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March 21, 2008

Mtg: Unintended Antenna Behavior of Devices and Systems

by @ 5:30 pm. Filed under ALL, Communications, Computers/Software, Electronics Design, Engineering Mgmt

SCV Electromagnetic Compatibility Chapter
Speaker: Colin Brench, staff engineer, Southwest Research Institute (SwRI)
Time: Social 5:30 PM, Presentation 6:30 PM
Cost: none
Place: Applied Materials Bowers Cafeteria, 3090 Bowers Ave., Santa Clara
RSVP: not required

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 â??antennaâ?? 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 donâ??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 â??intendedâ??.

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