臺灣博碩士論文加值系統

微帶線式印刷陶瓷濾波器因其擁有體積小、便宜、容易製作、響應特性佳與多頻之特點，所以已被廣泛地應用在許多微波通訊系統上。在本研究中，採用高品質因素之氧化鋁陶瓷材料為基板，以獲取上述之優點。
本研究所提出之兩種帶通濾波器(環形、間隙耦合形)，皆是以基頻共振於2.4GHz，如此一來，即可用於IEEE-802.11b/g/n無線傳輸頻段。如同本文結果所示，濾波器之形狀與共振電流路徑對其共振頻率、插入損失與旁波瓣深度擁有非常大之影響。本文所提出的濾波器，為了擁有較佳的訊號鑑別度，皆是將50Ω匹配之輸入與輸出端以耦合的方式連接於共振器前後兩端。為了降低實驗成本並獲得所需的濾波器特性，我們先以IE3D電磁模擬軟體進行設計與調校各種不同圖形參數，之後再以網板印刷的方式製作完成，並將SMA焊接於其上，再以安捷倫-8722型網路分析儀量測其特性。經由量測之結果顯示，本文所提出之2.4GHz印刷陶瓷帶通濾波器與先前模擬之結果趨勢相當接近。

RF and microwave bandpass filters are presently required in wide applications of wireless communication systems. Microstrip printed ceramic filters are being widely used in microwave communication systems, because they have excellent characteristics of small size, low cost, easy fabrication, higher performance and multi-frequencies. In this research, high quality ceramic are used as the substrate to fabricate modified dual-frequencies band pass filters in order to have that advantages.
This thesis mainly study dual-mode filter for the application of wireless communication. Parametric study on the characteristics of dual-mode bandpass filter is presented. The dual-mode resonator, the flowing path of current, and different slot shape in structure of filter are also studied.
In addition, the designed filters are all printed on the dielectric substrate directly and can be easily integrated with RF (Radio Frequency) circuit. The high permittivity materials ( ceramic materials) make dual-mode bandpass filter have good characteristics and small size. All the filters in this thesis are designed to be compact, including changed slot filters. The effects of these different filters are studied and discussed.

Contents
I. Introduction 1
II. Theory Description 5
2.1 Microwave Theory 5
2.1.1 Material Requirement 5
2.1.2 Microwave Dielectric Properties 7
2.1.3 Network Analysis 12
2.1.4 Scattering Parameters 14
2.1.5 Shot-Circuit Admittance Parameters 16
2.1.6 Open-Circuit Admittance Parameters 16
2.1.7 ABCD Parameters 17
2.2 Transmission Lines 18
2.2.1 Microstrip Lines 18
2.2.2 Microstrip Losses 21
2.3 Filters Theory 23
2.3.1 General Definitions 24
2.3.2 Butterworth Response 26
2.3.3 Chebyshev Response 27
2.3.4 Elliptic Response 28
2.3.5 Gaussian Response 29
III. An Investigation of Bandpass Filter using Dual-Mode resonator 32
3.1 Foreword 32
3.2 Fabricative Process 33
3.3 Dual- Mode resonator 35
3.4 Design and Experiment 39
IV. Miniaturized Hairpin Bandpass Filter 49
4.1 Introduction 49
4.2 Design Theory 50
4.3 A New type of Hairpin Bandpass Filter 52
4.4 Simulated and Measured Resulted 54
4.4.1 Length and width 54
4.4.2 Stepped-Impedance gap 57
4.4.3 Microstrip Line Gap 58
4.4.4 Resulted 60
4.5 Conclusion 63
V. Conclusion 65
IV. Reference 67

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