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Statistical Analysis of Fabrication Discrepancy Effects on Periodic Circuit Analog Electromagnetic Absorbers
IEEE Transactions on Electromagnetic Compatibility ( IF 2.1 ) Pub Date : 2020-08-12 , DOI: 10.1109/temc.2020.3012585
Hsi-Tseng Chou , Yi-Sheng Chang

Periodic circuit analog absorbers (PCAAs) are widely used to reduce electromagnetic (EM) scattering fields in various applications. Their performances are sensitive to various geometric parameters. Thus, the stability and sensitivity of the EM absorbing characteristics of PCAAs during a fabrication discrepancy due to the manufacturing uncertainty were investigated. These discrepancies are large in terms of the wavelengths at high frequencies. This article considered randomly produced nonuniform thicknesses of a conductive ink to fabricate the array structure of a PCAA and its two sandwiching dielectric substrate layers on both sides. To examine the discrepancies in fabrication, the thicknesses of the conductive ink were generated from random numbers with a desired mean value and a reasonable standard deviation of the normal distribution. To indicate the EM-field absorbing capability, we studied characteristics, such as S -parameters (reflection and transmission coefficients) and the resulting power efficiency, using numerical high frequency structure simulator (HFSS) full-wave simulations at a frequency band of 10 GHz. They were further validated by conducting experiments on prototype samples. We observed that the resonant frequencies were considerably affected by the thickness of the conductive ink in the PCAA structures. A fabrication accuracy of less than ${10^{ - 4}}\lambda $ was required to attain a stable performance.

中文翻译:

周期误差模拟电磁吸收器制造误差影响的统计分析

周期性电路模拟吸收器(PCAA)被广泛用于减少各种应用中的电磁(EM)散射场。它们的性能对各种几何参数敏感。因此,研究了由于制造不确定性而在制造差异期间PCAA的EM吸收特性的稳定性和敏感性。就高频波长而言,这些差异很大。本文考虑了随机产生的厚度不均匀的导电油墨,以制造PCAA及其两侧的两层电介质基底层的阵列结构。为了检查制造中的差异,从具有期望平均值和正态分布的合理标准偏差的随机数生成导电油墨的厚度。小号 使用数值高频结构仿真器(HFSS)在10 GHz频段进行全波仿真,可以确定参数(反射系数和传输系数)以及由此产生的功率效率。通过对原型样品进行实验进一步验证了它们。我们观察到,共振频率受PCAA结构中导电油墨厚度的影响很大。制造精度小于$ {10 ^ {-4}} \ lambda $ 需要获得稳定的性能。
更新日期:2020-08-12
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