| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antenna device for dual polarization that is lighter than before, keeps rigidity intact, keeps performance substantially intact, and costs less than before in various phases.SOLUTION: An antenna device 10 includes: a reflector 12 including a concave surface 12a for reflecting radio waves, a rear surface 12b opposite to the concave surface, a radio axis 12c of the radio waves reflected by the concave surface, and a focal position 12d of the concave surface; a radiator 14 arranged in the focal position to at least either transmit or receive two linearly polarized radio waves orthogonal to each other toward the concave surface or from the concave surface; and a structural unit 16 for supporting the radiator in the focal position. Two planes of linear polarization 20a, 20b are defined on the concave surface by the two linearly polarized waves. The structural unit includes a body protruding from the rear surface of the reflector into a radiation space 18 defined between the concave surface and the radiator in a position on the concave surface apart from the two planes of linear polarization.</p> |
