可獨立開關之四頻天線

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姓名

王登胤(Deng-Yin Wang) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

可獨立開關之四頻天線
(Independently Switchable Quad-band Antennas)

相關論文

★ 應用於微波之多頻帶通濾波器之設計	★ 使用可開關式帶通濾波器之低相位雜訊雙頻振盪器研製
★ 共平面波導饋入槽孔偶極天線之寬頻與多頻應用	★ 可具任意通帶之可調式多工器
★ 利用非對稱步階式阻抗設計寬通帶寬止帶雙工器	★ 基於散佈式耦合饋入架構之可開關式帶通濾波器
★ 共平面波導饋入之寬頻雙圓極化天線	★ 基於多共振路徑所設計之印刷式多頻帶天線
★ 四通道可切換式帶通濾波器之研究	★ 雙模態寬阻帶之基板合成波導濾波器
★ 微小化倍頻壓抑直交分合波器之研製	★ 可繞式小型偶極天線之研製
★ 使用多重模態共振器實現多功能帶通濾波器	★ 應用於Radio-over-Fiber系統之超高速微波光子發射器
★ 使用長饋入線架構研製小型且具有高隔絕度的多工器	★ 具有寬截止頻帶的帶通濾波器之研製

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摘要(中)

本論文中，利用在步階式阻抗共振器(Stepped-impedance resonator, SIR)末端加上二極體負載製作成可開關式的帶通濾波器，並在濾波器輸出端接上寬頻天線(Broadband Antenna),形成可開關之四頻天線。負載的二極體可改變步階式阻抗共振器共振條件。由於散佈式耦合的饋入技術的低負載效應，因此不需要複雜的匹配網路來設計多頻帶的電路。

四頻帶通濾波器電路架構包含二分之一波長步階式阻抗共振器、四分之一波長步階式阻抗共振器。每個通帶皆由一對共振器控制可增加設計自由度，並且使用散佈式耦合技術減少頻帶間的負載效應，即可將四個帶通濾波器整合在一起，並將二極體負載接在共振器末端以設計可獨立開關四個頻帶的可調式裝置。

寬頻天線為微帶線結構，包含單極輻射體，其架構為一半波長步階式阻抗共振器，以拉近倍頻之方式形成超寬頻通帶，並具有線性極化特性。將濾波器輸出端連接於寬頻天線之饋入端，作為通帶選擇器，即可實現多頻天線之架構。

本論文中以兩種不同介電常數跟介質損耗之電路板材進行實驗，並將可開關之天線與純被動天線加以比較，且輔以模擬結果，與設計理論，實測結果相互驗證。

摘要(英)

In this thesis, we made switchable bandpass filters by adding diodes to the end of Stepped-impedance resonator (SIR). Then we combined broadband antennas to the output port of bandpass filters to form switchable quad-band antennas. As we switching the loading diodes, the resonance condition of SIRs would be changed. By low loading effect of distributed fed-in technique, there is no need to design complex matching network for multiband circuits.

Quad-band bandpass filters include quarter-wavelength and half-wavelength SIRs. Each passband is controlled by one pair of resonators and it will increase the degree of freedom to design. By the low loading effect of distributed coupling between passbands，four bandpass filters could be combine together, and the diodes at the end of resonators could perfume the switchable independently device.

Broadband antennas were built on microstrip line structure. The monopole radiator is a half-wavelength SIR. It performs a wide passband by pull down the harmonic frequencies, and it has linear polarization characteristics. We can implement multiband antennas by adding bandpass filters on the input port of antennas to make the passband selection.

We will perform experience on two kinds of substrates which have different relative dielectric constants and loss tangent values in this thesis. We will also compare the switchable antennas with passive ones. Finally we will identify our research by performing full-wave EM simulation and implement measurement.

關鍵字(中)

★ 可開關
★ 多頻天線
★ 寬頻天線
★ 四頻天線

關鍵字(英)

★ switchable
★ multiband antenna
★ broadband antenna
★ quadband antenna

論文目次

論文提要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 X
第一章緒論 1
1-1 研究動機 1
1-2 文獻回顧 2
1-3 章節介紹 7
第二章寬頻天線 8
2-1 簡介 8
2-2 步階式阻抗共振器之基本原理 8
2-2 寬頻天線的基本原理 10
2-3 天線設計參數分析 10
2-4 寬頻天線之輻射場型 16
2-5 電流分布與模態分析 20
2-6 結論 21
第三章可獨立開關之四頻帶通濾波器 23
3-1 簡介 23
3-2 特徵阻抗比Rz < 1之步階式阻抗共振器 23
3-3 四頻帶通濾波器的設計理論 28
3-4 結論 34
第四章可獨立開關之四頻天線 37
4-1 簡介 37
4-2 阻抗分析 37
4-3 純被動之四頻天線模擬與量測結果 39

4-3.1 S參數之模擬與量測結果 41
4-3.2 輻射場型之模擬與量測結果 43
4-4 可開關之四頻天線 53
4-4.1 可開關四頻天線之設計 53
4-4.2 可開關四頻天線之模擬 54
4-4.3 S參數之模擬與量測結果 56
4-4.4 輻射場型之模擬與量測結果 68
4-5 天線效率 93
4-5.1 純被動四頻天線之效率與能量傳遞 93
4-5.2 可開關四頻天線之效率與能量傳遞 93
4-6 結論 94
第五章總結 96
參考文獻 103

參考文獻

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指導教授

凃文化(Wen-Hua Tu)

審核日期

2015-7-27

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