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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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Simulation and Measurement of Medium-Frequency Signals Coupling From a Line to a Loop Antenna.

Nicholas W Damiano¹, Jingcheng Li¹, Chenming Zhou¹

¹Office of Mine Safety and Health, National Institute for Occupational Safety and Health, Pittsburgh, PA 15236 USA.

IEEE Transactions on Industry Applications

|October 28, 2016

Summary

Researchers investigated medium-frequency (MF) radio wave propagation in underground mines. They measured MF coupling between transmission lines and loop antennas, finding key challenges for reliable mine communication systems.

Keywords:

Medium-frequency (MF) communications parasitic coupling transmission line (TL)

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Area of Science:

Electrical Engineering
Mining Engineering
Radio Science

Background:

Underground mining environments significantly impact radio-signal propagation, crucial for operational and emergency communications.
Medium-frequency (MF) radio is utilized in specific mining communication systems, necessitating an understanding of its behavior.
The National Institute for Occupational Safety and Health (NIOSH) conducts research to improve mine safety, including communication technologies.

Purpose of the Study:

To investigate medium-frequency (MF) coupling between transmission lines (TLs) and loop antennas in underground coal mine environments.
To present simulation and measurement results of MF radio propagation characteristics relevant to mine safety.
To identify and discuss challenges associated with MF TLs in underground mines.

Main Methods:

Conducted simulations and physical measurements of MF coupling in an experimental underground coal mine and a surface test area.
Performed two types of measurements: line-current distribution and line-to-antenna coupling.
Characterized current distribution along TLs and voltage induced in loop antennas.

Main Results:

Detailed current distribution along transmission lines (TLs) was measured and simulated.
Voltage induced in loop antennas from transmission lines was quantified.
Identified critical issues for MF TLs, including electromagnetic fields, end connections, and environmental proximity.

Conclusions:

The study provides valuable insights into MF radio propagation challenges in underground mines.
Results offer practical examples of underground communication difficulties for mine operators.
A method for measuring line-induced voltage is presented, aiding in the evaluation of mine communication systems.