Patent ID: 7728780

Claim:
An antenna device comprising: an antenna substrate; and a multilayer wiring substrate mounted on the antenna substrate, wherein the antennal substrate includes an insulating part, an antenna element part composed of a conductor pattern formed on a predetermined principal surface of the insulating part and a ground pattern part connected to the antenna element part electrically and formed on the principal surface, and the multilayer wiring substrate includes a wiring pattern formed in an inside layer of the multilayer wiring substrate, an opening through which the wiring pattern is exposed on the side of one principal surface of the multilayer wiring substrate, a plurality of through-holes formed so as to surround the opening and penetrate the inside layer of the multilayer wiring substrate while extending from the one principal surface, the through-holes having respective one ends arranged to make contact with the ground pattern part of the antenna substrate, and a ground pattern layer arranged to make contact with respective other ends of the through-holes and also arranged in a position to interleave the wiring pattern against the opening, and wherein the antenna substrate is electrically joined to the multilayer substrate through the through-holes.