| 摘要 |
Radiowaves antenna basically consisting of a parabolic reflector and a feed, able to radiate according to mode TE11, or according to the combination of modes TE11 and TM11, characterized in that, in case of radiation according to mode TE11, said reflector has a ratio (f D) between the focal distance (f) and the maximum diameter (D) comprised between 0,46 and 0,50 and said feed has a ratio ( alpha ) between the aperture radius (a) and the central wavelength tau of the utilized frequency band comprised between 0,52 and 0,60: also characterized in that, in case of radiation according to the combination of modes TE11 and TM11, a direct and linear proportionality is defined between said ratio (f/D) of the reflector and said ratio ( alpha ) of the feed.
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