臺灣博碩士論文加值系統

本論文以採用立體與蜿蜒設計方式的多頻天線為研究目標，並提出兩種不同結構之天線，並選用介電常數為 的玻璃纖維板(FR4)，基板厚度為0.8 mm，長度為110 mm，寬度為60 mm作為板材，兩者皆以單極天線(monople antenna)作為設計基礎，所提出之天線工作頻段需滿足LTE700 (698 MHz-806 MHz)、LTE800 (790 MHz-862 MHz)、GSM (880 MHz-960 MHz)、DCS (1.71 GHz-1.88 GHz)、PCS(1.95 GHz-1.99 GHz)、PHS (1.88 GHz-1.93 GHz) 、UMTS (1.92 GHz-2.17 GHz) 、Bluetooth (2.4 GHz-2.4835 GHz)與WLAN (2.4 GHz-2.484 GHz)之頻段規範。首先，第一種天線以基板左方之延伸空間製作一具有多路徑(multiple Paths)與蜿蜒設計(meandering design)的立體(three-dimensional)單極天線作為輻射主體(main radiator)，利用單極天線與參考地耦合(couple)之方式來增加不足的頻段，再來分別於基板右上方和左下方之延伸處加上末端短路的金屬耦合段，並調整末端短路的金屬耦合段之長度與距離以達到最好的阻抗匹配，使此天線工作頻段能夠達到我們的所需，天線量測結果S11頻率以-6 dB作為標準，天線低頻的部分為700 MHz-1.03 GHz，阻抗頻寬為0.33 GHz，頻寬百分比為38%，高頻的部分為1.64 GHz-2.55 GHz ，阻抗頻寬為0.91 GHz，頻寬百分比為43%。第二種設計則是利用基板正前方延伸空間製作一個不同於天線一但也是採用多路徑與蜿蜒的立體形式設計之單極天線作為輻射主體，並和前者一樣利用末端短路的金屬耦合段接地並與主輻射體互相耦合加以調整阻抗匹配增加頻寬，此天線之末端短路的金屬耦合段設計於基板的左下方與右上方，不同於前者，在此僅利用機板正上方之空間，且在一定高度內不增加整體的寬度，並達到我們所設定之操作頻帶，最後天線量測結果S11頻率以-6 dB作為標準，天線低頻的部分為688 GHz-1.03 GHz，阻抗頻寬為0.315 GHz，頻寬百分比為39.8%，高頻的部分為1.6 GHz-2.65 GHz ，阻抗頻寬為1.04 GHz，頻寬百分比為48.8%，並將我們所設定之頻段規範包含其中。

Two kinds of LTE smart mobile antenna with multiband operation are proposed to work in the bands of LTE, GSM, DCS, PCS, PHS, UMTS, Bluetooth, and WLAN. The initial design consists of a three-dimensional meandering monopole antenna constructed on the extended region of the PCB to reduce the space and also acting as the main radiator operating in the bands of LTE, DCS, and PCS, PHS, and UMTS. Subsequently, by adjusting the coupling between the monopole antenna and the shorted stub, the GSM band is added and the impedance matching in the band of LTE is improved. Finally, an additional shorted stub is constructed to radiate in the WLAN. The numerical results show that the -6dB return-loss bandwidths are from 0.7 GHz to 0.985 GHz (0.285 GHz, 34%) for the lower band and from 1.64 GHz to 2.535 GHz (0.895GHz, 43%) for the higher band. The corresponding measured data are from 0.7 GHz to 1.03 GHz (0.33 GHz, 38%) for the lower band and from 1.64 GHz to 2.55 GHz (0.91 GHz, 43%) for the higher band. A second antenna is designed by replacing the coupling stub in the first antenna with a wider one. The wider stub is placed on the top of the substrate so that more space is available on the ground plane, resulting in more suitable application in the mobile device. The numerical results show that the -6dB return-loss bandwidths are from 0.7 GHz to 0.9668 GHz (0.2688 GHz, 27.2%) for the lower band and from 1.5953 GHz to 2.6 GHz (1.0047 GHz, 47%) for the higher band. The corresponding measured data are from 0.688 GHz to 1.03 GHz (0.315 GHz, 39.8%) for the lower band and from 1.61 GHz to 2.65 GHz (1.04 GHz, 48.8%) for the higher band.

摘要 - 1 -
目錄 - 3 -
圖目錄 - 4 -
表目錄 - 6 -
第一章 序論 - 7 -
1-1 前言 - 7 -
1-2 研究動機與背景 - 9 -
1-3 研究目的 - 9 -
1-4 內容提要 - 10 -
第二章 具多頻操作的LTE智慧型手機天線:設計一 - 11 -
2-1 概述 - 11 -
2-2 理論基礎 - 11 -
2-2-1 偶極天線基本理論與結構(dipole antenna) - 11 -
2-2-2 單極天線基本理論與結構(monopole antenna) - 14 -
2-2-3 多頻帶單極天線 - 15 -
2-2-4 Planar Inverted F Antenna基本理論與結構49 - 16 -
2-3 天線結構 - 17 -
2-4 結果分析 - 20 -
2-4-1 反射係數(S11) - 20 -
2-4-2 輻射場型(radiation patterns) - 21 -
2-4-3 天線增益(Gain) - 30 -
2-4 參數探討 - 35 -
第三章 具多頻操作的LTE智慧型手機天線:設計二 - 39 -
3-1 天線概述 - 39 -
3-2 天線結構 - 39 -
3-3 結果分析 - 44 -
3-3-1 反射係數(S11) - 44 -
3-3-2 輻射場型(radiation patterns) - 45 -
3-3-3 天線增益(Gain) - 54 -
3-4 參數探討 - 60 -
第四章 結論 - 64 -
參考文獻 - 64 -

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