Collective lamination substrate forming pseudo waveguide

A collective lamination substrate comprises:

• pattern layers laminated in N-layers, where N is an integer and 4 or more, each of the pattern layers being laminated alternately with a dielectric layer;
• a pseudo waveguide formed penetrating through the pattern layers in a lamination direction in which the pattern layers are laminated;
• a transmission line and a converter section which are formed in a first layer and Nth layer located at outermost layers of the pattern layers in the lamination direction, the converter section mutually converting between an electrical signal flowing through the transmission line and radio waves being transmitted and received via the pseudo waveguide;
• ground patterns formed at portions from a second layer to an N−1 th layer in the pattern layers, at least covering a periphery of a waveguide formation section which is an electrical opening to form the pseudo waveguide;
• antennas formed at portions corresponding to the second and the N−1 th layers in the waveguide formation section;
• a first via group provided in a periphery of the waveguide formation section, composed of a plurality of vias that establish conduction between a ground pattern formed in the first layer of the pattern layers and a ground pattern formed in the second layer of the pattern layers, and a plurality of vias that establish conduction between a ground pattern formed in the N−1 th layer of the pattern layers and a ground pattern formed in an N th layer of the pattern layers;
• and
• a second via group provided in a periphery of the waveguide formation section and positioned at a more outer portion than the first via group, the second via group being composed of a plurality of vias that make conduction through the ground patterns formed at the portions from the second layer to the N−1 th layer.