本篇論文提出一個利用串接互補式傳輸線結構(complementary transmission-line structure)實現一個寬頻色散式群延遲線，且其|S21|為全通響應。互補式結構主要為訊號層之並聯開路殘段與其相同結構之接地層槽線所構成，其接地層槽線可補償訊號層並聯殘段所產生之零點以使訊號層並聯殘段之|S21|頻率響應由帶拒響應變成全通響應。再者，為了避免高階諧波頻率影響操作頻帶，z域技術亦被引入以提高並聯殘段之諧波頻率與中心頻率之比值，並藉由其所推導的公式設計合適阻抗以控制群延遲之頻寬。多級串接技術亦被運用以增加其群延遲時間與頻寬。

In this thesis, a broadband dispersive group delay line with |S21| of all-pass response using cascaded complementary-transmission-line structure is presented. The complementary structure includes mainly shunted open stubs in signal plane and slot-line of the corresponding stubs in ground plane. Transmission zeros of shunted open stubs can be convert to a all-pass response of |S21| by the slot-line of corresponding stubs. In addition, in order to avoid higher order harmonics affect performance in fundamental band, z domain technique is employed to enhance the ratio of higher order harmonic frequencies and central frequency for the shunted open stubs. The formulations for controlling bandwidth of group delay is also derived by z domain technique. Multi-stage cascaded technique is employed to increase the time and bandwidth of group delay.

論文摘要 I
Abstract II
誌謝 IV
Contents V
List of Figures VII
List of Tables X
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Proposal 2
1.3 Organization of Chapters 3
Chapter 2 Basic Theory 4
2.1 Microstrip lines 5
2.2 Chain-scattering parameters 7
2.3 An open-circuited one-section stub 13
2.3.3 Fundamental circuits and their chain-scattering parameters 9
2.3.1 A serial transmission line section 10
2.3.2 A short-circuited two-section stub 15
2.3.4 An open-circuited two-section stub 16
2.4 Equal length two-section stub in the z domain 19
2.5 Parallel equal-length two-section stubs in the z domain 22
Chapter 3 Implementation and Experimental Results 24
3.1 The design-flow diagram of a broadband dispersive group delay line 26
3.2 A Broadband Dispersive Group Delay Line 28
3.3 Simulated and measured results 43
3.4 Discussion 46
Chapter 4 Conclusion 48
4.1 Conclusion 48
4.2 Future Work 49
References 50

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