Murata Manufacturing Company, Ltd., well known maker of filters, ferrite devices, and other electrical components, has announced that it has reached an agreement with Showa Denko K.K. to purchase that firm’s functional polymer capacitor business. The actual transfer of ownership is expected to take place later in 2009. The Murata announcement stressed its corporate commitment … [Read more...]
Satellite System Passes EMI, Acoustic, & Thermal Testing
In other news emphasizing the growing significance of satellite communications, the Boeing Company has announced that a Boeing-led team has completed the final testing and integration of the Space Based Space Surveillance (SBSS) system under development for the U.S. Air Force. When launched, the SBSS is intended to revolutionize U.S. space situational awareness by providing … [Read more...]
Cancer Institute Issues Advice Re EM Exposure
In a follow-up to a story that the eNews carried last summer, Dr. Ronald Herberman of the University of Pittsburgh Cancer Institute has listed ten important precautionary steps for limiting an individual’s exposure to electromagnetic radiation from cell phone use. According to the Institute’s website, these recommendations have been reviewed by Pitt experts in neuro-oncology, … [Read more...]
Conductive Painting of Plastics: Delivering Value and Flexibility
Portable electronics manufacturers must evaluate coating processes based on consistency, repeatability, economy, and the availability of applicators worldwide. Roy Bjorlin, William Chen, Neil Browes and Darren Evans Spraylat Corporation Pelham, NY, USA Conductive paint technology has grown steadily in preference when conductive coatings are required on injection-molded … [Read more...]
Selecting Antenna/Power Amplifier Combinations for the Coming New RF Immunity Standards
Though far from certain, it looks as if 6 GHz is a strong candidate for the upper frequency for consumer products. Art Cohen A.H. Systems, Inc., Chatsworth, CA, USA Thomas Mullineaux Empower RF Systems, Inc. Inglewood, CA, USA Testing products for susceptibility to radiated fields above 1 GHz is on the horizon. The new medical standard now stipulates testing to 2.5 GHz, and … [Read more...]
HIRF Testing in an Anechoic Chamber
A detailed examination of radiated field and transmitted power test techniques MICHEL LE CLECH, EMITECH ABSTRACT HIGH PULSED E-FIELD TEST LEVELS increased at the end of the 1990s. At the same time, many efforts were made to develop a very efficient test technique with the mode-stirred chamber. However, by improving the antenna design and test distances, comparable levels can … [Read more...]
Reflections on Absorbers
High frequency, broadband performance links recent improvements in EMI shielding components Jim May, Ferrishield, Inc., Scranton, PA, USA Just as the electronics industry has experienced exponential change over the past decades, EMI shielding components have undergone vast changes and improvements. Just ten years ago, many of today's widely-used gaskets, filters, ferrites, … [Read more...]
Input Power – It’s More Than Just a Line Cord
The power distribution and control function has matured into a full-fledged design discipline. Roger Edelson Edelson Associates, Los Angeles, CA, USA Power distribution and control (and the associated cable management function), while not a sexy topic, has grown into a recognizable, and important, subset of industrial equipment design. Power distribution and control … [Read more...]
Aspects of Conductive Filler Loading on EMI Shielding and DC Volume Resistivity
Brian W. Callen, B. Sc., Ph.D. and Claudia E. Johnston Westaim Ambeon, Fort Saskatchewan, Alberta, Canada Dennis K. Morland, P. Eng., M.Sc. The Northern Alberta Institute of Technology, Edmonton, Alberta, Canada INTRODUCTION Conductive fillers for plastics have been used in EMI shielding applications for many years. Initially pure metallic powders such as nickel or copper … [Read more...]
Antenna Polarization Measurements
Losses can arise from polarization mismatches. Ricardo Perez Alion Science and Technology, Annapolis, MD Antenna polarization is one of many parameters to consider when designing a system. The polarization of the transmitter antenna in a system should be properly aligned with the receiver antenna to maximize coupling. Maximum signal coupling between stations occurs when both … [Read more...]
