A hybrid optimization method to analyze metamaterial-based electrically small antennas
A hybrid optimization method to analyze metamaterial-based electrically small antennas
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DOI：
10.1109/tap.2007.891553
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发表时间：
2007-03-01
影响因子：
5.7
通讯作者：
Ziolkowski, Richard W.
中科院分区：
文献类型：
--
作者：
Erentok, Aycan;Ziolkowski, Richard W.
从解析角度建立了一个理想化辐射系统模型，该系统由置于电小多层超材料壳层系统内的电小电偶极子天线组成。利用基于遗传算法和MATLAB的混合优化模型对该系统的远场辐射特性进行了优化。将优化解析模型具体应用于填充“冷等离子体”负介电常数（ENG）介质的球形玻璃壳。这些解析结果通过ANSYS HFSS和COMSOL Multiphysics仿真得到了验证；这些数值结果包括解析模型无法提供的输入阻抗和总效率值。优化解析模型还用于实现基于电小非辐射超材料的多层球形壳设计。利用优化后的壳层特性来获得多频带辐射和非辐射响应特性。所有解析模型中还包含了ENG材料的色散特性，并对这些系统的带宽特性进行了讨论。
A model of an idealized radiating system composed of an electrically small electric dipole antenna enclosed in an electrically small multilayered metamaterial shell system is developed analytically. The far-field radiation characteristics of this system are optimized using a GA-MATLAB based hybrid optimization model. The optimized-analytical model is specifically applied to a spherical glass shell filled with a "cold plasma" epsilon-negative (ENG) medium. These analytical results are confirmed using ANSOFT HFSS and COMSOL Multiphysics simulations; these numerical results include input impedance and overall efficiency values not available with the analytical model. The optimized-analytical model is also used to achieve electrically small nonradiating metamaterial-based multilayered spherical shell designs. The optimized shell properties are exploited to,obtain multiband radiating and nonradiating response characteristics. Dispersion properties of the ENG materials are also included in all the analytical models; the bandwidth characteristics of these systems are discussed.