Integration of RFID analog circuit and antenna design

• Main Authors: Chih-Hsiung Yang, 楊智雄
• Other Authors: Shun-Peng Shih
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/88175471023113960601

碩士 === 樹德科技大學 === 電腦與通訊研究所 === 95 === In this thesis, we study the integration of analog circuit of radio frequency identification systems (RFID) and signal test for antennas of different size. RFID comprise tag, reader and antenna. The results of test of integration show the analog circuit is functioning. The reader of RFID system transports signal from the reader’s coil to the tag’s coil by EM coupling. If the dimension of these two coils is not compatible, the signal received by the tag will be weak. This is due to the coupling coefficient of the two coil is small. We propose an RFID system additionally comprises an intermediate device that includes a first and second antenna coils connected together in a close loop format. In this intermediate device, the first coil can be optimized for communication with a reader, while the second coil can be optimized for communication with a tag. By this configuration, the dimension of the reader antenna coil and the tag antenna coil can be completely independent of each other and still keep the transmission of signal fluent. The results indicate the transmission distance between tag and reader could be extend to about 30mm.