| 引用本文: | 李承祖,田成林.多层吸波和多层透波材料阻抗匹配问题研究.[J].国防科技大学学报,1991,13(4):66-73.[点击复制] |
| Li Chengzu,Tian Chenglin.A Study on the Impedance Matching of Multi-layer Absorption Materials and Multi-layer Transmission Materials[J].Journal of National University of Defense Technology,1991,13(4):66-73[点击复制] |
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| 多层吸波和多层透波材料阻抗匹配问题研究 |
| 李承祖, 田成林 |
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(应用物理系)
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| 摘要: |
| 本文使用多目标目标函数[1]对一种特殊结构的电磁波吸收材料的电磁参数进行了优化计算，给出了 5～15GHz 频带内的几组吸收率大于20db的设计参数以及这些参数对应的垂直极化波、平行极化波入射角0°、20°、45°、60°情况下的吸收曲线。计算结果表明:只要优选各层参数，即使某些“夹层”不具有吸收性能仍可得到极好的吸波特性；单纯的电吸收或单纯的磁吸收都难以获得高的吸波效能；良好的阻抗匹配并不一定要在阻抗“渐变过程”情况下实现；对于出射波侧是自由空间的透波材料，用不具有吸收性能的材料，良好的匹配只在各层εr≈μr情况下得到。 |
| 关键词: 吸波材料，透波材料，电磁参数，阻抗匹配，优化计算 |
| DOI： |
| 投稿日期：1990-12-12 |
| 基金项目:国家自然科学基金资助项目 |
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| A Study on the Impedance Matching of Multi-layer Absorption Materials and Multi-layer Transmission Materials |
| Li Chengzu, Tian Chenglin |
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(Department of Applied Physics)
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| Abstract: |
| An example，the optimization of electromagnetic parameters for a special-structured electromagnetic wave absorber are computed by using multi-objective functions. Some parameters with absorptivities>20db with in 5～15GHz and the absorption curves of perpendicular and parallel polarization at incident angle 0°,20°, 45°and 60°corresponding to these parameters are given.It is proved that good absorption characteristics can be obtained even if some inserted layers' do not absorb，provided that the parameters for all layers are optimized. It is difficult to obtain high absorptivity by purely using electronic or magnetic absorber. “Gradual impedance transition” is not the only method to get good electronic matching. For a transmission material with emergent side being “free space”，a good impedance matching can be obtained only at εr≈μr when using materials do not possess absorbency. |
| Keywords: impedance matching,aborbtion material,transmission material,electrmnagnetic parameters,optimization |
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