Good Morning and Happy Holidays Technet, This morning we have been asked to aid a designer trying to get 50 ohm impedance on a high frequency board. It is in the neighborhood of 2.2-2.5 ghz. His question is about best base material to use. This goes beyond what I can tell him. As always, any input is appreciated. Anne Ledger EMDS, Inc. ############################################################## 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 ##############################################################