Planar Transmission Line to Waveguide Transition Design and Cavity Modes Analysis in Hermetic Housing

• Main Authors: Wen-Hua Tu, 涂文化
• Other Authors: Ruey-Beei Wu
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/99787228761836745426

碩士 === 國立臺灣大學 === 電信工程學研究所 === 89 === Abstract Due to low loss and high-power handling characteristics, metallic waveguides are still essential components in communication systems. Since planar transmission lines (such as microstrip lines and coplanar waveguides) are compact and easy to integrate with active devices (such as diodes and transistors), they are popular in solid-state microwave circuit design. Efficient transitions between waveguides and transmission lines are essential components in communication systems. Ka-band transitions between microstrip line and waveguide are designed, simulated and measured. Good agreement between simulation and measurement is achieved. Two structures have been tried for the coplanar waveguide to waveguide transition design: one utilizing CPW-fed slot dipole endfire array and the other utilizing CPW-fed capacitive slot antenna. The former can’t achieve good transition since the finite-ground effects would significantly distort the far field radiation pattern of CPW-fed slot dipole endfire array. Simulation results show that the second design can achieve good transition. For a wider frequency band transition, the folded multiple-slot antenna can be employed. Besides, hermetic package of RF front-end module would cause an undesired phenomenon of cavity mode. Simulation and suppression of such cavity modes will also be addressed in this thesis.