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The AD300C from Arlon is a Laminate with Dk (Dielectric Constant) 3, Df (Dissipation Factor) 0.002, CTE x-y 12, 12 ppm/°C, Thermal Conductivity 0.5 W/mK. More details for AD300C can be seen below.
Laminate for Microwave Printed Circuit Board with Enhanced Thermal Conductivity
You can now find similar products from multiple companies on everything RF.