Lecture Series Archive

Radio Wave Propagation in Open and Obstructed Environments

Rod Sugiyama

Mr. Rod Sugiyama
Chief Operating Officer
Operant Solar, Santa Rosa, CA

Thu, 03/07/2019

Abstract - Radio frequency propagation is critically important in our modern society. In addition to commonly known wireless devices such as mobile phones and wireless LAN, Services such as Waze (GPS location services), medical applications such as MRI, communication for police and fire services rely on RF propagation to deliver the service at the highest quality level. Since these services use open air as the transmission media, there is a critical need to engineer not only the electronics of wireless devices and systems but application of the knowledge of RF propagation in the real world. Thus, engineers need to understand and mitigate the effects of various obstructions on the RF links to deliver the ultimate satisfaction to the end and intermediate users. With that in mind, this presentation introduces key concepts of radio wave propagation in free space and through various types of obstructions.

Mr. Rod Sugiyama has 25+ years of engineering management and with 14 years of R&D program leadership. He has crossfunctional expertise and experience in leading purchasing, manufacturing and design engineering teams to achieve best in class results. Rod utilized his skills and experience at Tektronix, Keithey Instruments and HP/Agilent/Keysight in all aspects/phases of programs: mechanical, software, test and electronic hardware development through production ramp. He has managed remote sites and organizations of 5-60 people. Rod has an AS in Electronic Technology from SRJC and a BSEE from Cal State University, Sacramento.

Advances Made in Electronic Devices Using Widebandgap Semiconductors

Srabanti Chowdhury

Dr. Srabanti Chowdhury
Associate Professor
EE Department, Stanford University, Palo Alto, CA

Thu, 02/21/2019

Abstract - We live in extremely exciting times, often identified as age of the fourth industrial revolution. With electrification at every level, we are witnessing the most significant transformation of transportation since the internal combustion engine. Renewable energy is now a reality. Robotics and autonomous vehicles are upon us. This new world needs new physical electronics solutions with new materials, devices and heterogeneous integration to drive these innovations to their full potential. Widebandgap (WBG) semiconductors present a pathway to enable much of these electronics with higher efficiency and newer functionalities. Semiconductor devices with higher power density have unprecedented value in both power and high frequency electronics. Reducing conversion losses helps minimizing consumption of limited resources; it simultaneously enables new compact solutions, the basis for offering increased power conversion performance at reduced system cost. GaN has also opened the door to other ultrawide bandgap materials such as Diamond, Aluminum Nitride and Gallium Oxide.

Dr. Srabanti Chowdhury is an Associate Prof. of EE at Stanford University and holds an adjunct faculty position at UC Davis. She received her M.S and PhD in EE UC Santa Barbara. She received the DARPA Young Faculty Award, NSF CAREER and AFOSR Young Investigator Program (YIP) in 2015. In 2016 she received the Young Scientist award at the International Symposium on Compound Semiconductors (ISCS). She serves as the member of two committees under IEEE Electron Device Society. She has served the IEEE International Devices Meeting (IEDM) technical sub committee Electron served the IEEE International Electron on Power Devices & Compound Semiconductor and High Speed Devices (PC) subcommittee in 2016 and 2017. She was the PC subcommittee chair for IEDM-2018, and continues to serve the IEDM executive committee for 2019. She is a senior member of IEEE.

Quantifying and Measuring Phase Noise in RF and Microwave Signals

Salam Marougi

Dr. Salam Marougi
Expert Engineer
Keysight Technologies, Santa Rosa, CA

Thu, 02/07/2019

Abstract - Over the past years, Phase Noise has become critical parameter for the performance of many systems ranging from cellular receivers, highspeed digital systems, and target detection and identification systems. Currently, Phase Noise is a very important design parameter for all top-of-the line signal generators and frequency synthesizers. In this seminar, Phase Noise will be defined and explained in simple terms. The various methods and concepts used to quantify Phase Noise in time and frequency domains will be defined and explained. The frequency domain approach in quantifying and measuring Phase Noise will be will be emphasized and explained in detail because it is the most accurate and repetitive approach for characterizing Phase Noise. Different practical methods used in measuring Phase Noise will be explained and compared. The design of commercially available test instruments is also explained and compared to understand merits and limitations.

