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Electromagnetic Compatibility Society [EMC027]
6:00 PM Refreshments, 6:30 PM Presentations, Wednesday, 21 May
Unintended Antenna Behavior of Devices and Systems
Colin Brench, Southwest Research Institute
This presentation will look at product emission control, considering the numerous antenna effects that are present. A device may be shielded or suppressed at the source, but any radiated emissions that do occur are from an ‘antenna’ of some sort. A great deal of frustration can result from ignoring this simple fact, as fixes that seem reasonable and that should work, simply don’t. With the high data rates in use today even small structures can be effective antennas. The impact of how a device is mounted into a chassis or how a chassis is mounted into a rack can be unexpected. In this presentation, very small device considerations will be discussed up though full sized racks of systems. This presentation also includes product measurements that show these effects directly, computer simulations that were used to first identify and then begin to bound the problem for designers. Animations of field propagation will be used to help visualize how the RF energy travels and radiated. Important details such as the addition of ferrite core filter on a cable and cable shield bonding will also be shown. To show that these effects are pervasive, a concluding section will look at some very common antennas and how they do not always operate as ‘intended’.
Colin is a staff engineer for the Southwest Research Institute (SwRI) in the Electromagnetic Compatibility Research and Testing group. In this position Colin’s responsibilities include developing new EMC technologies, providing consulting services, participating in internal and external research programs, and collaborating with the EMC community at large. Prior to SwRI, Colin spent 22 years at HP (Compaq/Digital).Colin has been active in the area of antenna and shielding behavior since the early 1970’s. He has authored over 20 technical papers and articles and holds eleven patents for various methods of EMI control; others are in process. Colin is a co-author of the book, EMI/EMC Computational Modeling Handbook (Kluwer Academic, 2nd Edition 2001), and in 2002 Colin received the IEEE EMC Society Certificate of Technical Achievement for his contributions to the development of EMC models directed to understanding EMI shielding and antenna behavior. In addition to his technical papers, Colin has presented numerous workshop sessions and training classes on EMC and signal integrity. These embrace a broad range of topics ranging from microprocessor packaging, through printed circuit module issues, to system design and shielding. In many of these classes, explanations are clarified with a combination of simulations and data from measurements. He is a NARTE certified EMC Engineer, a member of the dB Society, a senior member of the IEEE EMC Society, and is serving his second term on the Society’s Board of Directors. He is vice chairman of the IEEE EMCS Standards Development Committee and active in the IEEE EMCS TC-9 and ANSI accredited C63 committees. Colin also served a term as a Distinguished Lecturer for the IEEE EMC Society in 2001 and 2002.
This meeting of the IEEE Central New England EMC Society will be held on Wednesday, May 21, 2008 at EMC Corporation, 228 South Street, Hopkinton. The technical presentation will commence at 6:30PM following a social hour at 6:00 PM with refreshments provided. Directions: From Route 495 North or South take exit 21B to West Main Street. Turn left at the first traffic light west of Route 495, this is South Street. Proceed 1.6 miles on South Street, through the next two traffic lights. Turn right into the third driveway after the second light, marked with sign "228 South Street" Travel 0.2 miles to the end of the driveway and park in the lot. Check in at the Building A main entrance. Conference room 1-2 is to the left of the security front desk.
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Updated: April 25, 2008.