The Countermeasures and Analyses of Highspeed USB 3.1(Gen1) Connector Impact on 2.4 GHz Wireless Network of Notebook.

• Main Authors: Chen, Chien-Ju, 陳建儒
• Other Authors: Tiong, Kwong-Kau
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/8epfyb

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 107 === In the modern competitive consumer electronic market, a viable feature for Notebook is compactness in term of ultra-lightness and thinness. Therefore, the available space inside a Notebook is extremely limited. The spacing between the antenna and USB 3.1(Gen1) needs to be reduced to accommodate housing of other peripherals, rendering the antenna susceptible to electromagnetic interference (EMI). The generated EMI will have adverse impact on 2.4 GHz Wireless Network and wireless devices such as wireless keyboards, mice, 802.11b/g/n and Bluetooth manifested as time-lagged in response and intermittent or complete disconnection in data transmission. Therefore, the suppression technology of EMI played an ever increasing role in the wellbeing of the Notebook industry. This thesis focuses on the EMI issue between the USB 3.1(Gen1) device and Wireless Local Area Network of a Convertible Notebook. The electromagnetic field is measured to identify the interference source and the interference path. The electromagnetic noise suppression measures adopted in this study including making changes in circuit board layout, the using of different electronic filters to filter out the spurious signals, implementing common mode chokes, and the use of electromagnetic shielding materials and absorber materials. The effectiveness of the countermeasures in alleviating the EMI with the Notebook in different operating modes were studied by using the hard disk speed test software (CrystalDiskMark) to analyze the signal quality (Eye Diagram) and data throughput to ascertain the satisfaction of consumer specifications on good data transmission quality of the USB3.1 device.