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Mining Publication: Transmit Antennas for Portable VLF to MF Wireless Mine Communications
Keywords: Antennas Coal mining Communications Medium frequency communications systems Radios 
 Wireless node communications systems
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: September 1977
Authors: RL Lagace, DA Curtis, JD Foulkes, JL Rothery
Contract/MOA Report - September 1977
Download PDF Document (5.20 MB)
NIOSHTIC2 Number: 10001390
Arthur D. Little, Inc. U.S. Bureau of Mines contract No. H0346045. NTIS No. PB 285 004, 1977; :1-158
An investigation is made of the feasibility of developing compact transmit antennas and/or other means to efficiently couple VLF to MF band radio energy between portable wireless communication units in coal mines. The completely wireless communication ranges between two portable radios equipped with practically-sized reference loop antennas in representative coal mine environments are estimated. Antenna technology is assessed with respect to transmit moment, range, intrinsic safety, battery and wearability requirements to determine the most suitable antenna types for use by miners. It is concluded that air-core bandolier loop antennas, and perhaps ferrite-loaded loop antennas, having peak transmit moments of about 2.5 ampere-m2 will be the most effective antenna choices for portable units. This choice, however, will not allow the range goal of 1350 feet to be attained in mines having unfavorable signal attenuation and noise environments. Rectangular air-core loops are compared with grounded horizontal-wire and vertical-wire mode exciters for fixed station applications. The potential for significantly increasing the wireless communication range by inductively coupling to communications and power lines in a mine is evaluated and found to be considerable based on theoretical coupling equations. Lastly, the theoretical performance of a hybrid noise cancelling diversity receiving technique that utilizes both the electric and magnetic field components of the ambient noise to improve the receiver output signal-to-noise ratio under certain adverse conditions is estimated and shown to be favorable when the magnetic and electric field noise components are highly correlated.
Image of publication Transmit Antennas for Portable VLF to MF Wireless Mine CommunicationsContract/MOA Report - September 1977
Download PDF Document (5.20 MB)
NIOSHTIC2 Number: 10001390
Arthur D. Little, Inc. U.S. Bureau of Mines contract No. H0346045. NTIS No. PB 285 004, 1977; :1-158
See Also
Antenna Design & Coupling Studies at Medium Frequency for lmproved Coal Mine Communications
The Implementation of UHF Radio Communications and CCTV Monitoring Systems in a Room and Pillar Metal/Non-metal Mine
Medium Frequency Radio System Modifications for Refuge Chamber Situational Awareness
A Medium Frequency Wireless Communication System for Underground Mines
A Medium Frequency Wireless Communication System For Underground Mines
Medium-Frequency Propagation in Coal Mines
Propagation of EM Signals in Underground Mines
Research and Development Contract for Coal Mine Communication System: Volume 4 - Environmental Measurements
Theory on the Propagation of UHF Radio Waves in Coal Mine Tunnels
Wireless Communications for Trackless Haulage Vehicles
Page last reviewed: March 29, 2018
Page last updated: March 29, 2018
Content source: National Institute for Occupational Safety and Health, Mining Program
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