影音系統常用之HDMI線材之金屬編織網結合方式對EMI之效果與影響

The effects and the influences of the metal braid binding modes of HDMI cables commonly used in audio and video systems

李泉杰(Chuna-Chieh Lee)

指導教授 ： 籃山明

中原大學/工學院/電子工程研究所/碩士(2013年)

https://doi.org/10.6840/cycu201300239

摘要

摘要

本文研究目的，主要探討現今使用在影音通訊上的HDMI (High Definition Multimedia，高解析多媒體介面，HDMI)線材，HDMI線材內的金屬編織網在末端收尾方式與接地面積；對於在EMI電磁波輻射干擾(Electromagnetic Interference，EMI)抑制之最佳成效。
之所以以此為題目做為研究之方向與論文，主要是因為現今電磁波干擾的形成問題與對人體上的危害及影響，在生活中有逐漸被發現重視之趨勢。而在目前HDMI產品生產中，對此方面較多於使用線材材質的研究，如此的正式測試並不多見。所以；在此研究當中，會使用標準的EMI實驗室與量測設備，將較常用之HDMI的線材依不同的接地面積及大小不同，透過實際量測與分析，進而了解HDMI線材在30MHZ ~ 1GHZ的標準量測下，因線材的金屬編織網不同呈獻出電磁波輻射干擾屏蔽效果為何。
經由實驗之後，我們可以了解到，HDMI線材內部之金屬編織網的接地面積大的會較接地面積小的電磁波輻射干擾屏蔽效果優秀。冀望此研究中的個項探討與研究結果，能夠對於有志研究與了解的業界的先進們，提供一些個人之卓見。

關鍵字

電磁波干擾

並列摘要

Abstract

The purpose of this study focuses mainly on the investigation of HDMI cables that are presently used in the audio and video communications, the ways of metal braid closeout patterns at the ends and the ground areas of HDMI cables; as well as the best results for the suppression of interfering electromagnetic radiation of EMI.
The reason why we choose this subject as the interests and the thesis for our study is mainly because of the increasing emphasis trend on the problems of electromagnetic interferences and the hazards as well as the impacts caused for human bodies of the modern life. As far as the current HDMI product manufacturing, most of the studies focus on the applications of cable materials and it is rare for such formal tests. Therefore, in this study we used the standard EMI laboratory and measuring devices to measure and to analyze the commonly used HDMI cables of different ground areas and sizes. With the actual measurements and analyses, we tried to find out the shielding effects of electromagnetic radiation interference that are presented by different cable metal braids under the standard 30MHz ~ 1GHz measuring conditions of the HDMI cables.
With the experiments, we found that the metal braids inside the HDMI cables with larger ground areas showed better shielding effects of electromagnetic radiation interference than those with smaller ground areas. We hope that, with the investigations and the results of this study, we might provide some personal opinions for those experts of the industries who are interested in the research and the understanding of this field.

並列關鍵字

EMC ； EMI

參考文獻

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