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Designs and optimizations for a series-fed, broadband impedance-matched, end-fire linear antenna array.

机译：串联馈电，宽带阻抗匹配，端射线性天线阵列的设计和优化。

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摘要

The main goal of this research is to obtain input impedance matching over a wide range of frequencies for a linear array of antennas. The basic structure of the array is to connect element antennas connected with quarter-wavelength transmission lines. The motivation for studying this structure is that broad matching bandwidth along with an end-fire radiation pattern might be achieved by using the maximums band-width (MBW) algorithm. In theory, assuming that a dipole antenna in an antenna array is represented by an RLC circuit, the dipole array can be represented as an impedance network. The impedance network could show that a wide bandwidth along with a high gain of the antenna may be yielded by tuning out the inner resonant characteristics of the resistor network. Numerical Electromagnics Code (NEC2) is used to simulate thin-wire dipole arrays. The matching performance of a thin-wire dipole array may be optimized by adjusting certain parameters of the dipole arrays, such as the length of the dipoles, the characteristic impedances of the transmission lines, the length of the transmission lines, and relative tuning of element antennas. To achieve the desired bandwidth and radiation pattern, the optimization of the antenna array widely depends upon the genetic algorithm (GA), and on the Butter-worth, equi-ripple and Chebyshev design algorithms. Some antenna arrays will be designed and tested by using the optimized parameters. According to the different definitions of the fitness functions F and bandwidth, several simulation results show that the bandwidth can be broader after the genetic optimizations, while the designed reflection coefficients rho are much flatter or lower in a large frequency range.; Dipoles on twin rods with microstrip transmission lines were explored. Compared with Yagi-Uda array designs, these dipole arrays showed improvements on matching performance.
机译：这项研究的主要目标是在线性天线阵列的宽频率范围内获得输入阻抗匹配。阵列的基本结构是连接与四分之一波长传输线相连的元件天线。研究这种结构的动机是，可以通过使用最大带宽（MBW）算法来实现较宽的匹配带宽以及端射辐射图。从理论上讲，假设天线阵列中的偶极天线由RLC电路表示，则偶极阵列可以表示为阻抗网络。阻抗网络可以表明，通过调整电阻器网络的内部谐振特性，可以得到宽带宽以及天线的高增益。数值电子代码（NEC2）用于模拟细线偶极子阵列。细线偶极子阵列的匹配性能可以通过调整偶极子阵列的某些参数来优化，例如偶极子的长度，传输线的特征阻抗，传输线的长度以及元件的相对调谐天线。为了获得所需的带宽和辐射方向图，天线阵列的优化很大程度上取决于遗传算法（GA），以及Butter-worth，equip-ripple和Chebyshev设计算法。某些天线阵列将通过优化参数进行设计和测试。根据适应度函数F和带宽的不同定义，一些仿真结果表明，遗传优化后带宽可以更宽，而设计的反射系数rho在较大的频率范围内要平坦得多或更低。探索了具有微带传输线的双杆上的偶极子。与八木宇田阵列设计相比，这些偶极阵列显示出匹配性能的提高。

著录项

  • 作者

    Xie, Zhentian.;

  • 作者单位

    Duke University.;

  • 授予单位 Duke University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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