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

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

참고문헌

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