基于IRA天线的辐射波模拟器天线辐射性能研究

将通常用于超宽带领域的IRA天线应用到辐射波电磁脉冲模拟器中,提出一种基于反射器脉冲辐射天线的核电磁脉冲辐射波模拟器,分析其天线结构,给出四种馈臂形式,通过仿真比较了四种馈臂形式天线的辐射效率、远场和近场波形以及频率增益特性。结果表明:该天线的低频辐射效率有待进一步提高;具有锥形渐缩形式馈臂的天线能产生较好的远场和近场波形。IRA天线相较笼形天线具有体积小、方向性好等优点,如果能进一步提高其低频辐射性能,IRA天线将成为理想的辐射波模拟器天线。

Research on Antenna Radiation Performance of Radiating-Wave Simulator Antenna Based on IRA

This paper presents a new kind of NEMP(nuclear electromagnetic pulse) radiating-wave simulator based on impulse radiating antennas(IRA),which are usally used for ultra-wide band communication.Structure of this antenna is analyzed and four types of feed-arm are designed.Simulations are implemented to have a comparison with the radiant efficiencies,field waveforms and frequency-gain characteristic curves among the four types of antenna.Results suggest that: the antennas have lower radiant efficiency in the low-frequency domain and the antenna with tapered feeding arms can generate better far-field and near-field waveforms.IRAs take advantages of small volume and better directivity than cage antennas.If the low-frequency radiation performance can be enhanced,IRAs will make the ideal antenna used for radiating-wave simulator.