RE: Product Safety: A Matter of Law or Litigation?Neven, I did some rather intensive analysis of shielding effectiveness over the course of several weeks a while back. Results were extremely informative.
I've read a couple of fields and waves books for slot analysis. Rau is the one I prefer. I'm at work, but I'll get the name of it and the ISBN as well. I've done some experiments with "small" stubs and loops with reference to wavelength. And I was surprised to find a rather predictable approx -10dB rolloff per several decades from lo to high frequencies. Results were debatable. Converting the wire stubs over to slots by way of Babinet makes me think that the roll-off for slots is similar. And with this information, I started my little analysis in the chamber on products. I haven't seen nor am I really worried about problems with holes. Unless of course they're big. Slots are your worst violator. This is because of the mechanism by which apertures work. It's, in my opinion, more difficult to impose a voltage differential across a round hole than it is across a slot. Slots are more directional than wires by a factor of roughly 10. That makes your product particularly susceptible during emissions. Anywho, I'll get you the name of the book and specifics for ya. And if you want, maybe you can pop over here to do some testing. - Doug McKean **** To unsubscribe from si-list or si-list-digest: send e-mail to majord...@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****
