臺灣博碩士論文加值系統

本文提出一應用頻率轉換式主動集成天線之低雜訊降頻器設計，
原來架構中的矩形波導，以容易與電路集成的平面槽孔圓形微帶天線取代，並整合本地振盪器與混波器功能，以單一電晶體設計一自我混頻振盪器，最後與天線整合成一頻率轉換型主動集成天線，讓衛星信號直接降頻，可以減少在線路中的傳輸損失。為了取出中頻信號，設計一環形微帶濾波器，同時兼具定點陷波以及低通的濾波功能，同時亦應用環形微帶諧振器，作振盪器設計，代替一般低雜訊降頻器常使用的介質振盪器。最後再加上高增益的中頻放大器，以放大中頻訊號至直播衛星系統規定的位準。本文所提出的設計，將簡化傳統低雜訊降頻器的電路，並且更容易去製作裝設簡單的平面陣列天線。未來，我們可應用本文所提出的架構於低軌道衛星通訊系統的接收機集成電路設計。

This paper presents the design of a low noise block-converter (LNB) using a frequency-conversion type active integrated antenna (FCAIA). A planar microstrip-circular-slot antenna, which is easier to integrate with other components, will replace the rectangular waveguide in conventional LNB. A self-mixing oscillator (SMO) with single transistor is designed to combine the function of local oscillator and mixer. Then, it is integrated with proposed antenna to complete the design of the FCAIA. Satellite signals received from FCAIA is direct converted to IF range. To properly filter the IF signals, a microstrip-ring filter having both the properties of fixed-frequency-rejected and low-pass filters is proposed. It is also applied to the design of SMO as the role of resonator, replacing dielectric resonator that is generally used in conventional LNBs. A high gain IF amplifier must be used to amplify the signal level to conform the specification of the direct broadcast satellite system. The proposed design of LNB will simplify the circuits of conventional ones. It’s also easier to manufacture the planar array antenna, which is easy for setting. In future, we can apply the architecture presented in this paper to design the integrated circuit of the receiver in Low Geo Orbit systems.

誌謝...........................................ii
摘要...........................................iv
ABSTRACT........................................v
目錄...........................................vi
表錄.........................................viii
圖錄...........................................ix
1. 緒論...................................1
1.1 前言...................................1
1.2 研究動機與目的.........................6
1.3 論文架構...............................7
2. 直播衛星接收系統與低雜訊降頻器架構.....8
2.1 直播衛星接收系統.......................8
2.1.1 接收天線..............................10
2.1.2 低雜訊降頻器..........................14
2.1.3 衛星接收機............................20
2.2 衛星接收實例..........................23
3. 改良式低雜訊降頻器設計................29
3.1 基本架構..............................29
3.2 主動集成天線設計......................31
3.2.1 微帶天線..............................31
3.2.2 振盪器單元............................34
3.2.3 混波原理..............................37
3.2.4 整合設計..............................39
3.3 中頻濾波器設計........................42
3.4 中頻放大器設計........................46
4. 模擬與實作分析........................47
4.1 單元設計..............................47
4.1.1 頻率轉換式主動集成天線................47
4.2 中頻放大器............................59
4.2.1 中頻濾波器............................62
4.3 整體特性分析..........................63
5. 結論..................................65
參考文獻 68
自傳 71

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