Yifei Li

Yifei Li, PhD


Electrical & Computer Engineering

Professor Yifei Li RF Photonics Lab




Science & Engineering 214E


2003Drexel UniversityPhD in Electrical Engineering
2001Drexel UniversityMS in Electrical Engineering
1996Hauzhong University, ChinaBS in Optoelectronics Engineering





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.

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.

Topics of timely interest in Electrical and Computer Engineering. Course content may change from year to year according to instructor's preferences.

Select publications

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.

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