本論文提出一款以一般印刷電路板製程實現之六位元射頻辨識標籤電路。此款電路以共平面波導(Coplanar Waveguide, CPW)結構，搭配多重折疊式步階阻抗諧振器，以多層結構雙層基板之形式實現。
首先，本研究從無晶片射頻辨識標籤技術之回顧開始，接著說明發展低成本無晶片射頻辨識標籤之緣由，再將現有文獻之無晶片射頻辨識標籤技術分為基於時域反射法、基於頻譜特徵與基於振幅／相位反向散射調變三大類，最後再針對其中之基於頻譜特徵之多重諧振器設計之電路架構進行實驗探討。
透過文獻之探討，標籤之設計利用折疊式步階阻抗諧振器，以CPW饋入形式沿著訊號線蝕刻三個步階阻抗諧振器於基板背面，並另外使用一基板蝕刻三個諧振器成反向180°正對排列呈現，再將CPW之接地面以銅線空氣橋連接抑制因使用該結構導致不連續所激發出的耦合槽線模態，並以諧振器之存在與否進行傳輸係數模擬。再以夾板式接頭連接輸入與輸出端並將兩基板三層結構以適當間距疊合並以塑膠鉚釘加以固定，復接上向量網路分析儀以量測整體結構之散射參數。最後使用四支超寬頻天線分別作為讀取器及標籤之收發天線，並以手持式網儀作為讀取器於無反射實驗室進行標籤編碼回傳之驗證以實現射頻辨識系統。

This thesis presents circuit designs for 6-bit radio frequency identification (RFID) tags, which were produced by printed circuit board manufacturing process. These circuits feature a coplanar waveguide (CPW) with folded stepped impedance resonators (folded SIRs), forming multilayer dual-substrate structures.
This research begins with reviewing chipless RFID technology and explored the reasons that prompted the development of chipless RFID tags, and categorized it into three types: time–domain reflectometry–based, spectral signature–based, and amplitude/phase backscatter modulation–based. Following that, an experiment was conducted by the spectral signature–based structures.
According to the literatures, we designed tags by using three folded SIRs etched in the back of a substrate in CPW configuration along, and another three folded SIRs were etched in the back of another substrate in reverse order. Air bridges were used to connect the ground planes of the CPW, thus suppressing the coupled slot-line mode induced by the discontinuous configuration. The presence or absence of resonators was adopted for simulation of the structure’s transmission coefficients. Subsequently, straddle type connectors were fixed to the input and output ends of the structures, the multilayer dual-substrates were overlaid with an adequate space and fixed using plastic screws. A vector network analyzer (VNA) was used to measure the transmission coefficients of the structures.
Finally, four ultra-wideband antennas were used for reader and tags transmit and received ends, and a hand-held VNA was adopted as an RFID reader to verify the RFID system in an anechoic chamber.

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