Antenna device

A waveguide array antenna apparatus comprising a plurality of waveguide antenna units provided on a ground conductor, each of the waveguide antenna units including a rectangular waveguide and an antenna element,

• wherein each of the rectangular waveguides comprises the ground conductor, a ceiling conductor facing the ground conductor, and two side conductors that connect the ground conductor with the ceiling conductor and face each other, and has one end short-circuited by a terminating conductor and an open end, the open ends of the respective rectangular waveguides are arranged on corresponding sides of a polygon on the ground conductor having sides of the same number as that of the rectangular waveguides, the rectangular waveguides extend outward from the corresponding sides of the polygon on the ground conductor, and at least one of the rectangular waveguides comprises at least one slot formed in the ceiling conductor in a width direction of the rectangular waveguide,
• wherein one ends of the respective antenna elements are electrically connected to the ceiling conductors in vicinity of the open ends of the respective rectangular waveguides, and another ends thereof are electrically connected to each of a plurality of feeding points arranged on the ground conductor, and
• wherein the waveguide antenna units respectively transmit and receive the radio signal using a predetermined directivity characteristic at the open ends of the rectangular waveguides constituting the waveguide antenna units.

A waveguide array antenna apparatus comprising a plurality of waveguide antenna units provided on a ground conductor, each of the waveguide antenna units including a rectangular waveguide and an antenna element,

• wherein, each of the rectangular waveguides comprises the ground conductor, a ceiling conductor facing the ground conductor, and two partitioning-wall conductors that connect the ground conductor with the ceiling conductor and face each other, the rectangular waveguides are arranged in such manner that the partitioning-wall conductors are respectively shared between the two rectangular waveguides adjacent to each other, each of the rectangular waveguides has one end short-circuited by a terminating conductor and an open end, the open ends of the respective rectangular waveguides are arranged on corresponding sides of a polygon on the ground conductor having sides of the same number as that of the rectangular waveguides, and the rectangular waveguides extend outward from the corresponding sides of the polygon on the ground conductor,
• wherein one ends of the respective antenna elements are electrically connected to the ceiling conductors in vicinity of the open ends of the respective rectangular waveguides, and another ends thereof are electrically connected to each of a plurality of feeding points arranged on the ground conductor, and
• wherein the waveguide antenna units respectively transmit and receive the radio signal using a predetermined directivity characteristic at the open ends of the rectangular waveguides constituting the waveguide antenna units.

A waveguide array antenna apparatus comprising a plurality of waveguide antenna units provided on a ground conductor, each of the waveguide antenna units including a rectangular waveguide and an antenna element,

• wherein each of the rectangular waveguides comprises the ground conductor, a ceiling conductor facing the ground conductor, and two partitioning-wall conductors that connect the ground conductor with the ceiling conductor and face each other, the rectangular waveguides are arranged in such manner that the partitioning-wall conductors are respectively shared between the two rectangular waveguides adjacent to each other, each of the rectangular waveguides has one end short-circuited by a terminating conductor and an open end, the open ends of the respective rectangular waveguides are arranged on corresponding sides of a polygon on the ground conductor having sides of the same number as that of the rectangular waveguides, the rectangular waveguides extend outward from the corresponding sides of the polygon on the ground conductor, and at least one of the rectangular waveguides comprises at least one slot formed in the ceiling conductor in a width direction of the rectangular waveguide,
• wherein one ends of the respective antenna elements are electrically connected to the ceiling conductors in vicinity of the open ends of the respective rectangular waveguides, and another ends thereof are electrically connected to each of a plurality of feeding points arranged on the ground conductor, and
• wherein the waveguide antenna units respectively transmit and receive the radio signal using a predetermined directivity characteristic at the open ends of the rectangular waveguides constituting the waveguide antenna units.