Complementary metaresonators based X-band hollow waveguide filter and crack detection sensor

A new metamaterial based subwavelength resonators configuration for X-band hollow waveguides is proposed and its application as a filter and crack detection sensor is discussed. The structure is composed of a complementary rectangular split ring resonator embedding a T-type resonator. The filter has a 0.9 GHz bandwidth at 9.11 GHz resonance frequency. The comparison between a perfect surface and a defected surface is presented and observations are made using signal comparisons. Around the resonance frequency the signal comparison shows the difference in the reflection behavior for both the surfaces when the width and the depth of the crack are varied. The technique can be extended to study the material characteristics of different media.