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首页> 外文期刊>Electronics and Communications in Japan / 電子情報通信. Part 1, Communications >Investigation on Suppression Effect of Radiated Electromagnetic Field from Printed Circuit Board with Differential Transmission Mode Using Method of Moments
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Investigation on Suppression Effect of Radiated Electromagnetic Field from Printed Circuit Board with Differential Transmission Mode Using Method of Moments

机译：矩量法研究差分传输模式下印刷电路板辐射电磁场的抑制作用

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摘要

As the frequency used in electronic devices increases, limitations on the lumped element type components for prevention of radiated emission appear. Methods for suppression of radiated emission from printed circuit boards by means of differential mode transmission have been studied. However, most of these studies are centered on theoretical analysis. There has been no investigation from both the experimental and theoretical points of view in the high-frequency regions. In this paper, with a view to easily deriving the suppression effect of radiated emission, the electromagnetic fields radiated from differential mode transmission and common mode transmission are derived by the method of moments from a model of parallel micro-strip lines with the effective relative permittivity and the equivalent wires. The suppression of radiation from the differential mode transmission is studied in comparison with the measured data. It is found that the difference between the measured and calculated values of the maximum radiated electric field is less than about 3 dB in the range of 100 MHz to 3 GHz, except near 2 GHz in the case of the common mode transmission. With regard to the suppression effect, the difference between the measured and calculated values is less than 5 dB at 1 to 3 GHz. An investigation with this analytical model found that the radiation suppression effect can be improved by 5 to 10 dB at 1 to 3 GHz by changing the spacing between parallel microstrip lines to 1 mm from 5 mm, that the suppression effect is degraded by about 5 dB due to curvature, and that the radiation suppression effect is decreased by 5 to 20 dB at 1 to 3 GHz if the deviation of the transmission line lengths of a pair of parallel microstrip lines measured from one end reaches 10%.
机译：随着电子设备中使用的频率增加，用于防止辐射发射的集总元件型组件的限制出现。研究了通过差模传输抑制印刷电路板辐射的方法。但是，这些研究大多集中在理论分析上。从实验和理论的角度都没有对高频区域进行研究。为了容易推导辐射发射的抑制效果，利用矩量法，从具有有效相对介电常数的平行微带线模型中，利用矩量法，导出了差模传输和共模传输辐射的电磁场。和等效的电线。与实测数据比较，研究了差模传输对辐射的抑制作用。已经发现，在100MHz至3GHz的范围内，最大辐射电场的测量值与计算值之间的差小于约3dB，除了在共模传输的情况下接近2GHz。关于抑制效果，在1至3 GHz时，测量值与计算值之差小于5 dB。使用此分析模型进行的研究发现，通过将平行微带线之间的间距从5 mm更改为1 mm，在1至3 GHz时可以将辐射抑制效果提高5至10 dB，抑制效果降低了约5 dB。由于曲率，并且如果从一端测量的一对平行微带线的传输线长度的偏差达到10％，则辐射抑制效果在1至3 GHz时会降低5至20 dB。

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