| 摘要 |
PURPOSE:To improve the ratio of a desired wave to a distrubing ratio to a land mobile station by providing an array antenna where a directivity within a vertical plane has two upper/lower main lobes in the horizontal direction and has no sensitivity in the horizontal direction to a base station to reduce fading to an aircraft. CONSTITUTION:The directivity characteristic in the vertical plane of a base station use array antenna 2 has two main lobes 31, 31' at the lower and upper side in the horizontal direction and has no sensitivity in the horizontal direction, the upper main lobe 31 is used for an aircraft telephone subscriber 4 for communication and the lower main lobe 31' is used for an automobile telephone subscriber 5. The depression angle of the main lobe 31' is set to have the maximum gain at slightly inner side from a radio zone peripheral part of the said radio base station 1. Thus, the communication between the base station 1 and the subscriber 4 reduces fading due to reflection on sea surface and the communication with the subscriber 5 is improved for the ratio of desired wave to disturbed wave. |
