This switched parasitic yagi - uda antenna uses a yagi - uda antenna as its prototype , and can change radiation pattern by the control of rf switch which is placed at the center of its reflector 该开关八木天线以八木天线为原型,通过八木天线反射器中部的微波开关控制反射器的通断来改变开关八木天线的方向图。
2.
In this dissertation , switched parasitic pattern diversity yagi - uda antenna array used for the base station has been illustrated after the introduction of mimo technologies and the analysis of the base station antenna design for next generation of wireless communication 本文在介绍mimo技术和分析新一代移动通信中基站天线的设计思路的基础上,给出了一种适用于mimo系统基站、具有角度分集功能的开关八木天线阵列。
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The characters of this antenna lie in three points : using yagi - uda antenna to obtain antenna gain through the radial direction ; making full use of the space of the base station along the z - axis direction to get array gain ; arranging the antenna array properly to achieve pattern diversity in azimuth plane 其特点集中体现在三个方面:在天线径向通过八木天线的形式获得增益;充分利用基站空间在z向组成阵列获取阵列增益;利用开关八木天线方向图可重构的特性,通过合理的布局,在方位面内实现角度分集。
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The simulation results are compared to the normal dipole antenna in order to observe the influence of fractal and investigate the effect of antenna miniaturization . the relationship between miniaturization and fractal dimension is researched . the koch and 3 / 2curve fractal unit are applied to yagi - uda antenna , the performance like impedance characteristic and radiation pattern is simulated by cst microwave studio ? 对其阻抗特性及辐射方向图进行了仿真计算,并分别与未应用分形的普通半波振子天线相比较,观察分形对天线性能的影响,以检验分形天线小型化的效果,研究了尺寸缩减性与其分形结构的分形维数之间的关系。
