基于矩量法的分形环八木天线的特性分析

八木天线是一种常用的天线形式.本文将Minkowski分形环应用于八木天线设计中,利用分形结构的空间填充特性来减小天线的横向尺寸,从而实现天线小型化设计.设计了工作于880～960MHz的6元二阶Minkowski分形环八木天线,以矩量法为核心对设计天线进行数值分析,将线天线模拟为细带线模型,天线表面采用三角单元进行剖分,RwG基函数作为电流展开函数.同方环八木天线进行了比较,在驻波特性、辐射特性相似情况下,分形环八木天线的尺寸缩减了29.8%.

Analyzing Characteristics of Fractal Yagi Antenna on MOM

Yagi antenna is one kind of traditional antenna. This paper presents the application of Minkowski fractal loop in the design of Yagi antenna arrays. The miniaturization of loop Yagi antenna is realized by utilizing the space filling ability of the fractal. A six-element Minkowski fractal loop Yagi antenna is designed which works at 880 - 960MHz band. Its characteristics are analyzed by using the MoM. The wire antenna is modeled as a thin strip. Planar triangular patches are chosen to discretizated the strip. RWG basis functions are used to model the surface current. The designed fractal Yagi antenna is compared with the square loop Yagi antenna. These two antennas have the similar characteristics in VSWR and radiation, but the size of the fractal Yagi antenna is reduced 29.8%.