利用多扇区介质透镜得到TM01模激励的圆锥喇叭笔形波束辐射

 给出了一种改善TM₀₁模辐射特性的方法，由不同厚度的扇区组成的介质透镜放置于圆锥喇叭口径处，适当地选择各个扇区的厚度，从而产生圆极化的轴向为极大值的远场方向图。推导出了该天线辐射场的解析公式，解析结果与数值模拟有较好的吻合。当工作频率为5 GHz时，天线的增益达19.6 dB，口径效率31.3%，具有15.8%的带宽(反射系数S11<0.2), 且适合于高功率辐射。

Achievement of pencil-beam radiation from a TM01 mode circular waveguide source using multi-sector dielectric lens

A method of improving radiation from TM_(01) model conical horn is presented.Drielectric lens consisted of a number of sectors locates on aperture plane of conical horn, and thickness of each sector is choosed appropriately,then the conical horn can radiate circular polarization pattern with a boresight peak. Radiation fields of the horn are given by analytic formulae and the analytic results agree well with that of numerical simulations,the peak pattern gain of the horn with multi-sector dielectric lens is about 19.6 dB,bandwidth is approximately 15.8%(reflect coefficient S_(11)<0.2),and aperture efficiency is 31.8% at 5 GHz.