臺灣博碩士論文加值系統

近幾年來，超寬頻技術經過了蓬勃的發展，已經變成了短距離、高速度無線通訊領域很好的選擇。在2002年，美國聯邦通訊委員會(FCC)制定了超寬頻系統的頻帶為3.1 GHz到 10.6 GHz，並規範在商業上的使用。為了要有很寬的頻寬以及很低的功率，超寬頻系統使用的訊號為極短的脈衝波。由於容易出現訊號失真的現象，在設計這種系統的天線時，比設計其他窄頻天線，更具有挑戰性。
在這篇論文中，我們由一種稱為自我互補的結構來設計一個共面波導饋入的領結形開槽天線。由於自我互補結構的特性，天線的阻抗頻寬非常寬，但是此種天線的真正操作頻寬卻被天線的輻射模型在高頻時的失真給限制，因此我們稍微修改了結構來改善此情形。為了避免跟現有的無線區域網路系統頻帶重疊而產生干擾，我們在所設計的天線上增加了一個開槽而產生了有帶拒特性的超寬頻天線。我們展示了包括頻域與時域的結果，並且對此做了一些討論。

Ultra-wideband (UWB) technology has experienced a blooming growth in recent years and becomes an attractive candidate for short-range high-speed indoor data communications. In 2002, the U.S. Federal Communications Commission (FCC) authorized the commercial deployment of UWB technology, and officially allocated the spectrum from 3.1 to 10.6 GHz for unlicensed UWB communication applications. To possess ultra-wide bandwidth and lower power, the UWB system transmits and receives extremely short pulses. It is quite a challenge to design an antenna for the UWB system, because antennas in the UWB system tend to introduce unpleasant signal distortion and degradation.
In this dissertation, we design a novel coplanar waveguide-fed bowtie slot antenna based on the self-complementary structure. Due to the property of self- complementary structure, the antenna possesses very wide impedance bandwidth. However, the actual operating bandwidth is limited by the distortion of radiation patterns as frequency increases. A modification is made to improve the radiation patterns. In order to prevent the unwanted interferences with the incumbent wireless local area network (WLAN), an additional slot is added to reject the overlapping band. Both the frequency and time domain results are shown and discussed.

摘要 …………………………………………………………………i
Abstract ……………………………………………………………..ii
Contents …………………………………………………………….iii
List of Figures……………………………………………………….v
Chapter 1 Introduction ……………………………….…………... 1
1.1 Motivation …………………………..………………….. 1
1.2 Literature Survey …………………..….…………………3
1.3 Chapter Outlines …………………….……………..…….4
Chapter 2 Concepts …………………….……….………………….7
2.1 Self-Complementary Structures …….……………………7
2.2 Coplanar Waveguide …………………..………………….9
2.3 Dimensionless Normalized Antenna Transfer Function….10
Chapter 3 CPW-fed bowtie slot antenna ……………………….….19
3.1 Model of the antenna …………………….……………….20
3.2 Original bowtie slot antenna ……………………….……..21
3.3 Modified bowtie slot antenna ……………………….…….22
3.4 Results of the modified bowtie slot antenna…………….…23
3.5 Summary …………………….…………………………….24
Chapter 4 CPW-fed bowtie slot antenna with band-rejected characteristic
4.1 Configuration…………………….…………………………41
4.2 Results…………………….…………………..……………42
4.3 Parameters study…………………….…..…………………43
4.4 Summary…………………….……………..………………43
Chapter 5 Conclusion…………………….…………..….…………...55
Reference …………………….……………………..….……………..57

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