臺灣博碩士論文加值系統

本研究之主旨，以實際應用為前提，研製兩款負實部特性之非福斯特元件整合於天線之微型化設計。該設計之基礎，乃因非福斯特電路具有負電抗特性，若作為匹配網路，將可打破以往傳統匹配網路所帶來的頻寬限制；而匹配電路之負實部相較於正實部來說，其物理意義可為天線提供能量，將可額外提升天線效能。此電路可透過負阻抗轉換器與電抗負載元件來實現，整體來說，兩款天線設計再加入負阻抗轉換器作為匹配網路之後，皆具有尺寸縮小及頻寬增加之特點。
本論文首先整理現今負阻抗轉換器該領域之已有理論，針對單端負阻抗轉換器進行詳細介紹。首先將介紹倒F天線與單端負阻抗轉換器進行匹配設計，經充分考量其元件真實響應、走線耦合與穩定性等非理想效應，乃將電路與天線整合以完成最終設計。接著為避免引入穩定電阻，透過設計槽孔天線之輸入導納響應，成功提升電路之穩定性，並與負實部之單端負阻抗轉換器進行整合，並驗證負實部電導改善天線效能之能力。
綜上所述，本論文藉由正確的設計流程，成功實現負阻抗轉換器之電路，也透過與天線整合設計，驗證了非福斯特電路確實有小型化且增加天線操作頻寬的效果，並發現負實部與天線整合應用之潛力，更證實了負阻抗轉換器在天線工程應用中的可行性和有效性。

This study focuses on the development of two non-foster miniaturized antennas for practical applications. Two non-foster elements, sourced by negative impedance converters (NICs), were designed and integrated with electrically small antennas to achieve miniaturized non-foster antennas. Benefitting from the negative susceptances characteristic of the non-foster circuits, the operating bandwidth of traditional antenna matching networks is broadened and the performance of antenna can be enhanced.
A design flow for integrating NICs with electrically small antennas is reviewed, summarized, and investigated. The theoretical background of the single-ended NICs is firstly presented. The single-ended NIC is then integrated with a single-ended IFA in the first design. In order to avoid the introduction of the stable resistor, in the second design, a slot antenna is utilized to compensate the negative resistance of the NIC; the antenna performance is hence significantly improved. The full consideration of real component response, stability, and other non-ideal effects of the NICs were carefully investigated during fabricating and measuring antennas. Good agreement between simulated and measured results was obtained. The experimental results show the improvement in the impedance bandwidth and antenna performance. It confirms the feasibility, effectiveness of the non-foster elements and the potential of the integration of negative impedance converters with antenna engineering in practical applications.

摘要 II
Abstract III
誌謝 IV
目錄 VI
圖目錄 VIII
表目錄 X
第一章 緒論 1
1.1 研究動機與目的 1
1.2文獻探討 1
1.3研究貢獻 3
1.4論文組織 4
第二章 單端負阻抗轉換器 5
2.1 前言 5
2.2 單端負阻抗轉換器之架構 5
2.3 負阻抗轉換器整合於天線之原理 10
2.4 結語 12
第三章 單端負阻抗轉換器整合於IFA天線設計 13
3.1 前言 13
3.2 單端負阻抗轉換器整合於IFA天線設計 13
3.2.1 單端負阻抗轉換器整合於IFA天線之設計流程 13
3.2.2 IFA天線之設計 15
3.2.3以傳統匹配電路進行天線微型化 17
3.2.4負實部之單端負阻抗轉換器設計 20
3.2.4以單端負阻抗轉換器匹配電路進行天線微型化 27
3.3 天線與電路整合實測 33
3.4 結語 40
第四章 單端負阻抗轉換器整合於槽孔天線設計 41
4.1 前言 41
4.2 單端負阻抗轉換器整合於槽孔天線設計 41
4.2.1 單端負阻抗轉換器整合於槽孔天線之設計流程 41
4.2.2 負實部之單端負阻抗轉換器之設計 42
4.2.3槽孔天線設計 47
4.2.4天線與電路整合實測 58
4.4 結語 74
第五章 結論 76
5.1總結 76
5.2未來發展 77
參考文獻 78

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