臺灣博碩士論文加值系統

本論文是對平面式單極天線做一系列的設計與研究，將頻段分為「寬頻」及「雙頻」之兩大研究主軸加以探討。在寬頻天線設計上首先是以平面式單極天線為設計基礎，且利用橢圓形平面結構來產生多種共振模態的特性進而達到寬頻的效果，最大頻寬範圍在返回損失(Return loss)大於10dB時為1.8 GHz到6 GHz以上，進而利用橢圓形平面結構挖入凹槽的方式增加天線縮小的比例，達到改善天線輻射場型及成本降低的目的；在多頻天線設計方面採用共面波導單極饋入方式來取代傳統式單極微帶饋入方式來產生「雙頻」之效果使頻段點範圍座落於2.45GHz與5.2GHz附近。
本論文除了在天線設計上能滿足無線通訊系統的頻寬規定之外並於輻射場型及天線增益部分的特性上亦具有良好的性能表現。

In this paper, the series of designs and studies for planar monopole antenna are presented. I’ll illustrate the subjects of a broadband domain and a dual-band domain separately. It is the disc monopole antenna that we design the base of broadband. For the feature of elliptical disc product more kinds resonant modes, we can up to the effect of broadband. The yielded maximum band- width for return loss > 10 dB is between 1.8 GHz to 6 GHz. We modify the structure of elliptical disc which add the slot to reduce the size of the antenna. In that way, we can improve the antenna radiation pattern and decline cost; in the dual-band designs, we adopt the CPW-fed to replace the microstrip-fed. Therefore, taking the CPW-fed product the effect of dual-band, we make range of frequency band between 2.45 GHz and 5.2 GHz.
The performance we have achieved in these antenna designs not only satisfy the wireless communication application of the system, but also show good antenna pattern and gain.

目 次
摘 要 i
Abstract ii
致 謝 ii
目 次 iv
表 目 錄 v
圖 目 錄 vi
第一章 前言 1
1.1 簡介 1
1.2 論文內容 2
第二章 寬頻段平面式橢圓形單極天線設計 3
2.1 寬頻天線概述 3
2.2 天線設計 8
2.2.1 橢圓形平面結構 8
2.2.2 天線起始頻率與基底面積之修正 10
2.3 實驗結果討論 15
第三章 寬頻段之修改式橢圓平面單極天線設計 23
3.1 概述 23
3.2 天線設計 24
2.4 實驗結果討論 26
第四章 雙頻段之共平面波導式單極天線設計 37
4.1 概述 37
4.2 天線設計 38
4.2.1 雙頻天線簡介 38
4.2.2 共面波導饋入結構 39
4.3 實驗結果討論 42
第五章 結 論 58
參考文獻 59

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