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The TLF from Taconic is a Laminate with Dk (Dielectric Constant) 3.4, 3.5 +/- 0.07, Df (Dissipation Factor) 0.002. More details for TLF 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.