| 摘要: | 摘要
本篇論文主要在探究由低通/帶通組合之多頻帶濾波器與多工器之設計。一些新的電路型態已被發展出來使得低通與帶通濾波器可以簡單有效的方式分開設計，並且都有經過實驗的驗證。低通濾波器結合了參數優化及低通轉換的方法，而帶通濾波器則利用典型開迴路環式耦合傳輸線共振器來開發。此外，我們針對階梯式阻抗共振電路(SIR)進行分析。此類共振器不但可以用來縮減電路尺寸，而且具有可以控制其所有寄生振頻率的能力。本論文亦提供了此類共振器的完整設計公式，其中包含其頻率響應的理論預測。實際上，這類共振器是四分之一波長傳輸線階梯式阻抗共振電路的一種延伸。針對此共振器的總電氣長度及頻率響應，亦進行理論分析。總體而言，這些濾波器不但具有極小的面積，而且擁有相當好的止帶頻率響應。
本篇論文主要分成兩大部分：(a) 低通-帶通五工器/三工利用分佈式元件耦合技術之設計與研究；(b) 利用低通-帶通濾波器並接處理方式發展出可彈性配置之五頻帶低通-帶通濾波器的設計與實作。
(a) 低通-帶通多工器利用分佈式元件耦合技術之設計與研究
在第一部份，本篇論文提出兩種低通-帶通多工器之結構，其一為五頻帶低通-帶通五工器設計，另一為五頻道低通-帶通三工器設計。多工器電路由一長分佈式耦合饋入線、一低通濾波器及四個帶通響應濾波器組成。橢圓低通濾波器頻響搭配四個二階柴比雪夫式耦合帶通響應濾波器組合達成所需之特性。此外，由於分佈式耦合技術的低負載效應，無需額外的匹配電路，因此所設計出的多工器相當精簡。為了驗證設計概念，兩種多工器被設計、製造及測試，量測結果與模擬吻合。
(b) 頻帶可彈性配置之五個頻帶低通-帶通響應濾波器設計與製作
在第二部份中，本篇論文提出五個頻帶低通-帶通五工器設計。低通濾波器由一曲折型的傳輸線及修改T型的共振器所組合而成。在低通濾波器架構下，由一對低通濾波器兩端平行延伸的I/O耦合饋入線及一種四頻帶的λ/4感抗式耦合雙模殘段載入步階式傳輸線共振器之帶通濾波器所共同組成之五頻帶低通-帶通響應濾波器。藉由所2導入之平行延伸的I/O耦合饋入線及利用多重耦合路徑，四個頻帶的帶通濾波器可完全被控制及獨立設計。尤其是，兩種不同型態的帶通響應濾波器被探討且組合成四頻帶的頻響。這個設計的背後理念為提供最佳性能的簡潔尺寸。為了驗證設計概念，兩種五頻帶低通-帶通濾波器被設計、製造及測試，其量測結果與模擬吻合。
;Abstract
This research is regarding the design of microstrip LP-BP filters and miniaturized multiplexers. Several newly developing arrangements have been presented with an individual design for lowpss filter(LPF) and bandpass filters (BPFs) responses in an valid plan step, and all of them are authenticated by experimental outcomes. The LPF plan is integrated accompanied by moduli optimization and the LP archetype conversion practice, and the BPFs plan may be expanded utilizing the traditional plan doctrine of open-end ring coupled-resonator filter. In addition, stepped-impedance resonators (SIRs) that are the elementary parts of the suggested filters and multiplexers have been completely researched. The SIR not merely may be utilized to lessen the resonator size moreover efficient of containing all other resonant frequencies. Intact plan formulas for SIRs have been offered, mainly in the projection of their basic and higher-order fake resonant frequencies. These resonators are affiliated to the change of quarter-wavelength transmission line (TL) SIRs. The overall electrical length and resonant frequencies of these resonators accompanied by distinct architecture moduli have else been resolved theoretically. In the end, each of the planned filters holds a extreme small circuit size and has a well stop band response. Furthermore, to design multiband filter and multiplexer, a newfangled plan approach has been suggested. Coupling architectures accompanied by Chebyshev frequency responses is demonstrated to implement multi-band properties.
This dissertation divides into two parts: (a) lowpass-bandpass (LP-BP) multiplexers utilizing distributed coupling technology; (b) quint band lowpass-bandpass (LP-BP) filter with adjustable pass band architecture;
(a) LP-BP multiplexers using distributed coupling technology
In the first part, new newfangled microstrip LP-BP multiplexers using distributed coupling technology is suggested. The multiplexer comprises of a lengthening distributed coupling input feeding wire, output feeding wires, a LP and four passage BPFs. Elliptic LP frequency response and coupling architecture with second pole Chebyshev BP frequency responses are demonstrated to implement desired properties. In addition, due to the low loading result from input distributed coupling technology, no addition matching networks is required. As there are no addition matching networks, the multiplexer is succinct. To validate the design idea, two experimental cases have been planned and manufactured, and tested. The measurement outcomes are in well fit accompanied by the full wave emulation outcomes.
(b) quint band LP-BP filters with adjustable pass band architecture
In the second part, novel suggested microstrip quint band LP-BP filters are demonstrated. The LPF architecture consists a twisty TL and modified T-formed resonators. Based on such a LPF architecture, a quad-band λ/4 inductively-coupled dual-mode stub-loaded stepped impedance resonators (SIRs) BPF with one pair of coupled I/O feeding line are paralleled on both sides of LPF to compose a quint band LP-BP filter. By merging parallel I/O coupled line and utilizing multiple coupling routes, four BP bands can be completely contained and planned individually. Intentionally, two distinct genres of BPFs with distinct producing mechanisms are explored and then integrated to offer the quad band responses. The idea behind this plan is to carry out multiple downsizing technologies on quint band to implment succinct sizes with optimum function. To verify the plan idea, two genres quint band LP-BP filters are planned, manufactured, and checked, where emulation outcomes approve well accompanied by measurement outcomes. |
