한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

  • 제26권11호
  • /
  • Pages.966-977
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  • 2015
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  • 1226-3133(pISSN)
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  • 2288-226X(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
권호 표지
DOI QR코드

DOI QR Code

품질계수가 향상된 변형된 동축 공동 공진기를 이용한 다단 Quadruplet 대역통과 여파기

Compact Cascaded Quadruplet Bandpass Filter Using Modified Coaxial Cavity Resonator with Q-Factor Improvement

  • 장건호 ((주)케이엠더블유 통신연구소) ;
  • 왕욱광 ((주)케이엠더블유 통신연구소) ;
  • 이보람 ((주)케이엠더블유 통신연구소) ;
  • 박남신 ((주)케이엠더블유 통신연구소)
  • 투고 : 2015.07.07
  • 심사 : 2015.11.19
  • 발행 : 2015.11.30
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 새로운 변형된 동축 공동 공진기를 제안하고, 대역통과 여파기를 설계한다. 제안된 공진기는 하나의 캐비티 내부에 ${\Gamma}$-형 또는 곡선형의 4개의 접지된 도체 포스트로 구성되어 있다. 일반 동축 공동 공진기 여파기와 달리 도체 벽이 없기 때문에 공간 효율이 개선되어 품질계수가 약 15 % 이상 향상되며, 동일한 품질계수 대비 35 % 이상의 크기 소형화가 가능하다. 또한, 인접하지 않은 공진기와 입출력 교차결합을 통해 4개의 조절 가능한 전송영점이 생성되어 차단대역의 감쇄특성을 향상시킬 수 있다. 제안된 여파기와 설계법은 모의실험과 제작 및 측정을 통해 검증되었다.

This paper presents a novel modified coaxial cavity resonator and its application to bandpass filters with compact size and improved quality factor(Q-factor). The proposed resonator is made up of ${\Gamma}-shape$ or curved four inner conductive posts within a single cavity, which provides quadruplet to realize bandpass filter. No metallic walls inside the cavity are required, and thus the utilization efficiency of the cavity space is improved. As a result, the unloaded Q can be approximately 15 % higher in comparison to the conventional coaxial resonator, or more than 35 % volume saving can be achieved while maintaining the similar Q-factor value with the conventional designs. In addition, due to the multiple cross-coupling occurring within the cavity, including the source-to-load coupling, four flexible transmission zeros can be created to realize different filtering functions. Simulations as well as experimental results of four- and eight-pole filters are presented to validate this attractive design concept. Good agreement between measured and computed results is obtained.

키워드

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