Compact microstrip bandpass filters with good selectivity and stopband rejection

Pu Hua Deng, Yo Shen Lin, Chi Hsueh Wang, Chun Hsiung Chen

研究成果: 雜誌貢獻期刊論文同行評審

32 引文 斯高帕斯(Scopus)

摘要

Compact microstrip bandpass filters (second- and fourth-order) are proposed based on the folded quarter-wave-length (λ/4) resonators, which are mainly coupled through the shunt inductors connected to the ground. By introducing a cross-coupling capacitance directly between the input and output ports of the second-order filter, a pair of transmission zeros may be created to improve the selectivity. Moreover, by an extension of the proposed second-order filter with the incorporation of an additional cross-coupling capacitance, a fourth-order filter is also proposed in which two pairs of transmission zeros may be created to improve both the selectivity and stopband rejection. The proposed fourth-order filter also has the merits of small circuit area and no spurious response up to 3 f0, where f 0 is the passband center frequency. To provide effective design tools, simple equivalent-circuit models are also established.

原文???core.languages.en_GB???
頁(從 - 到)533-538
頁數6
期刊IEEE Transactions on Microwave Theory and Techniques
54
發行號2
DOIs
出版狀態已出版 - 2月 2006

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