指向性控制和恒指向性号筒综述

介绍了指向性因数和指向性指数的定义、计算式。按历史次序讨论了多格号筒、径向号筒、CE号筒、曼塔莱号筒的指向性特性。还简要讨论了号筒内的失真，以及一个恒指向性号筒的实例，给出了实测的水平和垂直的极坐标响应、波束宽度，及指向性因数和指向性指数与频率的关系。最后，简单介绍了磁液在压缩驱动器中的应用。

Summarize of Directive Property Control and Constant Directivity Horn

The definition of directivity factor,directivity index & equation are introduced firstly.Then the directivity index of multicellular horns,radial horns,and CE horns & manta-ray horns based on the history consequences are discussed.The distortion in a horn simply,and an example of a constant directivity horn are discussed,which gives an actual measured polar response,beam width at horizontal & vertical axis,the relation among directivity factor,and directivity index & frequency.The application of ferrofluid ...