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首页> 外文OA文献 >誘電・磁性損失シートを装着したマイクロストリップ線路の伝送特性のFDTD法による電磁界解析に関する研究
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誘電・磁性損失シートを装着したマイクロストリップ線路の伝送特性のFDTD法による電磁界解析に関する研究

机译：FDTD法研究介质/磁损耗片微带线传输特性的电磁场分析

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摘要

In recent years, as electronic devices are increasingly used in various fields, electromagneticcompatibility (EMC) problems have become more important. One such problem iselectromagnetic disturbance, conducted electromagnetic noise and radiated emission noise, onelectronic circuit boards, and a solution is to attach a dielectric and magnetic loss sheet, such asa noise suppression sheet, to the circuit board.In order to apply this noise suppression sheet technology to noise suppression of microstriplines, it is necessary to consider the material design according to the purpose of usage, for whichcomputational electromagnetic analysis is effective. However, due to the frequency dispersionof noise suppression sheets, we are unable to analyze arbitrary materials using conventionalcomputational electromagnetic methods. Another disadvantage of the conventional methods isthat it takes time to obtain a sufficient number of calculation results.To utilize the creation of guidelines on the material design and usage of noise suppressionsheets, this paper proposes a new computational electromagnetic method that can be applied toany noise suppression sheet materials and that can calculate short frequency intervals within apractical time. The paper also demonstrates that our proposed method can be used to calculatethe transmission characteristics of microstrip lines covered with a noise suppression sheet.In this study, we use the Finite Difference Time Domain Method (FDTD) for computationalelectromagnetic analysis. For calculating frequency dispersion, we incorporate theconvolution integral into this calculation algorithm. Since this calculation requires timedomain data of material constants of noise suppression sheet, we extrapolate the measurementdata of material constants in the frequency domain and thus derive time data using the inversediscrete Fourier transform.Using the proposed method, we calculate the transmission characteristics of microstrip linescovered with a noise suppression sheet. We compare the results with the calculation resultsobtained by sinusoidal excitation in the conventional FDTD calculation method, and the tworesults show good agreement, demonstrating the reliability of the proposed method. Thecomparison also indicates that the proposed method significantly reduces the calculation time, and that even though the calculation results do not match, they present the same tendencies.We suspect that a gap between the board and noise suppression sheet causes the discrepancyof calculation values, so we make calculations with the proposed method using a subcell modelthat simulates the gap. As a result, the calculated results and the measured results matchedwithin 2GHz, clarifying that this gap can be simulated by the subcell model. It also revealsthat, when calculating the transmission characteristics of microstrip lines covered with a noisesuppression sheet using the proposed method, a gap between board and noise suppression sheetis an important factor.The electromagnetic coupling (crosstalk) generated between microstrip lines is one of theimportant transmission characteristics of microstrip lines. With regard to crosstalk betweentwo parallel microstrip lines covered with a noise suppression sheet, we check whether ourproposed method can be applied to such crosstalk and discuss the effect of covering thosemicrostrip lines with a noise suppression sheet. Since it is necessary to use a terminalproducing small reflection for one of the microstrip lines, we propose a terminal that simulatesthe lumped-circuit elements of resistance and inductance.Comparison of the results of measurement and those calculated by the proposed method showgood agreement and thus the proposed method can be applied to the crosstalk. In addition, it isclarified that when microstrip lines have a noise suppression sheet, the crosstalk greatlyincreases.Furthermore, as a method for reducing the crosstalk, we study dividing a noise suppressionsheet between two microstrip lines and find that crosstalk is reduced. The interval for dividingthe noise suppression sheet needs to be studied by focusing on S41.From these findings, we conclude that the proposed calculation method is highly effectiveand can be applied to guidelines, etc. on the material design and usage of noise suppressionsheets.
机译：近年来，随着电子设备在各个领域中的使用越来越多，电磁兼容性（EMC）问题变得越来越重要。这样的问题之一是在电子电路板上的电磁干扰，传导的电磁噪声和辐射的发射噪声，并且解决方案是将介电和磁损耗片（例如噪声抑制片）附着到电路板上。技术对微带线的噪声抑制，有必要根据使用目的考虑材料设计，对于计算电磁分析是有效的。但是，由于噪声抑制片的频散，我们无法使用常规的计算电磁方法来分析任意材料。传统方法的另一个缺点是要花费足够的时间才能获得足够的计算结果。为了利用材料设计指南和噪声抑制片的使用方法，本文提出了一种可以应用于任何噪声抑制的新型计算电磁方法。板材，可以在实际时间内计算出较短的频率间隔。本文还证明了本文提出的方法可用于计算覆盖有噪声抑制片的微带线的传输特性。在本文中，我们使用时域有限差分法（FDTD）进行电磁分析计算。为了计算频散，我们将卷积积分合并到该计算算法中。由于该计算需要噪声抑制片的材料常数的时域数据，因此我们在频域中外推材料常数的测量数据，然后使用离散傅里叶逆变换导出时间数据。使用所提出的方法，我们计算出了覆盖有微带线的传输特性噪音抑制表。我们将结果与常规FDTD计算方法中通过正弦激励获得的计算结果进行了比较，两个结果显示出很好的一致性，证明了该方法的可靠性。比较结果还表明，该方法显着减少了计算时间，即使计算结果不匹配，它们也呈现出相同的趋势。我们怀疑板与噪声抑制片之间的间隙会导致计算值的差异，因此我们使用拟议的方法，使用模拟间隙的子像元模型进行计算。结果，计算结果和测量结果在2GHz内匹配，这说明可以通过子单元模型来模拟此间隙。还表明，在使用所提出的方法计算覆盖有噪声抑制片的微带线的传输特性时，板与噪声抑制片之间的间隙是一个重要因素。微带线之间产生的电磁耦合（串扰）是重要的传输特性之一微带线。关于用噪声抑制片覆盖的两条平行微带线之间的串扰，我们检查了我们提出的方法是否可以应用于这种串扰，并讨论了用噪声抑制片覆盖那些微带线的效果。由于有必要在一条微带线中使用一个产生小反射的端子，因此我们建议一种端子来模拟电阻和电感的集总电路元件。测量结果与通过该方法计算的结果的比较显示出良好的一致性，因此所提出的方法可以应用于串扰。另外，明确了当微带线具有噪声抑制片时，串扰大大增加。此外，作为减少串扰的方法，我们研究了在两个微带线之间划分噪声抑制片，发现串扰被减小。从噪声抑制片的划分间隔出发，需要重点研究S41。从这些发现可以看出，本文提出的计算方法是有效的，可以应用于噪声抑制片的材料设计和使用等方面的指导原则。

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