Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Modified Compact Combline Filter Using Planar Parallel Coupled Structure with Extended Rejection Bandwidth

  • Kang, In-Ho (Dept. of Radio Engineering Korea Maritime University) ;
  • Wang, Kai (Dept. of Radio Engineering Korea Maritime University) ;
  • Li, Shang MIng (Dept. of Radio Engineering Korea Maritime University)
  • Received : 2010.03.31
  • Accepted : 2010.08.30
  • Published : 2010.09.30
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Abstract

Modified compact combline bandpass filters are proposed based on the miniaturized quarter-wave transmission line which is composed of the parallel coupled line and lumped capacitors. The electrical length of the parallel coupled line in a resonator, which determines the size of combline bandpass filters, is just $5^{\circ}$ or $7^{\circ}$, resulting in a compact circuit area. The designed combline bandpass filter also has a wide upper stopband by suppressing the spurious passbands, not moving. Measured results of two fabricated filters centered at 400MHz show good agreement with the theoretical predications.

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References

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