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J Electromagn Eng Sci > Volume 11(2); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(2):91-96.
DOI: https://doi.org/10.5515/JKIEES.2011.11.2.090   
Microstrip Bandpass Filter Using Stepped-Impedance Coupled-Line Hairpin Resonators with Enhanced Stopband Performance
Hye-Min Lee, Jung-Hyun Ha, Xu-Guang Wang, Young-Ho Cho, Sang-Won Yun
Department of Electronic Engineering, Sogang University
Abstract
In this paper, we propose a microstrip bandpass filter using stepped-impedance coupled-line hairpin resonators. The stepped-impedance coupled-line hairpin resonator has extended harmonic suppression in comparison with a conventional hairpin resonator due to transmission zero and the movement of harmonic frequencies resulting from the stepped-impedance characteristic. A high-pass type impedance/admittance inverter is employed in order to improve the lower frequency skirt characteristics of the passband. A 4-pole bandpass filter is designed and fabricated at 1.8 GHz. The measured results show the excellent attenuation performance at the stopband which is greater than 30 dB up to 10 GHz.
Key words: Coupled-Line, Enhanced Stopband Performance, Lumped-Element Circuit, Microstrip Bandpass Filter, Stepped-Impedance Hairpin Resonator

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