| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 95 === Radio frequency identification (RFID) is currently a popular technology, and printed circuit board (PCB) manufacturing is a mature industry. Combining RFID and PCB could benefit each other. The topic of this work is to find a way of applying the RFID technology to PCB and then to verify the idea by theoretical analysis, simulation, and experiment results in this work. We start by developing our design according to restrictions on size limit, read distance requirement, and effect of metal traces, etc., that may be encountered when we try to embed RFID tags in PCB. We also bring up three designs for embedded PCB tags, and then choose the one that combines the chip with a microstripline-fed slot antenna as the desired embedded PCB tag. Finally, we did measurements on the embedded RFID tag, and obtained a maximum read distance around 30 cm no matter lodged in PCB or not. Such a long distance can not be achieved by attaching tags directly on PCB. We also did in-depth analysis, experimental measurements, and simulation verification for both of the adhesive and embedded PCB tags to compare their differences of performance. We found that the severe change of input impedance is the major reason affecting the impedance matching between the conventional antenna and the chip when they are attached on PCB. And it decreases the read distance drastically. However, the input impedance change of our antenna is small, when the antenna along with the chip is embedded in PCB. Thereby, it has a slight influence on read distance.
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