Estimation and Comparison of Antenna Temperature and Water Vapor Attenuation at Microwave Frequencies over Northern and Southern Latitude
S.Mondal1,  N. SK2,  P.K. Karmakar3

1S. Mondal, Department of Electronics and Communication Engineering, Dumkal Institute of Engineering & Technology, Murshidabad (West Bengal), India.
2N. S. K, M.Tech, Department of ECE, Dumkal Institute of Engineering & Technology, Murshidabad (West Bengal), India.
3Dr. P. K. Karmakar, Department of Radiophysics & Electronics, University of Calcutta, Kolkata (West Bengal), India.
Manuscript received on 8 December 2013 | Revised Manuscript received on 18 December 2013 | Manuscript Published on 30 December 2013 | PP: 135-139 | Volume-3 Issue-7, December 2013 | Retrieval Number: G1406123713/13©BEIESP
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Abstract: Radiosonde data available from British Atmospheric Data Centre (BADC) over Chongging, (29.0 N), China and Porto Alegre(29.0 S), Brazil were analyzed to determine the variation of antenna temperature and water vapor attenuation in the frequency range 5 GHz -40 GHz during two different season namely, winter season and rainy season. Antenna temperatures at 5, 10, 20, 22.235, 23.834, 30, 35 and 40 GHz have been determined for the different value of water vapor content during January-February and July-August over these two places. Antenna temperature and attenuation increases with increase in frequency, thereafter, becoming maximum at the water vapor resonance line of 22.235 GHz. With further increase of frequency beyond 22.235 GHz and up to 31 GHz, the antenna temperature and attenuation decreases. Again after 31 GHz, Antenna temperature and attenuation is increasing in nature.
Keywords: Antenna Temperature, Attenuation, Water Vapor, Water Vapor Content.

Scope of the Article: Microwave Filter