Research on an Improved Metal Surface Defect Detection Sensor Based on a 3D RFID Tag Antenna

<div>3D patch bending dipole antenna model and equivalent circuit diagram. (a) 3D patch bending dipole antenna model. (b) Equivalent circuit diagram of the 3D patch bending dipole antenna.</div>

Journal of Sensors

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Figure 4

Figure 4: Research on an Improved Metal Surface Defect Detection Sensor Based on a 3D RFID Tag Antenna 