I have a customer that designed and tested a 5Ghz oscillator using 0.031" thick FR4-difunctional substrate. The board is a simple design with 120 smt comp's and some th. The customer tested proto-type units and they works good. Obviously all of its other boards are designed using FR4-difuntioinal. I don't think any board contract mfg want to take this job when I see the board layout (it is not designed for manufacturability). My question to you is "What board material is suitable for 5Ghz without eating up too much cost? I looked into Rogers's material but don't think the customer want to pay 10 times more. regards Matthew NII-Norsat International Inc. ################################################################ 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 technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################