An evacuated core circuit board (10) for dissipating heat from a heat generating electronic component, the evacuated core circuit board comprising: at least one circuit layer (12) to which the heat generating electronic component (14) is electronically coupled; a base layer (16) a comprising a body structure (19) having a substantially hollow interior (20); and a dielectric layer (18) provided between at least a portion of the circuit layer (12) and the base layer (16), wherein the hollow interior (20) is at least partially evacuated.