Inspec keywords: microstrip antennas; fatigue cracks; ink jet printing; crack detection; environmental factors; intelligent sensors; condition monitoring; structural engineering

Other keywords: fatigue crack monitoring; low-cost inkjet-printed patch antenna sensor; parallel resonant modes; nonlinear crack shape effect; passive low-cost inkjet-printed smart skin sensor; large engineering structures; antenna resonant modes; real-time monitoring; resonant frequency shifts; passive crack formation detection; structural health monitoring; perpendicular resonant modes; environmentally friendly smart skins; conformal smart skins

Subjects: General shapes and structures; Fracture mechanics and hardness (mechanical engineering); Environmental issues; Testing; Surface treatment and coating techniques; Inspection and quality control; Environmental factors; Inspection and quality control; Instrumentation; Single antennas; Intelligent sensors