• 제목/요약/키워드: Frequency Selective Absorber

검색결과 3건 처리시간 0.019초

버랙터와 다중 슬릿들을 결합한 광대역 주파수 가변 흡수체 (A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits)

  • 조수빈;조언석;김동호
    • 한국전자파학회논문지
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    • 제27권4호
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    • pp.399-402
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    • 2016
  • 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.

Ultra-thin Polarization Independent Absorber Using Hexagonal Interdigital Metamaterial

  • Lee, Joung-Young;Yoon, Young-Joong;Lim, Sung-Joon
    • ETRI Journal
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    • 제34권1호
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    • pp.126-129
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    • 2012
  • An ultra-thin hexagonal microwave metamaterial absorber is described. It can absorb any polarized transverse electromagnetic wave because of its hexagonal shape. In spite of its very thin structure, almost $0.028{\lambda}g$, the absorber achieved 99% absorptivity at 11.35 GHz in experimental results because of the increased coupling losses, showing good agreement with simulation results. In addition, this high absorbance is unchanged for any polarized waves with the same frequency.

Ultrathin Metamaterial for Polarization Independent Perfect Absorption and Band-pass Filter

  • Zhang, Xu;Gong, Zhijie
    • Journal of the Optical Society of Korea
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    • 제19권6호
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    • pp.665-672
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    • 2015
  • We demonstrate an ultrathin metamaterial for polarization independent perfect absorption as well as a band-pass filter (BPF) which works at a higher frequency band compared to the perfect absorption band. The planar metamaterial is comprised of three layers, symmetric split ring resonators (SSRRs) at the front and structured ground plane (SGP) at the back separated by a dielectric layer. The perfect metamaterial absorber (MA) can realize near 100% absorption due to high electromagnetic losses from the electric and/or magnetic resonances within a certain frequency band. The thickness of the structure is only 1/28 of the maximum absorption wavelength.