| 摘要 |
PURPOSE:To improve the directivity characterisric and the earthquake resistance and wind resistance by arranging plural number of unit antennas comprising a central feeding multi-stage crossing type vertical antenna around a vertical supporting pole. CONSTITUTION:Upper and lower supports 21, 22 are fixed near both ends of the vertical supporting pole 1. The unit antennas 61-64 are supported around the supporting pole 1 in parallel to the upper/lower supports 21, 22. The unit antannas 61-64 consist of the central feeding multi-stage crossing type vertical antenna. For example, plural number of coaxial dipole antenna elements are connected in cascade and they are energized from the central part. Through the forming above, the excellent desired directivity characterisric is obtained and the earthquake resistance and wind resistance are improved. |
