Waveguide

A waveguide, comprising:

• a first laminated substrate in which a first dielectric layer and a plurality of first conductor layers including a first opening are laminated on each other;
• a first through-via group of a plurality of first through-vias electrically connecting between the plurality of first conductor layers, the plurality of first through-vias being linearly arrayed in an in-plane direction of the first laminated substrate at a spacing equal to or less than a half wavelength of an electromagnetic wave propagating through the waveguide;
• and
• a second through-via group of a plurality of second through-vias electrically connecting between the plurality of first conductor layers, the plurality of second through-vias being linearly arrayed at the spacing in the in-plane direction of the first laminated substrate, wherein
• the waveguide includes no other through-via than the plurality of first through-vias and the plurality of second through-vias,
• in the in-plane direction of the first laminated substrate, the first through-via group and the second through-via group are disposed in a direction orthogonal to a direction of an electric field of a signal propagating in a thickness direction of the first laminated substrate, are disposed to face each other across the first opening, and are disposed along and adjacent respective peripheral edges of the first opening to enclose the first opening,
• a spacing between the first through-via group and the adjacent peripheral edge of the first opening is less than the spacing of the plurality of first through-vias, and
• a spacing between the second through-via group and the adjacent peripheral edge of the first opening is less than the spacing of the plurality of second through-vias.