Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Microstrip Bandpass Filter Using Stepped-Impedance Coupled-Line Hairpin Resonators with Enhanced Stopband Performance

  • Lee, Hye-Min (Department of Electronic Engineering, Sogang University) ;
  • Ha, Jung-Hyun (Department of Electronic Engineering, Sogang University) ;
  • Wang, Xu-Guang (Department of Electronic Engineering, Sogang University) ;
  • Cho, Young-Ho (Department of Electronic Engineering, Sogang University) ;
  • Yun, Sang-Won (Department of Electronic Engineering, Sogang University)
  • Received : 2011.01.05
  • 발행 : 2011.06.30
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초록

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.

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참고문헌

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