Eslam Nasr of Technical Research Center

Radio frequency power amplifiers (PAs) represent critical active components in modern wireless systems, responsible for signal amplification while directly determining transmitter efficiency, linearity, and spectral compliance. As 5G/6G, satellite communications, and radar systems demand higher data rates and wider bandwidths, conventional PA architectures face fundamental limitations in balancing high efficiency with strict linearity requirements under complex modulation schemes.
This dissertation research addresses the fundamental trade-off between efficiency and linearity in radio frequency power amplifiers for next-generation wireless systems.it introduces a comprehensive design framework to overcome this challenge through innovative circuit level and system level co-design techniques. This thesis develops innovative solutions that simultaneously optimize both performance metrics. 

The key innovations include: (1) Phase cancellation techniques that reduce IM3 distortion by 15 dB without PAE degradation, (2) Datasets-driven bias optimization algorithms that reduce design iterations, and (3) Hybrid architectures that integrate load modulation with optimized unequal power divider to enhance back-off efficiency.
The three prototypes fabricated in GaN technology demonstrate consistent performance across frequency bands, with measured results and simulation targets. These advances establish new design paradigms for power efficient, spectral pure amplification in 5G massive MIMO, LEO satellite telemetry, and future 6G systems.

Biography:

Eslam N. Mohamed received a B.Sc. degree in electrical engineering from the Radar Department at the Military Technical College, Cairo, Egypt, in 2012, and M.Sc. degree in nonlinearities in microwave circuits for high power applications from the Military Technical College, Cairo, Egypt, in 2019. He is currently pursuing a Ph.D. degree in the Electronic Engineering Department at Military Technical College, Cairo, Egypt.
He is currently employed as a Researcher at the Technical Research Center in Cairo, Egypt. His research interests include high-efficiency RF power amplifier architectures, linearization, MMIC power amplifier design, the design of the RF front-end of RADAR and communication systems, and electromagnetic compatibility measurements.

Email:

Address:Egypt

Ayman Eltager of MTC

The PhD. Committee Chair will address the Committee Comments and Recommendations and discuss any audience questions with the PhD candidate. Then announce the committee decision.

Biography:

Ayman M. El-Tager (Senior Member, IEEE) received the Ph.D. degree in electrical engineering from Carleton University, Ottawa, ON, Canada, in 2004. He is currently a Full Professor and Chair of the Department of Electronic Engineering at the Military Technical College (MTC), Cairo, Egypt. He is also the Founding Chair of the IEEE Microwave Theory and Technologies Society (MTT-S) Egypt Chapter and the Cofounding Director of the RF Circuits and Systems group and the Nano-Microelectronic Technology Center (NμTC), MTC, Egypt since 2005, where more than 20 grad students were awarded their master’s and Ph.D. Prof. El-Tager has over 30 years of experience in teaching, research, and academic leadership. He was a Postdoctoral Fellow at the ElectroScience Laboratory, The Ohio State University, Columbus, OH, USA, and has held research appointments in CRC, Canada, VTT, Finland, and Phillips, France. His research interests include RF and microwave circuits, high-efficiency power amplifiers, advanced packaging, energy harvesting, and reconfigurable RF systems for IoT and 5G/6G applications. He has authored or coauthored more than 50 peer-reviewed papers and led several nationally deployed R&D projects in RF front ends of advanced systems. He is a recipient of Egypt’s Order of the Republic and the Presidential Medal for Distinguished Service, and has received multiple Best Paper Awards from IEEE conferences and certificates of appreciation from IEEE MTT-S. He has served as General Chair or Co-Chair for several IEEE international conferences including IMAS and ICEENG. In addition, he served as an editor and reviewer for many highly ranked journals. ORCID ID:https://orcid.org/0009-0004-4030-7055

Email:

Address:MTC, , Cairo, Egypt, 11477

Mohammad Magdy Darwish of MTC

He will address the supervisor comments showing the advantage of the cooperation with Italian research facilities.

The MMIC prototype presented in this work has been realized within the framework of the “mmWave Multi-Project Runs for Selected Universities” agreement between the Italian Microwave Engineering Center for Space Applications (MECSA), Rome, Italy, and WIN Semiconductors, Taoyuan City, Taiwan.
This work was supported by the Italian Ministry of University and Research (MUR) through the PRIN 2022 Project under Grant 2022REST9A (Next Generation EU).

Biography:

MOHAMMAD DARWISH (Senior Member, IEEE) received the B.Sc. (Hons.) and M.Sc. degrees in electrical engineering from the Military Technical College, Cairo, Egypt, in 2001 and 2008, respectively, and the Ph.D. degree in electrical engineering from the University of California, Davis, CA, USA,in 2017. From 2017 to 2022, he was an Assistant Professor at the Radar Department, Military Technical College, where he worked on developing radar systems, RF front-end subsystems and high-power amplifiers. Currently, he is an Associate Professor and the Head of the Radar Department. In 2019, he was a Visiting Scholar at the School of Electronic Engineering, Xidian University, Xi’an, China. His research interests include RF and microwave hybrid and integrated circuits, especially power amplifiers, antennas, and radars. His research also focuses on transceiver architectures and RF Front-end performance enhancement for modern communication systems. Also, he researches new materials for electromagnetic shielding. ORCID ID:https://orcid.org/0000-0001-9214-4308

Email:

Address:Cairo, Egypt

AHMED M. ELELIMY ABOUNEMRA of MTC

Practical facilities and implementation issues is to be addressed showing the great advantages of the Nanoelectronics and Microwave Technology Center, MTC, Cairo, Egypt.

Microchip wire bonding, on wafer probing and measurements are to be represented and discussed with audience and the committee.

Biography:

AHMED M. ELELIMY ABOUNEMRA a (Member, IEEE) received the B.Sc. and M.Sc. degrees in electrical engineering from the Military Technical College, Cairo, Egypt, in 2005 and 2013, respectively, and the Ph.D. degree from the Intelligent RF Radio Laboratory, Department of Electrical and Software Engineering, University of Calgary, Calgary, AB, Canada, in 2020.
He is currently an Assistant Professor at the Department of Electronic Engineering, Military Technical College. His research interests include power efficiency enhancement for wireless transmitters, efficient and broadband power amplifiers, MMIC power amplifiers for wireless and satellite communications, MMIC broadband low-noise amplifiers, Doherty power amplifiers, and passive microwave circuits. Dr. Ahmed received the Research Productivity Award from the University of Calgary, the Best Paper Award from IEEE International Microwaves and Antennas Symposium 2023 (First Place), and the UCalgary Faculty of Graduate Studies Travel Grant. ORCID ID:https://orcid.org/0000-0002-7089-4674

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