| Summary: | 碩士 === 國立勤益科技大學 === 電子工程系 === 102 === This paper proposed a development of near field communication system (Near Field Communication; NFC) array antenna design for extending the range of NFC signals receiving and transmitting. The first
step is designing various single antennas at 13.56MHz for NFC signal receiving and transmitting, and then combining single antenna into array
configurations. The array antenna impedance matching problems become very important issues to achieve radiation efficiency and need to use adequate inductors and capacitors circuit configurations and special selected values to resolve the problem. This research is conducted using electromagnetic simulation software IE3D for 13.56MHz single antenna design, and by using AUTOCAD for the circuit layout, and then applied the PCB engraving machine for the final physical antenna output. Combining each NFC single antenna and adding serial/parallel capacitor Cr to achieve the required return loss value. This work is done by measuring the characteristics |S 11 | of adjourned antenna, and adjusting the capacitor Cr to meet the return loss value at 13.56MHz. The final NFC antenna array design is completed by repeated adding all the single antennas on and adjusted the capacitors to satisfy required return loss.
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