hi, i have a copy of 'everything you ever wanted to know about laminates...but were afraid to ask', by c.l. guiles, technical director, electronic substrates division, arlon, inc. that tells about characteristic impedance and loss tangent (including its aliases)and how they relate to design. it's on pages 4 and 5 of my copy. i'll fax it to you (the originator) if you'd like. others may want to call arlon and request this paper. phil -----Original Message----- From: Kile, Judy K (MED) [mailto:[log in to unmask]] Sent: Tuesday, February 22, 2000 11:54 AM To: [log in to unmask] Subject: [TN] DC Lost Tangent - Controlled Impedance I am looking for an explanation/definition of "DC Lost Tangent" in regards to Controlled Impedance. Can anyone suggest a reference book which may cover this? Thanks for any help! Judy g GE Medical Systems ----------------------------------------------------------------------- Judy Kile Senior Designer - Global Electrical Technology Center Office: 414-785-5744 Fax: 414-785-5695 Email: [log in to unmask] ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################