Analysis of the Planar-type Microwave Bandpass Filter with Spurious Suppression

• Main Authors: Huei-Hung Liang, 梁暉鴻
• Other Authors: Ching-Wen Tang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/41186848013818713621

碩士 === 國立中正大學 === 通訊工程研究所 === 93 === In this thesis, the parallel-coupled stacked SIRs are used to design microstrip bandpass filters. Based on resonance characteristics of a SIR, the second resonant frequency can be adjusted by the parameters of its structural. Using the tapped feeding in the input and output ports, the transmission zeros can located in the lower and upper rejection bands. Moreover, embedded open-loop resonators are also proposed to design parallel-coupled stacked SIRs bandpass filters for suppression the first spurious harmonic response. The stopband characteristics of the filter can be further enhanced. Some experimental filters are measured to demonstrate the design, and their responses show a good agreement with the simulation results.