This paper presents an antenna sensor that can detect and monitor crack remotely and passively. Since this antenna sensor does not need electric wires for power supply and data transmission, it has great potential to be implemented as large area sensor skin with high spatial resolution, simple configuration and remote-interrogation capability. The sensor fabrication, the sensor characterization procedure and the non-contact interrogation technique are presented. The experimental results demonstrated that the antenna sensor is sensitive to crack growth and can be interrogated remotely.

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