加载线栅复合天线基板的建模与分析
Modeling and Analysis of Composite Antenna Superstrates Consisting on Grids of Loaded Wires
摘要：
研究了周期性密集网格加载天线基板的特性和辐射机理。基于局域场方法的显式分析方法被用来研究这种覆盖层的反射和透射特性。它示出，作为适当的阻抗加载的结果，存在一个相当宽的频带，在该频带上，感应到网格的电流相互抵消，导致宽的传输最大值。在这种情况下，辐射是由网格中流通的异相电流产生的磁偶极矩产生的。的阻抗矩阵表示推导出的superstrates，和分析结果进行了验证，使用全波模拟。作为一个实际应用的例子，我们数值研究了偶极天线照射有限尺寸衬底的辐射特性。
英文摘要：
We study the characteristics and radiation mechanism of antenna superstrates based on closely located periodical grids of loaded wires. An explicit analytical method based on the local field approach is used to study the reflection and transmission properties of such superstrates. It is shown that as a result of proper impedance loading there exists a rather wide frequency band over which currents induced to the grids cancel each other, leading to a wide transmission maximum. In this regime radiation is produced by the magnetic dipole moments created by circulating out-of-phase currents flowing in the grids. An impedance matrix representation is derived for the superstrates, and the analytical results are validated using full-wave simulations. As a practical application example we study numerically the radiation characteristics of dipole antennas illuminating finite-size superstrates.
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