Patent ID: 8358185

Claim:
A waveguide connection structure that comprises: a dielectric substrate having a through hole of which an inner wall has a conductor provided thereon so that an electromagnetic wave is transmitted through the through hole; and a waveguide substrate that has a waveguide hole and is made of metal or of which a surface is coated by metal, wherein the waveguide connection structure has a choke structure including, an inside inner layer conductive pattern that is formed in a surrounding of the through hole on an inner layer of the dielectric substrate, an outside inner layer conductive pattern that is formed in a surrounding of the inside inner layer conductive pattern on the inner layer of the dielectric substrate while being positioned apart from the inside inner layer conductive pattern, a dielectric part that is positioned between the inside inner layer conductive pattern and the outside inner layer conductive pattern, a dielectric transmission path short-circuited at an end that is formed by an inner layer conductor and a plurality of penetrating conductors, the inner layer conductor being provided in a position that is apart from the dielectric part by a predetermined distance in a layer-stacking direction of the dielectric substrate, and the plurality of penetrating conductors connecting the inner layer conductor to the inside inner layer conductive pattern and to the outside inner layer conductive pattern, a surface dielectric layer that is provided on the inside inner layer conductive pattern and the outside inner layer conductive pattern so as to oppose the waveguide substrate, and a surface conductor that is provided in a surrounding of the through hole on the surface dielectric layer, which is a surface of the dielectric substrate opposing the waveguide substrate, while extending outward from the conductor provided on the inner wall of the through hole such that the dielectric part is not covered thereby.