A Study of Synthesized Transmission Lines on Low-temperature Co-fired Ceramic Process and its Miniaturized Coupler Designs

• Main Authors: Wei-chen Wang, 王尉臣
• Other Authors: None
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/88385019090293542774

碩士 === 國立臺灣科技大學 === 電機工程系 === 100 === 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.