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首页> 外文期刊>International Journal of Microwave and Wireless Technologies >Synthesis of nonuniformly spaced linear array of parallel and collinear dipole with minimum standing wave ratio using evolutionary optimization techniques
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Synthesis of nonuniformly spaced linear array of parallel and collinear dipole with minimum standing wave ratio using evolutionary optimization techniques

机译：利用进化优化技术合成具有最小驻波比的平行和共线偶极子非均匀间隔线性阵列

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In this paper, the author proposes a method based on two recent evolutionary algorithms (EAS): particle swarm optimization (PSO) and differential evolution (DE) to design nonuniformly placed linear arrays of half-wavelength long dipoles. The objective of the work is to generate pencil beam in horizontal (for parallel array) and vertical (for collinear array) plane with minimum standing wave ratio (SWR) and fixed side lobe level (SLL). Dynamic range ratio (DRR) of current amplitude distribution is kept at a fixed value. Two different examples have been presented having different array alignments. For both the configurations parallel and collinear, the excitation distribution and geometry of individual array elements are perturbed to accomplish the designing goal. Coupling effect between the elements is analyzed using induced electromotive force (EMF) method and minimized in terms of SWR. Numerical results obtained from both the algorithms are statistically compared to present a comprehensive overview. Beside this, the article also efficiently computes the trade-off curves between SLL, beam width, and number of array elements for nonuniformly spaced parallel array. It featured the average element spacing versus SWR curve for nonuniformly separated arrays. Furthermore, minimum achievable SLL performances of uniformly and nonuniformly spaced parallel arrays are compared for same average spacing in the proposed work.
机译：在本文中，作者提出了一种基于两种最新进化算法（EAS）的方法：粒子群优化（PSO）和差分进化（DE），以设计非均匀放置的半波长长偶极子线性阵列。这项工作的目的是在水平（对于平行阵列）和垂直（对于共线阵列）平面中产生铅笔束，并具有最小驻波比（SWR）和固定旁瓣电平（SLL）。电流幅度分布的动态范围比（DRR）保持固定值。已经提出了具有不同的阵列排列的两个不同的例子。对于平行和共线的配置，单个阵列元素的激发分布和几何形状都会受到干扰，从而达到设计目标。使用感应电动势（EMF）方法分析元素之间的耦合效应，并在SWR方面使其最小。从两种算法获得的数值结果进行统计比较，以提供全面的概述。除此之外，本文还有效地计算了非均匀间隔平行阵列的SLL，光束宽度和阵列元素数量之间的折衷曲线。它具有非均匀分离阵列的平均元素间距与SWR曲线的特征。此外，在拟议的工作中，对于相同的平均间隔，比较了均匀间隔和非均匀间隔的并行阵列的最小可实现SLL性能。

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