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1、前言我们知道抛物面反射器天线和卡塞格伦天线具有园形反射镜,它作为孔径面天线,适于发射,接收微波波段以上的电波。在这些天线中,使电波从波导发射到空间用的1次辐射器与使电波缩为窄波束用的主反射器或电波从通道折射用的付反射镜围绕天线波束轴呈对称性结构。因此,1次辐射器和付反射镜就遮蔽(阻塞)了主反射镜发射到空间的电波,成为损耗电波、向不需要方向散射的原因。对此,最近对图1所示的使1次幅射器到反
1, Foreword We know that the parabolic reflector antenna and the Cassegrain antenna have a circular mirror, which is used as an aperture antenna for transmitting and receiving radio waves above the microwave band. Among these antennas, a primary radiator for radiating a radio wave from a waveguide to a space and a main reflector for narrowing the radio wave to a narrow beam or a deflector mirror for radiating a radio wave from a channel have a symmetrical structure about an antenna beam axis. Therefore, the primary radiator and the secondary reflector shield (block) the radio waves that the primary reflector emits to the space and become the cause of the loss of radio waves and scattering in the unnecessary direction. In response to this, the first shown in Figure 1 to the first radiator to the reverse