| 摘要 |
An antenna, which has a configuration small in size without degrading an antenna property is provided. An antenna 10 includes a power feeding waveguide 14, a sub reflection mirror 12, and a main reflection mirror 11. Radio waves comprised of a vertical polarized wave and a horizontal polarized wave are transmitted to the power feeding waveguide 14. The sub reflection mirror 12 is disposed to face an opening of the power feeding waveguide 14 and reflects the radio wave radiated from the opening. The main reflection mirror 11 is disposed to face the sub reflection mirror 12 and outwardly radiates the radio wave reflected by the sub reflection mirror 12. A front surface of the main reflection mirror 11 has a shape formed by rotating a line reaching one side and the other side of a predetermined parabola curve at least once, around a rotational axis. A front surface of the sub reflection mirror 12 has a shape formed by rotating either one of a stepped line and a wavy line around the rotational axis. |
