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<p>This paper presents a novel circularly polarized microstrip antenna system for non-invasive detection of moisture in wood, enabling early identification of arthropod infestation areas before structural damage occurs. The proposed system consists of two microstrip antennas with opposite polarization directions (LHCP/RHCP) for transmission and reception. The circular polarization direction difference between the transmitter and the receiver allows long distance measurement and ensures low coupling between the antennas; thus, high isolation is maintained when no moisture is present. Moisture presence alters this condition, increasing the received power by 12.5 dB. The antenna system is fabricated on a low-cost FR4 substrate with compact dimensions of 50&#xa0;mm × 50&#xa0;mm × 1.6&#xa0;mm and operates at 2&#xa0;GHz. Comprehensive simulations and experiments demonstrate reliable operation across multiple conditions, including moisture levels (0–100%), temperature (− 20&#xa0;°C to 90&#xa0;°C), antenna positioning, wood type (Pine, Douglas fir, and Oak), sample thickness (20–30&#xa0;mm), and subsurface moisture depth (up to 20&#xa0;mm). A prototype was then fabricated, and experimental repeated measurements confirmed high repeatability, with a standard deviation <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\approx\:\)</EquationSource> </InlineEquation> 0.7 dB. Calibration analysis yields an average sensitivity of 0.109 dB/%MC. These results indicate that the proposed system is suitable for wood-protective moisture-sensing applications.</p>

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Non-invasive wood moisture sensing for arthropod infestation prevention using a circularly polarized high-isolation antenna system

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月23日

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  • Abdelkarim S. Elhenawy,
  • Ahmed Allam,
  • Haruichi Kanaya,
  • Adel B. Abdel-Rahman

摘要

This paper presents a novel circularly polarized microstrip antenna system for non-invasive detection of moisture in wood, enabling early identification of arthropod infestation areas before structural damage occurs. The proposed system consists of two microstrip antennas with opposite polarization directions (LHCP/RHCP) for transmission and reception. The circular polarization direction difference between the transmitter and the receiver allows long distance measurement and ensures low coupling between the antennas; thus, high isolation is maintained when no moisture is present. Moisture presence alters this condition, increasing the received power by 12.5 dB. The antenna system is fabricated on a low-cost FR4 substrate with compact dimensions of 50 mm × 50 mm × 1.6 mm and operates at 2 GHz. Comprehensive simulations and experiments demonstrate reliable operation across multiple conditions, including moisture levels (0–100%), temperature (− 20 °C to 90 °C), antenna positioning, wood type (Pine, Douglas fir, and Oak), sample thickness (20–30 mm), and subsurface moisture depth (up to 20 mm). A prototype was then fabricated, and experimental repeated measurements confirmed high repeatability, with a standard deviation \(\:\approx\:\) 0.7 dB. Calibration analysis yields an average sensitivity of 0.109 dB/%MC. These results indicate that the proposed system is suitable for wood-protective moisture-sensing applications.