本論文研究並實現應用於無線系統之微型化帶通濾波器設計。根據所欲實現之設計規格，選擇適當的反射零點和傳輸零點來做為集總濾波器原型的合成目標。所提出的方法可推導出簡潔的方程式組用來合成給定之濾波器規格，包括通帶的插入與折返損耗以及禁帶的衰減量。所提出的帶通濾波器原型擁有兩個迴授路徑，能提供可控制之多個傳輸零點座落於期望的禁帶頻率上，並可用來加強禁帶之寬頻拒絕能力。傳統微帶線帶通濾波器雖然具有高性能但所佔面積過大而不易整合於無線系統當中，本論文提出在低溫共燒陶瓷基板內實現微型化之單頻與多頻集總式帶通濾波器，在每個通頻兩側皆有可控制的傳輸零點來提高濾波器之選擇度，其性能與面積皆可與內埋被動元件基板形式之帶通濾波器相較量。本論文中所實現之各種帶通濾波器設計，其電磁模擬結果與實際量測數據皆有高度吻合。

In this dissertation, miniaturized bandpass filters for wireless system applications are analyzed and implemented. The lumped-element filter prototypes are synthesized by selecting the proper reflection and transmission zeros of the bandpass filter. Moreover, the proposed synthetic design approach can be reduced to compact formulas for filters that satisfy the given specifications including passband insertion loss, passband return loss and stopband attenuation. The proposed bandpass filter prototypes have two feedback paths that provide controllable multiple transmission zeros at the desired stopband frequencies and superior wide stopband rejection. Despite their strong performance, most conventional microstrip bandpass filters require a large area, and so are difficult to use in wireless systems. In this dissertation, lumped elements were developed using a low temperature co-fired ceramic (LTCC) substrate to realize miniaturized single- and multi-band bandpass filters. Controllable transmission zeros that are created on both sides of each passband provide an enhanced selectivity for the LTCC filters. The designed electrical performance and size are comparable to those of organic embedded passive substrate (EPS) bandpass filters. The measurement results are consistent with electromagnetic (EM) simulation results for all of the proposed bandpass filter designs.

1 Introduction 1
1.1 Research Motivation 1
1.2 Overview of Dissertation 3
2 Research of LTCC Technology and Bandpass Filters Design Architecture 5
2.1 LTCC Technology 5
2.1.1 Overview of LTCC Technology 5
2.1.2 LTCC Material System and Processing 9
2.2 Research of LTCC Bandpass Filters Design Architecture 11
3 Fast Synthetic Design Approach to Miniaturized Bandpass Filters 15
3.1 Bandpass Filter Design 15
3.1.1 Bandpass Filter using second-order inductive-coupled resonator 16
3.1.2 Bandpass Filter using second-order capacitive-coupled resonator 24
3.2 Filter Implementation and Measured Results 30
3.2.1 Bandpass Filter using second-order inductive-coupled resonator 30
3.2.2 Bandpass Filter using second-order capacitive-coupled resonator 35
4 Synthesis of Miniaturized Dual-band Bandpass Filter 40
4.1 Second-order Bandpass Filter Synthesis 40
4.2 Bandpass Filter Architecture and Synthesis 45
4.3 Dual-band Bandpass Filter Design 48
4.4 Filter Implementation and Measured Results 54
5 Conclusions 60
Bibliography 62
Vita 72

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