臺灣博碩士論文加值系統

本研究主要針對共平面波導饋入之螺線槽孔天線、具圓極化特性之寬頻矩形多環路單極天線與具頻帶選擇天線模組作設計及探討，並分析螺線槽孔天線、矩形多環路單極天線及具頻帶選擇天線模組之模擬與實驗的結果。
首先，我們提出一共平面波導饋入之雙線式螺線槽孔天線，利用共平面波導的雙槽孔會產生能量大小相同及相位差180度的磁流特性，來取代傳統雙線式螺線天線或螺線槽孔天線所需的巴倫 (Balun)電路。由天線模擬與量測數據資料中可得，所提出之共平面波導饋入之雙線式螺線槽孔天線不僅可涵蓋目前商用無線通訊系統，包括DCS、PCS、IMT-2000、Bluetooth、WLAN和HIPERLAN等，而且天線的遠場輻射場形圖也較為對稱。另一方面，為了進一步改善共平面波導饋入之雙線式螺線槽孔天線所產生的軸比 (A.R. ; Axial Ratio)頻寬，我們在螺線槽孔天線外部增加一弧形狀槽孔，此法不僅可以增加軸比頻寬，也不會影響螺線槽孔天線尺寸及高頻寬的特性。
再者，提出一具圓極化特性之寬頻矩形多環路單極天線，此天線主要目的是設計具有圓極化輻射波的單極天線。根據模擬與量測結果可知，此一天線不僅具有傳統單極天線的寬頻效果，而且藉由多個矩形環路激發出圓極化輻射波之特性。
最後，我們提出共平面波導架構的濾波器，此濾波器具有DC ~ 2.6 GHz與5 ~ 6 GHz等帶通頻帶，涵蓋了目前常用的無線通訊系統頻段。在共平面波導濾波器架構中，根據微帶線濾波器所轉換成的LC等效電路設計共平面波導濾波器，並藉由彎曲1/4λg的技術，來縮小濾波器尺寸及改善型態因素之特性。之後，將此濾波器整合在共平面波導饋入之螺線槽孔天線上，經由頻率選擇濾波器將大頻寬天線轉變成多頻段特性，並有效抑制系統頻帶外之雜訊，提高系統接收之選擇性。

In this thesis, three antenna topologies for wideband applications are designed and studied, including a coplanar waveguide (CPW)-fed two-arm spiral slot antenna, a circularly polarized broadband rectangular multi-loop monopole antenna and a frequency-selective antenna module. The simulated and measured results of the spiral slot antenna, the rectangular multi-loop monopole antenna and the antenna module are analyzed.
In the first part, novel designs of a CPW-fed two-arm spiral slot antenna are presented. In order to reduce the whole size, the conventional balun circuit is not used in our study. Two out-of-phase magnetic currents excited by two side slots of the CPW transmission line provide the injection source of the two-arm spiral slot antenna. From the measured and simulated results, the CPW-fed two-arm spiral slot antenna not only covers the bandwidths of DCS, PCS, IMT-2000, WLAN, Bluetooth, HIPERLAN, but also has better symmetric patterns of far field. Although the antenna has an ultra-broadband characteristic, it has a narrow bandwidth of axial ratio. A novel technique of placing a like-arc slot at the outside of the CPW-fed two-arm spiral slot antenna has been developed in this study. The work is focused on increasing the bandwidth of axial ratio without sacrificing impedance bandwidth.
Then, the design of a circularly polarized broadband rectangular multi-loop monopole antenna is proposed. The purpose of the presented antenna is to demonstrate the performance of the circular polarization. Details of the proposed rectangular multi-loop monopole antenna are described and the experimental results are presented to show that the antenna has a wide impedance bandwidth and good properties of circular polarization.
Final, the design of the CPW frequency-selective antenna module, composed of a filter and a wideband spiral slot antenna, is proposed. The band-selective filter, which ranges below 2.60 GHz and from 5.0 to 6.0 GHz, covers most of the wireless communication systems. The LC-lumped equivalent circuit of the CPW filter is extracted a CPW band-selective filter. In order to reduce the filter size and improve the shape factor, the quarter wavelength open stubs are used in the form of bended or folded stub structure. The band-selective antenna module can transform the ultra-broadband antenna into the multi-band antenna. so that the received noise can be suppressed and the selectivity of receiver system is increased.

中文摘要 i
Abstract iii
誌謝 v
目錄 vi
圖目錄 viii
表目錄 xiv
第一章 緒論
1.1 研究動機 1
1.2 螺線天線之簡介 7
1.3 單極天線之簡介 12
1.4 濾波器之簡介 15
1.5 章節概述 16
第二章 寬頻圓極化雙線式螺線槽孔天線
2.1 概述 17
2.2 螺線天線理論 20
2.3 共平面波導饋入之雙線式螺線槽孔天線 23
2.4 圓極化雙線式螺線槽孔天線 39
2.5 結論 57
第三章 具圓極化特性之寬頻矩形多環路單極天線
3.1 概述 58
3.2 單極天線原理 60
3.3 矩形多環路單極天線之設計原理 63
3.4 數據與分析 67
3.5 量測結果 78
3.6 結論 89
第四章 具頻帶選擇濾波器之研究與應用
4.1 概述 90
4.2 濾波器原理 91
4.3 頻率選擇濾波器設計原理 95
4.4 共平面波導濾波器分析 97
4.5 結論 112
第五章 未來研究方向 113
參考文獻 116
個人著作 123
作者簡介 125

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