臺灣博碩士論文加值系統

在本論文中，我們利用低溫共燒陶瓷技術( LTCC )實現小型化濾波器；包括梳型結構的帶通濾波器在2.4GHz和5GHz的無線通訊( WirelessLAN )頻段與2.4GHz的π型低通濾波器。
我們將在論文中提到，如何決定濾波器的原始結構、如何將濾波器原始結構轉為多層架構，與如何利用低溫共燒陶瓷技術實現多層線路架構。另外我們也探討了多層架構所產生的寄生效應與解決、控制的方法；最後並驗證低溫共燒陶瓷技術的縮小化與低損耗的優異性。

The miniaturized filters realized by low temperature co-fired ceramics (LTCC) technology are described in this thesis. The study includes the comb-line band-pass filters in 2.4GHz and 5GHz of WirelessLAN frequency band, and π-section low-pass filter in 2.4GHz.
This thesis describes how to decide the prototype filter’s structures, how to construct the prototype filters to the multi-layer structures, and how to use LTCC technology to realize the multi-layer circuit construction. Additionally, the parasitic effects of filter caused by itself multi-layer structures and mounting environment are explored. How to solve and control these parasitic effects is also investigated. The measured results prove the capability of the LTCC technology to miniaturize the filter and still to keep the filter’s performance.

Abstract (Chinese)……..………………………………………..............……... ........I
Abstract……………….…………….………………………………………...……...II
Acknowledgment...…...……………………………………………………….….....III
Contents……………………………………………………………………………...IV
List of Figures……………………………………………………………………….VI
List of Tables………………………………………………………… ……………...X
Chapter 1 Introduction................................................................................................1
Chapter 2 Theory of Prototype Low-pass Filter………………...………….……...3
2.1 Analysis of Low-pass Prototype Filter by
Image Impedance Method……………………………………………3
2.1.1 Constant-k Filter Section…………..………………………………..3
2.1.2 m-Derived Filter Section…………………………………………….7
2.1.3 Composite Filters…………………………………………………….9
2.2 Characterization of Low-pass Prototype Filter by
Insertion Loss Method…………..……………………………13
2.2.1 Maximally Flat……………………………………………………..14
2.2.2 Equal Ripple………………………………………………………..15
Chapter 3 Theory of Comb-line Band-pass Filter…………………………….…17
3.1 Introduction of the Typical Comb-line Filter……………………………17
3.1.1 Theory of the Typical Comb-line Filter….……………………….19
3.2 Comb-line Band-pass Filter with Cross coupling Capacitor….………...22
3.2.1 Introduction of Comb-line Band-pass Filter with
Cross Coupling Capacitor…………...……………………………..22
3.2.2 Analysis of Comb-line Band-pass Filter with
Cross coupling Capacitor………………………………………..…24
Chapter 4 The Design Rule, Theory and Procedures of LTCC Technology…….27
4.1 Procedure of 3D Filter Development……………………………………..27
Chapter 5 Realization of Comb-line Band-pass Filter by LTCC Technology…..31
5.1 Comb-line Filter with Cross Coupling Capacitor……………….………31
5.2 Comb-line Band-pass Filter in 2.4GHz Frequency Band……..……...…32
5.3 Simulating Comb-line Band-pass Filter Design in the 2.4GHz
Frequency Band by 3D Simulation Software….………………..……….37
5.3.1 The Influence Caused by the Substrate………..…………………..37
5.3.2 The Influence Caused by the Coupling Through the Internal
Buffer Layer Under the Ground Plane of the Chip Element.….42
5.3.3 The Influence Caused by the Capacitive Coupling of the
Microstrip Gap Between I/O Terminals…………………………..45
5.3.4 Formulation and Analysis of the Parasitic Effect Caused
by the I/O Ports…....………………………………………………..49
5.4 Comb-line Band-pass Filter in 5GHz Frequency Band………....……...51
Chapter 6 Design and Realization of LTCC Low-pass Filter…………………....54
6.1 Realization of Low-pass Filter……………….…….……………………..54
6.2 Third Order Low-pass m-Derived Filter……………………..………….59
6.3 Fifth Order Low-pass Filter……………………………….………...……62
Chapter 7 Conclusion……………………………………………………………….67
References…………………………………………………………….......................69

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