While it is possible to design functional circuits at 900MHz in FR-4 it is not generally recommended for circuits with frequencies exceeding 500MHz Analog or Effective Frequencies of 1GHz. There are a number of high performance materials in the market that are much better suited for this type of application. Rick Hartley does a presentation on this subject and the paper he wrote gives several recommendations on the material properties to be considered in the design of high-frequency designs. His paper is available in the PCB Design Conference Proceedings or from the IPC. Jeffrey A. McGlaughlin PCB Designer Battelle Memorial Institute Columbus Ohio [log in to unmask] -----Original Message----- From: Ko Adeline-FSGA2298 [SMTP:[log in to unmask]] Sent: Thursday, 18 November, 1999 07:10 To: [log in to unmask] Subject: [TN] PCB board material for high freq product > Hi there, > > My engineer is asking me to design a 900Mhz 4-layer brd using the > following information. > As this is my first time doing such a high freq brd. > I wish to know, is this PCB material perform excellent in high freq. > > PCB Info > Top layer --> 1/2 oz copper > Prepreg --> 2 X 1080 > Layer 2 --> 1/2 oz copper > Prepreg --> 2 X 7118 > Layer 3 --> 1/2 oz copper > Prepreg --> 2 X 1080 > Bottom --> 1/2 oz copper > > Brd finishing thickness : 0.031" +/- 0.005" > Material : FR4. > Plating : Tin / Lead 63/37 HAL > > Thanks & Best Rdgs > Adeline Ko ############################################################## 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 ##############################################################