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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu