Complementary Split Square Ring Resonator for Monitoring Surface Crack

The paper focuses on non-invasive crack detection in metallic surfaces using Complementary Split Square Ring Resonators (CSSRR). The sensor is designed to operate in the range of 2 to 3 GHz and is highly sensitive to changes in the electromagnetic environment. When cracks or damage occur in the metallic sheet, electromagnetic properties change. These changes can be detected by the sensor through variations in S-parameters, resonance frequency, and transmission characteristics. The size, width, and depth of the cracks significantly affect the metallic electromagnetic characteristics, which in turn influence the S21 parameter, enabling the detection and analysis of surface cracks. This study presents a non-invasive method for identifying surface cracks in metallic materials using Complementary Split Square Ring Resonators (CSSRR). The sensor operates between 2 to 3 GHz, exhibiting high sensitivity to electromagnetic field disturbances caused by structural defects. Variations in Sparameters, especially in resonance frequency and transmission magnitude, allow for precise detection of surface anomalies. The compact, cost-efficient sensor can be fabricated using PCB technology, offering a promising alternative to conventional nondestructive testing (NDT) methods