臺灣博碩士論文加值系統

本論文主要是探討適用於現今無線通訊技術之天線如何設計與應用於常見之無線通訊裝置中。在本論文中，首先提出一個適用於超寬頻系統之橋接點十字型單極天線。利用嵌入槽孔的方式，使此超寬頻橋接點天線在與無線區域網路通訊技術重疊之5 GHz 頻段產生帶拒操作特性，以降低不同無線通訊技術之裝置間的訊號干擾，並且詳細探討嵌入槽孔的帶拒機制與所產生的帶拒特性之關係。另外本天線設計也改善了一般單極天線在場型上的缺點，在高頻操作時仍能保有良好的全向性輻射場型。
接著本論文提出一結合寬頻槽孔天線與單極天線、適用於超寬頻系統之混合型天線設計。其中，以寬頻槽孔天線提供超寬頻之低頻頻段，單極天線則負責超寬頻之高頻頻段。如此可省略大部份超寬頻天線為了改善與無線區域網路重疊之5 GHz 頻段之訊號干擾問題所需之額外的帶拒機制。並且，此天線採平面印刷天線設計，包含接地面僅有34 mm × 30 mm，適用於大多數之無線通訊行動裝置。
最後本論文提出一個適用於無線區域網路IEEE 802.11n之MIMO單極槽孔天線。利用兩個長度不一的單極槽孔之共振模態，結合成一個符合IEEE 802.11n之操作頻帶的單極槽孔天線模組。將模組對稱放置於接地面上方後，再把一個隔離元件嵌入於天線模組之間，使兩天線模組間之隔離度也能擁有兩個共振模態，進而提高在無線區域網路之操作頻帶內的最小隔離度。此天線同樣採用平面印刷天線設計，包含接地面僅有50 mm × 20 mm，適用於常見之USB dongle或大多數的無線通訊行動裝置。

This dissertation is studied about the antenna for recent wireless communication technology how to design and apply to the major mobile wireless devices. Firstly, an access point cross monopole antenna which is suitable for Ultra-wideband (UWB) technology is proposed in this paper. By embedded a slot in the monopole antenna, the band-rejected characteristic has been generated at about 5 GHz, which can avoid interference between UWB system and WLAN system. We also studied the relationship between the slot or slit for the band-rejected mechanism and the generated band-rejected performance. Moreover, the proposed antenna also improved the drawback of the radiation pattern for traditional monopole antenna. In the higher operating frequency, proposed antenna also can be maintaining a good omni-directional radiation pattern.
Next, a hybrid antenna which combines a broad band slot antenna and a monopole antenna suitable for UWB application is proposed. The slot antenna can generate lower band of UWB, and the monopole can generate higher band of UWB. The method can omit band-rejected mechanism which used to avoid interference between UWB and WLAN system. Furthermore, the antenna is fabricated on FR4 substrate. The overall size of the proposed antenna is 34 × 30 mm2, which meet the requirement of most wireless mobile communication devices.
The last, a monopole slot MIMO antenna for WLAN is proposed. The MIMO antenna designs combining two resonant modes with different length monopole slot antenna and satisfy the WLAN requirement. At the same time, by embedded a narrow slit between the MIMO antenna modules, isolation of the proposed antenna can obtain two resonant modes, and the isolation can be improved at WLAN band. The dimension of the proposed antenna is only 10.5 × 20 mm2, which can suitable for the USB dongle or major wireless mobile devices.

摘要 i
英文摘要 ii
致謝 iii
目次 iv
表目錄 v
圖目錄 v i
第一章 序論 1
1.1 研究動機 1
1.2 文獻導覽 3
1.3 論文提要 5
第二章 適用於超寬頻系統的橋接點單極帶拒天線設計 6
2.1三種單頻帶拒的超寬頻橋接點天線之特性比較 7
2.2具有全向性輻射特性的雙頻帶拒之超寬頻橋接點天線設計 18
2.2.1 天線設計原理 18
2.2.2 實驗與模擬結果分析 20
第三章 適用於超寬頻系統的平面混合型天線設計 26
3.1天線設計原理 26
3.2實驗與模擬結果分析 28
第四章 適用於IEEE 802.11n的USB dongle天線設計 41
4.1天線設計原理 43
4.2實驗與模擬結果分析 45
第五章 結論 67
參考文獻 69
著作表(~2011/07) 74

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