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    • 1. 发明专利
    • Antenna device
    • 天线设备
    • JPS5744302A
    • 1982-03-12
    • JP11998880
    • 1980-08-28
    • Mitsubishi Electric Corp
    • BETSUDAN SHINICHIAOKI KATSUHIKOSATOU SHIGERUKATAKI TAKASHI
    • H01P3/20H01Q3/24H01Q5/00H01Q15/23H01Q19/17H01Q19/18H01Q19/19H01Q21/28
    • H01Q19/191H01Q3/245H01Q5/45H01Q19/17H01Q19/18H01Q19/19
    • 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.
    • 目的:通过由由两个会聚反射镜组成的收敛蜂进给系统产生的交叉极化波,通过使用旋转不对称的从属反射镜来消除交叉极化波,以防止指向性精度和降低增益。 构成:当入射到会聚反射镜9a和12a以及从属反射镜2a和2b及其反射的无线电波的无线电波的角度是δ1,delta2和delta3时,反射镜的光束半径为ω1,ω2和ω3,焦点 长度为f1,f2和f3,由旋转非对称镜面系统产生的交叉极化波电平C如下式所示,其中Di是每个反射镜的直径,L是每个反射镜的边缘电平,Ri 入射到每个反射镜的波的表面的曲率半径,以及Ri'是从每个反射镜反射的波面的曲率半径。 在该系统中,将Di,fi,omegai和deltai设置为频率为f2的适当值导致C = 0。 即,得到没有交叉偏振波分量的系统。