Dr. Salem Marougi is with the Signal Sources Division of Keysight Technologies. He has over twenty-two years of experience working on various RF and Microwave assemblies and products. He started his career with Hewlett-Packard Company, then continued with Agilent Technologies and currently he is with Keysight Technologies. Before joining the Hi-Tech Industries, Dr. Marougi was University Professor at various Institutions. He also has taught for the University of California- Berkeley continuous education courses for over twelve years on topics related to Phase-Locked Loops and Phase Noise. He also has provided consultations and training to various Hi-Tech companies. Dr. Marougi has acquired extensive experience in the Test and Measurement Industries where he worked on various RF receivers, Modular Systems, Spectrum Analyzers, and Frequency Synthesizers. Currently, he is involved with Performance Signal Generators and Ultra-Fast Switching Signal Sources. Dr. Marougi holds an MS and a Ph.D. in Electronics and Electrical Engineering from the United Kingdom.

Metasurfaces: Engineering Electromagnetic Wavefronts

Mohamed Salem

Dr. Mohamed Salem
Assistant Professor
Engineering Science Department, Sonoma State University

Thu, 11/15/2018

Abstract - Metamaterials was once synonymous with ‘paradigm shift’ and ‘future technology’. In the first decade of the 21st century, metamaterials were sought to solve a large number of problems in microwaves and optics, and rapidly advance industrial, scientific, medical, and military technologies. Yet very few of the initial expectations have come to fruition. This lack of concrete applications led some critics to label metamaterials as an “unearned irony of the improperly educated postmodern crowd”. This talk sheds some light on the origin behind the initial enthusiasm and the followed disappointment in metamaterial research. The successor of bulk metamaterials, namely metasurfaces, is introduced and the underlying electromagnetic-metasurface interactions are analyzed. A detailed insight is given into metasurface engineering and several realizable applications. An overview of metasurface engineering future roadmap is laid out with pointers to some of the available exciting research and development opportunities.

Dr. Mohamed Salem is an Assistant Professor in the Department of Engineering Science at Sonoma State University. He received his Ph.D. from New Jersey Institute of Technology, Newark, NJ in2009. Prior to joining Sonoma State University, he was a lecturer with the University of Idaho, Moscow, ID. He has several years of postdoctoral experience with Polytechnique Montreal, Montreal, QC and King Abdullah University of Science and Technology (KAUST), Thuwwal, Saudi Arabia. Dr. Salem's research focuses on electromagnetic propagation and scattering phenomena and wave-matter interaction. He is particularly interested in metasurface application in wavefront shaping and unconventional waves and beams, such as localized waves.

Fundamentals and Trends in Photovoltaic Electric Generation

Paul Hernday

Mr. Paul Hernday
Senior Applications Engineer
Solmetric, Inc., Sebastopol, CA

Thu, 11/01/2018

Abstract - Over 250,000 Americans work in the solar industry, and last year the solar industry generated a $17 billion investment in the American economy. This talk explores the explosive growth of solar electric generation with focus on solar cell and PV system principals and operation, trends in PV system design, tools for designing and testing PV systems, and methods for monitoring the performance of installed systems and remotely diagnosing any performance issues. We will also look at the forces acting to increase and impede the growth of solar, and the wide diversity of job types found in the solar industry.

Mr. Paul Hernday is Performance Engineer at Vivint Solar, a nationwide residential solar energy company. His work includes using monitoring data from individual solar systems to characterize production, detect performance issues, and provide technical support to the service organization. Paul is also Senior Applications Engineer at Solmetric, a Sebastopol-based developer and manufacturer of innovative electronic measurement tools for the solar PV industry. At Solmetric he specializes in PV array performance measurement, supporting customers through one-on-one consulting, training courses, and technical articles. Solmetric is a wholly-owned subsidiary of Vivint Solar. Prior to entering the solar field Paul developed electronic measurement instruments with HP and Agilent Technologies and earned a degree in Organization Development from Sonoma State University.