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Planar leaky-wave antenna designs for directive beam scanning.

机译：用于定向波束扫描的平面泄漏波天线设计。

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摘要

Various high gain LW antenna designs have been investigated for satellite and radar applications at millimeter frequencies. By using cylindrical surface-wave (SWs) on a grounded dielectric slab (GDS) and by the addition of appropriate metallic grating or strips, leaky-waves (LWs) can be excited. Four continuous strip gratings are measured and theoretically investigated achieving backward and forward beam scanning as a function of frequency. These designs display a LW stopband at broadside. Conversely, directive broadside radiation is achieved with a segmented circular strip grating.;In addition, an arrayed configuration of SWLs is also investigated for SW beam scanning. By variation of the relative phase difference between SWL elements the SW fields can be steered into different regions on the GDS. A two element array of SWLs is developed and the results are extended to a six element design with non-uniform weighting. This controlled SW excitation can also dictate the region of LW field generation on the guiding surface, steering directive beam patterns at a single frequency in the far field. Three specific grating configurations are presented: an elliptical and asymmetrical grating followed by a segmented strip design.;Yagi-Uda like surface-wave launchers (SWLs) are utilized as the antenna feed which generate a bound cylindrical T M0 SW mode on the GDS. Essentially, ground plane slots define these SWLs and the configurations act as magnetic dipole sources for the investigated LWA designs. Such guided SWs on planar substrates are generally an adverse effect that can degrade the performance of monolithic integrated circuits and antenna arrays at millimeter wave frequencies. However, with appropriate boundary conditions and substrate characteristics, the T M0 SW mode can be harnessed as an efficient means of power transport and thus a novel planar antenna feeding technique. Specifically, two types of SWL antennas are examined for unidirectional and bidirectional SW beam patterns on the guiding surface; unidirectional SWs are produced by directive SWLs and bidirectional SWs are driven by non-directive SWLs.
机译：已经针对毫米频率的卫星和雷达应用研究了各种高增益LW天线设计。通过在接地的电介质平板（GDS）上使用圆柱形表面波（SW）并通过添加适当的金属光栅或条带，可以激发泄漏波（LW）。测量并理论上研究了四个连续的条形光栅，以实现作为频率函数的后向和前向光束扫描。这些设计在宽边显示了一个低带宽阻带。相反，使用分段的圆形条状光栅可以实现定向的宽边辐射。此外，还研究了SWL的阵列配置用于SW光束扫描。通过改变SWL元件之间的相对相位差，可以将SW场控制到GDS上的不同区域。开发了两个元素的SWL数组，并将结果扩展到具有非均匀加权的六个元素设计。这种受控的SW激励还可以指示在引导表面上产生LW场的区域，从而在远场中以单个频率操纵定向波束图案。提出了三种特定的光栅配置：椭圆形和不对称光栅，然后是分段带状设计。；像Yag-Uda一样的表面波发射器（SWL）被用作天线馈源，在GDS上生成绑定的圆柱T M0 SW模式。本质上，接地平面槽定义了这些SWL，并且这些配置充当了研究的LWA设计的磁偶极子源。在平面基板上的这种引导的SW通常是不利的影响，其可能使毫米波频率下的单片集成电路和天线阵列的性能下降。但是，在适当的边界条件和基板特性的情况下，可以将T M0 SW模式用作功率传输的有效手段，从而可以采用新颖的平面天线馈电技术。具体来说，检查了两种类型的SWL天线在引导表面上的单向和双向SW波束方向图；单向SW由指令SWL产生，而双向SW由非指令SWL驱动。

著录项

  • 作者

    Podilchak, Symon K.;

  • 作者单位

    Royal Military College of Canada (Canada).;

  • 授予单位 Royal Military College of Canada (Canada).;
  • 学科 Engineering Electronics and Electrical.;Physics Radiation.
  • 学位 M.A.Sc.
  • 年度 2008
  • 页码 231 p.
  • 总页数 231
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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