Hello Si List, Does the term "asymmetric coupled stripline" mean anything to anyone? The structure in question consists of -- a solid copper layer -- edge coupled pair with coplanar ground tracks on the outsides -- another identical edge coupled pair with coplanar ground tracks on the outsides, right above the first pair as if broadside coupled -- solid copper layer I have come across this configuration twice during this week. Once, the track pairs were connected at each end (upper "left" to lower "left", etc.) and in the second case the pairs are not connected at all. I realize this is half a question but if anyone recognizes anything here, or has the time and energy to speculate, I'll be grateful to receive your input on or off list. Many thanks for reading, Ken Ken Taylor Polar Instruments, Inc. ken.taylor@xxxxxxxxxxxxxxxxxxxx ------------------------------------------------------------------ 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