應用於無線辨識系統之多重環形電感標籤天線

Abstract

無線辨識系統（Radio Frequency Identification, RFID）近年來發展迅速，其應用範圍包含服務業、行銷、工業、製造業以及物流系統。由於資料的存取可以使用無線辨識系統的技術達成完全自動化目的，具有節省人力成本以及大幅縮短作業時間之優點，因而使得無線辨識系統成為值得投入人力與資源進行開發研究的技術之一。 在無線辨識系統的操作上標籤應答器扮演重要之角色，其中應答器上之天線負責訊號的傳送與接收，而天線之特性悠關應答器的接收範圍與應答器上微晶片能否正常工作，因此本論文之研究即為設計一操作於UHF頻段之RFID標籤天線，設計上之重點在於需考量輻射特性及天線與微晶片間之阻抗匹配，本論文之設計採用偶極天線架構並提出多重電感性圓環之匹配網路，偶極天線具有良好的輻射特性，而多重電感性圓環匹配網路則具有增加調整天線輸入阻抗之自由度並使天線與微晶片間具有寬頻之阻抗頻寬，最後實作上使用PET材料作為基板，並以印刷技術將天線印製於基板上。

The development of Radio Frequency Identification (RFID) systems has increased rapidly in recent years. RFID is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. RFID is popularly applying to many fields, for example, use in identifying objects in warehousing, supply chain management, control and other automation processes and so on. Thus, it has some merits of low personnel matters cost and reduce the operating time. Hence, the RFID is an important technology nowadays. Tag responder plays an important role in RFID system. The antenna on the responder transfers signal between reader and responder. Reading range of the responder and function of the chip depend on performance of the antenna. A RFID tag antenna operating at UHF band is proposed in this work. The most important considerations for design are radiation and impedance matching. A dipole antenna with matching network constructed by multiple inductive loops was chosen in this work. The dipole antenna has good radiation. The multiple inductive loops increase degree of impedance matching and impedance bandwidth. At the end, the proposed antenna was printed on the PET substrate.