Bandpass filter with steep-skirt behavior constructed by double open-loop microstrip resonators

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  • ダブルオープンループマイクロストリップ共振器で構成された急峻なスカート特性を持つ帯域通過フィルタ
  • ダブル オープン ループ マイクロ ストリップ キョウシンキ デ コウセイ サレタ キュウシュンナ スカート トクセイ オ モツ タイイキ ツウカ フィルタ

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Abstract

This paper proposes microstrip bandpass filters consisting of a half-wavelength resonator and quarter-wavelength stubs set at the center of the resonator. The proposed filter easily and compactly produces the bandpass characteristic due to the dual-mode operation and also steep-skirt stopband behavior having attenuation poles in both outside regions of the passband. Furthermore this filter structure can have dual-passband behavior by adding open stubs. Usefulness of the proposed filters is also verified from measuring transmission characteristics of the fabricated ones.

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