WOW! what a coincidens, I was just about to ask this myself....... I have a faxed sheet from someone that tells me that FR4/1.5mm thick/35microns copper has a dieletric constant at 1MHZ of 4.7 OHMS CM. However I wanted to confirm this....Any comments? T.T.F.N Matthew Lamkin Printed Circuit Board Draughtsman Protec Fire Detection PLC Churchill Way, Nelson, Lancs BB9 6RT. Tel 01282 717393 Fax 01282 717273 Email = [log in to unmask] Company Web Site = http://www.protec-fire-detection.plc.uk >---------- >From: Yvon Hache[SMTP:[log in to unmask]] >Sent: 23 February 1999 20:42 >To: [log in to unmask] >Subject: [TN] FR4 dielectric constant > >Hello out there, > >My weekend seems longer now that we have designated "Steve's day" on Friday. > >I am a design engineer and started working with RF stuff on this last design. > I am doing the calculation for a microstrip width for a FR4 PCB, 0.062" >thick. What would be the dielectric constant of this material? > > > >Yvon Hache >Design Engineer >Concept + Inc. > >T: 506-863-2467 >F: 506-858-4075 >[log in to unmask] >www.concept-plus.com > >################################################################ >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's web site (http://www.ipc.org) "On-Line Services" section >for additional information. >For technical support contact Hugo Scaramuzza at [log in to unmask] or >847-509-9700 ext.312 >################################################################ > ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################