近场测量中零探头研究与设计  

Research and Design of the Null Probe for Near Field Measurement

作　　者：洪家才[1] 

机构地区：[1]装备指挥技术学院测量控制系 北京101416

出　　处：《装备指挥技术学院学报》2004年第3期77-80,共4页Journal of the Academy of Equipment Command & Technology

基　　金：国防科技重点实验室资助项目(99JS07.9.1HK0109)

摘　　要：在近场仿真的基础上,研究和设计了近场测量中天线低副瓣精确测量需要的零探头.零探头是方向图具有空间滤波特性的探头,它对被测天线的主波束进行了抑制,而对副瓣处方向图变化较小,可提高天线测试的动态范围,提高副瓣测试的精度;设计的零探头,采用了圆波导的高次模差方向图特性,既可作为零探头,又可作为普通探头使用;实际测试表明:零探头达到了设计要求.A new type of probe for accurately measuring antenna's low sidelobe in near field measurement system, which is called null probe, is studied and designed. The simulation of the near field measurement by using such probe shows that low sidelobes will be accurately measured. Null probe has the ability of spacial filter for the test antenna's spectrum by reducing sensitivity of the main beam. In this way, the measurement error of the low sidelobes of antenna are minimized. The designed probe, using the property of high-order modes in circular waveguide, can be used as ordinary probe as well as null probe.

关 键 词：近场测量 零探头 圆波导 天线 方向图 

分 类 号：TN82[电子电信—信息与通信工程]