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Abstract
The aperture-to-medium coupling loss (Lgp) of large size antennas in trans-horizon paths reduces the effectiveness of very large antennas. There are considerable variations in the theoretical approaches and practical results reported in the literature. Radio refractivity and its gradient also affect the value of coupling loss. The paper describes measurements, results and analysis of practical measurement carried out for the first time in India. Lgp for a combination of 10' transmitting and 85' receiving antennas is seen to be about 11.5 dB at medium conditions and about 13.9 dB at low-signal conditions. Lgp for 85' antenna at 2 GHz has been found about 10 dB. Lgp for 85'-85' antenna combination works out to be about 20 dB which is not in agreement with the value computed by N BS Tech Note No. 101. Experiments have been carried out to verify Lgp for 85' - 85' combination and results will be reported subsequently.
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S.C. Jyotipunj
Subhash C Jyotipunj (Sqn Ldr): Graduated from Punjab University in 1960 and did his B.E. (Elect) with distinction from Indian Institute of Science, Bangalore in 1964. He later did his Post-graduation from I.I.Sc., Bangalore in 1974 in Digital Communication and Data Processing. He has worked as Maintenance Engineer for Guided Weapons in Air Force and Technical Instructor at Air Force Technical College. At present, he is Deputy Project Engineer (Systems Techniques Development) in Radar and Communication Project Office, Ministry of Defence.