Design of Multi-directed Antenna for Near Field Communication

• Main Authors: Guo-Yao Liao, 廖國堯
• Other Authors: 林丁丙
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/d2dkht

碩士 === 國立臺北科技大學 === 電子工程系碩士班（碩士在職專班） === 103 === In recent years, due to the evolution of mobile communication technology, there have been many different communication technology which make the telecommunication industry flourish. According to different transmission distance, the communication technology can be divided into two categories. One is long distance wireless communication, the other one is the short distance wireless communication technology. The study of Near Field Communication is belonging to one of the short distance communication. In this article, we focused on multi-directed transmission. First, we set up a transmitter coil build in high permeability material by using the characteristics of high permeability coefficient of the material, which makes the near-field antenna area can be significantly narrowed. By the Biot-Savart law, the current in three different dimensions can produce three different magnetic fields. Therefore, we use via and filaments to provide current in three different dimensions at the same time. Next, we move via to control the number of turns. By this way, the transmitting antenna can provide a two or three directed magnetic field. Through simulation, we can verify this design to receive same mutual inductance in three different dimensions. Compare to the traditional near-field coil, this system can receive more directional mutual in the same self-inductance. Finally, through the measurement results which compare to traditional coil, this design can provide more directed induction distance.