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介绍一种宽频带振子天线,它由旋转对称的导体组成,表面形状沿天线轴线方向是按锥面、球台面、圆筒振子顺序光滑连接而成,在中心用50 Ω同轴电缆馈电. 假定天线表面上等效电流的变化仅沿着导体轴向的表面切线方向,用矩量法计算电流分布,选取三角函数为展开函数和权函数. 用一个例子,给出计算的天线输入阻抗、辐射方向图、方向性系数以及输入驻波比随频率的变化,发现所研究的天线具有满意的宽频带特性
A broadband oscillator antenna is introduced. It consists of a rotationally symmetric conductor. The shape of the antenna surface is along the axis of the antenna. The conical surface, the spherical surface and the cylindrical oscillator are connected smoothly in the order of 50 Ω coaxial cable in the center. Assuming that the change of the equivalent current on the surface of the antenna is only along the tangential direction of the surface of the conductor in the axial direction, the current distribution is calculated by the moment method, and the trigonometric functions are taken as the expansion function and the weighting function. Radiation pattern, directivity coefficient and input standing-wave ratio with the frequency changes, found that the antenna under study with satisfactory broadband characteristics