Patent ID: 9105975
Filing Date: 2015-08-11
Classification: H01Q

Abstract:
1. An antenna device comprising: a casing; a circuit board that is provided in the casing and has a ground pattern; a first antenna element that includes a first conductor plate which is disposed in and near the casing and is conductive and substantially rectangular, a second conductor plate which shares one side of the first conductor plate in a widthwise direction thereof, is disposed on the first conductor plate at approximately 90 degrees, and is substantially rectangular, and a third conductor plate which shares the other side in the widthwise direction opposed to the one side of the second conductor plate shared with the first conductor plate, is disposed on the second conductor plate at approximately 90 degrees so as to be opposed to the first conductor plate, and is substantially rectangular, the first conductor plate being substantially parallel to the third conductor plate; and a second antenna element that includes a fourth conductor plate which is disposed in and near the casing and is conductive and substantially rectangular, a fifth conductor plate which shares one side of the fourth conductor plate in a widthwise direction thereof, is disposed on the fourth conductor plate at approximately 90 degrees, and is substantially rectangular, and a sixth conductor plate which shares the other side in the widthwise direction opposed to the one side of the fifth conductor plate shared with the fourth conductor plate, is disposed on the fifth conductor plate at approximately 90 degrees so as to be opposed to the fourth conductor plate, and is substantially rectangular, the fourth conductor plate being substantially parallel to the sixth conductor plate, wherein at least one slit with a predetermined length is provided in at least one of the first conductor plate, the second conductor plate, or the third conductor plate of the first antenna element, wherein the at least one slit with the predetermined length is provided in at least one of the fourth conductor plate, the fifth conductor plate, or the sixth conductor plate of the second antenna element, wherein the first antenna element and the second antenna element are disposed to be close to each other substantially in parallel with each other at a predetermined distance away from the ground pattern on the circuit board, and are electrically connected to a first power supply section and a second power supply section, which are disposed on the circuit board, at both ends of one side of the circuit board, and wherein a position and a length of the slit are adjusted such that mutual coupling between the first antenna element and the second antenna element in a first frequency band is canceled.