應用於微波之多頻帶通濾波器之設計;Design of Multi-band Bandpass Filters for Microwave Applications

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题名:	應用於微波之多頻帶通濾波器之設計;Design of Multi-band Bandpass Filters for Microwave Applications
作者:	徐克文;Hsu,Ko-wen
贡献者:	電機工程學系
关键词:	多頻帶通濾波器;步階式阻抗共振器;非對稱式共振器;半集總式共振器;Asymmetrical resonator;multi-band bandpass filter;stepped-impedance resonator;semi-lumped resonator
日期:	2015-01-21
上传时间:	2015-03-16 15:59:04 (UTC+8)
出版者:	國立中央大學
摘要:	對於多頻帶通濾波器之設計，本論文使用以下三種方法實現：(a) 使用雙層基板之設計；(b) 使用非對稱式共振器之設計；(c) 使用半集總式共振器之設計。 (a) 使用雙層結構之多頻帶通濾波器設計在第一部份中，本論文提出一種使用雙層結構之多頻帶通濾波器之設計，探討雙層基板及步階式阻抗共振器之濾波器設計。在雙層基板的使用上，由於可使用的電路佈局面積多了一倍，可比原本的單層基板的使用提供更多的設計空間；在步階式阻抗共振器的使用上，可藉由設計共振器的電子長度比以及阻抗比達到控制高頻諧波的設計。此類設計不但可用於設計多頻帶設計，而且可以達到面積微小化的優點。本論文使用雙層結構設計四頻帶通濾波器，四頻寬止帶帶通濾波器及五頻帶通濾波器。 (b) 使用非對稱式共振器之多頻帶通濾波器設計在第二部份中，本論文使用之非對稱式共振器是由三段均勻阻抗且不同電子長度之微帶線所構成。藉由本文所推算的理論公式，可準確地設計非對稱式共振器之中心頻率及高頻諧波之模態，進而設計達到理想通帶之響應。本論文使用非對稱式共振器設計三頻帶通濾波器以及具寬止帶抑制之三頻帶通濾波器。 (c) 使用半集總式共振器之多頻帶通濾波器設計在第三部份中，本論文提出半集總集式共振器之設計，共振器是由兩段均勻阻抗共振器和一電感元件所構成。和一般的均勻阻抗共振器相較之下，半集總集式共振器可藉由電感值和微帶線的設計，可以達到電路面積微小化和高頻諧波的控制。本論文使用半集總集式共振器設計兩個多頻帶通濾波器，各別是使用分散式耦合之六頻帶通濾波器與具高截止度之六頻帶通濾波器。 ;This dissertation employed three methods to design multi-band bandpass filter: (a) double-layered substrate; (b) asymmetrical resonator and (c) semi-lumped resonator. (a) Double-layered structure In the first section, a double-layered structure was proposed to design the multi-band bandpass filter, and explore the use of double-layered structure and stepped-impedance resonators. In the design of double-layered substrate, the useful circuit layout has twice area than the general single-layered substrate provide more design freedom; in the use of stepped-impedance resonator, the fundamental frequency and harmonics can be controlled by the design of the electrical length ratio and impedance ratio. Such design method not only can provide the multi-band bandpass filter design, but also reduce the use of circuit area. In this study, the double-layer structure was used to design the quad-band bandpass filter, quad-band bandpass filter with wide stopband response and quint-band bandpass filter. (b) Asymmetrical resonator In the second section, the asymmetrical resonator is composed of three microstrip uniform impedance resonator with different electrical length. By using theoretical analysis, projected herein, may be accurately design asymmetrical center of the resonator frequency and mode of high-frequency wave bands, and then design to achieve the desired passband response. In this study, the use of asymmetrical resonator design tri-band-pass filter, and tri-band pass filter with suppression of a wide stopper. (c) semi-lumped resonator In the third section, the semi-lumped resonator was proposed to design multi-band bandpass filter, and it is composed of two microstrip uniform impedance resonator and a lump inductor. Compared with previous general microstrip uniform impedance resonator, the proposed semi-lumped resonator has the characteristic of size reduction and harmonic control by designing the microstrip line and inductance. In this study, the use of the semi-lumped resonator was used to design the distributed sext-band bandpass filter and sharp-rejection sext-band bandpass filter.
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