TEM喇叭馈源与共面馈源脉冲辐射天线性能比较

Performance comparison between TEM horn and coplanar-feed IRA

在反射面尺寸一定的情况下,优化设计了TEM喇叭馈源与共面馈源脉冲辐射天线,并对比了两种天线的辐射性能。分析了反射面型脉冲辐射天线的工作机理,通过准静态近似,分别得到了两种天线的远区辐射场解析解。通过理论求解,得到了两种馈源在反射面口径造成的场分布,为天线结构设计提供参考。通过分析不同脉冲宽度时两种天线的辐射情况,比较了这两种馈源性能的优劣。完成了上述两种GW级高功率高效率馈源的研制,并开展了对比实验,实验结果与理论分析相吻合。

Based on 2.1mdiameter parabolic reflector,the parameters of TEM horn-feed and coplanar-feed IRA were optimized,and the characteristics of these two antennas were compared in this paper.A physical model of IRA was built and the radiation center movement principle of＂V＂-shaped dipole was investigated.The analytic radiating solution of these two antennas was got by different approximation measurement.From theoretic calculation and numerical simulation,the field distribution of the reflector aperture was obtained.And with different width of excitation impulse,the radiation waveform of these two antennas exhibited regular transformation.With GW peak power capacity,the TEM horn and coplanar-feed IRA were fabricated.The experiment results agree well with the conclusion achieved above.