Professor Emeritus John Roy Whinnery, former dean of engineering at the University of California, Berkeley, and a distinguished innovator in the field of electromagnetism and communication electronics has died at the age of 92. Whinnery’s earliest work focused on understanding discontinuities in electromagnetic wave devices. His research led to innovations in microwave … [Read more...]
Certification Programs: What’s Behind the Terminology?
A well-defined and structured certification program is vital to assuring product quality and safety Randy Ivans, Underwriters Laboratories Inc. Melville, NY The Merriam-Webster® Dictionary defines “certify” as “to attest authoritatively, to confirm, to present in a formal communication, or to attest as being true.” Consider the implications of these words and phrases—confirm, … [Read more...]
Achieving More Accurate Measurement of Conducted RF Emissions Using Modified AMNs
Measurement uncertainty for common-mode disturbances can be reduced from about 22 dB to a maximum of a few dB Mart Coenen, Philips Applied Technologies Eindhoven, the Netherlands Introduction In early 1980, extensive discussions were held within the IEC CISPR/A working group regarding the definition of the impedance characteristics and the RF emission limits attained via the … [Read more...]
Lithium-zinc Ferrite for the Suppression of Electromagnetic Noise
Studies show that Li-Zn ferrites can successfully suppress EMI N.C. Joshi, S.S. Islam, Ph.D., Jamia Islamia University Jamia Nagar Anjali Verma, Ph.D., Indian Institute of Technology New Delhi, India Recent technological development has been characterized by an unprecedented proliferation of digital technology in information and communications equipment. The worldwide … [Read more...]
Building a State-of-the-Art 5-Meter Chamber
An efficient shield room for automotive testing progresses from design to finished structure Michael Koffink, Bob Mitchell Intertek ETL Semko Littleton, MA Four years ago, we noticed a growing demand for EMC testing from the automotive industry. As cars and trucks now feature myriad on-board electronic devices, they are increasingly susceptible to stray emissions while … [Read more...]
Reverberation Chamber for EMC Testing
The reverberation chamber provides the most realistic simulation/equivalency for electronics functioning within a cavity Er-Ping Li, Ph.D.; Xing-Chang Wei, Ph.D., Electromagnetic Labs, Singapore National Institute of High Performance Computing Singapore Introduction The problem is familiar, but growing. The widespread and ever-growing use of electronic devices with high-speed … [Read more...]
Understanding Inductance in the Real-world
As soon as current flows through metal conductors, inductance exists Bruce Archambeault, Ph.D., IBM Distinguished Engineer, IBM, Research Triangle Park, NC The concept of inductance is one of the most misunderstood concepts in electrical engineering. Terms such as ‘self inductance’, ‘loop inductance’, ‘partial inductance’, ‘mutual inductance’ are used with little concern … [Read more...]
Expanded Amplifier Line Delivers Reliable Performance in Demanding Environments
Five new broadband power amplifiers from Teseq operate from 0.8 GHz to 3.1 GHz and from 2 GHz to 6 GHz with power levels ranging from 30 W to 450 W. Three Class A models are based on gallium arsenide (GaAs) integrated circuit (IC) technology and offer significantly better compression characteristics and increased efficiencies than earlier silicon-based low power amplifiers. The … [Read more...]
$27M for Jamming
The U.S. Navy has awarded the Raytheon Company’s Space and Airborne Systems Division a $27 million contract to provide a technology maturation study of next generation jamming capability. The Next Generation Jammer program will support the Navy’s airborne electronic attack requirements against current and future threats. Under terms of the contract Raytheon will use its unique … [Read more...]
VIDEOs: the latest from Espresso Engineering!
Washington Laboratories Ltd., Interference Technology, and American TCB have teamed to create Espresso Engineering. Their latest offerings include: 1. ATCB’s William Graff reviewing radio law and FCC rules and regs. (1.57 min.) 2. Steve Ferguson clarifying intricacies of CE101 testing.(10.45 min.) 3. Tom Fortier and Joe Avrunin of Tektronix unravel the ever-increasing … [Read more...]
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