Simple Chipless RFID Sensor for Metal Crack Detection Using Shot-Time Matrix Pencil Method

This paper presents the measurement for metal crack detection using a short-time matrix pencil method. The proposed simple chipless RFID sensor is designed based on a circular microstrip patch antenna (CMPA) resonator with two pairs of slots. An anechoic chamber is used for the measurement in order to absorb reflections from the other environment. The natural frequency of the chipless RFID tag was extracted by the short-time matrix pencil method (STMPM). The performance of STMPM used to detect cracks in metal was evaluated via measurements. The resonant frequencies of the tag were investigated. Measurement results show the potential of STMPM for metal crack detection.