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...]
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...]
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...]
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...]
Big Sight, Tokyo: Successful Wrap-Up for Major Expos
NEPCON World Japan concluded on January 30, 2009 in Tokyo, Japan. The largest and premier electronics manufacturing exhibition in Asia, NEPCON World Japan is actually seven expositions taking place concurrently—Internepcon Japan, the International Electronics Components Trade Show, the Printed Wire Boards Expo, Laser and Optics 2009, Electrotest Japan, IC Packaging Technology … [Read more...]
Flower Power: A Whole New Meaning
A recent issue of New Scientist points out an amazing website that looks at electromagnetic current in a particularly offbeat way. The site for Australian Bush Flower Essences, located oddly enough in British Columbia, Canada, explains that once a flower essence is ingested, it settles between the circulatory and nervous systems, thus creating an electromagnetic current arising … [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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