Research and Implementation of High Skirt Factor Filter with Microstrip Line

• Main Authors: Ren-Pang Geng, 耿仁鵬
• Other Authors: Sheng-Fuh Chang
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/57071655581224489205

碩士 === 國立中正大學 === 電機工程研究所 === 87 === The high skirt-factor RF filters are studied and implemented with the microstrip line. Two bandpass filters (3.4~4.7GHz & 4.7~6.5GHz) and one lowpass filter (0~3GHz) are analyzed with image impedance theory, Richard''s transform, and Kuroda identities. The filters are implemented with shunt-stub microstrip lines, and the experimental results show the accuracy and ease of use of the design method. Another narrow-band BPF is analyzed with coupled cavity theory and implemented with conventional hairpin, miniaturized hairpin and square-open-loop microstrip structure. The 3% bandwidth centered at 3.5414GHz filter is synthesized with the third-order Chebyshev, 4-pole and 6-pole elliptic response. The simulation and measurement results are compared and the discrepancy between them is discussed.