According to one embodiment of the present invention, there is provided a connector for coupling a waveguide and a substrate. The connector comprises a first opening formed in a direction perpendicular to one side of the substrate and attached to one side of the substrate; a second opening to which a waveguide for signal transmission can be attached, the second opening being formed in a directionparallel to the longitudinal direction of the waveguide; and a signal guide portion connecting the first opening portion and the second opening portion and including a hollow portion surrounded by theconductive layer therein.