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Fading reduction in microwave IOS links using antenna beam tilting techniques
Author(s) -
Prasad M. V. S. N.,
Dutta H. N.,
Sarkar S. K.,
Reddy B. M.
Publication year - 1991
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/90rs02690
Subject(s) - fading , fade , microwave , signal (programming language) , antenna (radio) , microwave transmission , refraction , remote sensing , signal strength , environmental science , reduction (mathematics) , telecommunications , optics , acoustics , physics , geology , computer science , mathematics , decoding methods , geometry , programming language
Microwave field strength measurements are conducted on a round the clock basis on an operational communication link in northern India. In winter and premonsoon months, nighttime signal exhibits deep fades with fall in median signal level. The investigations revealed that nighttime fading is due to the refraction of signal from ground‐based layers. To minimise the amount of energy refracted by the ground‐based layers, the antennae were tilted upward. The tilting of antennae has decreased the fade depths, and an improvement in the performance of the link is obtained.