Patent ID: 7327328

Claim:
An antenna unit comprising: a circuit board having a main surface and a back surface which are opposed to each other; a planer antenna element mounted on the main surface of said circuit board; a signal processing circuit mounted on the back surface of said circuit board, said signal processing circuit being connected to said planer antenna element; and a shield cover, mounted on the back surface of said circuit board, for shielding said signal processing circuit, wherein said shield cover comprises: a substantially rectangular ceiling portion with four corners which are chamfered; four side wall portions for extending in a predetermined direction at four sides of said ceiling portion; and four corner portions for extending in the predetermined direction at the four corners of said ceiling portion between the side wall portions which are adjacent to each other; said shield cover being mounted on the back surface of said circuit board by soldering at the four corner portions, no gap being provided between said four side wall portions and said four corner portions.