[SI-LIST] : Offset stripline

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From: Haris Japic (hjapic@yahoo.com)
Date: Fri Jun 23 2000 - 11:41:29 PDT


Gentleman,

I have question regarding offset (asymmetric)
stripline.

________________________ PLANE

         h2
        ------ trace
                     H

         h1

________________________ PLANE

Equation for the characteristic impedance, that I
found and used, is:

Z0~= [80/sqrt(Er)]ln(4.75(h1/w)*(1-h1/4*h2)

MY QUESTION:
How come that characteristic impedance of the trace
relates differently to thickness h1 and thickness h2?
What if we flip this geometry by 180 degrees? Does
that mean that characteristic impedance of the trace
is going to change?
I used polar field solver to perform the experiment
and I got two different characteristic impedances as
the result. Why?

Thanks in advance for your input regarding my
question.

Haris Japic

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