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A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits

버랙터와 다중 슬릿들을 결합한 광대역 주파수 가변 흡수체

  • Cho, Soo-Bean (Department of Electronic Engineering, Sejong University) ;
  • Jo, Eon-Seok (Department of Electronic Engineering, Sejong University) ;
  • Kim, Dongho (Department of Electronic Engineering, Sejong University)
  • 조수빈 (세종대학교 전자공학과) ;
  • 조언석 (세종대학교 전자공학과) ;
  • 김동호 (세종대학교 전자공학과)
  • Received : 2016.01.04
  • Accepted : 2016.02.16
  • Published : 2016.04.30

Abstract

We propose a thin electromagnetic wave absorber using varactor diodes combined with intentionally introduced multiple slits, which enables continuous sweep of an absorption frequency band throughout relatively wide frequencies. The absorption frequency range of conventional electrically tunable absorbers has been restricted by high capacitance of varactor diodes. In order to overcome the problem, we introduce parasitic capacitance and connect them with varactors in series, which reduces the total capacitance dramatically. As a result, we can raise the operating absorption frequency up to the X-band region. Moreover, we can also control the operating frequencies by modifying the number of slits with little change in an entire frequency sweep range. Good agreement between simulated and measured results show the validity of our proposal.

본 논문에서는 버랙터 다이오드와 다중 슬릿을 결합한 광대역 주파수 가변 흡수체를 제안한다. 의도적으로 구성된 폭이 좁은 슬릿에 의한 기생 커패시턴스와 버랙터 다이오드를 직렬 연결하여 도체 표면의 전체 커패시턴스를 효과적으로 낮췄다. 그 결과, 기존의 흡수체에 비해 훨씬 높은 주파수 영역에서도 높은 흡수율을 얻을 수 있을 뿐만 아니라, 슬릿 개수를 조절하여 동작 주파수 대역도 자유롭게 선택할 수 있다. 기생 커패시턴스가 임피던스 매칭에 미치는 영향을 분석했고, 시뮬레이션 결과와 측정 결과가 잘 일치하는 것을 통해 제안된 방법의 타당성을 입증했다.

Keywords

References

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