How to define a strip line in HFSS

Hi all,
I am wondering how to define a stripline in HFSS. Suppose I have a strip sandwiched between two ground planes, how do I defined a single lumped port for this stripline set up? Do I have to draw two integration lines originating from each of the ground planes? Do I need more than one mode to define the port in this case?
Thanks for your insight,
Waveplumber
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Hi
You should use waveport, not lumped port. Define in 4-5 time larger than the strip, and from lower to upper ground.

try this

http://www.microwaves101.com/encyclopedia/stripline.cfm

and

http://www.ansoft.com/hfworkshop03/Steve_Rouselle.pdf

look at the middel of prsentation the port in the center parallel to gnd.

pl