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Theory and experiment of a mobile radio communication in tunnels by means of a leaky braided coaxial cable
Author(s) -
Degauque P.,
Demoulin B.,
Fontaine J.,
Gabillard 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/rs011i004p00305
Subject(s) - coaxial cable , attenuation , repeater (horology) , transmission line , coaxial , electrical engineering , acoustics , line (geometry) , coupling (piping) , transmission (telecommunications) , telecommunications , physics , computer science , optics , geometry , engineering , cable gland , mechanical engineering , mathematics
To realize a radio wave communication along mine galleries a few kilometers long without repeater, we show that it is possible to use a leaky braided coaxial cable, with an inductive coupling to the tranceivers. By using the transmission line theory, we determine the optimal electrical and geometrical constants of the cable. A communication 2 km long has been demonstrated for a total transmission loss along the line of about 70 dB. We also account for the possibility in which the cable is situated close to the wall along a short distance and we show that the increase in attenuation of the monofilar mode does not have a great influence on the performance of the cable. The theoretical approach is confirmed by experimental data for a number of specific cases.