Kenneth C. Allen

Abstract: A simple model of the attenuation of millimeter waves by precipitating liquid water clouds is presented. As frequency increases from the microwave band into the millimeter wave band, the model indicates a significant increase in the relative importance of the attenuation due to the suspended liquid water of cumulus clouds in comparison with that due to the rain produced by the clouds. For the upper portion of the millimeter, wave band, the cumulative distribution of attenuation due to rain is overshadowed by the attenuation due to clouds. The need for an adequate cloud model for the accurate prediction of earth–space millimeter wave link performance is indicated. A short review of measurements of attenuation by clouds is presented for comparison with model predictions.

Keywords: millimeter waves; attenuation; attenuation distribution; cloud attenuation; clouds; millimeter-wave propagation

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

Back to Search Results