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Improved Resonator Method for Microwave Testing of Magnetic Composite Sheets

机译：改进的共振器方法对磁性复合材料板进行微波测试

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摘要

The applications of magnetic composites in electromagnetic shielding, resonance imaging, and biomedical drug research are growing rapidly. Therefore, there is a huge demand to characterize these materials in order to obtain their dielectric and magnetic properties in the microwave frequency range. In this paper, a novel rectangular cavity method is proposed to obtain the complex permeability and permittivity of the test sample placed in the -plane of the rectangular cavity. The proposed method eliminates the need of physical relocation of a specimen in the -plane, which is usually required in the case of presently available methods to characterize the magnetic samples. The closed-form formula for this unified approach is developed from the first principle, and is later modified to consider some practical consideration. The proposed method is first numerically tested and verified for various standard samples, where the data are taken from the literature. Thereafter, the -band rectangular cavity is designed and fabricated to measure a number of available samples. The significance of the proposed approach can be appreciated from the fact that even for finite-size samples, the permeability and permittivity can be extracted with the typical errors of 5% and 2%, respectively.
机译：磁性复合材料在电磁屏蔽，共振成像和生物医学药物研究中的应用正在迅速增长。因此，迫切需要表征这些材料，以便在微波频率范围内获得其介电和磁性能。在本文中，提出了一种新颖的矩形腔方法，以获取放置在矩形腔的-平面中的测试样品的复磁导率和介电常数。所提出的方法消除了在平面内对样品进行物理重定位的需要，这在当前可用的表征磁性样品的方法的情况下通常是必需的。此统一方法的闭式公式是从第一个原理发展而来的，后来对其进行了修改以考虑一些实际考虑。首先对各种标准样品进行了数值测试和验证，方法是从文献中获取的。此后，设计和制造带状矩形腔以测量许多可用样本。从以下事实可以认识到所提出方法的重要性，即使对于有限大小的样本，也可以提取出渗透率和介电常数，其典型误差分别为5％和2％。

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