Creating and sharing knowledge for telecommunications

Meeting the challenges of RF with mmWave for 5G

on 30-10-2018

... Rafael Caldeirinha, researcher from IT in Leiria and a Coordinator Professor in the Polytechnic Institute of Leiria (IPLeiria)

Date & time: Tuesday, October 30th, 18:00h


Millimeter wave (mmWave) frequencies in combination with small Radio Frequency (RF) coverage look to be key technologies for 5G networks. However, mmWave spectrum comes with high path losses and the solution of small RF coverage to reduce signal congestion suffers from distortions of the transmitted signals. This webinar will look at how measurements of RF front ends designed for mmWave can help address whether commercial-off-the-shelf chip-based RF front end technology is ready to be used for 5G networks.


Rafael F. S. Caldeirinha (Fellow Member IET and Senior Member IEEE) received the BEng (Hons) degree in Electronic and Communication Engineering from the University of Glamorgan, UK, in 1997. In 2001, he was awarded a Ph.D in Radiowave Propagation by the same University for his research work in vegetation studies at frequencies from 1 to 62.4 GHz. He is currently Head of the Antennas & Propagation (A&P-Lr) research group at Instituto de Telecomunicações, Leiria, Portugal, and Coordinator Professor in Mobile Communications at the School of Technology and Management (ESTG) of the Polytechnic Institute of Leiria (IPLeiria), Portugal.
His research interests include studies of radiowave propagation through vegetation media, radio channel sounding and modeling and frequency selective surfaces, for applications at microwave and millimetre wave frequencies.

Prof. Caldeirinha has authored or co-authored more than 120 papers in conferences and international journals and 4 contributions to ITU-R Study Group, which formed the basis of the ITU-R P.833-5 (2005) recommendation. He is Associate Editor of the IEEE Transactions on Antennas and Propagation journal; Associate Editor of the IET on Microwaves, Antennas and Propagation journal; Member of the editorial board of the International Journal of Communication Systems, IJCS (New York, Wiley); Program chair of WINSYS International Conference between 2006 and 2012; Appointed Officer for Awards and Recognitions of the IEEE Portugal section in 2014; Chair of the IEEE Portugal Joint Chapter on Antennas & Propagation - Electron Devices - Microwave Theory & Techniques since 2016; Regional Delegate of European Association for Antennas and Propagation (EurAAP) for Andorra, Portugal and Spain since March, 2017; and a Senior Member of IEEE and Fellow Member of IET.

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Multistatic 3D Whole Body Millimeter-Wave Imaging for Explosives Detection

on 24-09-2018

... Prof. Carey Rappaport, from the Northeastern University, Boston, Massachusetts, USA

Date & time: Tuesday, October 9th, 11:00h
Location: Polytechnic Intitute of Leiria, B-Block, Auditorium 2

A whole-body imaging system for concealed object detection using multistatic mm-wave radar is presented. Horizontal multistatic sensing is facilitated using a patented “blade beam” transmitting reflector antenna and a quarter-circle arc array of receivers. The blade beam reflector combines parabolic curvature in the horizontal plane with elliptical curvature in the vertical plane to focus to a narrow horizontal slice on the object to be imaged. With only this slice illuminated, the scattered field will be due to just this narrow portion of the object, allowing for computationally simple inversion of a one dimensional contour rather than an entire two-dimensional surface. Stacking the reconstructed contours for various horizontal positions provides the full object image. 3D high resolution images are generated using a two-step process. Initially, an inverse source-based Fast Multipole Method (iFMM) provides a first approximation to the true human torso. Afterwards, the retrieved geometry is refined using the Iterative Field Matrix (IFM) technique. Assuming smooth variations of the human body profile, the object detection is performed by comparing the retrieved surface with a smoothed one. Results are based on Physical Optics simulations of the human body, considering both cases with and without objects.

Prof. Carey M. Rappaport is a Fellow of the IEEE, and he received five degrees from the Massachusetts Institute of Technology (MIT): the S.B. degree in mathematics and the S.B., S.M., and E.E. degrees in electrical engineering in 1982, and the Ph.D. degree in electrical engineering in 1987. Prof. Rappaport has worked as a teaching and research assistant at MIT from 1981 to 1987 and during the summers at Communications Satellite Corporation Laboratories in Clarksburg, Maryland, and The Aerospace Corporation in El Segundo, California. He joined the faculty at Northeastern University in Boston, Massachusetts, in 1987 and has been a professor of electrical and computer engineering since July 2000. In 2011, he was appointed College of Engineering Distinguished Professor. During the fall in 1995, he was a visiting professor of electrical engineering at the Electromagnetics Institute of the Technical University of Denmark, Lyngby, as part of the W. Fulbright International Scholar Program. During the second half of 2005, he was a visiting research scientist at the Commonwealth Scientific Industrial and Research Organization in Epping, Australia.

He has consulted for CACI; Alion Science and Technology, Inc.; GeoCenters, Inc.; PPG, Inc.; and several municipalities on wave propagation and modeling, and microwave heating and safety. He was a principal investigator for the Army Research Office-sponsored Multidisciplinary University Research Initiative on Humanitarian Demining, a co-principal investigator for the National Science Foundation-sponsored Engineering Research Center for Subsurface Sensing and Imaging Systems, and a co-principal investigator and deputy director for the Department of Homeland Security-sponsored Awareness and Localization of Explosive Related Threats Center of Excellence.

Prof. Rappaport has authored more than 400 technical journal articles and conference papers in the areas of microwave antenna design, electromagnetic wave propagation and scattering computation, and bioelectromagnetics, and he has received two reflector antenna patents, two biomedical device patents, and four subsurface sensing device patents. As a student, he was awarded the AP-S’s H.A. Wheeler Award for best applications paper in 1986. He is a member of the Sigma Xi and Eta Kappa Nu professional honorary societies. More Information..