臺灣博碩士論文加值系統

現今手持行動裝置所使用眾多天線當中，以平面微帶天線具有體積小、重量輕、製作容易、價格低廉、可信度高、結構簡單，容易與印刷電路結合等優點，尤其在手機通訊應用上扮演著重要的角色。

緣此，本論文利用全平面正方形單極微帶天線及倒Ｆ天線架構當作設計天線的原型。提出多種不同架構的多頻帶微小化倒Ｆ天線。首先分別採用矩形繞線方式及圓形繞線方式改變原有倒Ｆ天線架構，引入適當之電感性進入原有天線結構，兩者皆可縮小天線尺寸並產生所需之雙頻效果。進一步探討製造過程影響到相關尺寸及基本參數變異時對於天線特性之影響。並且討論加入晶片電阻於結構中對於改善操作頻寬的影響。最後並探討將此改良微小化倒Ｆ天線另加入一額外的殘段，使其由雙頻操作改變為三頻操作的方法。實作結果顯示，所作之結構改良皆可以輕易設計在所需要的頻段，比起傳統倒Ｆ型天線所佔面積也可大幅縮小，且其場型也具有全向性場型的特質。


關鍵詞：微帶天線、倒Ｆ天線、手機通訊、全向性場型

Among the most common used antennas in the portable mobile devices, the planer micro-stripe antenna is the most popular one of which is small size, light in weight, easy fabrication, low cost and high reliability and especially its easy compatibility with printed circuit board. So it plays an important role in handset communication.

In this thesis, one of rectangular monopole micro-stripe antenna was used as the basis for study. Three inverted F-shaped antenna (PIFA) structures were studied for the minimization of multiple-band applications. First, both approaches of rectangular and circular spiral deformed structures were employed to minimize the antenna size and generate a dual pass-band antenna. The variations of feature size and material parameters suffered from the manufacture of the printed circuit board were investigated, too. The possibility of enlarging the operating bandwidth on the PIFA antenna was evaluated by adding one chip resistor in serial. Finally, an extra stub was appended onto the deformed rectangular spiral PIFA antenna. By this way, the flexibility of operating frequency could be easily expanded from dual bands to triple bands. All of the structures had been verified with measurement. The experimental results reveal that the desired operating frequency could be easily achieved. As compared to the traditional planar inverted F-shape antenna, such kind of deformed ones take less area on the printed circuit board. One of important figure is their radiation field pattern being omni-directional.

Keywords: micro-strip antenna, PIFA, handset communication, omni-directional

Figure Captions VIII
Table Captions XI
Abstract (in Chinese) XIII
Abstract (in English) XV

l Chapter 1 Introduction and overview 1
1.1 Introduction 1
1.2 Objectives 3
1.3 Thesis Overview 4

l Chapter 2 Basic antenna theory 5
2.1 Microstrip antenna 5
2.1.1 Introduction 5
2.1.2 Microstrip antenna theory 7
2.2 Dipole antenna 15
2.3 Monopole antenna 18
2.4 Image theory 20
2.5 Resonance definition 21

l Chapter 3 Planar inverted-F antenna 23
3.1 Evolution of PIFA antenna 22
3.2 The theory of a.planar inverted-F antenna. 25

l Chapter 4 Simulation, measurement and analysis 27
4.1 Patch antenna 28
4.2 Dual-band F-shaped Antenna 34
4.3 Dual-band miniaturized F-shaped antenna 38
4.4 Dual-band PIFA antenna 40
4.4.1 Influence with the variation of the PCB substrate thickness 49
4.4.2 Influence with the variation of the PCB copper thickness 51
4.4.3 Influence with the variation of the relative dielectric constant 52
4.4.4 Influence with the variation of the spiral trace width (S2) 53
4.4.5 Influence with the variation of the spiral gap width (S3) 54
4.4.6 Influence with the variation of .the gap between spiral trace and ground (S4) 55
4.4.7 Influence with the variation of the ground plane width (W2) 56
4.5 Dual-band deformed PIFA antenna 57
4.6 Circular spiral dual-band PIFA antenna 59
4.7 Bandwidth widening with chip resistor in a deformed dual=band PIFA antenna 60
4.8 Triple-band rectangular PIFA antenna 66
4.9 Summary 70

l Chapter 5 Conclusions 71

l References 73

l Acknowledgements 76

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