| 摘要 |
PURPOSE:To prevent the increase of loss of a radome for heavy rain fall and snowfall by providing the radome with many minute holes or attaching an elastic cover to the surface of the radome to add the drop-proof structure which increases and reduces the air pressure in the radome or the cover at intervals of a certain time. CONSTITUTION:A parabolic antenna 1 attached to the side of a primary radiator 6 provided in the front end of a waveguide feeder 7 added to a transmitter- receiver 5 is provided with a conical radome 2 consisting of reinforced plastics or the like for the purpose of preventing trouble, and this radome 2 is provided with many minute holes 21. An air delivery pipe 71 is attached to the waveguide feeder 7 and is provided with a pump 4 operated by a rain fall sensor 8. When air sent from the pump 4 is sent into the parabolic antenna 1 through the waveguide feeder 7, the air pressure in the parabolic antenna 1 is made higher than that of the outside and air is always blown out from minute holes 21 provided on the radome 2. Thus, rain and snow drops sticking to the surface of the radome 2 are scattered by this air.
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