Highly Directive Array Pattern Synthesis in Different phi Planes of a Large CCRAA Using Array Thinning Technique

Abstract

This paper presents a pattern synthesis method of a sizeable concentric circular ring array (CCRAA) of isotropic antennas using Evolutionary Algorithms. In this method, the array is thinned using the optimum set of binary excitations to achieve the desired highly directive pencil beam patterns with lower peak side lobe level(SLL). The half-power beam width and first null beam width is kept constant to obtain such highly directive beam patterns with lower peak SLL. This pattern is not synthesized to a particular azimuth plane rather in four different ' planes from entire azimuth planes. The isotropic elements are uniformly spaced in the concentric ring. The achieved set of optimum amplitudes are constructed with either 1 or 0 using Differential Evolutionary Algorithm(DE), Genetic Algorithm (GA), and Particle Swarm Optimization Algorithm (PSO). These excitations show the state of the elements. The elements are in “ON” state or in “OFF” state depending upon the excitation ‘1’ or ‘0’. It is also helpful to reduce the complexity of the feed networks. The excitations are also verified in the whole range (0o

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利用阵列细化技术合成大型CCRAA不同phi平面的高定向阵列方向图

提出了一种基于进化算法的大尺寸同心圆环形天线阵方向图合成方法。在该方法中，使用最佳的二进制激励集对阵列进行减薄，以获得所需的具有较低峰值旁瓣电平(SLL)的高度指向性的铅笔束模式。保持半功率波束宽度和第一零波束宽度不变，以获得具有较低峰值SLL的高度指向性的波束图。这种模式不是合成到一个特定的方位角平面，而是从整个方位角平面合成到四个不同的方位角平面。各向同性元素在同心圆内均匀间隔。利用差分进化算法(DE)、遗传算法(GA)和粒子群优化算法(PSO)，分别以1或0构建了所获得的最优振幅集。这些激发显示了元素的状态。元件处于“开”状态或“关”状态取决于激励“1”或“0”。这也有助于降低馈电网络的复杂性。通过任意选择4个phi平面，在整个平面(0

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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