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The bicoaxial leaky line and its applications to underground radio communication
Author(s) -
Martin D. J. 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/rs011i010p00779
Subject(s) - bifilar coil , coaxial cable , coaxial , transmission line , computer science , twisted pair , electrical engineering , communications system , electronic engineering , engineering , cable gland , current (fluid) , rogowski coil
The bicoaxial leaky line comprises two separate leaky cables spaced closely parallel so that the two outer braids or conductors form a bifilar transmission line. The type of construction was developed first as a research tool in the study of mode‐conversion processes in leaky coaxial cables and to test previously developed theories; the single‐wire modes of the two constituent cables combine to form a bifilar mode which can be more accurately predicted and measured. As well as serving this purpose, the new cable lends itself to a new configuration of leaky cable radio communication system in which line repeaters are bridged between the constituent coaxial cables in alternate directions instead of being connected simply in series; midspan filters ensure system stability. Such a system provides duplex communication from a unified base station using simple one‐way repeaters and is particularly adaptable to spurs and branching. The inherent “tailback” feature also provides a particularly consistent level of coupled signal through the system. The overall system of bicoaxial cable and line repeaters will accommodate several separate radio channels simultaneously and thus constitutes a bidirectional “communications highway” for mining use.