LOSSES DUE TO RAIN ON RADOMES AND ANTENNA REFLECTING SURFACES.
DEFENCE RESEARCH TELECOMMUNICATIONS ESTABLISHMENT OTTAWA (ONTARIO)
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A brief theoretical study was undertaken to determine to what extent losses due to rain falling on a radome enclosing a large parabolic reflecting antenna would be expected to impair the performance of systems operating at frequencies above 2 Gc. Effects of increases in antenna noise temperature are not considered. Losses due to water layers on perfectly reflecting surfaces were also investigated in order to determine to what extent the problem would be alleviated if no radome were present. It is appreciated that in many circumstances these considerations may not be of any major importance in determining whether or not a radome is to be used. The values of the real and imaginary parts of the complex relative dielectric constant of water obtained at a number of frequencies between 380 Mc and 35 Gc by Grant, Buchanan, and Cook have been used as the basis for calculations of the effects of rain water described.