Patent ID: 8773321

Claim:
An antenna unit, comprising: a housing composed of a conductive material, the housing including a bottom wall, first and second side walls that extend upward from corresponding side edges of the bottom wall, a rear wall that extends upward from a rear edge of the bottom wall along rear edges of the first and second side walls, an upper wall that extends from an upper edge of the first side wall toward the second side wall leaving a gap between an edge of the upper wall and the second side wall, and an opening formed by the bottom wall, first and second side walls and the upper wall to face the rear wall; a substrate fixed to the upper wall, a part of the substrate projecting from the edge of the upper wall to a position that is closer to the second side wall than is the edge of the upper wall; and an antenna shaped like a cuboid and having a radio-wave emitting aperture in a side surface thereof, the side surface intersecting a long axis of the antenna and the antenna being fixed to the part of the substrate projecting from the edge of the upper wall such that the radio-wave emitting aperture of the antenna faces the opening of the housing.