RFID Antenna for Laptop Application

• Main Authors: Chi-FangTsai, 蔡奇芳
• Other Authors: Wen-Hsi Lee
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/76219587634758979562

碩士 === 國立成功大學 === 電機工程學系專班 === 98 === Radio frequency identification (RFID) system communicates with each other by using electromagnetic wave in the air through the antenna of readers and tags. The reader antenna plays an important role of receiving and demodulating signals from the tag antenna. The performance of the reader antenna will directly affect the transmission distance. The research mainly focuses on the RFID antenna design for laptop application. The proposed antenna acting as an internal laptop antenna next to the touch pad is designed by using rectangular spiral coil antenna. The proposed RFID antenna for small distance transmission worked as the reader antenna to identify the users’ smart card. The research is discussed by using near field coupling type antenna. The proposed rectangular spiral coil antenna with inductance produces a magnetic field in the near field to induce the tag antenna. The complex RF signal interference and mechanism in the laptop seriously affects the radiation performance of the antenna. To simulate the effect of the rectangular spiral coil antenna in the laptop, we establish a reasonable environment modal in EM simulation software and discuss the improvement of the performance of the antenna in the metal environment by implementing the magnetic material. It is seen the agreement of the construction prototype and the measurement result matches the theory modal and the simulation result. The result shows the proposed RFID antenna is suitable for laptop application.