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随着对阵列天线应用的增加 ,低剖面、高性能、重量轻的阵列的设计引起了人们广泛的兴趣。在这篇文章中 ,我们描述了一个平板阵列的开发 ,它是由 ERA公司的 ESA资助下开发出来的 ,其目的是提供一个最终可工作于太空中的 Ku波段的双线性极化天线。关键的性能要求是要有类似于普通的喇叭天线的交叉极化水平 ,并且要效率高。经过对可能的阵列单元和馈线系统详细的研究 ,构造出一个用小波导口径组成的阵列原型 ,设计的小波导口径利用相互耦合的作用使口径效率提高了 81%以上 ,是普通喇叭天线所预期的最大值。口径是通过一对低损耗、悬吊的带状线网络给一个 8× 12的单元阵列提供均匀激励来馈电的 ,网络一个在一个后面放置 ,用一个普通的短路电路使它们相互匹配。阵列由 2× 2的子阵列组成 ,每一个子阵列采用一种新型几何形状的馈源构成 ,以抵消馈源探针之间的交叉耦合 ,阵列的总厚度大约是一个 λ。原型天线经过特性检测 ,取得了很好的效果 ,在主波束 - 1d B点范围内两端口的交叉极化辐射低于 35 d B,端口与端口之间的隔离度低于 6 0 d B。同极辐射方向图显示了非常易于控制的响应 ,测得的效率约为 80 %。若不考虑馈源大约 0 .5 d B的损耗 ,阵列的口径效率大约为 95 %。
With the increasing use of array antennas, the design of low-profile, high-performance, light-weight arrays has drawn widespread interest. In this article, we describe the development of a flat panel array, funded by ERA’s ESA, for the purpose of providing a bilinear polarized antenna in the Ku band that will ultimately work in space. The key performance requirement is to have a level of cross-polarization similar to that of a normal horn antenna and to be highly efficient. After a detailed study of possible array elements and feeder systems, an array prototype with a small waveguide diameter was constructed. The design of a small waveguide diameter aperture increased the aperture efficiency by more than 81% through mutual coupling, which is the expectation of the ordinary horn antenna The maximum value. The aperture is fed through a pair of low-loss, suspended stripline networks to provide a uniform excitation of an array of 8x12 cells, one behind the other, matched with a common short circuit. The array is made up of 2 × 2 subarrays, each of which uses a new geometry feed to counteract the cross-coupling between the feed probes. The total thickness of the array is about λ. Prototype antenna through the characteristics of detection, and achieved good results, the main beam - 1d B-point cross-polarized radiation at both ports below 35 d B, port and port isolation between less than 60 d B. The same-pole radiation pattern shows a very easy-to-control response with a measured efficiency of about 80%. Without accounting for a loss of about 0.5 dB from the feed, the array’s aperture efficiency is approximately 95%.