| abstract |
Provided is a porous low-dielectric-constant polymer film which has a low permittivity with respect to the high frequencies of millimeter waves, while being useful as a sheet for a millimeter-wave antenna and having excellent circuit board processability. The porous low-dielectric-constant polymer film is a polymer film in which fine pores are formed dispersed in a film made of a polymer material, and is characterized in that the porosity of the film is 60% or greater, the average pore size of the pores is 50 μm or less, and the porous structure of the film is a closed-cell structure. |