Microwave Dual-Crack Sensor with a High Q-Factor Using the TE20 Resonance of a Complementary Split-Ring Resonator on a Substrate-Integrated Waveguideopen access
- Authors
- Kim, Yelim; Park, Eiyong; Salim, Ahmed; Kim, Junghyeon; Lim, Sungjoon
- Issue Date
- Mar-2023
- Publisher
- MDPI
- Keywords
- complementary split ring resonator; metamaterial-based sensor; quality factor; multi-crack detection; higher-mode substrate-integrated waveguide
- Citation
- MICROMACHINES, v.14, no.3
- Journal Title
- MICROMACHINES
- Volume
- 14
- Number
- 3
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/67623
- DOI
- 10.3390/mi14030578
- ISSN
- 2072-666X
2072-666X
- Abstract
- Microwave sensors have attracted interest as non-destructive metal crack detection (MCD) devices due to their low cost, simple fabrication, potential miniaturization, noncontact nature, and capability for remote detection. However, the development of multi-crack sensors of a suitable size and quality factor (Q-factor) remains a challenge. In the present study, we propose a multi-MCD sensor that combines a higher-mode substrate-integrated waveguide (SIW) and complementary split-ring resonators (CSRRs). In order to increase the Q-factor, the device is miniaturized; the MCD is facilitated; and two independent CSRRs are loaded onto the SIW, where the electromagnetic field is concentrated. The concentrated electromagnetic field of the SIW improves the Q-factor of the CSRRs, and each CSRR creates its own resonance and produces a miniaturizing effect by activating the sensor below the cut-off frequency of the SIW. The proposed multi-MCD sensor is numerically and experimentally demonstrated for cracks with different widths and depths. The fabricated sensor with a TE20-mode SIW and CSRRs is able to efficiently detect two sub-millimeter metal cracks simultaneously with a high Q-factor of 281.
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