Patent ID: 8179306

Claim:
A high-frequency circuit board, comprising: a dielectric substrate; a mounting portion which is disposed on a first surface of the dielectric substrate and on which an electronic component is to be mounted; a waveguide formed in the dielectric substrate, the waveguide comprising: a pair of main conductive layers which extend in a same direction so that surfaces thereof oppose each other, and are electrically conductive; and a plurality of conductive columns which are electrically conductive, which are formed throughout a portion between the pair of main conductive layers, and which are arranged in two lines along a transmitting direction of an electrical signal so that a distance therebetween in the transmitting direction is equal to or shorter than a cutoff wavelength; and a heat conductor which is formed throughout a portion between the mounting portion and the waveguide and has a thermal conductivity higher than a thermal conductivity of the dielectric substrate.