摘要
共形天线及其阵列在结构上能很好地满足空气动力学的要求,因此它们在飞机、导弹、火箭等空天飞行器中独具优势。本文围绕共形辐射单元及其阵列的分析与设计展开了一系列的研究。
在第一章,介绍了共形天线及其阵列的研究背景和最新进展;概述了共形天线及其阵列的分析方法和设计方法。
在第二章,首先建立了任意曲面共形阵列的远场计算公式体系:接着,将有源单元方向图技术用于考虑单元互耦效应的共形阵列的分析之中,从而把大型阵列的分析问题化为若干简化了的小型阵列问题的叠加,大大减小了计算量。当阵列单元数目巨大而其它方法受计算机硬件条件限制无法使用时,本文所建议的方法能有效地发挥作用。
在第三章,研究了辐射单元的宽带特性和可重构特性,提出并设计了一种新型的宽带双折叠槽天线、一种带有集成巴伦馈电的双频宽带印刷天线和一种方向图可重构的双折叠槽天线。
在第四章,基于上述远场公式和新型辐射单元,研究了共形阵列的远场辐射特性,并进一步提出了新的低副瓣阵列综合方法;最后,基于可重构单元,提出了一种克服共形阵列曲率半径影响阵列辐射方向图的新方法。
在第五章,对本论文进行了总结,并提出了进一步的研究课题。
Conformal antenna and arrays have some particular advantages on the aerocrafts such as airplanes, missiles, rockets and so on, because their configurations are suited for aerodynamics demands. Researches on the analysis and design methods of conformal antenna and arrays have been done in this dissertation.
In Chapter 1, the research background and recent developments about conformal antenna and arrays are reviewed, and then the analysis and design methods are summarized.
In Chapter 2, general far-field formulations for arrays conformed with arbittary curved surface are developed at first. Then active element pattern technique is applied to the analyzing of conformal arrays with element coupling, which divides a large array analysis problem as a superposition of various simplified small array problems and greatly reduces the computation burden. The proposed new method is effective when the number of array elements is enormous and the other methods become incapable due to computer hardware limitation.
In Chapter 3, the wideband traits and reconfigurable characteristics of radiating elements are investigated. A novel wideband double folded-slot antenna, a wideband and dual-band printed antenna with an integrated balun, and a pattern reconfigurable double folded-slot antenna are proposed and designed.
In Chapter 4, based on the general far-field formulations and novel radiating elements mentioned above, far-field radiating characteristics of conformal arrays are reseached. And then, novel synthesis methods for low sidelobe arrays are proposed. Finally, a new approach, which is based on reconfigurable elements, for overcoming the influence of structure curvature on the array properties is proposed and researched.
In Chapter 5, a summary of the whole dissertation is given, and future research topics are suggested.
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