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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Related Experiment Video

Updated: Dec 19, 2025

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Design of a Miniaturized Rectangular Multiturn Loop Antenna for Shielding Effectiveness Measurement.

Sangwoon Youn1, Tae Heung Lim1, Eunjung Kang1

  • 1School of Electronic and Electrical Engineering, Hongik University, 04066 Seoul, Korea.

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|June 7, 2020
PubMed
Summary

A new miniaturized loop antenna sensor using ferrite was developed for VLF-HF bands. It shows promise for measuring shielding effectiveness in small enclosures.

Keywords:
AF enhancementSE measurementVLF antenna miniaturizationferrite loop antennamultiturn loop antenna

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Area of Science:

  • Electromagnetics and Antenna Engineering
  • Sensor Technology
  • Materials Science (Ferrite)

Background:

  • Development of compact antenna sensors for electromagnetic measurements.
  • Need for accurate characterization of shielding effectiveness in small enclosures.
  • Exploration of ferrite materials for enhanced antenna performance.

Discussion:

  • The proposed miniaturized rectangular loop antenna sensor integrates a multiturn wire with a cuboid ferrite core.
  • Fabrication and testing confirm its feasibility across very low frequency (VLF) to high-frequency (HF) bands.
  • Antenna factor (AF) measurements demonstrate significant performance, with values around 31.8-33.1 dB at 30 kHz.

Key Insights:

  • The antenna sensor achieved measurable antenna factor levels, validating its design for VLF-HF applications.
  • Successful application in shielding effectiveness (SE) measurements of a commercial cabinet highlights its practical utility.
  • Observed SE values of 4.1 dB (horizontal) and 12 dB (vertical) polarization indicate its capability for characterizing small enclosures.

Outlook:

  • Further optimization of the antenna sensor design for broader frequency ranges and improved sensitivity.
  • Exploration of its application in diverse electromagnetic compatibility (EMC) testing scenarios.
  • Potential for integration into portable or embedded measurement systems for real-time monitoring.