A Master of Science Thesis in Electrical Engineering submitted by Mohammad Asefi entitled "Plannar Microwave Imaging System," submitted in May 2011. Available are both soft and hard copies of the thesis.
Microwave signals have shown a tremendous utility in a wide variety of applications. Due to their penetrative nature, one of the most exciting applications of all is utilization of microwave signals to see through dielectric structures. Among all, microwave non-destructive evaluation and inspection (NDE&I) of structures and materials is one of the most adopted techniques. Such techniques are primarily based on measuring coherent electric field distribution on the target being imaged. In this thesis, the design, fabrication and measurement of a novel microwave imaging system, "a microwave camera", is presented. The design is based on a 10 GHz transmitter using a horn Antenna, an array of microstrip receiver antennas and a novel switching network. The received data is followed by a fast down converter to baseband and a custom-designed data acquisition system and GUI. The system offers novelty in terms of operating frequencies, receiver antenna and accuracy of distinguishing between materials of various dielectric constants. The scanning and switching stage designed for this project is also new. iv A prototype for the proposed system was also built and used to image objects of different materials and dielectric characteristics. Using the obtained results, the performance of the system was then analyzed.