| 摘要 |
PURPOSE:To prevent directivity precision and gain from lowering by canceling a cross-polarized wave due to the use of a rotationally asymmetric subordinate reflecting mirror by a cross-polarized wave generated by a convergent beem feed system consisting of two convergent reflecting mirrors. CONSTITUTION:When angles that radio waves incident to convergent reflecting mirrors 9a and 12a and subordinate reflecting mirrors 2a and 2b and their reflected radio waves contain are delta1, delta2 and delta3, beam radii of the reflecting mirrors are omega1, omega2 and omega3, and focal lengths are f1, f2 and f3, a cross-polarized wave level C generated by the rotationally asymmetric mirror surface system is as shown by the equation, where Di is the diameter of each reflecting mirror, L the edge level of each reflecting mirror, Ri the radius of curvature of the surface of the wave incident to each reflecting mirror, and Ri' the radius of curvature of the surface of wave reflected from each reflecting mirror. In this system, setting the Di, fi, omegai, and deltai to adequate values at a frequency f2 results in that C=0. Namely, a system having no cross-polarized wave component is obtained. |
