| 摘要 |
PURPOSE:To provide a broad band frequency characteristic used in common use for plural frequencies without the need for a matching circuit as a separate circuit for a feeding path by providing a degree of sensitivity capable of receiving a radio wave in the standby state even when a retractable antenna element is accommodated so as to allow the antenna to hardly receive effects of a human body in contact with a case or the like. CONSTITUTION:A metallic cylinder 2 accommodating a 1st antenna rod element 1 in its inside retractably is provided, a linear metal 3 is arranged nearly along a center axis of the metallic cylinder 2 and a feeder 4 is connected to a lower part of the metallic cylinder 2 and the linear metal 3. Furthermore, a contact fixture 5 in slide contact with the 1st antenna element 1 connecting to the linear meal 3 and a 2nd antenna coil element 6 in contact with a tip of the element 1 while the 1st antenna element 1 is accommodated in the inside of the metallic cylinder 2 are provided to an upper part of the metallic cylinder 2. |
