---------------------------- Forwarded with Changes ---------------------------
From: Administrator at Rogers-MCD
Date: 4/1/96 9:23AM
To: Art Aguayo at Rogers-MCD
Subject: Message not deliverable
----------------------------------- Returned -----------------------------------

From: Art Aguayo
Date: 4/1/96 9:22AM
*To: 27=technet::[log in to unmask]::25=SMTP  at ~FABRIK
*To: smurthy::(SMRTHY) at ~FABRIK
Subject: Re: RF substrates - test vehicles
-------------------------------------------------------------------------------
     The industry standard test for dielectric constant is IPC-TM-650
     2.5.5.5. This is a stripline test usually done at 10 GHz.
     Unfortunately, the test needs material free of copper and a certain
     thickness of ground plane spacing is needed. At Rogers, manufacturer
     of various types of microwave/RF laminates (PTFE and non-PTFE based),
     we have found this to be the most repeatable test of the ones we have
     evaluated (microstrip, waveguide insertion test, HP dielectric probe).
     I don't know if what you need to do can be done using 2.5.5.5, but if
     you want to talk give me a call. Currently I'm travelling but should
     be back April 8.

     Art Aguayo, Technical Services/Applications Engineer
     [log in to unmask]
     http://www.rogers-corp.com


______________________________ Reply Separator _________________________________

Subject: RF substrates - test vehicles
Author:  smurthy::(SMRTHY) at ~FABRIK
Date:    3/26/96 12:32 PM


From: [log in to unmask]
Date: Tue, Mar 26, 1996 12:32 PM
Subject: RF substrates - test vehicles
To: technet
From: Sasi Murthy
448-5688 (tie 778)
Subject: RF substrates - test vehicles
I am in the process of investigating high frequency RF substrates with
respect to assembly processes, etc and am looking for any available
test vehicles that would allow measurement and testing of the substrate
after multiple reflows (i.e for warpage, SIR, variation in dielectric constant,

etc..)
I am interested in looking at variations of teflon substrates.
Does anyone know of available vehicles ?
Thanks in advance.

Regards, Sasi
Process Applications Engineer
(416) 448-5688, fax (416) 448-4736
[log in to unmask]