Antennas and Propagation Society – 1:30PM, Friday, October 22
Antennas, Arrays & Calibration: Beam Forming and Beam Steering
Speaker: Prof. Dr. Levent Sevgi – IEEE APS Distinguished Lecturer – IEEE Fellow
Location: U-Mass Lowell, Southwick 240
The antenna is an electromagnetic (EM) radiator that emits radio frequency power. In other words, it is a transducer that converts voltage [V] to the electric field [V/m] (or vice versa). This IEEE AP-S DL talk will focus on electromagnetic radiators, antennas, antenna arrays and calibration. First, antenna as a transducer will be discussed and its circuit and electromagnetic models will be reviewed. Fundamental antenna terms and concepts will be summarized. Then, differences between communication and EMC antennas will be given. Finally, antenna calibration will be explained. In the second part, formation of antenna arrays will be presented and their beam forming and beam steering capabilities will be shown via a simple, MATLAB-based ARRAY virtual tool. Any 2D array (i.e., linear, planar, circular, etc.) may be designed by the user and its 2D and 3D radiation characteristics can be investigated using this tool. Beam forming capabilities for different locations, number of radiators, as well as for operating frequencies can be visualized. The package may be used as an educational tool in many undergraduate antenna lectures. It may also be used to validate and verify the finite-difference time-domain (FDTD) and method of moments (MoM) packages in public domain or, for example, the ones supplied in . Moreover, the user may improve package and add novel features by using the supplied source codes.
Prof. Dr. Levent Sevgi is a Fellow of the IEEE. He received his B. Eng., M. Eng., and PhD degrees in Electronic Engineering from Istanbul Technical University (ITU) in 1982, 1984 and 1990, respectively. In 1987, while working on his PhD, he was awarded a fellowship that allowed him to work with Prof. L. B. Felsen at Weber Research Institute / New York Polytechnic University York for two years. His work at the Polytechnic concerned the propagation phenomena in non-homogeneous open and closed waveguides.
He was with Istanbul Technical University (1991–1998), TUBITAK-MRC, Information Technologies Research Institute (1999–2000), Weber Research Institute / NY Polytechnic University (1988–1990), Scientific Research Group of Raytheon Systems Canada (1998 – 1999), Center for Defense Studies, ITUV-SAM (1993 –1998 and 2000–2002) and with University of Massachusetts, Lowell (UML) MA/USA as a full-time faculty (2012 – 2013) and with DOGUS University (2001-2014). Since Sep 2014, he has been with Istanbul OKAN University.
He has been an IEEE AP-S Distinguished Lecturer for the term 2020-2022. He served one-term in the IEEE AP-S AdCom (2013-2015) and one-term and as a member of IEEE AP-S Field Award Committee (2018-2019). He has been the writer/editor of the “Testing ourselves” Column in the IEEE AP Magazine (since Feb 2007), a member of the IEEE AP-S Education Committee (since 2006), He has also served in several editorial boards (EB) of other prestigious journals / magazines, such as the IEEE AP Magazine (since 2007), Wiley’s International Journal of RFMiCAE (2002-2018), and the IEEE Access (2017-2019 and 2020 – 2022). He is the founding chair of the EMC TURKIYE International Conferences (www.emcturkiye.org).
He has been involved with complex electromagnetic problems and complex communication and radar systems for nearly three decades. His research study has focused on propagation in complex environments; electromagnetic scattering and diffraction; RCS prediction and reduction; EMC/EMI modelling, simulation, tests and measurements; multi-sensor integrated wide area surveillance systems; surface wave HF radars; analytical and numerical methods in electromagnetics; FDTD, TLM, FEM, SSPE, and MoM techniques and their applications; bio-electromagnetics. He is also interested in novel approaches in engineering education, teaching electromagnetics via virtual tools. He also teaches popular science lectures such as Science, Technology and Society.
He has given dozens of seminars, invited/keynote talks, organized/presented several tutorials, training sessions and short courses from half-day to three-days in universities/institutes all around the World. He has published more than a dozen special issues / sections in many journals as a guest editor and/or a co-guest editor.
His recent keynote talks are: (i) From Engineering Electromagnetics towards Electromagnetic Engineering: Teaching, Training Next Generations in MMS’2018 Mediterranean Microwave Symposium, Istanbul / Turkey, and in EuCAP 2019 European Conference on Antennas and Propagation, Krakow / Poland, (ii) Radiowave Propagation Modeling and Simulation in APCAP 2019 Asia-Pasific Conference on Antennas and Propagation, Incheon / S. Korea, and (iii) From Design to Market: EMC Engineering in InCAP 2018 Indian Conference on Antennas and Propagation, Hyderabad / India.
He has published many books/book chapters in English and Turkish, over 180 journal/magazine papers/tutorials and attended nearly 100 international conferences/symposiums. His three books Complex Electromagnetic Problems and Numerical Simulation Approaches, Electromagnetic Modeling and Simulation and Radiowave Propagation and Parabolic Equation Modeling were published by the IEEE Press – WILEY in 2003, 2014, and 2017, respectively. His fourth and fifth books, A Practical Guide to EMC Engineering (Sep 2017) and Diffraction Modeling and Simulation with MATLAB (Feb 2021) were published by ARTECH HOUSE.
His h-index is 35, with a record of more than 4100 citations (source: Google Scholar, July 2021).
- Sevgi, Electromagnetic Modeling and Simulation, IEEE Press – John Wiley (EM Wave Series), NJ, April 2014.
- Sevgi, Complex Electromagnetic Problems and Numerical Simulation Approaches, IEEE Press – John Wiley & Sons, May 2003.
- Sevgi, Ç. Uluışık, “A Matlab-based Visualization Package for Planar Arrays of Isotropic Radiators,” IEEE Antennas and Propagation Magazine, 47, 1, pp. 156-163, Feb 2005.
- Sevgi, “The Antenna as a Transducer: Simple Circuit and Electromagnetic Models,” IEEE Antennas and Propagation Magazine, 49, 6, pp.211-218, Dec 2007
- Sevgi, S. Çakır, G. Çakır, “Antenna Calibration for EMC Tests and Measurements,” IEEE Antennas and Propagation Magazine, 50, 3, pp.215-224, Jun 2008
- Eser, L. Sevgi, “Open Area Test Site (OATS) Calibration,” IEEE Antennas and Propagation Magazine, 52, 3, pp.204-212, Jun 2010.
- Çakır, R. Hamid, L. Sevgi, “Loop Antenna Calibration,” IEEE Antennas and Propagation Magazine, 53, 4, pp:243-254, Oct 2011.