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。
On the base of above it , this paper discuss the synthesis of optimum distributed arrays by nonuniform spacing in the sense of dolph - chebyshev . having derived the equations of optimum element distribution , we analyze the exponentially spaced array , which are optimum when the elements are isotropic and equally weighted , and the array by general raised cosine function . the formulate for estimating the sidelobe envelope , beamwidth of the array pattern and clean region width are obtained 推导了最佳阵元分布方程,分别对阵元无方向性和等加权时的最佳分布式阵列? ?指数间隔阵列和采用广义升余弦加权的最佳分布式阵列进行了分析,推导了天线方向图旁瓣包络、波束宽度,干净扫描区宽度的估计公式,给出了近轴旁瓣电平与阵列参数的关系。
In this dissertation , the performance of linearly tapered fin - fed slot antenna ( lwsa ) is discussed in theory , simulation and experiment . the radiation pattern characteristic influenced by changes of antenna ’ s dielectric material , tapered shape and dimension is studied detailedly . though the tapered slot antenna design is very important , a good waveguide - to - finline taper transitions is also needed because they could not thought over separately 本文主要采用理论分析、数值仿真和实验等手段对线性渐变槽天线的特性进行了研究,分析了介质材料、天线渐变段以及天线尺寸对天线方向图的影响,分别设计了天线罩、线性渐变槽天线以及天线的馈电结构。
