Rain attenuation measurements at 94 GHz: Comparison of theory and experiment
Abstract
Measurements were made of attenuation at 94 GHz caused by rain on a 935 m terrestrial path since October 1977. Simultaneously the raindrop size distribution was measured with a distrometer, together with the rainfall intensity recorded with three rapid response rain gauges spaced about 500 m apart along the propagation path. Using the actually measured raindrop size distribution and assuming spherical raindrops, the attenuation caused by rain was calculated with the aid of Mie's scattering theory for water spheres. The result is compared with the measured data. In case of uniform rainfall along the path a good agreement was observed between the measured and the calculated attenuation. The propagation link, the experimental results and the comparison between theory and measurement is presented. The decrease of antenna gain at 94 GHz due to water on a 1.2 m Cassegrain antenna is shown that for accurate propagation measurements it is absolutely necessary to equip the antennas with protective shelters.
- Publication:
-
In AGARD Millimeter and Submillimeter Wave Propagation and Circuits 9 p (SEE N79-23264 14-31
- Pub Date:
- February 1979
- Bibcode:
- 1979mswp.agarV....K
- Keywords:
-
- Electromagnetic Wave Transmission;
- Rain;
- Wave Attenuation;
- Cassegrain Antennas;
- Microwave Frequencies;
- Millimeter Waves;
- Particle Size Distribution;
- Submillimeter Waves;
- Wave Propagation;
- Communications and Radar