臺灣博碩士論文加值系統

本論文主要分別針對藍芽(Bluetooth)無線射頻身份辨識系統(RFID)與無線超寬頻系統 (Ultra-wideband；UWB) 通訊系統設計了五個平衡不平衡轉換器。平衡不平衡轉換器主要是製作於FR4的基板上，其量測結果皆由安捷倫 E8362A網路分析儀所量測完成。
第一個平衡不平衡轉換器設計於藍芽無線通訊系統上。此一平衡不平衡轉換器的設計主要使用一個混合型耦合器和一條四分之一波長。在2.4GHz頻段上量測結果，返回損失有-22.8dB，在插入損失方面S21和S31為-3.77dB和-3.9dB，相位差為176.5度。
第二個平衡不平衡轉換器設計於藍芽無線通訊系統上。此一平衡不平衡轉換器的設計主要利用支狀型平衡不平衡轉換器使用步階阻抗的方式改善返回損失的設計。在1.95GHz至2.88GHz上量測結果，返回損失小於-15dB以下，在2.1GHz到2.88GHz上，強度大小平衡度在±0.25dB以內，在1.95GHz到2.88GHz相位差錯誤在±3度以內。
第三個平衡不平衡轉換器設計於無線射頻身份辨識系統上。此一平衡不平衡轉換器使用耦合線段與步階阻抗來進行設計。在第一頻段854MHz到970MHz量測上，返回損失小於-15dB，強度大小平衡度在0.5dB以內，相位差錯誤在0.5度以內。在第二頻段2.42GHz到2.5GHz量測上，返回損失小於-15dB，強度大小平衡度在0.012dB以內，相位差錯誤在1.6度以內。
第四個與第五個平衡不平衡轉換器設計於無線超寬頻系統上。平衡不平衡轉換器使用缺陷接地結構來進行縮小面積的設計。第四個平衡不平衡轉換器在3.1GHz到9.5GHz頻段量測上，返回損失小於-10dB，強度大小平衡度在0.64dB以內，相位差錯誤在5.5度以內。第五個平衡不平衡轉換器在3.1GHz到9.25GHz頻段量測上，返回損失小於-14dB，強度大小平衡度在0.36dB內，相位差錯誤在7.5度以內。

In this thesis, five different baluns are presented for the application in Bluetooth RFID and UWB systems. Those baluns were all fabricated in FR4 board and results were measured by an Agilent E8362A PNA series network analyzer.
The first balun was designed for Bluetooth systems and composed of a hybrid coupler and a connecting one-quarter wavelength line. The return loss was -22.8dB, the insertion losses S21 and S31 were -3.77dB and -3.9dB, and the phase difference was 176.5 degree at 2.4GHz. To improve return loss, branch line with stepped impedance resonators was used in the second balun model for Bluetooth systems. Significant improvements could be observed. Return loss were less than -15dB from 1.95GHz to 2.88GHz, the range of magnitude imbalance were within ±0.25dB from 2.1GHz to 2.88GHz, and the phase difference error was within ±3 degree from 1.95GHz to 2.88GHz.
The third balun was designed for RFID system. The coupled transmission line and stepped-impedance resonator were using in this design. The measured return loss of the first band was less than -15dB, the magnitude imbalance was within 0.5dB, and the phase difference error was within 0.5 degree from 854MHz to 970MHz. The measured return loss of the second band is loss than -15dB, the magnitude imbalance was within 0.012dB, and the phase difference error was within 1.6 degree from 2.42GHz to 2.5GHHz.
The fourth and last baluns were designed for UWB system. Those baluns were designed using defected ground structure to reduce the overall size. The return loss of the fourth balun was less than -10dB, the magnitude balance was within 0.64dB, and the phase difference error is within 5.5 degree from 3.1GHz to 9.5GHz. The return loss of the last balun was less than -14dB, the magnitude balance was within 0.36dB, and the phase difference error was within 7.5 degree from 3.1GHz to 9.25GHz.

中文摘要 I
ABSTRACT II
目錄 III
圖目錄 VI
表目錄 IX
第一章 緒論 1
1-1 研究背景與動機 1
1-2 藍芽系統簡介 2
1-3 RFID頻段動機與簡介 5
1-4 超寬頻頻段動機與簡介 8
第二章 支狀型平衡不平衡轉換器 10
2-1 支狀型平衡不平衡轉換器 10
2-2 支狀型平衡不平衡器模擬與量測 14
2-3 三階支狀型平衡不平衡器 18
2-4三階支狀型平衡不平衡器模擬與量測 20
第三章 雙頻帶平衡不平衡轉換器 25
3-1 T型雙頻帶反相器 25
3-2 耦合型雙頻反相器 27
3-3 步階式阻抗共振器 31
3-4 設計RFID中主動式與被動式頻帶0.915GHz與2.45GHz 34
3-5 雙頻帶平衡不平衡轉換器模擬與量測 37
第四章 超寬頻平衡不平衡轉換器 43
4-1 提出超寬頻平衡不平衡轉換器 43
4-2調校線段寬度對提出平衡不平衡轉換器返回損失的影響 44
4-3 提出超寬頻平衡不平衡轉換器模擬與量測 48
4-4改良提出超寬頻平衡不平衡轉換器 52
4-5調校線段寬度對改良提出平衡不平衡轉換器返回損失的影響 53
4-6 改良提出超寬頻平衡不平衡轉換器模擬與量測 59
4-7 提出五種平衡不平衡轉換器電路特性比較表 63
第五章 結論 65
參考文獻 66

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