利用數個多重路徑分支負載共振器之多頻帶多工器;Multiband Multiplexers by Using Multipath Stub-Loaded Resonators

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Title:	利用數個多重路徑分支負載共振器之多頻帶多工器;Multiband Multiplexers by Using Multipath Stub-Loaded Resonators
Authors:	陳冠涵;Chen, Kuan-Han
Contributors:	電機工程學系
Keywords:	多工器;四頻帶通濾波器;四工器;multiplexer;quad-band bandpass filter;quadruplexer
Date:	2017-07-10
Issue Date:	2017-10-27 16:09:29 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文中提出四頻帶雙工器、四頻帶帶通濾波器與八頻帶四工器。多頻多工器使用散佈式耦合饋入技術，使得電路有低負載效應且不需要額外複雜的匹配電路。多重路徑分支負載共振器為本論文設計電路的主軸，每一個多重路徑分支負載共振器會產生兩個操作頻率，操作頻率可以藉由調整共振路徑長度來決定。本文所設計的八頻帶四工器由一條輸入饋入線、四條輸出饋入線、兩組多重路徑分支負載步階式阻抗共振器以及兩組多重路徑分支負載均勻阻抗共振器來實現。利用步階式阻抗與在倍頻時的外部品質因素不匹配的方法來達到推移倍頻與抑制倍頻的產生，實現寬止帶的效果，同時步階式阻抗也有縮小面積的特性。綜合上面所述，此電路具有電路面微小化、頻帶高選擇度與設計的高自由度的特性，此電路面積為0.34λg * 0.19λg，頻帶間的隔離度有32 dB以上的抑制。 ;In this thesis, the quad-channel diplexer, quad-band bandpass filter and octa-channel quadplexer are presented. These three circuits are using distributed coupling technique to achieve low loading effect and can obtain many channels without complicated matching network. The multipath stub loaded resonators is designed to have two resonant path, and the resonant frequencies can be easily controlled by tuning length for each resonant path in the multipath stub loaded resonators. The octa-channel quadplexer is composed of two set of multipath stub loaded stepped impedance resonators(SIR) and two set of multipath stub loaded uniform impedance resonators (UIR)with one long distribute input feeding line and four output feeding line. UIR structures and un-matching Q-factor at harmonic frequency were used to suppress harmonic, through which widestopband was achieved. And meanwhile UIR structures has characteristic of reduce the size of circuit. In short, the filters have advantages of compact size, high passband selectivity and high design freedom. As a result, the proposed octa-channel quadplexer occupies an exceedingly small circuit size, i.e., 0.34λg by 0.19λg, while still having good isolation better than 32 dB for each channel.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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