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Denis--

Memory seems to recall seeing a product announcment for either a base material
and/or prepreg.  Rogers markets a high dielectric constant (dk) material with
a dk in the range of 9-10 for an organic equivalent of alumina.

Many years ago, we made some custom material using a loaded epoxy and glass
fabric (2 plys of a 116),  we loaded the resin with a ceramic powder -
titanium dioxide with dk>75 (or some of the titanates) could be used.  dk was
about 12, and conductor adhesion was marginal (but acceptable for the
experiment).

Ralph Hersey
e-mail:  [log in to unmask]

--------------------------------------
Date: 4/2/96 12:52 PM
From: [log in to unmask]
Item Subject: cc:Mail Text
     Hello,
     
     Does anyone have information on PCB materials with a dielectric 
     constant of 5.5 (or higher)? We are trying to reduce trace impedances 
     on a standard (59-mil dielectric) thickness 2-layer board while using 
     reasonable trace widths.
     
     Thanks,
     
     Denis Mori
     
     [log in to unmask]


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