鄭士康臺灣大學：電信工程學研究所劉進豐Liu, Chin-FengChin-FengLiu2007-11-272018-07-052007-11-272018-07-052006http://ntur.lib.ntu.edu.tw//handle/246246/58616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。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.Contents Abstract I 摘要 II Table of Contents III List of Figures V List of Tables VIII 1 Introduction 1 1.1 Motivation for UWB Antenna Design 1.2 Literature Survey for UWB Antenna Design 1.3 Motivation for Dual Band Antenna Design 1.4 Literature Survey for Dual Band Antenna Design 1.5 Chapter Outlines 2 CPW-fed UWB Monopole Antenna 9 2.1 Geometry 2.2 Simulation and Measurement Results 2.3 Parameter Study 3 CPW-fed UWB Monopole Antenna with a Band Notch Characteristic 23 3.1 Geometry 3.2 Numerical and Experimental Results 4 The CPW-fed Hybrid Slot Antenna 33 4.1 Introduction 4.2 Hybrid Slot Dipole Antenna 4.2.1 Geometry 4.2.2 Numerical and Experimental Results 4.2.3 Parameter Study 4.2.4 Design Flow 4.3 Dual Band Slot Antenna 4.3.1 Geometry 4.3.2 Numerical and Experimental Results 5 Conclusions 49 References 501163643 bytesapplication/pdfen-US共面波導天線CPW-fedantennathesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58616/1/ntu-95-R93942074-1.pdf