The choice for 2-18GHz was microstrip on Duroid...at REMEC and RF Microsystems.... When I left they were talking about doing some work in the 40GHz range, but I never saw what became of that...My guess is that at the higher frequencies, temperature stability and moisture susceptibility would play a big part in the design due to the TCE of the materials and maintaining some sort of real stability would be the challenge. You would probably need to pick very stable materials for the substrate and adjust the thickness of it such that the features you wished to etch were of sufficient physical size to preclude extra special treatment for the etching process. I know we targeted the line width to be around 22 mils for a 50 ohm line...If you're making edge coupled filters, or mixers, etc, you may run into line widths as small as 3-5 mils... that can run against the etching limitations of most manufacturers... It's all a function of the base material dielectric and it's thickness... well there's more to it than that...(but that's classified...) Edge mount connectors need some impedance matching at the connection point, typically tuning tabs are used... I have seen some SMA's that are designed to work up to the 40GHz range.... Cost effective materials would be Rogers RO3003, 3006, 3010 and the low moisture versions, about 16.00 a sq. ft....available from www.rogers-corp.com I have done parallel edge connector transitions and right angle transitions with N-type, SMC, SMA, SMB's and more... I still think microstrip is the simplest most cost effective method... not to say it can't be done otherwise... :) - Bill Brooks -----Original Message----- From: Tracy Black [mailto:[log in to unmask]] Sent: Thursday, June 15, 2000 12:53 PM To: [log in to unmask] Subject: [TN] PCB trace at high freq. Hi guys: I was asked an interesting question by a customer. That was what "trace design" do most people prefer when the operating frequency is the range of 20-30GHz; i.e. Stripline, micro-strip, or other type of configuration. Does that change for an edge mount? Regards, Tracy Black Engineer Microwave Engineering Phone: 623-245-1050 xt 437 Fax: 623-934-5160 E-Mail: [log in to unmask] ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################