对数周期偶极子天线全空间可变相位中心  

Variable phase center of log-periodic dipole antenna in full space

作　　者：金元松[1] 任晓飞[1] 冀海鸣[1] 何绍林[1] 

机构地区：[1]中国电波传播研究所,山东青岛266071

出　　处：《电波科学学报》2007年第2期229-233,共5页Chinese Journal of Radio Science

摘　　要：导出了直线阵列在全空间中存在可变相位中心的条件,得出了由非相似单元组成的直线阵列(如对数周期偶极子天线)不存在全空间可变相位中心,但在E面和H面独立存在各自的可变相位中心的结论。证明了对数周期偶极子天线(LP-DA)在E面和H面有不同的可变相位中心。采用矩量法(MoM)分析了LPDA的E面和H面可变相位中心,计算结果表明:虽然在LPDA的主波束范围内其相位中心变化很小,可以作为“视在相位中心”,但是这种“视在相位中心”仍然在E面和H面是不重合的。此外,“视在相位中心”随着频率沿着集合线移动。In this paper, the condition under which a linear array has a variable phase center in the full space is derived. It is concluded that the non-similar array （such as log-periodic dipole antenna） has not variable phase center in ful space, however, it has variable phase center in the E-plane and H-plane independently. It has been proved that log-periodic dipole antenna （LPDA） has different variable phase center in E-plane and H-plane. The variable phase center of LPDA in E-plane and H-plane had been calculated by Method of Moment（MoM）, the result demonstrates that the variable phase center varies gently in the main beam of LPDA, then the variable phase center is called the ＂approximate phase center＂, however, the ＂approximate phase center＂ in E-plane and H-plane are also not superposition. Moreover, the ＂approximate phase center＂ tracks with frequency in the line.

关 键 词：相位中心 全空间 对数周期天线 

分 类 号：TN821[电子电信—信息与通信工程]