Anne My previous outfit used 4 layer FR4 for a 2.45GHz oscillator cct. Topside of board was heavily ground planed and a tinned plastic can was on the bottom side. Tracking was std and frequency was trimmed by machine. I can't remember the specified copper weight (1/2 ounce rings a bell) but it was pretty tied in to the design. Best Regards Ian Boyton >From: Anne Ledger <[log in to unmask]> >Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, Anne Ledger ><[log in to unmask]> >To: [log in to unmask] >Subject: [TN] 2.5 Gig design question >Date: Tue, 14 Dec 1999 08:49:38 -0500 >MIME-Version: 1.0 >From [log in to unmask] Tue Dec 14 06:12:17 1999 >Received: from [209.42.15.76] by hotmail.com (3.2) with ESMTP id >MHotMailBA1F97BF0095D820F3B2D12A0F4CDCB90; Tue Dec 14 05:57:21 1999 >Received: from jefry ([209.42.15.79])by mail.ipc.org (8.8.8+Sun/8.8.8) with >ESMTP id HAA22711;Tue, 14 Dec 1999 07:56:04 -0600 (CST) >Received: from IPC.ORG by IPC.ORG (LISTSERV-TCP/IP release 1.8d) with spool >id 3361057 for [log in to unmask]; Tue, 14 Dec 1999 07:39:15 -0600 >Received: from mail.ipc.org (209.42.15.76:56236) by IPC.ORG (LSMTP for >Windows NT v1.1b) with SMTP id <[log in to unmask]>; Tue, 14 Dec >1999 7:39:14 -0600 >Received: from postmaster2.emds.com ([38.246.95.115]) by mail.ipc.org > (8.8.8+Sun/8.8.8) with ESMTP id HAA22558 for <[log in to unmask]>; Tue, > 14 Dec 1999 07:53:08 -0600 (CST) >Received: by POSTMASTER2 with Internet Mail Service (5.5.1960.3) id ><X71QM3Q6>; Tue, 14 Dec 1999 08:49:45 -0500 >X-Mailer: Internet Mail Service (5.5.1960.3) >Message-ID: <E3F39BDE675ED31192CE00508B2C8CAB03D1DE@POSTMASTER2> >Sender: TechNet <[log in to unmask]> > >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 >############################################################## ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ############################################################## 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 ##############################################################