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偏置抛物面反射器天线结构简单,能够降低广角旁办,因而它作为能够处理无线电通信线路高密度化的天线,是有发展前途的。但是,它也有随着低旁办化效率明显降低和在水平面内产生高的交叉极化峰值的缺点。因此,本文新提出了一种采用多喇叭的一次辐射系统的方法,它既能保持低旁办特性和提高效率,同时又能改善交叉极化特性。关于典型的双喇叭的情况,本文通过对一次辐射系统进行设计,根据放射特性的实测值和计算值确认了该设计的稳妥性。并基于这种一次辐射系统的特性,通过计算评价了天线特性。结果,与单一喇叭馈电的情况相比,在10%的带宽上,增益可改善1.2dB;交叉极化峰值可改善6dB。
Bias parabolic reflector antenna structure is simple, can reduce the wide-angle bypass, so as it can deal with the high density of radio communications antenna, there is a promising future. However, it also has the disadvantage of a markedly lower efficiency and a high cross-polarization peak in the horizontal plane. Therefore, this paper presents a new method of using a multi-horn primary radiation system, which not only maintains the low bypass feature and improve efficiency, while improving cross-polarization characteristics. In the case of a typical two-horn system, we design a primary radiation system and verify the robustness of the design based on measured and calculated radiation characteristics. Based on the characteristics of this primary radiation system, the antenna characteristics were evaluated. As a result, the gain can be improved by 1.2 dB at 10% bandwidth compared with the single-horn feed; the cross-polarization peak can be improved by 6 dB.