Prepreg And Uses Of The Same

A prepreg is provided. The prepreg is prepared by immersing a reinforcing material into a resin composition and drying the immersed reinforcing material, wherein the resin composition has a first dielectric constant and comprises a thermosetting resin component, a hardener and a filler. The reinforcing material has a second dielectric constant, and the ratio of the first dielectric constant to the second dielectric constant ranges from 0.8 to 1.05.