Embedded Object Detection by Using Planar Antenna Measurement System

In this study, planar near-fleld antenna measurement system has been used as a controlled radar setup and bistatic wave scattering conditions have been formed. A metal having 1cm £ 5cm dimensions has been buried in a non-conductive cylinder having a diameter of 5cm and height of 10cm. Then, electromagnetic scattering pattern of cylinder has been obtained by using S21 parameter. Using some image processing techniques on obtained pattern, detection of the metal buried in cylinder has been realized. The detection of buried objects in other mediums is important since there are many related appli- cations such as security, military, and medical applications. This issue force scientists to conduct researches on similar issues (1{3). Marr etal. (1) investigated the scattering characteristic of the metallic sphere by using cylindrical near fleld scanning system. They investigated the radar cross section and pattern of the sphere by putting it in the center of the scanner They compared numerical solutions with far fleld data computed from measured near fleld. Amineh etal. (2) investigated the capabilities and limits of the horn antennas flrst and then they proposed a microwave imaging setup by using planar aperture raster scanning. They used blind de-convolution algorithm and tested the performance of their technique. Burkholder etal. (3) used model-based imaging method instead of conventional imaging ap- proaches and they investigated the detection of objects inside a room. Since the topic has many applications, it is important to develop an e-cient technique. In this study, buried metal detection has been realized by using a planar near fleld antenna measurement system, which is mainly used for measuring and testing antennas, as a bistatic radar setup. Also, image processing techniques have been used.