[SI-LIST] : Cross hatched planes

fabrizio zanella (fzanella@fishbowl02.lss.emc.com)
Fri, 18 Jun 1999 14:48:35 -0400

I have a question regarding high frequency (over 500MHz) signals running
over ground planes that are cross hatched, which is commonly done on flex
circuits. The issue is how to accurately model the characteristic and
differential impedance for the flex circuit traces. If, for example, I use
a 2D field solver (where I assume an ideal ground plane) and am designing
for 100 ohms differential impedance, what percent increase in impedance
should I expect if the ground plane will actually be cross hatched?

thanks and regards,

Fabrizio Zanella
EMC, Hardware Engineering
508-435-2075, x4645

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