Complementary Split-ring Resonator as a High Sensitivity Sensor

Conference Paper
, Ali M. Albishi ; Omar M. Ramahi ; Muhammed S. Boybay . 2012
Conference Name: 
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation
Conference Location: 
Chicago, IL, USA
Conference Date: 
Sunday, July 8, 2012
Sponsoring Organization: 
IEEE
Publication Abstract: 

A new sensor based on complementary split-ring resonators (CSRR) is proposed. The sensor can detect sub-millimeter micro-surface cracks effectively. The crack perturbs the electromagnetic field around in the close vicinity of the CSRR gap, thereby causing a shift in the resonance frequency of the CSRR resonator. The sensor is etched-out in the ground plane of a microstrip-line using printed circuit board technology, thus making it significantly less expensive than crack detection sensors based on waveguides. The sensor presented here is designed to operate around 7 GHz. The sensor exhibits a frequency shift of more than 240 MHz for a 100 μm crack.