Miniaturized Anechoic Chamber Constructed Based on an Inhomogeneous PML Model
Miniaturized Anechoic Chamber Constructed Based on an Inhomogeneous PML Model
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基于非均匀PML模型构建的小型化电波暗室
DOI：
10.1109/tmtt.2019.2924924
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发表时间：
2019
影响因子：
4.3
通讯作者：
Ran Lixin
中科院分区：
文献类型：
--
作者：
Peng Tian;Shen Fazhong;Dexin Ye;Wang Chun;Zhou Tianyi;Ma Chao;Zhang Bin;Cui Wangzhao;Li Changzhi;Ran Lixin
在电磁学中，消声室用于获得自由空间的人工模拟。由于吸收材料固有的角度依赖性，这种腔室是电学上大的。现有的完全匹配层（PML）模型意味着，角度无关的无反射光脉冲很难在不涉及增益介质的情况下实现。在本文中，我们从数学上推导了一个非传统的PML模型，在此基础上，吸收材料的角度依赖性可以被操纵来构建电小暗室。作为一个例子，半封闭的圆柱形腔室的实验实现了一个非均匀的人工表面薄至0.012波长。这个腔室的内径是六个波长。实验测量的空间电压驻波比（VSWR）与理论分析和全波模拟一致。借助介质3D打印技术，可以为未来的科学研究和技术开发构建高性能的微型消声室。
In electromagnetics, anechoic chambers are used to obtain artificial analogs of free space. Such chambers are electrically large due to the inherent angle-dependent nature of absorbing materials. Existing models of perfectly matched layer (PML) imply that angle-independent reflectionless absorptions can hardly be achieved without involving gain media. In this paper, we mathematically derived an unconventional PML model, based on which the angle-dependent nature of absorbing materials can be manipulated to construct electrically small anechoic chambers. As an example, a semiclosed cylindrical chamber was experimentally implemented with an inhomogeneous artificial surface as thin as 0.012 wavelength. The inner diameter of this chamber is six wavelengths. The spatial voltage standing wave ratio (VSWR) experimentally measured inside this chamber complies with the theoretical analysis and full-wave simulation. With the aid of the dielectric 3-D printing technology, high-performance, microsized anechoic chambers can be constructed for scientific research and technology development in the future.