太赫兹科学与电子信息学报  2020, Vol. 18 Issue (6): 1045-1050     DOI: 10.11805/TKYDA2019266

1. 中国商用飞机有限责任公司 上海飞机设计研究院，上海 201210;
2. 湖南交通工程学院 高科技研究院，湖南 衡阳 421009;
3. 中南大学 数学与统计学院，湖南 长沙 410083

Simulation of electromagnetic coupling effect of high frequency and strong field source on antenna feed system
JI Tao1, LUO Jianshu2, HOU Muzhou3
1. Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China Ltd, Shanghai 201210, China;
2. High Technology Research Institute, Hunan Traffic Engineering College, Hengyang Hunan 421009, China;
3. School of Mathematics and Statistics, Central South University, Changsha Hunan 410083, China
Abstract: The purpose of this study is to obtain the estimation of the electromagnetic interference caused by the antenna feed system to the given equipment nearby, so as to optimize the design parameters of the antenna feed system. In this study, the magnetic field module in COMSOL is utilized to simulate the electric field intensity and current density excited by the whole antenna feed system under the external electromagnetic field. The model space is truncated by infinite element domain. The induced current is mainly distributed on the inner and outer surface of the solid of the antenna feed subsystem, and its value is generally about 650 A/mm2, while the induced current in the solid of the antenna feed subsystem is less than 6 A/mm2. For the region with thin wall, the induced current in the solid is also large. For a given excitation, the wave reaches two line probes at the same time and produces induction current. The simulation results show that the coupling electromagnetic effect of the antenna feed subsystem on the external radiation electromagnetic source is mainly concentrated on the surface of the solid part, which causes the signal to change and has a great effect on the bit error rate.
Keywords: electromagnetic coupling    grid division    simulations    antenna feed system

1 几何模型

 Fig.1 Model of antenna feed system 图 1 天馈系统模型

2 各部分材料

 Fig.2 Material of antenna feed system 图 2 天馈系统所用材料

3 参数、边界条件与控制方程

 $\left\{ \begin{array}{l} \boldsymbol{\nabla} \times \mathit{\boldsymbol{H}} = \mathit{\boldsymbol{J}}\\ \mathit{\boldsymbol{B}} = \boldsymbol{\nabla} \times \left( {{\mathit{\boldsymbol{A}}_{\rm{b}}} + {\mathit{\boldsymbol{A}}_{\rm{r}}}} \right)\\ \mathit{\boldsymbol{J}} = \sigma \mathit{\boldsymbol{E}} + {\rm{j}}\omega D + {\mathit{\boldsymbol{J}}_{\rm{e}}}\\ \mathit{\boldsymbol{E}} = - {\rm{j}}\omega \left( {{\mathit{\boldsymbol{A}}_{\rm{b}}} + {\mathit{\boldsymbol{A}}_{\rm{r}}}} \right) \end{array} \right.$ (1)

 $\sqrt{\frac{{{\mu }_{0}}{{\mu }_{\text{r}}}}{{{\epsilon }_{0}}{{\epsilon }_{\text{r}}}-\text{j}\frac{\sigma }{\omega }}}\mathit{\boldsymbol{n}} \times \mathit{\boldsymbol{H}} + \mathit{\boldsymbol{E}} - \left({\mathit{\boldsymbol{n}} \cdot \mathit{\boldsymbol{E}}} \right)\mathit{\boldsymbol{n}} = \left({\mathit{\boldsymbol{n}} \cdot {\mathit{\boldsymbol{E}}_{\rm{s}}}} \right)\mathit{\boldsymbol{n}} - {\mathit{\boldsymbol{E}}_{\rm{s}}}$ (2)

4 网格剖分

 Fig.3 Grid model 图 3 网格模型

5 仿真结果及其分析

 Fig.4 Comparison of different relative accuracies 图 4 不同相对精确度对比
5.1 电场强度

 Fig.5 Distribution of electric field intensity in antenna feed system 图 5 天馈系统电场强度分布

 Fig.6 Electric field intensity distribution of each part of antenna feed subsystem 图 6 天馈子系统各部分场强分布
5.2 电流密度

 Fig.7 Current density distribution of antenna feed subsystem 图 7 天馈子系统感应电流密度分布
6 结论

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