| 摘要 |
<p>Disclosed is a composite material, a high-frequency circuit baseboard made therefrom and a production method thereof. The composite material comprises: a dispersed emulsion of fluoropolymer with a low dielectric loss; a porous, expanded polytetrafluoroethylene film; and a powdery packing. The high-frequency circuit baseboard made from the composite material comprises: several laminated sheets of prepreg made from the composite material, and copper foils pressed over the two sides thereof. The baseboard uses a porous ePTFE film with an excellent dielectric property as a carrier material, which can lower the dielectric constant and dielectric loss angle tangent of the composite material and high-frequency circuit baseboard; due to good flatness and uniformity of the porous ePTFE film, the dielectric constant of the high-frequency circuit baseboard and prepreg made by using the film as the carrier material is isotropic in both X and Y directions; and the thickness of the prepreg made from the composite material can be regulated by employing porous ePTFE films with a different thickness, which avoids the cracking problem caused by using a thick film produced by casting.</p> |
