| 摘要 |
PURPOSE:To eliminate a phase frequency characteristics of a primary radiator by combining frequency selectivity reflecting mirror (FSR) to a part or all of sub-reflecting mirrors. CONSTITUTION:When a radio wave 6a with f=f1 and a radio wave 6b of f=f2 are irradiated from the center of phase 5 toward a sub reflecting mirror 2 and the FSR11, the radio wave 6a of f=f1 is transmitted independently of the FSR11 and reaches the sub-reflecting mirror 2, is reflected at a point 12a of a reflecting face 10 and transmitted again through the FSR11 and goes to a main reflecting mirror. On the other hand, a ray 6b of f=f2 is reflected at a reflecting point 12b of the FSR11 and goes toward the sub-reflecting mirror. In selecting the shape of the FSR11 so as to make phase characteristic with f=f2 nearly flat, the phase characteristic at two frequencies f=f1, f=f2 in common is made nearly identical. |
