| 摘要 |
PURPOSE:To provide a characteristic suitable for communication location to one antenna system by providing an antenna element fitted to an antenna support whose feeding point is moved by the expansion/contraction of the support and a matching circuit eliminating the mis-matching due to the movement of the feeding point. CONSTITUTION:The antenna element 4 is provided to the tip of the antenna support 3 and the antenna element 4 is connected to a feeding cable 6 via the matching circuit 5. The matching circuit 5 is a circuit to compensate the mis- matching in moving the feeding of the antenna element 4 vertically and uses an inductive or capacitive reactance. A motor 7a is driven forward/ reverse to expand/contract the antenna support 3 and to move vertically the feeding point of the antenna element 4 thereby changing the radiation angle, then the characteristic suitable for the location is given by using one antenna system.
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