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Abstract <p>In this paper, we propose a wireless strain sensor utilizing a spoof localized surface plasmon (SLSPs) resonant structure for strain measurement in both metallic and nonmetallic materials. The&#xa0;resonant element consists of a metal spiral structure (MSS) on a defected ground, which excites the SLSPs. This resonator is connected to linearly polarized, ultra-wideband, high-gain microstrip patch antennas to enable wireless extraction of strain information. A coupled metallic plate is incorporated in the SLSPs resonator to form a capacitive coupling, thereby completing the wireless strain sensor design. As the material under test (MUT) undergoes stress-induced strain, the separation between the sensor’s two plates changes, shifting the resonant frequency. Two log-periodic antennas are employed for wireless signal transmission and reception, allowing the strain magnitude to be determined from this frequency shift. Experimental results show that the proposed sensor can detect a minimum deformation of 0.01 mm, with a sensitivity up to 574.2 kHz/με, representing a substantial improvement over traditional near-field resonant strain sensors. The proposed sensor enables high-precision wireless monitoring of small strains in the MUT, offering a highly flexible and noninvasive approach for structural health sensing.</p>

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A Wireless Strain Sensor Based on Spoof Localized Surface Plasmon Resonator

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Fei Ding,
  • Hangyu Li,
  • Xiaoqing Yang

摘要

Abstract

In this paper, we propose a wireless strain sensor utilizing a spoof localized surface plasmon (SLSPs) resonant structure for strain measurement in both metallic and nonmetallic materials. The resonant element consists of a metal spiral structure (MSS) on a defected ground, which excites the SLSPs. This resonator is connected to linearly polarized, ultra-wideband, high-gain microstrip patch antennas to enable wireless extraction of strain information. A coupled metallic plate is incorporated in the SLSPs resonator to form a capacitive coupling, thereby completing the wireless strain sensor design. As the material under test (MUT) undergoes stress-induced strain, the separation between the sensor’s two plates changes, shifting the resonant frequency. Two log-periodic antennas are employed for wireless signal transmission and reception, allowing the strain magnitude to be determined from this frequency shift. Experimental results show that the proposed sensor can detect a minimum deformation of 0.01 mm, with a sensitivity up to 574.2 kHz/με, representing a substantial improvement over traditional near-field resonant strain sensors. The proposed sensor enables high-precision wireless monitoring of small strains in the MUT, offering a highly flexible and noninvasive approach for structural health sensing.