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

• Main Authors: Chuna-Chieh Lee, 李泉杰
• Other Authors: Shan-Ming Lan
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/08784510947828979886

碩士 === 中原大學 === 電子工程研究所 === 101 === 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.