本論文之研究主旨為探討馬群平衡-不平衡轉換器之補償機制。基於電路佈局需要，馬群轉換器之兩耦合線段間常需一電氣長度不可忽略之連接傳輸線，藉由時域多重反射分析，可發覺該連接線對於輸入端埠之阻抗匹配，及輸出端埠之振幅與相位平衡響應皆有顯著之影 響，明顯破壞馬群轉換器之效能。
有鑑於此，本論文提出馬群平衡-不平衡轉換器之創新補償設計，該補償架構乃控制耦合線段之電氣長度與耦合量，並於耦合線段之短路側引入補償傳輸線，以提升馬群轉換器之工作效能。依循電路實施方式，又可分為左側補償式、右側補償式、與雙側補償式馬群平衡-不平衡轉換器。依據實驗結果，可發覺雙側補償式馬群轉換器具有最寬頻之響應，在連接線電氣長度接近50度之條件下，仍可實現近似於傳統馬群平衡-不平衡轉換器之頻率響應。
本論文之研究成果，可顯著提升馬群平衡-不平衡轉換器之電路佈局自由度。

This thesis is devoted to the study of a new compensation scheme for Marchand baluns. Due to practical layout issues, the Marchand balun usually requires a nonzero connection line in-between the coupling sections. In accordance with the time-domain multi-reflection analysis, this connection line could dramatically deteriorate the input impedance matching as well as the responses at the balanced output ports including the amplitude balance and phase balance.
To tackle this problem, in this thesis a new compensation design for Marchand balun is proposed. This new configuration is accomplished by controlling the amount of coupling and the electrical lengths of the two couple lines. A pair of transmission lines at the short-circuited terminals of the coupled lines is also involved in the compensation scheme.
In the circuit implementation, three alternative balun structures, the left-side, right-side, and double-side compensated Marchand baluns, are implemented and experimentally demonstrated. According to experimental results, the double-side compensated balun features the widest fractional bandwidth, which is comparable to that of a conventional design even if the electrical length of connection line is approximately 50 degrees.
The research in this thesis can significantly improve the performance as well as the design flexibility of the Marchand baluns.

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