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Calculated transmission loss for a leaky feeder communication system in a circular tunnel
Author(s) -
Hill David A.,
Wait James R.
Publication year - 1976
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/rs011i004p00315
Subject(s) - coaxial cable , attenuation , twisted pair , braid , transmission (telecommunications) , transmission loss , coaxial , range (aeronautics) , dipole , acoustics , physics , coupling (piping) , electrical engineering , telecommunications , optics , materials science , computer science , engineering , aerospace engineering , cable gland , quantum mechanics , metallurgy , composite material
The transmission loss for a leaky coaxial cable communication system in a circular tunnel is calculated for an idealized model. The transmitting and receiving antennas are electric dipoles that may be located anywhere within the tunnel. For typical cable parameters, the optimum frequency is found to be in the range from 2 to 10 MHz. Calculations reveal that the use of a sparse braid and a high velocity cable will strongly improve the cable‐dipole coupling with only a small penalty of a higher attenuation rate.