本論文進行以低溫共燒陶瓷(LTCC)實現合成傳輸線之研究，利用準集總元件近似傳統均勻傳輸線的概念，並結合高介電常數及多層板特性之低溫共燒陶瓷製程，提出三款新型合成微型化微波電路。本論文將針對微波電路之設計概念、分析原理、等效集總電路模型、模擬與實測之電路響應作詳細探討。
本論文首先提出低溫共燒陶瓷實現之合成傳輸線，並利用該合成傳輸線設計出兩款分合波器-直交分合波器及180度分合波器，針對兩款微波電路之電氣響應作實測與模擬之差異探討且表列與文獻記載中各項微型化設計之比較。
此外，本論文亦提出一款微型化返波方向耦合器，此設計之互感及互容主要由相互纏繞之螺旋電感及寬面耦合貢獻，與傳統與文獻記載之方向耦合器比較僅占極小之電路面積，針對此返波方向耦合器設計，本論文亦有詳細表列與比較分析。

A study on miniaturized microwave circuit designs is performed in this thesis. In conjunction with the low-temperature co-fired ceramic (LTCC) process, synthesized microwave circuits with size miniaturization are realized by utilizing the quasi-lump element approach to electrically approximate a conventional transmission line. The design concept, analysis principle, equivalent lumped circuit model, and the electric characteristics are discussed in detail.
Using the multilayered synthesized lines on LTCC, we develop two hybrid coupler, a quadrature coupler and a rat-race coupler, in this thesis. The experimental results are analyzed and the discrepancy between the simulation and measurement is explained. A performance summary and comparison table is provided for each miniaturized coupler.
We also propose a miniaturized 3-dB back-wave directional coupler. The required mutual inductance and mutual capacitance are realized by spiral inductors and broadside coupled lines, respectively. It occupies an extremely compact circuit area when compared with the previous ones in the literature. A comparison table to validate its performance over others is also discussed.

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