Kappa™ 438 Laminates
Kappa 438 thermoset laminates were developed for wireless circuit designers looking for a better performing and more reliable alternative to FR-4 laminates. These laminates were designed using a glass reinforced hydrocarbon ceramic system that offers superior high frequency performance and low cost circuit fabrication resulting in a low loss material which can be fabricated using standard epoxy/glass (FR-4) processes.
Kappa 438 laminates have the UL 94 V-0 flame retardant rating and are lead free solder process compatible, and offer dielectric constants tailored to FR-4 industry standard norms which facilities ease of converting existing FR-4 designs where better electrical performance is needed.
More details here: http://www.rogerscorp.com/acs/producttypes/38/Kappa-438-Laminates.aspx
Surely looks promising……Happy Designing….!!!!