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首页> 外文学位 >Reconfigurable Wideband Circularly Polarized Microstrip Patch Antenna for Wireless Applications.
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Reconfigurable Wideband Circularly Polarized Microstrip Patch Antenna for Wireless Applications.

机译：用于无线应用的可重配置宽带圆极化微带贴片天线。

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摘要

In this thesis, developments of rectangular microstrip patch antenna to have circular polarization agility with wideband performance, for wireless applications are presented. First, a new technique to achieve circularly polarized (CP) probe feed single-layer microstrip patch antenna with wideband characteristics is proposed. The antenna is a modified form of the popular E-shaped patch, used to broaden the impedance bandwidth of a basic rectangular patch antenna. This is established by letting the two parallel slots of the E-patch unequal. Thus, by introducing asymmetry two orthogonal currents on the patch are excited and circularly polarized fields are realized. The proposed technique exhibits the advantage of the simplicity inherent in the E-shaped patch design. It requires only slot lengths, widths, and position parameters to be determined. Also, it is suitable for later adding the reconfigurable capability. With the aid of full-wave simulator Ansoft HFSS, investigations on the effect of various dimensions of the antenna have been carried out via parametric analysis. Based on these investigations, a design procedure for a CP E-shaped patch is summarized. Various design examples with different substrate thicknesses and material types are presented and compared, with CP U-slot patch antennas, recently proposed in the literature. A prototype has been constructed following the suggested design procedure to cover the IEEE 802.11b/g WLAN band. The performance of the fabricated antenna was measured and compared with the simulation results for the reflection coefficient, axial ratio, radiation pattern, and antenna gain. Good agreement is achieved between simulation and measured results demonstrating a high gain and wideband performance.;Second, a polarization reconfigurable single feed E-shaped patch antenna with wideband performance is proposed. The antenna is capable of switching from right-hand circular polarization (RHCP) to left-hand circular polarization (LHCP) and vice versa, with the aid of two RF PIN diodes that act as RF switches. The proposed structure which is simple; consists of a single-layer single fed radiating E-shaped patch and RF switch placed on each of its slots at an appropriate location. The design targets WLAN IEEE 802.11b/g frequency band (2.4- 2.5 GHz) as one example of the wireless applications. The idea is based on the first proposed design. In other words, if one of the switches is ON and the other is OFF, the two slot lengths will become effectively unequal and circular polarization will be obtained. If the states of the two switches are reversed, circular polarization with opposite orientation will be obtained at the same frequency band. Full-wave simulator Ansoft HFSS is again used for the analysis. Complete detailed DC biasing circuit of the switches for integration with the antenna is presented. Also, characterizations of the microwave components used in the biasing circuit are discussed. Antenna prototype has been fabricated and tested. Simulation results along with the measured one, for the reflection coefficient, axial ratio, radiation pattern, and antenna gain agree well, showing wide bandwidth and high gain for the two circularly polarized modes.
机译：本文提出了具有圆形极化敏捷性和宽带性能的矩形微带贴片天线的发展，用于无线应用。首先，提出了一种新的技术来实现具有宽带特性的圆极化（CP）探针馈电单层微带贴片天线。该天线是流行的E形贴片的改进形式，用于加宽基本矩形贴片天线的阻抗带宽。这是通过使E-patch的两个平行插槽不相等来建立的。因此，通过引入不对称性，在贴片上激发了两个正交电流，并实现了圆极化场。所提出的技术展现了E形贴片设计固有的简单优势。它仅需要确定插槽的长度，宽度和位置参数。同样，它适用于以后添加可重新配置的功能。借助于全波模拟器Ansoft HFSS，已通过参数分析对天线各种尺寸的影响进行了研究。基于这些研究，总结了CP E形贴片的设计程序。提出并比较了具有不同基板厚度和材料类型的各种设计实例，并将其与最近在文献中提出的CP U槽贴片天线进行了比较。按照建议的设计步骤构造了一个原型，以覆盖IEEE 802.11b / g WLAN频段。测量了所制造天线的性能，并与反射系数，轴比，辐射方向图和天线增益的仿真结果进行了比较。仿真结果与实测结果吻合良好，具有较高的增益和宽带性能。其次，提出了一种具有宽带性能的极化可重构单馈源E形贴片天线。借助两个用作RF开关的RF PIN二极管，该天线能够从右旋圆极化（RHCP）切换到左旋圆极化（LHCP），反之亦然。所建议的结构很简单；由一个单层单馈辐射E形贴片和RF开关组成，它们分别放置在每个插槽的适当位置。该设计针对WLAN IEEE 802.11b / g频段（2.4- 2.5 GHz），作为无线应用的一个示例。这个想法是基于第一个提出的设计。换句话说，如果一个开关为ON而另一个开关为OFF，则两个槽的长度实际上将变得不相等，并且将获得圆极化。如果两个开关的状态相反，则将在相同频带上获得相反方向的圆极化。全波模拟器Ansoft HFSS再次用于分析。给出了用于与天线集成的开关的完整详细直流偏置电路。此外，还讨论了偏置电路中使用的微波组件的特性。天线原型已经制造和测试。反射系数，轴比，辐射方向图和天线增益的仿真结果与实测值吻合得很好，显示出两种圆极化模式的宽带宽和高增益。

著录项

  • 作者

    Khidre, Ahmed.;

  • 作者单位

    The University of Mississippi.;

  • 授予单位 The University of Mississippi.;
  • 学科 Engineering Electronics and Electrical.;Physics Electricity and Magnetism.
  • 学位 M.S.
  • 年度 2012
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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