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一、引言常用的对称抛物面天线中抛物面的反射引起馈源喇叭驻波特性的恶化,其馈源系统和它的支撑结构的阻挡引起增益和波束效率的下降及旁瓣电平和交叉极化电平的提高。偏置抛物面天线可避免上述反射和阻挡,但它的不对称性却引起旁瓣电平和交叉极化电平的提高。适当选取天线系统的参数或选用与焦面场匹配的多喇叭作馈源或适当选取双偏置反射面天线的参数,仍可使偏置抛物面天线系统不仅保持无阻挡、低反射的特性,而且具有低旁瓣、低交叉极化的特性。一般说偏置反射面天线的电性能总比对称反射面天线的要好。它在空间探
I. INTRODUCTION The reflection of the parabolic surface of commonly used symmetrical parabolic antennas causes deterioration of the standing wave characteristics of the feed horn and the blockage of its feed system and its supporting structure causes a drop in gain and beam efficiency and sidelobe level and cross-polarization Flat increase. Bias parabolic antennas avoid the above reflections and obstructions, but their asymmetries introduce sidelobe and cross-polarization levels. Appropriate selection of the parameters of the antenna system or the selection of multi-horn matching with the focal plane field as the feed source or the proper selection of the parameters of the dual-bias reflecting plane antenna can not only keep the bias parabolic antenna system unblocked and have low reflection characteristics, Low side lobe, low cross-polarization characteristics. In general, the electrical properties of the biased reflector antenna are better than those of the symmetrical reflector antenna. It is in space exploration