臺灣博碩士論文加值系統

本論文是以整流天線技術實現免電源的微波功率檢測器，其設計目標是以不損耗直流功率的情況下提升檢測器之電壓鑑別度與轉換效率。第一個電路為無電源之微波功率檢測器，其設計的方法是先利用本論文推導的結果選定檢測器內元件規格，再利用大訊號量測法擷取在大訊號下的檢測器阻抗值做功率匹配，以達到在單一功率點下有最佳的功率匹配效果。實製檢測器在輸入為7 dBm條件下的轉換效率由3%提升為29.4%，操作頻率為2.45 GHz，電路尺寸為17.9 mm×9.3 mm。
第二個電路為高效率微波功率檢測器，操作頻率為2.45 GHz，因為輸入訊號有大幅動態變化，所以設計一個可調整的匹配網路，可使在不同輸入功率的條件下仍有較佳的轉換效率。在輸入訊號由0-15 dBm的動態範圍中，未加匹配網路檢測器轉換效率為8%，而利用可調匹配網路之技術轉換效率增至28%，電路尺寸為42 mm×26.5 mm。

In this thesis, passive microwave power detectors with zero power consumption were developed based on the rectenna technique. The first passive power detector detects 2.45 GHz microwave power emitted in the wireless environment. The conversion efficiency is 29.4% at the input power of 7 dBm. The circuit was realized on FR4 substrate with the size of 17.9 mm×9.3 mm. To further enhance the conversion efficiency, a tunable matching circuit was designed in front of the microwave rectifying circuit. Because the internal impedance of the microwave rectifying circuit varies with the input signal level, the nonlinear internal impedance contour on Smith chart was measured and is matched by tuning the impedance matching network. The measured conversion efficiency was improved from 8% of the unmatched case to 28% for 0-15 dBm input power dynamic variation.

目錄 i
圖目錄 ii
表目錄 v
第一章 緒論 1
1.1 研究動機 1
1.2 論文架構 7
第二章 免電源之微波功率檢測器 8
2.1 免電源之微波功率檢測器介紹 8
2.2 格萊納赫整流電路 (Greinacher Rectifier) 12
2.3 檢測器節點電壓特性模擬 23
2.4 檢測器節阻抗匹配模擬 29
2.5 量測與實作 35
2.6 檢測距離測試 42
第三章 高效率之微波功率檢測器 44
3.1 可調式匹配網路簡介 44
3.2 最佳阻抗匹配點分析 45
3.3 輸入阻抗點與功率位準萃取 53
3.4 可調式匹配網路設計 55
3.5 可調式匹配網路製作與感測器特性量測 57
3.6 討論與未來工作 61
第四章 結論 62
參考文獻 63
作者簡介 68

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