月球射电探测仪天线特性分析  

Characteristics analysis for the antenna of lunar low-frequency radio telescope

作　　者：龚莉媛[1] 陈志雨[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《地球物理学进展》2006年第1期309-313,共5页Progress in Geophysics

基　　金：中国科学院电子所知识创新工程项目(1020-07)资助

摘　　要：介绍了月球射电探测仪的基本原理,讨论了所使用的电偶极天线的优点及阻抗特性,用平面波展开结合几何学法代替传统的索莫菲积分方法,得到了月球地层上方不同频率及不同距地高度的天线方向图,结果表明城1MHzx^30 MHz频率范围内,高离地高度在1.5~2.5 m以上,对空灵敏度最高.本文结果为选择出最佳方案提供了参考.The fundamental principle of the lunar low-frequency radio telescope is introduced in this paper. The advantage and impedance characteristics of the used dipole antenna are discussed. The patterns of antenna at different frequencies and heights from ground are obtained by the planewave expansion with the Geometry optics instead of the traditional Sommerfrld integral method. The results indicate that sensitivity is the best above 1.5 ～ 2.5 meter from ground in the range of 1 MHz～30 MHz. The conclusions can help to choose the optimum design finally.

关 键 词：射电探测仪 电偶极天线 方向图 阻抗 

分 类 号：P368[天文地球—地球物理学] P228