Design and Synthesis of High-power Low-pass Filters and Broadband Baluns

• Main Authors: Lin, Chung-Chieh, 林忠傑
• Other Authors: Chang, Chi-Yang
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/65093543930161338300

碩士 === 國立交通大學 === 電信工程系所 === 97 === This thesis includes two parts. In the first part, we propose a high-power low-pass filter using all lumped components. According to the specifications of the product, suitable choice of materials and components is the most important issue for high-power consideration. Many useful tips will be introduced to estimate the filter performance and the detailed manufacturing process of this product will also be mentioned. In the second part, based on the exact synthesis method by Richard’s transformation, we present a new novel broadband balun structure, which can extend the conventional fourth-order Marchand balun to the fifth or higher order. For practical fabrication, some types of transmission-line structures can be used to implement the network such as microstrip line (MS), slotline (SL) and coplanar stripline (CPS). Most importantly, we can arbitrarily design the parameters of balun such as impedance transformation ratio, bandwidth and return loss by solving these established mathematical equations.