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Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Lossless Lines

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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,...
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Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
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Related Experiment Video

Updated: Jun 25, 2025

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Ultra-Wideband Vertical Transition in Coplanar Stripline for Ultra-High-Speed Digital Interfaces.

Mun-Ju Kim1, Jung-Seok Lee1, Byung-Cheol Min1

  • 1School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea.

Sensors (Basel, Switzerland)
|May 25, 2024
PubMed
Summary

A new coplanar stripline (CPS) vertical transition design overcomes limitations of conventional differential line (DL) via structures. This enables ultra-high-speed digital interfaces for 6G communications with significantly improved bandwidth.

Keywords:
conformal mappingcoplanar striplineultra-high-speed interfaceultra-widebandvertical transition

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • High-Frequency Circuits

Background:

  • Conventional differential line (DL) via structures face performance limitations below 10 GHz.
  • Issues include impedance instability, signal skew, and electromagnetic interference, hindering ultra-high-speed data transmission.
  • These limitations are critical for emerging 6G communication standards.

Purpose of the Study:

  • To propose a novel design method for an ultra-wideband (UWB) vertical transition.
  • To enable ultra-high-speed digital interfaces by overcoming the drawbacks of traditional DL via structures.
  • To facilitate the design and fabrication of a coplanar stripline (CPS)-based vertical transition.

Main Methods:

  • Utilizing coplanar stripline (CPS) for vertical transitions, offering a balanced line (BL) solution.
  • Developing analytical design formulas based on the conformal mapping method for simplified transition design.
  • Employing electromagnetic (EM) simulations to validate characteristic line impedance calculations.

Main Results:

  • The proposed DL-to-CPS transition effectively mitigates inherent issues of DL structures.
  • Designed and fabricated CPS-based vertical transition maintains a 100 Ω characteristic impedance.
  • Achieved ultra-wideband performance with insertion loss < 1.6 dB and return loss > 10 dB from DC to 30 GHz.

Conclusions:

  • The CPS-based vertical transition demonstrates significantly wider bandwidth (>3x) compared to conventional DL via structures.
  • This design enables reliable ultra-high-speed digital data transmission essential for future communication systems.
  • The analytical design approach simplifies the realization of high-performance interconnects.