Transmission/reception unit with improved antenna gain

A transmission/reception unit comprising:

• a circuit board having a wiring pattern including various electric components;
• a cover made of sheet metal which is mounted to cover the electric components and has one of a cubic and hexahedral box shape;
• and
• an antenna mounted on the circuit board,
• the cover having:
• a top wall;
• a first, a second, a third and a fourth side walls which are formed by bending four sides of the top wall;
• a first corner defined by the neighboring first and second side walls;
• a second corner defined by the first side wall and the neighboring third side wall;
• a third corner defined by the second side wall and the neighboring fourth side wall;
• and
• a fourth corner defined by the neighboring third and fourth side walls,
• the antenna having:
• an antenna element as a conductor laid along the first side wall of the cover;
• and
• transmission and reception terminals and a ground terminal which are provided in a vicinity of the first corner and located at one end of the antenna element,
• wherein the ground terminal is connected to a ground pattern provided on the circuit board, wherein one of the first corner of the cover and the vicinity of the first corner is soldered to the non-ground wiring pattern, and wherein the ground pattern is connected with one of:
• one of the second corner and a vicinity of the second corner,
• one of the third corner and a vicinity of the third corner,
• one of the fourth corner, located diagonally to the first corner, and a vicinity of the fourth corner, and
• one of part of the third and fourth side wall.