Strict proof and applicable range of the quarter-wavelength model for microwave absorbers
Strict proof and applicable range of the quarter-wavelength model for microwave absorbers
复制标题
微波吸收体四分之一波长模型的严格证明及适用范围
DOI：
10.1088/1361-6463/ab79da
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发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
Fashen Li
中科院分区：
文献类型：
--
作者：
Sha Zhang;Tao Wang;Meizhen Gao;Peng Wang;Hua Pang;Liang Qiao;Fashen Li
在微波吸收材料和电磁吸收体的研究和应用中，四分之一波长模型广泛用于描述反射损耗（RL）峰值频率对电磁参数和厚度的依赖性，以及微波吸收材料的制备和设计。然而，这种基于传输线理论的模型缺乏严格的证明。此外，在某些材料中，RL结果获得的吸收峰与四分之一波长模型的吸收峰之间存在偏差，对此也缺乏普遍合理的理论解释。因此，在这项工作中，我们基于传输线理论推导了四分之一波长模型的严格证明，并为该模型开发了一个修正方程来解释上述偏差。修正后的方程可以很好地拟合我们实验结果中观察到的偏差。结合实验结果，我们还讨论了四分之一波长模型和修正方程的适用范围。此外，这项工作的结果表明，适当的相位角值对于减少吸收体厚度是有效的。
In the research and applications on microwave absorption materials and electromagnetic absorbers, the quarter-wavelength model is widely used in describing the dependence of the reflection loss (RL) peak frequency on electromagnetic parameters and thickness, and in the preparation and design of microwave absorption materials. However, strict proof regarding this model based on transmission line theory is lacking. Moreover, a deviation between the absorption peaks obtained from the RL results and those from the quarter-wavelength model is observed in some materials, for which a universal and reasonable theoretical explanation is also lacking. Hence, in this work, we derive strict proof of the quarter-wavelength model based on transmission line theory, and develop a revised equation for this model to explain the above-mentioned deviation. The revised equation could well fit the deviations observed in our experimental results. Combined with the experimental results, we also discuss the applicable ranges for the quarter-wavelength model and the revised equation. Moreover, the results of this work show that the appropriate value of the phase angle is effective in reducing the absorber thickness.
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