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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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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Related Experiment Video

Updated: Sep 13, 2025

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High-Power Coupled Wideband Low-Frequency Antenna Design for Enhanced Long-Range Loran-C Timing Synchronization.

Jingqi Wu1, Xueyun Wang2, Juncheng Liu2

  • 1State Key Laboratory of Information Photonics and Optical Communications, School of Physical Science and Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Sensors (Basel, Switzerland)
|July 30, 2025
PubMed
Summary

A new impedance matching (IM) antenna enables miniaturized Loran-C timing systems. This compact antenna significantly extends the operational range to over 100 meters, overcoming limitations of traditional designs.

Keywords:
broadbandlong-distance communicationsminiaturizationradiation enhancementtiming system

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Area of Science:

  • * Electrical Engineering
  • * Radio Navigation Systems

Background:

  • * Precise timing synchronization is critical for navigation and communication systems.
  • * Miniaturizing Loran-C infrastructure faces challenges with conventional antennas regarding radiation intensity and bandwidth.
  • * Existing compact loop antennas have limitations in performance and range for Loran-C applications.

Purpose of the Study:

  • * To develop a compact antenna solution for miniaturized Loran-C timing systems.
  • * To overcome the inherent quality factor (Q) limitations of conventional antennas.
  • * To enhance both radiation intensity and bandwidth for improved system performance.

Main Methods:

  • * Proposed a sub-cubic-meter impedance matching (IM) antenna design.
  • * Utilized a planar-transformer-based impedance matching network for 100 kHz operation.
  • * Incorporated a resonant coil structure at the receiver to boost sensitivity.

Main Results:

  • * Achieved a -20 dB bandwidth of 18 kHz and over 7-fold radiation enhancement.
  • * The miniaturized Loran-C system demonstrated an extended decoding range of >100 m.
  • * Outperformed conventional loop antennas, which are limited to ~30 m range.

Conclusions:

  • * The proposed IM antenna successfully miniaturizes Loran-C timing systems.
  • * The design breaks transmission distance limitations for compact antennas, achieving hundred-meter scale range.
  • * Presents a viable approach for developing compact, high-performance Loran-C systems.