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由一个激励缝隙和两个寄生振子组成的天线——电磁元,能使E和H面方向图波瓣宽度接近相等,提高方向性系数,降低背向辐射,减小单元之间的耦合,有益于阵列设计。本文讨论了这种电磁复合偶极子的辐射,给出了波瓣宽度接近相同的天线结构参数,进行了数值计算和实验研究,结果两者吻合得较好。文中从等效网络的观点出发,分析、计算了耦合系数、激励电流、辐射导钠,绘成了曲线,给出了输入端电压驻波比VSWR随寄生振子长度变化的实验曲线。
An electromagnetic field consisting of an excitation gap and two parasitic elements can approximate the width of the lobe in the E and H planes, increase the directivity coefficient, reduce the backscatter and reduce the coupling between the cells. In the array design. In this paper, the radiation of the electromagnetic dipole is discussed, and the parameters of antenna structure with similar lobe width are given. Numerical calculations and experimental studies are carried out. The results agree well with each other. From the viewpoint of equivalent network, the coupling coefficient, excitation current and sodium in the radiation are analyzed and calculated, and the curves are plotted. The experimental curves of the VSWR of the input voltage varying with the parasitic oscillator length are given.