RE: [SI-LIST] : Merits of low dielectric constant

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Fri Jun 23 2000 - 11:12:06 PDT


>Co (intrinsic capacitance) is directly proportional to Er
>The correction factor for Zo for capacitive loading is proportional to
>SQRT(Co) for small Co
>
>Therefore, the correction factor for Zo for capacitive loading becomes
>proportional to SQRT(Er) for small Er.
>
>Therefore, the correction factor is smaller for smaller Er.
>
>Am I on the right track?
 
I think this "correction factor" you speak of, is for a capacitive "stub"
hanging off a main transmission line.

If you are using an electrically short, unterminated coax, attached to the
middle of a longer transmission line, then this is a consideration.

If you are using terminated coax transmission lines and no unterminated
stubs, then I think it's irrelevant.

Andy

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