Yifei Li, PhD
Electrical & Computer Engineering
Science & Engineering 214E
|2003||Drexel University||PhD in Electrical Engineering|
|2001||Drexel University||MS in Electrical Engineering|
|1996||Hauzhong University, China||BS in Optoelectronics Engineering|
- Computer Engineering BS, BS/MS
- Computer Engineering MS
- Cyber Security Concentration
- Electrical Engineering BS, BS/MS
- Electrical Engineering MS
- Electrical Engineering PhD
Fundamentals of time-invariant electric and magnetic fields and time-varying electromagnetic fields leading to general Maxwell's equations. Topics include the electromagnetic model, vector calculus, electrostatic fields, steady electric currents, magnetostatic fields, electromagnetic induction, slowly time-varying electromagnetic fields, and Maxwell's equations in integral and differential form; solutions of Maxwell's equations in the presence of boundary conditions are presented. Maxwell's equations in complex domain are introduced and utilized. Circuit theory and its relationship to electromagnetics is presented as an approximate form of Maxwell's equations. Numerical techniques for field computation are introduced.
Fundamentals of electromagnetic waves, propagation, and radiation as a continuation of ECE 335. The course reviews general Maxwell's equations in integral and differential form, and electromagnetic boundary conditions. Poynting's theorem and Lorentz potentials are studied. Topics include the propagation of uniform plane electromagnetic waves in free space and in various media (including wave reflection and refraction, and skin effect), transmission-line theory using frequency- and time-domain analysis, analysis of waveguides and electromagnetic resonators, and fundamentals of radiation and antennas. Numerical techniques for radiation and scattering are introduced. Two laboratory experiments on transmission lines and waveguides are performed.
Review of transmission line theory. The concept of impedance transformation is presented. The characteristics of coaxial lines, waveguides, and microstrip lines are studied in detail. Propagation and impedance properties of these lines are derived. Smith charts are used for designing matching and tuning circuits. The use of S-parameters and the analysis of multi-port networks are presented. Passive multi-port devices such as microwave power couplers and dividers are described. The fundamentals of microwave and RF filters and resonators are discussed, and their implementation using microstrip lines and waveguides is also presented.
Illustration of principles of advanced electronics and photonics by showing their applications in advanced radar, wired/wireless communications, and electronic sensing. Key electronics/photonics devices including high speed transistors, diodes, lasers, high frequency modulators, photodetectors, amplifiers, and passive circuitries are discussed. System applications including advanced radar system, radio over fiber, and millimeter wave /THz signal generation and processing are deliberated and analyzed.
Topics of timely interest in Electrical and Computer Engineering. Course content may change from year to year according to instructor's preferences.
Yoo, D. K.; Li, Y.; Goldwasser, S. M.; Jemison, W. D.; Herczfeld, P. R. (2008).
“Coupled Optoelectronic Oscillation via Fundamental Mode-Locking in a Composite-Cavity Electro-Optic Microchip Laser”
IEEE/OSA Journal of Lightwave Technology, 26, 824-831.
Li, Y.; Ding, G.H.; Herczfeld, P.R. (2008).
“Photonic phase-locked-loop linear phase demodulator”
Electronics Letters, 44, 375-376.
Li, Y.; Herczfeld P.; Rosen, A.; Bystrom, M.; Jemison, W. (2008).
“Optical down-conversion and digital processing of microwave signals”
Journal of European Microwave Association, 4, 226-235.
Dr. Yifei Li received his B.Eng. in Optoelectronics from Huazhong University of Science and Technology, China, in 1996. He received his MS (2001) and PhD (2003) in Electrical Engineering both from Drexel University, Philadelphia, PA. From 2003 to 2007, he was a research faculty with the Center for Microwave-Lightwave Engineering, Drexel University. In 2007, he joined the ECE Department of the University of Massachusetts Dartmouth, where he is currently a full professor and the director of the RF Photonics Lab. From 2013 to 2014, Dr. Li was a visiting faculty in the Optoelectronic Research Group of the University of California Santa Barbara. Dr. Li’s research interests includes RF photonics, photonic integrated circuits, coherent optical communications, RF devices and systems, and laser physics.
Dr. Li has five US patents in RF Photonics. He has numerous publications in renowned technical journals and international conference proceedings. Since he joined UMassD, he has led 8 competitive research projects funded from the Navy, Airforce and DARPA as the Principle investigator. Dr. Li was a winner of European Microwave Association (EuMA) Young Scientist Prize (1st prize) during the 12th Colloquium on Microwave Communications held in Budapest, Hungary. He was a winner of 2008 DARPA MTO Young Faculty Award.