Metal Crack Detection with Chipless RFID Sensor using Shot-Time Matrix Pencil Method

This paper presents an investigation of the metal crack with the chipless RFID tag. The main part of the tags is a circular microstrip patch antenna (CMPA) resonator. To indicate the bit ID of tags using the resonant frequencies, the slots were created within the CMPA resonator. A short-time matrix pencil method (STMPM) was used to extract poles of the chipless RFID tag from signal backscattering. The performance of metal crack detection using STMPM was evaluated via simulations. The resonant frequencies of the tag were investigated in order to detect the crack of the metal plate. The results showed a crack on the metal affects natural frequencies shift.