[SI-LIST] Re: Single-ended S-para plot of 2 microstrip traces
- From: Paul Levin <levinpa@xxxxxxxxxxxxx>
- To: scott@xxxxxxxxxxxxx
- Date: Tue, 11 Mar 2003 15:54:19 -0800
Dear Sam,
As with all transmission line filters, there will be a repeating frequency
response. Remember that an open stub will turn into a short when its length
is 1/4, 3/4, 5/4 etc. of a wavelength. Of course as the frequency increases,
the loss of the line increases, so the Q and notch depth become less severe.
Yes, this performance is real.
Regards,
Paul
_______________
Scott McMorrow wrote:
> Sam,
>
> You have discovered that the even modes and odd modes for microstrip do
> not propagate with the same velocity. This causes a resonance due to
> crosstalk coupled to/from the adjacent line. Your modeling is absolutely
> correct and can be measured. Jeff Loyer of Intel discovered the same
> effect several months ago.
>
> You will not see this issue with stripline, since the modal propagtion
> velocities are equivalent.
>
> best regards,
>
> scott
>
>
--
Paul Levin
Senior Principal Engineer
Xyratex Storage Systems
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