| 摘要 |
PURPOSE:To allow one antenna to be resonated with two different frequencies and to allow the antenna to hardly receive the effect of a human body or the like in contact with a case of the antenna. CONSTITUTION:A metallic cylinder 2 whose center axis is continuous to a lower end of an antenna rod element 1 is provided and a linear metal 3 is arranged nearly the center axis of the metallic cylinder and a feeding line 4 interconnected between the rod metal 3 and the metallic cylinder 2 is provided to a lower part of the metallic cylinder 2. Furthermore, a notch 5 is provided to the upper part of the metallic cylinder 2. Thus, mechanical strength is realized with a simple structure and power loss is reduced. |
