本論文基於多輸入多輸出(Multiple Input Multiple Output, MIMO)系統技術提出一個新穎的無線射頻辨識(Radio Frequency Identification, RFID)電子標籤，以改善多重路徑衰減(Multi-path fading)對系統效能之影響。在順向連結(Forward link/Reader to tag)方面，所提的電子標籤能處理由正交極化關係的兩天線所接收到的訊號，改善順向連結品質;在反向連結(Reverse link/Tag to reader)方面，該標籤使用傳送分集(transmit diversity)技術，以改善提高反向連結反向散射訊號品質。本論文之實驗量測結果證實所提的電子標籤能有效地對抗多重路徑衰減。

This thesis proposed a novel radio frequency identification (RFID) tag based on the multiple input multiple output (MIMO) technique to improve the system performance under multi-path fading environment. For the forward link (Reader to tag), the tag can improve the performance of forward link by processing signals received from two orthogonal polarized antennas. For the reverse link (Tag to reader), the transmit diversity technique is adopted to improve the backscatter signal quality in reverse link. The experiment results demonstrate that the proposed tag is robust against the multi-path fading effect.

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