Yearly variability of rain attenuation over a communication link at 13 GHz during monsoon months over Indian eastern region

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In this paper, results on yearly variability of measured attenuation at 13 GHz under rainy conditions over a microwave communication link path situated between Sarojini College and Airport of Dum Dum area in Kolkata have been presented. The link belongs to an user agency and suffers a large attenuation due to heavy rain. The variation microwave amplitude was monitored and rain rate measurements were made on regular basis simultaneously by a fast response rain gauge in the monsoon months during 2007 and 2008. The observed microwave radio signal was characterized with a steady signal level ~−42 to −43 dBm with fade depth ~1 to 2 dB under clear sky situation. The results on attenuation have been studied in relation to simultaneous rain rate measurements. Yearly variability of rain attenuation has also been highlighted. These results are also useful for designing and installation of future microwave communication links both for terrestrial and satellite paths in this part of India, where rain characteristics are similar to Indian eastern coastal station. The probability distribution of attenuation and rain rates has been deduced from measured observations.