shaped conductor 1 is U-shaped, both the terminal parts are electrically connected with the ground conductor 3, and its length is selected almost toλo /2 of the using central frequency.
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