[SI-LIST] [Àüüȸ½Å] Impedance matching with CPW

Thanks a lot for your kind support...

I think I need to explain my problem in detail.

My problem is the impedance matching with CPW.
Input impedance is 50 ohm and the load impedance is R + jX at fixed
frequency.
In that case, what can I design CPW stub for the impedance matching.

For microstrip line, there are several methods in desiging the stub.
How about CPW?

Thanks

Kwang-Seong Choi


¿øº» ³»¿ë:

º¸³½»ç¶÷: Grossman, Brett[brett.grossman@xxxxxxxxx]
¹Þ´Â»ç¶÷: 'kschoi@xxxxxxxxxx'; si-list@xxxxxxxxxxxxx
Á¦¸ñ: RE: [SI-LIST] Impedance matching with CPW
¹ÞÀº³¯Â¥: 2003/02/25 È­ 02:52


Kwang-Seong,
The equations for CPW that I have seen require recursive calculations to 
approximate solutions for the integrals used. A decent reference for these 
is Waddell's Transmission Line Design Handbook. I incorporated this
approach 
in a crude Excel macro, if you want I'll send you a copy offline.
For a decent approximation, thanks to this list, I was redirected to AppCAD 
from Agilent, which is a free transmission line calculator (among other 
things). Some recent postings can point you to the URL for this tool.
Other than that, ADS or HFSS among the many other ECAD tools provide an 
opportunity for further analysis, but as you have mentioned there is a 
learning curve.
Hopefully this helps to provide some answer to your questions.
-Brett
-----Original Message----- 
From: kschoi@xxxxxxxxxx [mailto:kschoi@xxxxxxxxxx] 
Sent: Monday, February 24, 2003 3:39 AM 
To: si-list@xxxxxxxxxxxxx 
Subject: [SI-LIST] Impedance matching with CPW

Dear Experts;
I design CPW pattern for the impedance matching with a given load.  I think 
that unlike microstrip line, 
there is no closed form equation decribing CPW so that the simulator such 
as 2.5 D simulator may be only 
solution for the impednace matching, which needs much time and know-how.
Is there general rule of thumb in designing the CPW for the purpose descibe 
above?  I searched reference book 
and paper but so far I cannot find it.
Thanks...
Kwang-Seong Choi

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