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 … [Read more...]
Power Quality Effects on the Reliability and Susceptibility of EMI Filters
EMI filter performance plays a critical role in limiting emissions and also impacts the immunity of end-use equipment to electrical disturbances. Philip F. Keebler and Kermit O. Phipps EPRI, Knoxville, Tenn., USA Today, electronic equipment is commonplace in every residential, commercial, and industrial environment. Moreover, this equipment depends on increasingly complex … [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 and Xing-Chang Wei Electromagnetic Labs, 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 components increases the … [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, USA 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 … [Read more...]
Antenna Fundamentals
Introduction to Antenna Fundamentals A proper understanding of antennas requires familiarity with electromagnetics, circuit theory, electronics and signal processing. Candace Suriano, Ph.D., Suriano Solutions John Suriano, Ph.D., Nidec Motors, Auburn Hills, MI, USA Tom Holmes, Agilent Technologies, Tipp City, OH, USA Qin Yu, Alcatel-Lucent, Columbus, OH, USA How does … [Read more...]
Magnetic Shielding Basics
Growing complexity in electronics heightens the need for magnetic shielding. Richard Vance Ad-Vance Magnetics, Inc., Rochester, IN, USA Without magnetic shielding, much of today’s sophisticated electronic gear would be larger, less efficient, and in some magnetic environments, completely non-functional. Today’s complex components are extremely sensitive, and … [Read more...]
Board-Level Multi-Cavity Shielding
Photo-chemical machining offers significant advantages over traditional methods of manufacture. Alan Warner TECAN Components Ltd., Weymouth, UK The ever-increasing demands on RF and microwave circuitry design and development teams to achieve EMC, eliminate crosstalk, save PCB real estate, decrease overall product size, provide access for rework and, last but not least, reduce … [Read more...]
Thermal and EMI Shielding Boost Design Reliability
Optimal shielding helps meet the challenges of cramming maximum functionality into minimal PCB space. Paul J. Stus Laird Technologies St. Louis, MO Advances in the miniaturization of electronic components has intensified the need for manufacturers to solve multiple problems simultaneously and earlier in the design process. Solving the issues quickly and early in the design … [Read more...]
Cost Considerations for Selecting RF Shielding Materials
Taking these factors into account can save time and money. Gary Fenical, Laird Technologies Delaware Water Gap, PA RF shielding materials are an important consideration when designing electronic components because these materials help ensure that the electronic device will perform to its optimum functionality. Considering RF shielding materials at the beginning of the … [Read more...]
Compliance Guidelines for China RoHS
Compliance with EU RoHS does not equate to compliance with China RoHS. Grace Lin Crestron Electronics, Inc., Rockleigh, NJ, USA This article provides guidelines to comply with Chinese RoHS regulation, the “Administrative Measure on the Control of Pollution Caused by Electronic Information Products”, which takes effect March 1, 2007. It addresses compliance requirements for … [Read more...]
