Patent ID: 8581800

Claim:
A millimeter wave reception device, comprising: a base member; an antenna portion placed on an upper surface of said base member; and a cover arranged above said antenna portion to cover said antenna portion, wherein said antenna portion is formed of a hemispherical lens antenna and arranged within a space formed by said upper surface of said base member and an inner surface of said cover, said cover is formed in a hollow conical shape or a hollow pyramid shape with a top portion having a peak shape, in a tapered shape, and includes not less than one inclined surface having a constant gradient such that said space becomes narrower at a position closer to an upper portion, and an angle formed between an inclined surface of said cover and said upper surface of said base member is not less than 60° and not more than 90°, said top portion of said cover and an apex portion and a central portion of said antenna portion are present within a directional region of said antenna portion, and said top portion of said cover is located above said apex portion and said central portion in a vertical direction connecting said apex portion and said central portion of said antenna portion.