RE: [SI-LIST] : Trace Impedance Selection

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From: Mary (mary@advocate.net)
Date: Mon May 08 2000 - 07:49:32 PDT


Steve,

Thanks for responding. I appreciate your insight. My background
is more theoretical and I wjould like to learn more about how SI
engineers view things.

>As much as I agree with that aspect, the notion I believe Vinu was
>attempting to address, ( and I believe of practical value ) is that the
>flux density surrounding T-line on a PWB as typically a microstrip or
>stripline goes up as the impedance goes down and vice-versa.. For those
>constructions a significant amount of the energy transmitted down the line
>does so in the dielectric surrounding the signal and return etch. That
>flux is free to intercept any antenna we place in the field, whether it is
>a chassis slot, or a susceptor trace.

I had not considered relating the characteristic impedance to a
concentration of flux. This seems reasonable for microstrip geometries.
I will give this some more thought.

You also mentioned striplines. Are you suggesting that the radiation or
coupling from a stripline is proportional to the characteristic impedance?
This seems anti-intuitive to me.

Mary

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