Microwave Nondestructive Testing of Conductive Materials Using Sensor Tuned with Negative Permeability and Permittivity Structure

Microwave nondestructive testing methods become nowadays ever more exploited electromagnetic evaluation method not only dielectric but also metal materials surface and volume homogeneity. A novel microwave sensor created from open waveguide with metamaterial structure for non-destructive testing was developed in an attempt to increase the sensitivity of the microwave nondestructive evaluation method for detection of defects in metal and dielectric materials. In the paper we describe the new appr oach with implementation of metamaterial structure with negative permittivity and negative permeability over the open waveguide sensor in order to increase the gain and achieve the optimal radiation pattern of designed waveguide sensor with metamaterial st ructure in microwave X-band.