由於微波無線通信系統的迅速發展，微帶線式平面陶瓷濾波器因其具有體積小，成本低，易於製造，極佳的響應性能和容易與其他射頻電路整合之優點，因此吸引了許多研究之關注。在諸多已發表的文獻中，雖然特性各有所長，但是多數設計皆有電路布局複雜度較高，較不易調校與控制的缺點。在本論文中，提出數種具有不同功能之新型帶通濾波器，以符合於不同商用頻段之應用需求。首先，我們提出兩種新型之非正交輸出入雙模態濾波器，操作於2.4 GHz，T形輸出入結構被安排在同一水平線上以容易連接其他射頻電路。第二，我們採用鉤式和插入式耦合結構，以較高的空間利用率與較小的面積，串聯三個步階阻抗共振器，實現2.4/5.2 GHz雙頻帶通之濾波特性。第三，我們使用兩個開路矩形環狀共振器和U型輸出入結構，用於設計具有深傳輸零點之2.4/5.2 GHz雙頻帶通濾波器。四分之一波長的開路殘段和溝槽結構，用於加強深兩通帶間之傳輸零點，並且消除第二通帶之漣波效應。第四，運用並聯分布之共振器與相位差法設計法研製雙頻（1.23/2.4 GHz）和四頻（1.23/2.4/3.5/5.2 GHz）帶通濾波器，並使其具有非對稱且容易個別調校之通帶頻寬和極深之傳輸零點。以上設計，皆擁有電路布局複雜度較低，容易製作與調校之優點。在本論文中，選擇1mm厚度之高品質因素氧化鋁陶瓷作為基板，製作各種不同功能之帶通濾波器，並達到減少傳輸損耗與微型化之目的。我們使用HFSS和IE3D兩套電磁模擬軟體來進行參數調校與最佳化，並採用低污染的網板印刷法，製作本論文中所提出之各種帶通濾波器，因為此方法不需要使用氯化亞鐵來蝕刻Duroid或在FR4基板表面的銅金屬，所以能大幅降低對於環境的破壞與衝擊。本論文中所提出的各種帶通濾波器皆是以安捷倫 N5230A網路分析儀進行量測。最後，由模擬與實測之結果顯示，本論文中所提出的各種帶通濾波器，確實可以達到實用化之目的。

As the microwave wireless communication systems growing rapidly, microstrip planar ceramic filters attract many attentions because of the advantages of small size, low cost, easy fabrication, higher performance and easy integration. In this thesis, several kinds of bandpass filters are designed for different operating purposes. First, two kinds of dual-mode bandpass filters are designed for 2.4 GHz wideband with the T-shaped I/O arranging in a straight way for easy integration. Second, the hook-coupling and insert-coupling structures are adopted for series connecting of the stepped-impedance resonator structures, and 2.4/5.2 GHz dual-band filtering properties could be achieved. Third, two open-loop rectangular ring resonators and U-shaped I/O are designed for 2.4/5.2 GHz dual-band bandpass filters with deep transmission zeros. The quarter wavelength stubs and groove structures are used for enhancing deep transmission zeros between two passband and ripples of the second passband, respectively. Fourth, the parallel positioned resonators with phase difference method are used to design the dual-band (1.23/2.4 GHz) and quad-band (1.23/2.4/3.5/5.2 GHz) bandpass filter with asymmetrical bandwidths and transmission zeros. In the thesis, high quality Al2O3 ceramic substrates are used to fabricate different kinds of bandpass filters for pattern minimization and low losses. The electromagnetic simulators, HFSS and IE3D, were used to adjust and optimize the associated parameters. The printing method was used to fabricate the proposed bandpass filters, which did not need using the FeCl3 to etch the Cu plate from the surface of Duroid or the FR4 substrates. The proposed filters are measured by Agilent-N5230A with the SMA connectors welding. Finally, the simulated and measured results of proposed bandpass filters are in good agreement.

Acknowledgement iii
Abstract vi
Content viii
Table Captions xi
Figure Captions xii
Chapter 1 Introduction 1
1.1 Review 1
1.2 Motive 4
Chapter 2 Theory Description 7
2.1 Microstrip Line 7
2.1.1 Microstrip Line Structure 7
2.1.2 Approximation of Quasi-TEM Wave 8
2.1.3 Influence of W/h and Strip Thickness 11
2.2 Filter Theory 12
2.2.1 Butterworth Response 13
2.2.2 Chebyshev Response 14
2.2.3 Elliptic Response 15
2.3 Filter Network Theory 16
2.3.1 Network Analysis 16
2.3.2 Scattering Parameters 18
2.4 Microwave Dielectric Theory 19
Chapter 3 Experiments 23
3.1 Substrate Selection 23
3.2 Design and Fabrication 23
Chapter 4 Compact T-Shape Input/Output Dual-Mode Bandpass Filters 25
4.1 Dual-Mode Resonator 25
4.2 Design of T-Shaped I/O Dual-Mode Bandpass Filter 27
4.3 Minimization of T-Shaped I/O Dual-Mode Bandpass Filter 31
4.4 Comparison of Different Type Dual-Mode BPFs 34
Chapter 5 Cascade Triple-Stage Dual-Band Bandpass Filters 36
5.1 Stepped-Impedance Resonator 36
5.2 Dual-Band BPF Using Hook-Coupling Structure 38
5.3 Dual-Band BPF Using Insert-Coupling Structure 41
5.4 Comparison of BPFs Using Different Coupling Structure 44
Chapter 6 Compact Dual-Band Bandpass Filter Using U-Shaped Coupling Structure 46
6.1 U-Shaped Coupling Structure 46
6.2 Dual-Band BPF Using U-Shaped Coupling Structure 47
Chapter 7 Quad-Band Bandpass Filter Using Two Parallel Positioned Resonators 55
7.1 Phase Difference Method 55
7.2 Dual-Band BPF Using Phase Difference Method 56
7.3 Quad-Band BPF Using Phase Difference Method 59
Chapter 8 Conclusion 66
References 70

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