A Chipless RFID Sensor for Metal Crack Detection Based on Notch Characteristics

This paper proposes a sensor for structural health detection based on RFID technology, which integrates three RFID tags for identification and a circular patch antenna for detecting cracks. The simulation results show that the resonant frequency of the ID tag is only sensitive to vertical crack, while the resonant frequency of the circular patch antenna is sensitive to both vertical and transverse crack. Therefore, the resonance frequency offset of the CMPA and the tag can be used to detect the location and orientation of the metal crack.