Dear Sirs, I am looking for information regarding the temperature/frequency dependancy upon the dielectric constant and dissipation factor for FR-4 and BT laminates (graphs, equations etc). The information I have received so far from our suppliers are quite coarse graphs. Thanks in advance ! Martin Valfridsson R&D Engineer Ericsson Radio Systems AB (Fax: +46 19 58 47 01) ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################