多頻帶開槽式天線設計於無線通訊之應用

Multiband Slot Antenna Design for Mobile Communication Applications

王棓熲(Pou-Jeong Wang)

指導教授 ： 林怡成

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.10566

摘要

在本論文中，我們提出一U型開槽式天線之設計以因應多頻段操作之需求。我們在這支天線的開路端，置入一隔離的金屬帶，用以改善低頻匹配不佳的問題。我們尚採用F型饋入線之設計，可於高頻段另增一頻帶，其操作範圍落於1700 MHz至2500 MHz之間。此外，我們於天線短路端連接一L型金屬帶並將之延伸至天線區域內，可以進一步增進高頻操作頻帶之頻寬，將其上限拓展至2700 MHz。我們於論文中詳盡分析上述三種元素的功能，並且歸納出一些重要的設計參數，幫助我們理解天線運作之機制，以及有效掌控其阻抗匹配之特性。最後，我們以上述設計理念為本，實現一天線的模擬設計，根據其量測數據，我們實作的天線場型和頻寬皆與模擬結果相似。總結來說，我們所完成之天線設計具有足夠的操作頻寬，可應用於當今的第二代、第三代及第四代(LTE)無線行動通訊系統。

關鍵字

四分之一波長開槽式天線 ； 頻寬增進 ； 多頻帶操作

並列摘要

In this thesis, a U-shaped slot antenna is proposed for multiband operations. At the open end of the slot aperture, the antenna is embedded with an isolated metallic strip which is used to improve the impedance matching in the low band. The slot antenna is fed by an F-shaped stub which may generate an extra high band for the 1700 MHz to 2500 MHz operation. Another feature of the proposed antenna is the L-shaped metallic strip connected to the inner edge of the shorting end, which may lead to an enhanced bandwidth in the high band operation up to 2700 MHz. The function of the isolated metallic strip, the F-stub feeding structure, and the L-shaped strip are analyzed in detail that may help to understand the operating mechanism and to provide design guidelines for the impedance matching design. Finally, we have built a prototype based on the proposed design. The measured data show that the impedance bandwidths and radiation patterns well agree with the simulated results. Overall, the proposed antenna has a sufficient operating frequency range which is suitable for mobile communication systems covering 2G/3G/4G (LTE) wireless standards.

並列關鍵字

quarter-wavelength slot antenna ； bandwidth enhancement ； multiband operations

參考文獻

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