| 摘要 |
The present invention provides a collinear antenna capable of obtaining a radiation mode that is suitable for communication on a plurality of frequencies. Each section between the first section sleeveelement (10) and the fifth section sleeve element (40) consists of an upper section sleeve and a lower section which form a dipole antenna, wherein, the five sections are overlaid. The sleeve element s of each section feeds different frequency signals by two coaxial lines (90, 91) which are connected with antenna feeding parts (92, 93), and are drove by different frequency signals in phase. In this case, electrics length of the two coaxial lines (90, 91) between feeding points of sleeve elements of each section are set to be almost integral multiple of the wavelength of transmitted frequency signals. |
