應用於無線通訊之共面波導饋入天線設計

CPW-Fed Antenna Design for Wireless Communication applications

劉進豐(Chin-Feng Liu)

指導教授 ： 鄭士康

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.10223

摘要

在此篇論文中,我們設計了一個工作在3.1GHz到10.6GHz的共面波導饋入的超寬頻單極天線和一個工作在2.4GHz到2.5GHz和5.15GHz到5.85GHz的雙頻天線(應用於IEEE 802.11a/b/g)。
此超寬頻單極天線的增益大致在2dBi到4dBi的範圍中，所以在3.1GHz到10.6GHz的工作頻帶內擁有良好的增益平坦度。此一天線的總大小約3公分乘以3公分，小於其他寬頻天線設計。另外，為了要多了解一些此天線的特性，我們也做了一些此天線的參數分析。為了避開HYPERLAN/2的頻段5.15GHz到5.35GHz跟IEEE 802.11a的頻段5.725GHz到5.825GHz，我們在原來天線上作了一個隙縫來製造出一個新的共振在5.5GHz附近，來濾掉此一頻率附近的訊號。這個方法不僅可以濾掉5GHz到6GHz的頻帶,還可以使此天線在高頻10GHz附近的增益增加。此一平面天線可廣泛的應用於超寬頻系統。
我們也發展出一個新的方法去設計槽孔雙極天線，以獲得更多的頻段跟達成更小的體積。我們使用此一方法設計一個工作頻帶在5GHz到6GHz，應用於IEEE 802.11a，大小為1.5公分乘以1.6公分的天線。另外又設計一個工作頻帶在2.4GHz到2.5GHz和5.15GHz到5.85GHz，應用於IEEE 802.11a/b/g，大小為2公分乘以2.2公分的天線。

關鍵字

共面波導 ； 天線

並列摘要

In this thesis, we have designed the monopole antenna over frequencies 3.1-10.6GHz for UWB applications and the dual-band antenna over the interested spectrum 2.4-2.5GHz and 5-6 GHz for WLAN applications such as IEEE 802.11a/b/g using coplanar waveguide as the feeding transmission line. The antenna gain is about 2dBi to 4dBi which corresponds to a good gain flatness characteristic within the UWB spectrum. The total antenna size is about 30mm x 30mm, which is small compared to some wideband slot antenna designs. A parameter study is given to understand the UWB antenna behavior. In order to block the present WLAN bands, which are 5.15 to 5.35 GHz for HYPERALN/2 and 5.725 to 5.825 GHz for IEEE 802.11a, a slip is inserted in the designed UWB antenna to block the original resonance at about 5.5 GHz. The notched method not only rejects the band of 5 – 6 GHz, but also produces a higher gain in 10 GHz compared to the normal case. This novel antenna can be used in the very wideband application such as UWB system.

In addition, we propose a new method to design the slot dipole antenna in order to get more bandwidth and compact size. We use this method to design a WLAN antenna works on 5-6 GHz in application of IEEE 802.11a with the dimensions of 15mm × 16mm for IEEE 802.11b/g and a dual band antenna works on 2.4-2.5GHz and 5.15-5.85GHz in application of IEEE 802.11a/b/g with the dimensions of 2mm × 2.2mm.

並列關鍵字

CPW-fed ； antenna

參考文獻

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