臺灣博碩士論文加值系統

濾波器是通訊系統中不可缺少的重要組件，在微波與毫米波頻段的濾波器都是使用分散式元件完成，而由於平面型的傳輸線有易與其他電路組件相接合的優點，所以分散式元件常以微帶線與共面波導來製作。本論文主要針對微帶線與共面波導濾波器加以研究，依據兩者的特性來設計不同頻寬的濾波器。
在微帶線方面，將介紹傳統四分之一波長邊緣耦合帶通濾波器，並且研究改善其通帶外截止特性的方法，最後達成的濾波器設計，其面積與傳統邊緣耦合型濾波器面積相等，但是低頻與高頻的截止特性都變的更好，而且通帶的損失也不會變差。利用這種結構，我們完成了中心頻率在28GHz與38Hz的兩組帶通濾波器設計。
在共面波導方面，將介紹以串接開路、新型並接短路兩種截線交錯所完成的寬頻濾波器，與傳統濾波器不同的是，其並接截線在共面波導的中心線，串接截線在接地面，這種架構比傳統的濾波器少了許多的傍線，可以減少製作成本。
上述的兩種平面型濾波器都有易於製作、結構緊密的特性，所以很適合整合進入通訊系統中。

Filter is an essential component in communication system. It is always implemented by distributed elements at micro- and millimeter- wave frequencies, and distributed elements are usually made by microstrip-line and coplanar-waveguide because of their planar characteristics which make them easy to connect with other circuit components. In this study, various microstrip and coplanar-waveguide filters will be implemented, together with the designs in accordance with their features.
The conventional quarter-wavelength edge-coupled filter will be modified, and the notch performance will also be improved. The area of modified filter is the same compared with the conventional ones, the notch characteristic becomes better at both high and low frequencies, and the insertion loss is also the same. The bandpass filters with center frequencies at 28GHz and 38GHz can be achieved by this structure.
A broadband coplanar-waveguide filter will be proposed based on the novel shunt short stubs and series open stubs. Completely different from the conventional filters, the shunt stubs of proposed filter are located at center main CPW, and the series stubs are located at two ground planes of CPW. The proposed filter has less bound wire compared with the conventional one, so that the cost of fabrication can be reduced.
The two proposed planar filters are both easy to fabricate and compact, they are suitable for communication systems.

第一章 簡介 1
第二章 濾波器設計原理 4
2-1前言 4
2-2集總式濾波器 5
2-3 分散式帶通濾波器 9
第三章 微帶線帶通濾波器 26
3-1三階邊緣耦合型帶通濾波器 27
3-2高頻截止特性的改善 28
3-3低頻截止特性的改善 29
3-4Q頻帶帶通濾波器 31
3-5 結論 31
第四章 共面波導帶通濾波器 48
4-1 共面波導四分之一波長並椄截線 49
4-2共面波導四分之一波長串椄截線 50
4-3 共面波導寬頻帶通濾波器 51
4-4 結論 52
第五章 結論 67
參考文獻 69

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