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PROF LEVENT SEVGI – ELECTROMAGNETICS EDUCATION AND DIFFRACTION MODELING & SIMULATION

September 23 @ 9:00 am - 11:00 am

Lecture 1: From ENGINEERING ELECTROMAGNETICS to ELECTROMAGNETIC ENGINEERING: Teaching/Training Next Generations Abstract The role of Electromagnetic (EM) fields in our lives has been increasing. Communication, remote sensing, integrated command/ control/surveillance systems, intelligent transportation systems, medicine, environment, education, marketing, defense are only a few areas where EM fields have critical importance. We have witnessed the transformation from Engineering Electromagnetics to Electromagnetic Engineering for the last few decades after being surrounded by EM waves everywhere. Among many others, EM engineering deals with broad range of problems from antenna design to EM scattering, indoor–outdoor radiowave propagation to wireless communication, radar systems to integrated surveillance, subsurface imaging to novel materials, EM compatibility to nano-systems, electroacoustic devices to electro-optical systems, etc. The range of the devices we use in our daily life has extended from DC up to Terahertz frequencies. We have had both large-scale (kilometers-wide) and small-scale (nanometers) EM systems. Large portion of these systems are broadband and digital, and have to operate in close proximity that results in severe EM interference problems. Engineers have to take EM issues into account from the earliest possible design stages. This necessitates establishing an intelligent balance between strong mathematical background (theory), engineering experience (practice), and modeling and numerical computations (simulation). This keynote lecture aims at a broad-brush look at certain teaching / training challenges that confront wave-oriented EM engineering in the 21st century, in a complex computer and technology-driven world with rapidly shifting societal and technical priorities. The lecture also discusses modeling and simulation strategies pertaining to complex EM problems and supplies several user-friendly virtual tools, most of which have been presented in the IEEE AP Magazine and which are very effective in teaching and training in lectures such as EM Wave Theory, Antennas and Radiowave Propagation, EM Scattering and Diffraction, Guided Wave Theory, Microstrip Circuit Design, Radar Cross Section Prediction, Transmission Lines, Metamaterials, etc. References – Sevgi, Electromagnetic Modeling and Simulation, IEEE Press – John Wiley (EM Wave Series), NJ, Apr 2014. – Sevgi, Complex Electromagnetic Problems and Numerical Simulation Approaches, IEEE Press – John Wiley & Sons, May 2003. – Sevgi, A Practical Guide to EMC Engineering, ARTECH House, Norwood, MA, March 2017. – Apaydın, L. Sevgi, Radiowave Propagation and Parabolic Equation Modeling, IEEE Press – John Wiley, NJ, Sep 2017. – Apaydın, L. Sevgi, Electromagnetic Diffraction modeling and simulation with MATLAB, ARTECH House, Norwood, MA, Feb 2021. Lecture 2: ELECTROMAGNETIC DIFFRACTION MODELING & SIMULATION Abstract EM diffraction is critical in many applications, including antennas and propagation. Understanding and visualizing EM wave – object interaction is crucial in designing new antenna systems, in predicting path losses through complex propagation paths, etc. In order to do that wave pieces such as diffracted waves, Fringe waves, etc., should first be studied on canonical structures. Then, complex objects can be investigated by using HFA as well as numerical methods in hybrid form intelligently. EM wave scattering from waves – objects interaction has long been investigated. Interesting wave phenomena, diffraction, occur when objects have sharp edges and tips. Methods known as High Frequency Asymptotics, such as Geometric optics (GO), Physical Optics, (PO), Geometrical Theory of Diffraction, (GTD), Uniform Theory of Diffraction (UTD), Physical Theory of Diffraction (PTD) and Theory of Edge Diffraction (TED) have been successfully applied to variety of EM problems. Recently, numerical methods, such as Finite Difference time Domain (FDTD), Method of Moments (MoM) and Finite Element Method (FEM) have also been used in modeling EM diffraction. These powerful methods, together with novel approaches, have shown to be successful not only in modeling EM diffraction but also in distinguishing wave pieces such as scattered waves, diffracted waves, Fringe waves, etc., which is very important in visualizing and understanding complex wave – object interaction. This talk will review all these approaches, use recently developed EM virtual tools and present comparisons through canonical examples. References – L. Sevgi, Electromagnetic Modeling and Simulation, IEEE Press – John Wiley (EM Wave Series), NJ, Apr 2014. – L. Sevgi, Complex Electromagnetic Problems and Numerical Simulation Approaches, IEEE Press – John Wiley & Sons, May 2003. – G. Apaydın, L. Sevgi, Electromagnetic Diffraction modeling and simulation with MATLAB, ARTECH House, Norwood, MA, Feb 2021. – C. Balanis, L. Sevgi, P. Ya Ufimtsev, “Fifty Years of High Frequency Asymptotics,” RFMiCAE, International Journal on RF and Microwave Computer-Aided Engineering, 23 (4), Jul 2013, pp.394–402. – F. Hacıvelioğlu, L. Sevgi, P. Ya. Ufimtsev, “Electromagnetic Wave Scattering from a Wedge with Perfectly Reflecting Boundaries: Analysis of Asymptotic Techniques,” IEEE Antennas and Propagation Magazine, Vol. 53, No. 3, pp.232-253, Jun 2011. – F. Hacıvelioğlu, M. A. Uslu, L. Sevgi, “A Matlab-based Virtual Tool for the Electromagnetic Wave Scattering from a Perfectly Reflecting Wedge”, IEEE Antennas and Propagation Magazine, 53 (6), Dec 2011, pp.234–243. – G. Çakır, L. Sevgi, P. Ya. Ufimtsev, “FDTD Modeling of Electromagnetic Wave Scattering from a Wedge with Perfectly Reflecting Boundaries: Comparisons against Analytical Models and Calibration,” IEEE Trans. on Antennas and Propagat., 60 (7), Jul 2012, pp. 3336–3342. – M. A. Uslu, L. Sevgi, “Matlab-based Virtual Wedge Scattering Tool for the Comparison of High Frequency Asymptotics and FDTD Method”, ACES Journal, 27 (9), 2012, pp.697–705. – G. Apaydın, L. Sevgi, “Method of Moments (MoM) Modeling of Wave Propagation inside a Wedge Waveguide,” ACES Journal, 29 (8), 2014, pp.515–522. Speaker(s): Prof Levent Sevgi, Agenda: 9:00 am ~ 10:00 am: Lecture 1 – From ENGINEERING ELECTROMAGNETICS to ELECTROMAGNETIC ENGINEERING: Teaching/Training Next Generations; 10:00 am ~ 11:00 am: Lecture 2 – ELECTROMAGNETIC DIFFRACTION MODELING & SIMULATION; Room: 003, Bldg: A003, James Cook University, Cairns, Queensland, Australia, 4878, Virtual: https://events.vtools.ieee.org/m/322882

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