Using FDTD Method To Discuss The Influence Of Humidity In Long Distance RF Transmission

• Main Authors: Wen-Juin Wu, 吳文鈞
• Other Authors: 李宗翰
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/56693862989242050375

碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 99 === The popularity of wireless transmission technology has improved the efficiency of communication and information in daily life, the radio frequency transmission provides the conveniences and the feasibility of environment. In recent years, the RF wireless radio frequency system has been widely utilized in the daily life. As the mobile phone stations send out electromagnetic waves which may cause damages to human body, many research organizations have conducted relative researches to find out the interactive function between human body and electromagnetic waves. In recent years, RFID is more widely used in biomedical device applications. The human body contains 70% of water, this is an important factor that can not be ignored because the water molecules absorb radio waves and malfunction to implantable biomedical devices. Radio frequency technology can be built into an implantable bio-medical device to provide the device energy, to transmit the feedback signals and parameters, and to send out the instant and accurate physiological information. The simulation experiment of radiofrequency transmission via finite difference time domain method (FDTD) is conducted in this study to analyze humidity effects under various environments and adjust its transmission power , distance and frequency to achieve the maximum efficiency of receiver and best SAR performance.