Patent ID: 8487829

Claim:
An antenna unit comprising: a circuit board having a main surface and a rear surface which are opposed to each other; a planar antenna element mounted on the main surface of said circuit board, said planar antenna element being configured to receive a radio wave; a signal processing circuit mounted on the rear surface of said circuit board, said signal processing circuit being connected to said planar antenna element; a shield cover mounted on the rear surface of said circuit board, said shield cover electromagnetic-shielding said signal processing circuit; and a bottom plate disposed so as to oppose to said shield cover, wherein said shield cover comprises: a tubular side wall portion extending from the rear surface of said circuit board in a direction perpendicular to a plane in which said circuit board extends; and a ceiling portion extending at edges of said tubular side wall portion in parallel with the plane in which said circuit board extends, wherein ceiling portion is opposed to said bottom plate, wherein said ceiling portion comprises: a mounter vacuumed portion disposed in a center portion of said ceiling portion, wherein said mounter vacuumed portion is capable of being vacuumed by a vacuum nozzle of a mounter; a ring-shaped outer edge disposed to extend inwardly from an end of said side wall portion; and a plurality of beam portions joining said mounter vacuumed portion to said outer edge, wherein said bottom plate is disposed directly below the ceiling portion of said shield cover, and the ceiling portion comprises opening portions covered with said bottom plate, and wherein said antenna unit carries out electromagnetic shielding of said signal processing circuit using both of said shield cover and said bottom plate.