頻寬可調式環型阻抗轉換器設計

傳統的阻抗轉換器為四分之波長阻抗轉換器，其提供了一個便捷的阻抗轉換設計方法，但其長度相對較長，於電路板佈局時減少了設計彈性，特別是在頻率較低時。因此，本論文提出一個利用相位差異達成的環型阻抗轉換器。其縱向長度小於四分之波長，可增加電路佈局的彈性，並且進一步研究此設計之頻寬可調特性。本論文分作兩部分，第一部分首先分析雙傳輸線設計阻抗轉換器的理論，接著提出環型阻抗轉換器之設計，由於設計過程中發現必須掌握T型連接、截角彎的設計法則，才能將阻抗轉換效果最佳化，因此針對所需的微帶線連接補償結構進行研究。最後將設計完成的電路，配合TRL為基礎之量測方法，進行單端結構之響應分析，並且驗證其提高選擇性的能力。第二部分則提出矩型雙傳輸線阻抗轉換器，並以此佈局型式設計四個組合討論頻寬可調性質，實作量測則分作兩步，第一步製作四組背對背結構進行雙端50Ω量測，第二步則選擇其中一組進行TRL為基礎之量測方法，展現雙傳輸線結構提高選擇性的能力。

關鍵字

阻抗轉換器；頻寬可調

並列摘要

This thesis is divided into two parts. The first part is analysis of ring impedance transformer design theory, and we propose a design of ring impedance transformer. As found in the design process, we must have the rules about mitered T-junction and right-angle bending. These will minimize the effect of discontinuities by directly compensating the discontinuities. Finally, the circuit design is completed to meet the TRL-based measurement technique for response analysis, and we can prove that the design possesses high signal-selectivity. The second part is about rectangular impedance transformers, and we propose four impedance transformers and use rectangular type of circuits layout to discuss the bandwidth-variable property. The measured, there were two methods, first method is making the structure of four Back-to-Back constructions kits measurements, the other is that we measure one of the four pairs of dual-transmission line impedance transformers by TRL-based measurement technique.

並列關鍵字

Impedance Transformer ； Variable-Bandwidth

參考文獻

[13] 蔡明昌，探討微帶線阻抗轉換器之量測方法，碩士論文，國立台北科技大學，台北，2009。

[1] R. E. Collin, “Theory and Design of Wide-Band Multisection Quarter-Wave Transformers,” Proc. of the IRE, vol. 43, no. 2, pp. 179-185, 1955.

[2] E. J. Wilkinson, “An N-Way Hybrid Power Divider,” IRE Trans. Microwave Theory Tech., vol. 8, no. 1, Jan. 1960.

[4] Y. L. Chow and K. L. Wan, “A Transformer of One-Third Wavelength in Two Sections - For a Frequency and Its First Harmonic,” IEEE Microw. and Wireless Compon. Letters, vol. 12, no. 1, pp. 22-23, Jan. 2002.

[5] C. Monzon, “A Small Dual-Frequency Transformer in Two Sections,” IEEE Trans. Microwave Theory Tech., vol. 51, no. 4, pp. 1157-1161, Apr. 2003.

國際替代計量

頻寬可調式環型阻抗轉換器設計

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