| 摘要 |
PURPOSE:To realize both miniaturization and broad band by providing a conductor projection to convert a linearly polarized wave into a circularly polarized wave to an inner wall of a horn antenna. CONSTITUTION:Conductor projections 30, 31 made of copper, silver or aluminum are provided along the inner wall of the horn antenna 1. The conductor projections 30, 31 are provided in opposition to one electric field of orthogonal electric fields E1, E2 of an electric field E incident on a feeding end 50 of the antenna 1, e.g., the E1. The thickness and length of the conductor projections 30, 31 are selected so as to obtain a desired circularly polarized wave. Since it is not required to provide a circularly polarized wave generator in this way, the axial length is shortened and the shape is miniaturized. Since the horn antenna is used as a waveguide for a circularly polarized wave device, the diameter is large and broad band is realized easily without large-sized configuration as conventional radiators.
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