| 摘要 |
PURPOSE:To evade the dead zone of radio waves, to prevent the instantaneous interruption of radio waves and to always keep a clear communication state by placing first and second antennas in a certain space to be opposite and setting them in different ground height and at different beam angle. CONSTITUTION:The first and the second antennas 10 and 20 are set in a certain space to be opposite each other so as to save the dead zone of radio waves near a radio relay station. And the ground height and the beam angle of the first and the second antennas 10 and 20 are set different and it is prevented that the radio waves which is transmitted and received by one of the opposite antennas are cut off by another antenna. Moreover, the antennas 1 and 2 which are opposite between adjacent radio relay stations are connected with wireless equipments (a) and (b), which transmit and receive the different frequencies, so that the interference of radio waves in the same zone can be evaded. Thus the clear communication can be possible without the instantaneous interruption of radio waves.
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