Patent ID: 8106302

Claim:
A circuit board applied to a communication product, comprising: a power transistor; a main body having a surface that the power transistor is embedded within, the surface including an insulating layer, a plurality of first openings disposed at intervals in the insulating layer and around the power transistor, and a plurality of soldering portions each being exposed from a respective one of the first openings; and an isolation cover covering the main body, a cover body of the isolation cover being soldered to each soldering portion, and a plurality of second openings being equidistantly spaced on a lateral side of the cover body, a width of each second opening is between 1λ and 2λ, wherein λ=ν/f and λ is a wavelength of a wave emitted from the communication product, ν is a speed (m/s) of the wave, and f is a frequency (Hz) of the wave, a maximum value off being 26.5 GHz.