本論文探討7 GHz主動式智慧中繼器(Active Smart Repeater)的設計與實現。研究聚焦於可重構智慧表面(RIS)技術在6G無線通訊中的應用，特別是在系統架構、天線設計、和性能評估等方面。
論文首先設計了一個工作於6.9-7.1 GHz頻段的主動式RIS系統，採用空氣夾層式微帶天線陣列結構，實現了在目標頻段-10 dB以下的反射損耗，隔離度達到20dB以上。同時開發了三種不同類型的相移器方案，包括基於SPDT開關的二相位調變器、TGP2105-SM的6位元數位相移器，以及使用SP4T開關的四相位調變器，插入損耗分別為12 dB、9 dB和8 dB。實驗結果顯示相移器的插入損耗與系統最大訊雜比(SNR)呈現明顯的相關性。
此外，論文針對3.5 GHz頻段進行了貼片天線和八木天線兩種不同結構的比較研究。實驗結果表明，兩種天線在最佳相位配置下的性能相近，但八木天線型RIS在最差相位狀態下表現出更好的性能。研究結果不僅驗證了不同天線結構對RIS性能的影響，也為未來RIS天線設計提供了重要的參考依據。

This thesis investigates the design and implementation of a 7 GHz Active Smart Repeater. The research focuses on the application of Reconfigurable Intelligent Surface (RIS) technology in 6G wireless communications, particularly in system architecture, antenna design, and performance evaluation.
The paper first presents the design of an active RIS system operating in the 6.9-7.1 GHz band, utilizing an innovative air-gap microstrip antenna array structure. The system achieves a reflection loss below -10 dB in the target frequency band, with isolation exceeding 20 dB. Three different types of phase shifters were developed: a two-phase modulator based on SPDT switches, a 6-bit digital phase shifter using TGP2105-SM, and a four-phase modulator using SP4T switches, with insertion losses of 12 dB, 9 dB, and 8 dB respectively. Experimental results demonstrate a clear correlation between the phase shifter's insertion loss and the system's maximum Signal-to-Noise Ratio (SNR).
Furthermore, the study compares two different antenna structures - patch antenna and Yagi antenna - in the 3.5 GHz band. Results show that while both antennas perform similarly under optimal phase configuration, the Yagi antenna-based RIS exhibits superior performance under worst-case phase conditions. These findings not only validate the impact of different antenna structures on RIS performance but also provide valuable reference for future RIS antenna design.

論文審定書 i
誌謝 ii
摘要 iv
Abstract v
目錄 vi
圖次 viii
表次 xi
第一章 緒論 1
1.1研究背景 1
1.2可重構智慧表面 3
1.2.1 RIS架構介紹 3
1.3 被動式RIS與主動式RIS差別 5
1.4 章節規劃 7
第二章 主動式 RIS架構升頻 8
2.1 7GHZ RIS單元及陣列介紹 8
2.1.1 微帶天線理論 9
2.1.2微帶天線設計 13
2.1.3陣列理論 17
2.1.4 微帶天線陣列設計 19
2.2 RIS單元-元件介紹 23
2.2.1 RIS系統元件介紹 23
2.2.2 自製元件介紹 26
2.3 主動式RIS實驗量測及量測平台介紹 34
2.3.1 數位量測平台 35
2.3.2 兩單元(一收一發)主動式RIS量測結果 37
第三章 天線模式與結構模式的測試 41
3.1 貼片天線與八木天線之模擬 41
3.2 貼片天線與八木天線之比較 50
第四章 結論與未來展望 64
4.1研究總結 64
參考文獻 66

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