Metal crack detection device and method based on slow wave structure of open resonator

The invention relates to a metal crack detection device and method based on an open resonator slow wave structure, the device comprises a dielectric substrate, a microstrip transmission line and a resonance unit group, the resonance unit group comprises a plurality of resonance units which are periodically interwoven and distributed on two sides of a middle axis of the dielectric substrate; the resonance unit group is used for exciting self resonance through a plurality of resonance units in a coupling mode and generating a uniform magnetic field of a slow wave structure so as to generate a transmission band. According to the metal crack detection device, the cover area of the metal crack detection device can be adjusted according to requirements through the plurality of resonance units which are periodically distributed on the two sides of the middle axis of the dielectric substrate in an interlaced mode, and metal crack detection in a large range can be achieved; in the electromagnetic wave transmission pro