为实现非接触检测一定范围内电气设备局部放电(PD)，研究并设计了宽频带、高增益和水平面(H面)全向性的超高频(UHF)天线作为PD信号检测传感器。通过分析盘锥天线的辐射特性和特性阻抗，确定其设计为UHF信号接收天线具有优势，再通过仿真计算，对天线结构进行了优化，据此制作出离散化加工的盘锥天线，该天线频带为200 MHz~2 GHz以上，平均增益4 dB以上，达到设计要求，在对较远距离外模拟放电信号和变电站实际放电信号的接收试验中表现出良好的UHF信号接收能力。基于该天线可以开发出固定式或车载式PD监测系统，该系统可以监测整个变电站设备PD情况并且其工作不同设备发生接触。

To realize the noncontact detection of partial discharge of electrical equipment within some range，a wideband，good gain and horizontal plane omnidirectional ultra-high frequency antenna is researched，and it is used as detecting sensor of partial discharge(PD) signals. Characteristic radiation and characteristic impedance of discone antenna are analyzed，and it is found that it is dominant to design the dicone antenna as UHF signal detecting antenna. Then the structure of the antenna is optimized via calculate simulation. The band of the discone antenna is from 200 MHz to above 2 GHz and its average gain is above 4 dB. It is made via discrete method according to the analysis and simulation result，satisfying the design demand. The discone antenna shows good performance to detect analog discharge signals and PD signals in substation from far away. Fixed and mounted PD monitoring system can be developed based on this antenna，and the system can monitor PD of electrical equipment within substation without contacting equipment.

重庆市科技攻关计划（院士专项）（CSCT2010BC3003）；国家重点实验室自主研究课题（2007DA10512709104）；重庆市电力公司科学技术项目（2011渝电科技18