Study of Ultra-High Efficiency Planar Antennas

这项研究的目的是建立一种放射线槽天线（RLSA's）的设计方法，它是一种高收益和高效率的行星阵列。它涉及以下方面的研究：（a）循环和线性极化RLSA的插槽安排;（b）效率优化（> 80%）;（c）低成本和质量可生产的结构。关键技术在这里可用的现场分析，以估计槽耦合到不同的径向波，如良好地反射形成饲料结构。后续的结果已获得.1.饲料结构的形状在数值上是最优化的，整个天线反射都得到了抑制--17分贝。在双重-分层的RLSA与统一的插槽，插槽长度和空间是最优化的实验。75%的天线效率在36.3 dBi的增益上被现实化，两次比常规行星阵列高。插槽和径向波之间的配对，是用瞬间方法分析的。它可以通过不同的槽长度和间隔来控制光圈照明。来自插槽的反射也可以基于此分析进行评估和抑制。单-分层RLSA的尺寸为25至60厘米，在直径上设计为基础。它的出色效率约为80%是真实的。这些在成本和质量的条款中也很有吸引力-生产性和现在使用的商业惯例。线性-极化RLSA已提议进行剖面排列，并获得48%的有效性。带宽宽度宽，再利用终止丧失了电力和技术以用于倾斜-光束和双重-极化仍有待进一步的研究。

The purpose of this study is to establish a design method of radial line slot antennas (RLSA's), which are high gain and high efficiency planar arrays. It consists of researches for (a) slot arrangement for circularly- and linearly-polarized RLSA's, (b) efficiency optimization (>80%) and (c) low-cost and massーproducible structure. Key technology utilized here is the field analysis to estimate the slot coupling to aversized radial waveguide as well as the reflection form the feeding structure. Following results were obtained.1. The shape of the feeding structure was numerically optimized and the overall antenna reflection was suppressed below ー17dB.2. In doubleーlayered RLSA with uniform slots, the slot length and the spacings were optimized experimentally. The antenna efficiency of 75% at the gain of 36.3dBi was realized, which is twice as high as that of conventional planar arrays.3. The coupling between slots and the radial waveguide, was analyzed by moment method. It enables the aperture illumination control by varying the slot length and the spacing. Reflection from slots can also be evaluated and suppressed based upon this analysis.4. Singleーlayered RLSA's of 25 to 60cm in diameter, were designed based upon 3. The excellent efficiency of about 80% were realized. These are also very attractive in terms of cost and massーproducibility and are now used commercially.5. Slot arrangement for linearlyーpolarized RLSA was proposed and the efficiency of 48% was observed.The bandwidth widening, reuse of the termination loss power and techniques for tiltedーbeam and dualーpolarization are left for further study.