Speaker: Mohammad Tayeb Al Qaseer, Research Associate Professor with the Electrical and Computer Engineering Department at Iowa State University
Title: Real-Time 3D Microwave and Millimeter Wave Imaging Systems
Abstract: Microwave and Millimeter-wave signals span the frequency range of 300MHz – 30 GHz and 30 GHz – 300 GHz respectively. Signals at these frequencies can easily penetrate inside dielectric materials and interact with their inner structures. At millimeter wave frequencies in particular, the relatively small wavelengths and wide bandwidths associated with these signals enable the production of 3D high resolution images of materials and structures. Raster scanning of a reflectometer, using mechanical 1D or 2D positioning system, has been an effective technique for producing high fidelity microwave and millimeter wave images. Ultimately, imaging techniques must produce high-resolution 3D images, become real-time, and be implemented using portable systems particularly for field deployment. To this end, the development of innovative antenna array based imaging systems and robust back-propagation algorithms have resulted in viable solutions in particular for security, nondestructive testing (NDT), and biomedical applications. An overview of microwave and millimeter wave real-time imaging systems designs will be presented, highlighting challenges and techniques to overcome them. These challenges include designing small and efficient wideband antennas, integrating antennas with the high frequency electronics, and satisfying spatial sampling requirements. Overcoming these limitations requires a holistic approach incorporating optimized hardware designs, novel measurement techniques, and image reconstruction algorithms.
Bio: Mohammad Tayeb Al Qaseer is a Research Associate Professor with the Electrical and Computer Engineering Department, Iowa State University. He received his B.S. in electrical engineering degree (Magna Cum laude) from the American University of Sharjah (AUS), Sharjah, UAE, in 2002 and his M.S. and PhD degrees in electrical engineering from Missouri University of Science and Technology (formerly University of Missouri-Rolla), MO, USA in 2004 and 2009.
His research interest is in the area of microwave and millimeter-wave instrumentation and measurement and its application for holographical measurement and 3D SAR imaging. His other interests include RF circuits, antennas, and numerical electromagnetic analysis, material evaluation, and nondestructive testing. He is the co-author of over 75 journal papers, and over 100 conference proceedings and presentations. He has 12 awarded patents in the areas of microwave and millimeter wave imaging and nondestructive testing.