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Multi-mode propagation on a medium frequency twin-lead transmission line with earth return.

Authors
Brocker-DE; Werner-PL; Werner-DH; Waynert-J; Li-J; Damiano-NW
Source
2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, July 7-13, 2013, Orlando, Florida. Piscataway, NJ: IEEE Antennas and Propagation Society (AP-S) and the U.S. National Committee of the International Union of Radio Science (USNC-URSI), 2013 Jul; :1936-1937
NIOSHTIC No.
20043216
Abstract
This work presents research in the development of medium frequency communications systems that the National Institute for Occupational Safety and Health (NIOSH) is performing in support of the 2006 MINER Act. In this work, a 280-m twin-lead (30-cm separation, 725-ohm) transmission line (TL) was constructed and used to measure complex input impedance and line currents resulting from open and shorted terminations at medium frequencies (MF). The line was placed in free space and positioned close to a lossy earth surface. This 3- conductor system (two wires and earth) was chosen to be a starting point to investigate the multimodal nature TLs may possess inside a coal mine. Although the TL was constructed to be physically isolated from the ground, measurements indicate the existence of common mode (CM) currents which are characteristic of a three-conductor system; hence, the ground affected the MF propagation characteristics. In this paper, fullwave computational models using moment methods are compared with the experimental measurements as a way to determine the origin of the CM currents. In the future, related experiments will be performed in underground mines in an effort to predict how multimodal MF signals will propagate in the presence of similar multiple-conductor systems.
Keywords
Mining-industry; Underground-mining; Radio-waves; Emergency-response; Models; Coal-mining; Analytical-processes
Publication Date
20130701
Document Type
Conference/Symposia Proceedings
Email Address
deb5223@psu.edu
Funding Type
Contract
Fiscal Year
2013
NTIS Accession No.
NTIS Price
ISBN No.
9781467353151
Identifying No.
Contract-200-2010-36317; M102013
ISSN
1522-3965
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, July 7-13, 2013, Orlando, Florida
State
PA; FL
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