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The N4800-20 SI from Park Electrochemical Corp is a Laminate with Dk (Dielectric Constant) 3.3 at 10 GHz, Tg 200 °C. More details for N4800-20 SI 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.