We designed some 60 GHz circuits on Corning 7740 glass substrates. These are 800um thick and have epsilon about 4.5. One use to get on some nanometers Ti/Cu binder and then copper. Very fast signal substrates, low losses, little spurioses, little noise etc. May be something for you? /Inge ----- Original Message ----- From: "McGlaughlin, Jeffrey A" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, December 01, 2008 7:54 AM Subject: Re: [TN] Alumina Substrate Steve - Coorstek looks promising. I have not been given packaging specs but expect the outline to be >>25mm square the since we are dealing with frequencies >>10GHz. Jeffrey A McGlaughlin, CID Engineering Designer/EAS Room 4-2-50 Phone (614)424-7582 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven Sent: Monday, December 01, 2008 9:53 AM To: [log in to unmask] Subject: Re: [TN] Alumina Substrate Jeff, Just one of multiples out there, but Coors is still into thin and thick film ceramics. I pasted their thin film ceramics link below because I equate HF with thin film patterning and 99% alumina. Whichever you choose, they have it. http://www.coorstek.com/electronics/ceramicsubstrates/thinfilm.asp Laserage does laser processing of thick and thin film substrates if you need holes cut, scribe lines for snapstrates, etc. Don't recall if they do dicing. We do that inside so don't need to ask for that. There are multiple other laser houses out there too. http://www.laserage.com/ Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey A Sent: Monday, December 01, 2008 8:57 AM To: [log in to unmask] Subject: [TN] Alumina Substrate To All, I have been ask to identify a source for some small high frequency circuits on 5 mil thick Alumina substrate. Can anyone recommend a source in the US (absolute requirement)? 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