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J Electromagn Eng Sci > Volume 7(4); 2007 > Article
Journal of the Korean Institute of Electromagnetic and Science 2007;7(4):190-194.
DOI: https://doi.org/10.5515/JKIEES.2007.7.4.190   
Cross-Coupled Microstrip Combline Bandpass Filter Using Stepped-Impedance Resonators
Young-Ho Cho, Seung-Un Choi, Sang-Won Yun
Dept. of Electronic Engineering, Sogang University
In this paper, a cross-coupled microstrip combline bandpass filter using stepped-impedance resonators(SIRs) is proposed. In order to improve the selectivity as well as the insertion loss, the SIR configuration is used. The cross coupling is also introduced to enhance the selectivity. The improvement of the insertion loss is demonstrated not only by deriving the quality factor of the SIR but through the measured performances. Both the proposed and the conventional combline bandpass filter with 5 % of fractional bandwidth at 2 GHz were fabricated and tested. Compared to the conventional combline bandpass filter, the proposed one exhibits the improved selectivity as well as the lower insertion loss characteristics.
Key words: Combline Filter, Stepped-Impedance Resonator, Cross Coupling, Microstrip


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