| 摘要 |
PURPOSE:To propagate the diffracted wave from a reflection mirror into only two planes to improve a high angle radiation characteristic in the other range by providing a specific electromagnetic wave shielding plate around the relfection mirror. CONSTITUTION:Electromagnetic wave shielding plate 3 consisting of a metallic plate, metallic meshes or electromagnetic wave absorbing materials is provided around reflection mirror 1 and is provided in the plane which is orthogonal or approximately orthogonal to the advance direction of the incident wave, and the shape of edge 4 of shielding plate 3 is formed by combining lines which are parallel to two specific directions in the plane respectively. The advance direction of the incident wave is parallel to the Z axis, and shielding plate 3 is in the X-Y plane. The diffracted wave diffracted from edges 4a and 4b is propagated only into the Y-Z plane and the X-Z plane. |
