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in concrete and resin-rich composites, to name a few. This work reviews recent advances in four major areas of microwave and millimetre-wave NDTE, namely materials characterization, surface crack detection, imaging and sensors. The techniques, principles and some of the applications in each of these areas are discussed. This article is part of the theme issue 'Advanced electromagnetic non-destructive evaluation and smart monitoring'.Fatigue life of materials or structures can be classified into three stages fatigue hardening or soft