There is an episode about high frequency PCB built on RO4003C laminates.

RO4003C high frequency materials are woven glass reinforced hydrocarbon ceramic-filled laminates produced by Rogers Corporation. It has the similar electrical properties of PTFE/woven glass and manufacturability of epoxy resin materials.

RO4003C materials are designed to offer superior high frequency performance, with dielectric constant of 3.38 +/- 0.05, dissipation factor of 0.0027 at 10 GHz.

Low loss results in excellent electrical performance and allows applications with high operating frequencies.

Multi-layer circuit boards on RO4003C are manufactured by combining several cores through bondply RO4450F. In order to save production cost but not reduce signal loss in high frequency environment,the construction of high frequency materials mixed with FR-4 came into being.At present, the manufacturing technology of hybrid circuit board is mature and they are welcomed in the market.