Modeling and measurements for wireless communication networks in underground mine environments

Ranjan, Alok; Sahu, H. B.; Misra, Prasant

doi:10.1016/j.measurement.2019.106980

Cited by 27 publications

(17 citation statements)

References 29 publications

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“…According to (11), MAF mn increases with the value of m and n. When K 1 h 3 > 1 w 3 , the growth of MAF mn with n is faster than that with m. This condition is satisfactory for most mines, because most of the coal mine tunnels have a larger width than height. Therefore, the vertically polarized modes with less propagation loss in the near-field region are mainly the modes with a lower order of n, such as n = 1, 2, and 3.…”

Section: ) For Near-field Region Coveragementioning

confidence: 95%

“…The multimodal approach [11]-15] for rectangular tunnels is a very representative method used to simplify the solution of the EM field in tunnels with other transversal shapes, such as arched tunnels [16]- [19]. In a rectangular tunnel, set a Cartesian coordinate system with its origin located at the center of the tunnel.…”

Section: Methodology a Propagation Characteristics Of The Tunnelmentioning

confidence: 99%

“…x, y, and z axes are along the width, height, and length of the tunnel, respectively. With reference to the quantities listed in Table 1, the E, H field can be expressed as the superimposition of multiple horizontally/vertically polarized modes with indexes (m, n) [11], [14], [15]: where the restrictions of m and n are given by [20] 1 ≤ |m| ≤ m lim = 2w λ…”

Section: Methodology a Propagation Characteristics Of The Tunnelmentioning

confidence: 99%

“…Considering the contribution of multiple significant modes for the near-field propagation, the total coupled power P 0 of the antenna in one tunnel direction is [11]- [15], [21],…”

Section: ) For Near-field Region Coveragementioning

confidence: 99%

“…In this paper, a new deployment strategy was proposed based on multimode theory [11]- [15]. The field propagation characteristics in the near-field and far-field region of the source in underground mines were investigated, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Deployment of Antenna for Field Coverage in Coal Mine Tunnels

Huo

Zhao

et al. 2020

IEEE Access

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A deployment strategy for antennas is proposed to enhance the field coverage of wireless devices in underground coal mines, which uses the multimodal approach. Based on the attenuation coefficient of each mode, the propagation loss of the vertically polarized modes with n = 1, 2, and 3 and that of the horizontally polarized modes with m = 1, 2, and 3 are less. For the signal propagation in the near-field region of the source, these modes play significant role. According to the coupling of the antenna to the modes, the significant modes can be effectively excited by mounting horizontally polarized antenna on the ceiling or the vertically polarized antenna on the sidewall. For the signal propagation in the far-field region, the (1, 1) mode is significant, and the horizontally polarized excitation is preferred due to smaller attenuation. By comparing the total coupling efficiency of the antenna-radiated power, stronger excitation power can be obtained by mounting the antenna near the center of the ceiling or that of the sidewall. The field strength in the near-field and far-field region coverage can be maximized by optimizing the antenna polarization and position. For verification, a grid-based test system was designed and a series of measurements inside an underground coal mine tunnel were conducted. The measured results have a good agreement with the theoretical ones. In addition, the EM interference caused by the infrastructure in real mines on the signal received by the antennas at different positions was also measured and compared. Results show that the influences of cables with long-term stable loads, such as power cables and communication cables, can be neglected. INDEX TERMS Antenna deployment, field coverage, underground mines, wireless networks.

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Section: ) For Near-field Region Coveragementioning

confidence: 95%

Section: Methodology a Propagation Characteristics Of The Tunnelmentioning

confidence: 99%

Section: Methodology a Propagation Characteristics Of The Tunnelmentioning

confidence: 99%

“…Considering the contribution of multiple significant modes for the near-field propagation, the total coupled power P 0 of the antenna in one tunnel direction is [11]- [15], [21],…”

Section: ) For Near-field Region Coveragementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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