EMC Experiments / Demonstrations
Elya Joffe:
Currents if not Obstructed will Always Flow in the Part of….
Abstract: Few
principles in EMC are confusing as much as those of "Grounding" and
"Shielding".
Indeed, misconceptions as to the mechanisms of those techniques have led to
many wrong concepts and implementations, which today are extremely difficult
to uproot: Is it better to use single point or multipoint grounding? In
Which frequencies? Is it better to ground a shield at both ends or at one
only? And how about the Signal circuits? How does return current flow on the
PCB - does it follow the shortest path?
The key to the answer to all those questions lies within the domain of a
concept called: "The Path of Least Inductance". That is the path that
current will follow at high frequencies (what is "high" for this purpose?)
This
lecture will discuss the very important concept of the "Path of Least
Inductance", and the application of this principle for providing answers to
the above questions and others.
Biography:
Mr. Joffe is employed by K.T.M. Project Engineering, an engineering
consulting company, in Israel since 1987. He currently holds a position of
the V.P. of Engineering and works as a Senior EMC engineering Specialist and
consultant.
Between 1981 and 1987, he was with the Engineering Division of the Israel Air Force (IAF), responsible for EMC and System Engineering of airborne systems and aircraft. His responsibilities included the EMC design of modern and upgraded military aircraft.
Mr. Joffe has over 25 years of experience in government and industry, in EMC/E3 (Electromagnetic Compatibility/Electromagnetic Environmental Effects) for electronic systems and platforms (in particular – aircraft and aerospace). He is actively involved, as an EMC/E3 Specialist, in the EMC design of commercial and defense systems, from circuits to full platforms. His work covers various fields in the discipline of EMC, such as NEMP and Lightning Protection design, as well as numerical modeling for solution of EMC Problems.
Mr. Joffe is well known in Israel and abroad for his activities in EMC training and education, and has authored, developed and presents many courses on Electromagnetic Compatibility and related topics. He has authored and co-authored over 30 papers in EMC and EMC-related topics, both in the IEEE Transactions on EMC and Broadcasting, as well as in the proceedings of International EMC Symposia.
Mr. Joffe is Senior Member of IEEE, a member of the IEEE EMC Society of the Board of Directors since the year 2000 and currently is the VP for member Services. He is also the Immediate Past Chairman of the Israel IEEE EMC Chapter and he serves as the Israel IEEE Section Industry Relation Officer (IRO). Mr. Joffe is a Member of the IEEE Standards Association, a member of the IEEE EMC Society Standards Development Committee (SDCom) and Chairman of the EMC-S Standards Advisory and Coordination Committee (SACCom). He is also Chairmen of WG 473 for revision of IEEE STD 473 (“IEEE Recommended Practice for an Electromagnetic Site Survey (10 kHz to 40 GHz)”).
He is a Registered Professional Engineer and a NARTE (US National Association of Radio and telecommunications Engineer) Certified EMC and ESD Control Engineer.
Mr. Joffe served as a “Distinguished Lecturer” of the IEEE EMC Society, for
the years 1999 through 2000.
Mr. Joffe received several awards from the IEEE and EMC Society for his
activities. In particular, he is a recipient of the prestigious “Lawrence G.
Cumming Award” (2002), the “Honorary Life Member Award” (2004), the IEEE EMC
Society “Technical; Achievement Award” (2004), the IEEE EMC Society
“Symposium Chair Award” (2004) and the IEEE “Third Millennium Medal”
“…in recognition and appreciation of valued services and outstanding
contributions”.
Antonio Šarolić:
Electromagnetic Field Measurement for Modulated RF Signals with Arbitrary Waveforms
Experiment demonstration: Since electric field probes are commonly calibrated with a single sine signal, they react differently to signals that are modulated with different modulations. This can lead to significant error when measuring such signals. This error is unknown if the incident signal waveform is unknown (common case) and if the probe response to modulated signals is unknown (even more common case). An experiment will be performed to demonstrate such an error. The setup consists of an arbitrarily modulated signal generator, average power meter, controlled EM environment (rectangular waveguide) and two different electric field probes. The average signal power is controlled and kept constant, while the probes measure the RMS field inside the waveguide. The measurement results will demonstrate discrepancy and measurement errors when measuring the same average signal power but with different probes and different modulations of incident signal.
Biography:
Dr.
Šarolić is Assistant Professor in Electrical Engineering at University of
Split, FESB, Department of Electronics. He was previously employed by
University of Zagreb, FER, Dept. of radiocommunications. His areas of
interest are electromagnetic measurements, bioeffects of EM fields,
electromagnetic compatibility (EMC) and radiocommunications.
He has been working on several research projects and has authored over 40
papers in previously named topics. Dr. Šarolić has also worked on numerous
technical expertises for EE companies. He is involved in standardization
process through various committees and working groups.
