| abstract |
Provided is a porous low-dielectric polymer film which has a low dielectric constant at high millimeter-wave frequencies to fulfill utility as a sheet for a millimeter-wave antenna, and provides excellent circuit board processability. The porous low-dielectric polymer film is made of a polymer material and formed with fine pores dispersed therein, wherein the film has a porosity of 60% or more, and the pores have an average pore diameter of 50 µm or less, and wherein a porous structure of the film is a closed-cell structure. |