Design and improvement of microwave amplifier and coupler

• Main Author: 周官緯
• Other Authors: 王秀仁
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/03289607981448359273

碩士 === 國立臺灣科技大學 === 電子工程系 === 92 === 　　　In this thesis，a 2.4GHz microwave amplifier and a new microstrip directional coupler line, wiggly-coupled, is performed．The transistor of Philips BFG425W is used to be the major element of the microwave amplifier. The FR4 substrate（ =4.4， h=1.5mm， tanδ=0.02， t=0.03mm） is used. We will show the detail result of design, simulation, and measurement. The wiggly-coupled line is composed of squarely wiggled parallel lines． The different capacitance between the even mode and odd mode make phase velocity different．The wiggly line compensates the phase velocity difference between the even mode and odd mode such that the isolation Of the couple line can be improved．The impacts of replacement，rotation and the reflection of the wiggly wiggly-coupled line are also discussed. The circuit theory, software simulation, layout, measurement, and testing of the circuits are described.