| 摘要 |
An antenna device is provided to withstand wind pressure and to improve a front to back characteristic by receiving an array antenna and a reflector in a resin radome as one body. An antenna device(100) includes an array antenna(25) and a reflector(60). The array antenna is formed by arranging a plurality of antenna elements(20) on one surface of a rectangular ground plate(10) composed of short and long sides. The reflector has conductive material with a semi-circular arc-shaped cross section. In the conductive material, a width between parallel linear ends, which corresponds to an arc of the cross section, is longer than the short side of the ground plate. The array antenna is arranged so that the other surface of the ground plate faces an inner wall of a concave unit of the reflector, while the ground plate is placed on the same or almost same plane as each of the linear ends of the reflector.
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