感性耦合夹层等离子体隐身天线罩电磁散射分析

doi:10.7527/S1000-6893.2017.21472

电子电气工程与控制

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感性耦合夹层等离子体隐身天线罩电磁散射分析

陈俊霖, 徐浩军, 魏小龙, 陈增辉, 吕晗阳

空军工程大学航空航天工程学院, 西安 710038

收稿日期:2017-06-01 修回日期:2017-12-20 出版日期:2018-03-15 发布日期:2017-12-20
通讯作者: 徐浩军,E-mail:xuhaojun1965@163.com E-mail:xuhaojun1965@163.com
基金资助:
国家自然科学基金（11402301）

Electromagnetic scattering analysis of stealth radome with inductively coupled plasma in interlayer chamber

CHEN Junlin, XU Haojun, WEI Xiaolong, CHEN Zenghui, LYU Hanyang

School of Aeronautics and Astronautics, Air Force Engineering University, Xi'an 710038, China

Received:2017-06-01 Revised:2017-12-20 Online:2018-03-15 Published:2017-12-20
Supported by:
National Natural Science Foundation of China (11402301)

摘要/Abstract

摘要： 设计了一种石英夹层感性耦合等离子体（ICP）隐身天线罩模型，采用有限元与Z变换时域有限差分（ZT-FDTD）联合仿真的方法，建立了ICP放电的流体模型，得到不同气压及功率下与电磁散射相关的电子密度空间分布，在此基础上建立Z变换时域有限差分法模型，对石英夹层等离子体隐身天线罩的宽频段后向散射进行计算，同时利用微波干涉法及XFDTD软件对算法及程序进行验证。结果表明：感性耦合等离子体可产生较高密度等离子体，能有效实现雷达散射截面（RCS）的减缩，在气压为2 Pa时，碰撞衰减较弱，等离子体密度分布较均匀，衰减带宽集中在等离子体振荡频率附近，功率增加会使衰减峰值向高频方向移动，气压为20 Pa时，碰撞衰减增强，且等离子体密度分布有较大梯度，衰减带宽有效增加，同时RCS曲线的波动特性加强。

关键词: 感性耦合等离子体, 隐身天线罩, 流体模型, 时域有限差分法, 雷达散射截面

Abstract: A stealth radome model with Inductively Coupled Plasma (ICP) in the interlayer chamber is designed. A two-dimensional fluid model of ICP discharge is built by integrating the finite element method and the ZT-FDTD method. The electron density distribution related to the electromagnetic scattering with different power and pressure is obtained. The FDTD method for Z transformation is established to calculate the backscatter of the plasma radome on the broadband. Microwave interference diagnosis and XFDTD software are used to validate the calculation. The results show that the ICP can produce high density plasma, and can effectively achieve the reduction of the Radar Cross Section (RCS). At 2 Pa air pressure, the electron density distribution is uniform, the collisional absorption of plasma is relatively weak, the bandwidth of the attenuation of RCS is concentrated near the plasma frequency, and the attenuation peak will move to high frequency zone with the increase of the power. At 20 Pa air pressure, the collisional absorption of the plasma is obviously improved to have larger gradient in density distribution of electrons, the bandwidth of the attenuation of RCS increases effectively, and the wave characteristics of the RCS profile is strengthened at the same time.

Key words: inductively coupled plasma, stealth radome, fluid model, FDTD method, radar cross section

中图分类号:

V218
TN95

陈俊霖, 徐浩军, 魏小龙, 陈增辉, 吕晗阳. 感性耦合夹层等离子体隐身天线罩电磁散射分析[J]. 航空学报, 2018, 39(3): 321472-321472.

CHEN Junlin, XU Haojun, WEI Xiaolong, CHEN Zenghui, LYU Hanyang. Electromagnetic scattering analysis of stealth radome with inductively coupled plasma in interlayer chamber[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(3): 321472-321472.

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E-mail：hkxb@buaa.edu.cn

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感性耦合夹层等离子体隐身天线罩电磁散射分析

Electromagnetic scattering analysis of stealth radome with inductively coupled plasma in interlayer chamber

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