一种新型可移动TEM喇叭辐射波模拟器的模拟优化  

Simulation and optimization of novel movable TEM horn radiating-wave simulator

作　　者：朱湘琴[1] 吴伟[1] 蔡利兵[1] Zhu Xiangqin;Wu Wei;Cai Libing(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]强脉冲辐射环境模拟与效应全国重点实验室(西北核技术研究所),西安710024

出　　处：《强激光与粒子束》2024年第7期21-28,共8页High Power Laser and Particle Beams

基　　金：脉冲辐射环境模拟与效应国家重点实验室专项项目(SKLIPR1601Z)。

摘　　要：为改善基于TEM喇叭的辐射波模拟器的低频辐射特性从而展宽其辐射近场半高宽,首次提出了在指数型TEM喇叭上/下两个极板的端口加上2个金属直板、并通过倾斜金属板和并联电阻相连的新型可移动模拟器的设计方案。基于FDTD方法模拟分析了该新型模拟器的特性参数对其近场辐射性能的影响,并给出了优化后的模拟器及其阵列的辐射特性。计算结果表明:尺寸为6 m×6 m×6.24 m的优化后的新型模拟器在距离口面3 m的中心位置的辐射近场脉宽能达到18.95 ns,而达到相同低频辐射性能的常规模拟器尺寸为9 m×12 m×6.8 m。且与常规模拟器相比,优化后的模拟器的场峰值更大。与前人的研究相比,优化后的模拟器场在保持高峰值的同时,时域波形后延震荡的幅度与主峰的比值明显减小。优化后的模拟器2×2阵列模型的测试平面中心点场峰值最大,且在测试平面上满足6 dB均匀性要求的有效测试区最大;有效测试区在横向上范围最大的是2×2阵列模型,其次是2×1阵列模型;在纵向上范围最大的是2×2阵列模型及1×2阵列模型。To improve the low frequency radiation characteristics of the radiating-wave simulator based on transverse electromagnetic(TEM)horn,a novel movable simulator made up of exponential-type TEM horn,two vertical perfect electric conductor(PEC)plates at its aperture,two sloping PEC plates and parallel resistance is designed firstly.The effect of different exponential tapered rates,the height of the two vertical PEC plates,the width of the source port and the parallel resistance at the end of the two sloping PEC plates to the near-field radiation performance of the novel simulator is simulated and optimized by finite-difference time-domain(FDTD)method.The radiation characteristics of the optimized novel simulator and its arrays is also given.The calculation results show that,the full width at half maximum(FWHM)of the electric field at the testing point which is 3 m away from the optimized novel simulator’s aperture center reaches 18.95 ns,and the optimized novel simulator’s sizes are 6 m×6 m×6.24 m while those of the normal simulator must be 9 m×12 m×6.8 m to get the same low-frequency radiation performance as that of the optimized novel simulator.And higher peak-value of the electric field at the testing point of the optimized novel simulator can be got compared with the normal simulator.In addition,the ratio of the delayed oscillation’s amplitude of the electric field in time-domain at the testing point of the optimized novel simulator to its peak-value is significantly reduced compared with that of the previous studies,while the peak-value of the testing point of the optimized novel simulator keeps high.The electric field’s peak value at the center point in the testing plane of the optimized novel simulator’s 2×2 array model is the largest,and the effective region meeting the requirement of field 6dB uniformity on the testing plane of 2×2 array model has the largest domain;The effective region on the 2×2 array model’s testing plane has the largest horizontal range,followed by 2×1 array model;The

关 键 词：优化 TEM喇叭 电磁脉冲 电阻 辐射波模拟器 FDTD 

分 类 号：TN011[电子电信—物理电子学]