球形和锥形加载单极子天线的宽带特性研究

Study on the Broadband Characteristics of Sphere and Cone Loaded Single-Pole Antenna

本文设计了两种新颖的旋转对称单极子宽带天线 ,其终端分别采用球形加载和锥形加载技术 ,母线运用圆滑曲线过渡避免天线半径导数的不连续 ,有效地改善了阻抗特性、展宽了频段。文中应用扩展矩量法进行理论分析和实际计算 ,比较了同一高度、相同锥角条件下两种天线和不同高度、相同锥角及同一高度、不同锥角条件下同种天线的驻波比和增益获得了超宽频带的良好特性 ,其理论计算与实验测量结果吻合较好 ,为工程设计提供了理论依据。

In this paper,two kinds of novel rotationally symmetric single-pole antenna are presented. Their terminals use sphere and cone loaded techniques respectively. The smooth gene-ratrix avoids the discontinuity of radius curvature. The impeda nce characteristics are improved effectively. Applying the extended moment metho d to the theoretical analysis and calculation, the characteristics for the two k inds of antennas under identical heights and cone angles, under diffe-rent heig hts and identical cone angles, and also under identical heights and different co ne angles are compared respectively. The research work provides theoretical basi s for practical design, and the experimental results agree well with that of the theoretical calculation.