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Related Concept Videos

Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

115
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
115
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

77
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
77
Lossless Lines01:23

Lossless Lines

103
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
103
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

77
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
77
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

209
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
209
Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

29
The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
29

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Related Experiment Video

Updated: May 25, 2025

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Path Loss Modeling for RIS-Assisted Wireless Communication in Tunnel Scenarios.

Qi Yang1, Yating Wu1, Hengkai Zhao1

  • 1Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai 200444, China.

Sensors (Basel, Switzerland)
|February 26, 2025
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Reconfigurable intelligent surface (RIS) technology can extend wireless communication distances in tunnels. This study validates RIS performance in tunnels, showing its potential for rail transit engineering.

Keywords:
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Area of Science:

  • Wireless communication systems
  • Electromagnetics
  • Signal processing

Background:

  • Limited transmission distance is a key challenge for reconfigurable intelligent surface (RIS) technology.
  • Rail transit engineering requires robust wireless communication systems within tunnel environments.

Purpose of the Study:

  • To investigate the performance of RIS-assisted wireless communication systems in tunnel environments.
  • To develop and validate a path loss model for RIS in tunnels.
  • To assess the potential of RIS for enhancing signal transmission distance in rail transit.

Main Methods:

  • Utilized a tunnel simulation platform to model RIS-assisted wireless communication.
  • Derived a theoretical path loss model specifically for tunnel scenarios.
  • Validated the proposed model against simulation results.

Main Results:

  • The proposed path loss model accurately reflects RIS communication performance in tunnels.
  • Simulation results confirm RIS capability to enhance signal transmission distance within tunnels.
  • Demonstrated the effectiveness of RIS in overcoming distance limitations in tunnel environments.

Conclusions:

  • RIS technology shows significant potential for improving wireless communication in tunnels.
  • The developed path loss model provides a valuable tool for analyzing RIS performance in such environments.
  • RIS offers a promising solution for enhancing signal transmission in rail transit engineering applications.