항공우주시스템공학회지 (Journal of Aerospace System Engineering)

  • 제17권1호
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  • Pages.42-50
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  • 2023
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  • 1976-6300(pISSN)
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  • 2508-7150(eISSN)
항공우주시스템공학회 (The Society for Aerospace System Engineering)
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광대역 레이다 흡수용 W-type 육방정 페라이트-에폭시 복합 소재

W-type hexaferrite-epoxy composites for wide-band radar absorption

  • 이수미 (한국교통대학교 에너지소재공학전공) ;
  • 이태우 (한국교통대학교 에너지소재공학전공) ;
  • 강영민 (한국교통대학교 에너지소재공학전공) ;
  • 김혜민 (한국교통대학교 항공기계설계학과)
  • Su-Mi Lee (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Tae-Woo Lee (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Young-Min Kang (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Hyemin Kim (Department of Aeronautical and Mechanical Design Engineering, Korea National University of Transportation)
  • 투고 : 2022.11.21
  • 심사 : 2022.12.29
  • 발행 : 2023.02.28
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초록

본 연구에서는 SrZn2-xCoxFe16O27 화학식을 갖는 육방정 구조의 페라이트 분말을 고상법으로 합성하고 Co-Zn 함량 변화에 따른 전자기파 흡수 특성을 0.1-18 GHz의 주파수 범위와 0 ~ 10 mm 흡수체 두께 범위에서 평가하였다. 흡수체 두께에 따른 전자기파 흡수 특성은 고주파 복소 투자율과 유전율 측정 data로부터 전송선 이론을 기반으로 계산을 통해 반사손실 (RL)을 도출하였으며, 일부 시료에 대해서는 RL 실측정을 통해 계산된 결과와 잘 맞는 것을 보였다. Co의 치환량 (x)에 따라 고주파 복소 투자율 특성이 변화하였으며 이에 따라 전자기파 흡수 주파수 대역의 조절이 가능하였다. 또한 x = 1.0, 1.25, 1.5 시료에서는 매우 우수한 최대 전자기파 흡수 특성 (RL = -70 ~ -50 dB )을 보이며, 90% 이상의 전자기파 에너지를 흡수 (RL ≤ -10 dB) 하는 주파수 밴드 폭 또한 10 GHz 이상으로 광대역 레이다 흡수가 가능함을 보였다.

In this study, hexagonal ferrite powder with chemical formula SrZn2-xCoxFe16O27 was synthesized by a solid-state reaction method and its electromagnetic (EM) wave absorption characteristics were evaluated in the frequency range of 0.1-18 GHz with absorber thickness range of 0 - 10 mm. Reflection loss (RL) affecting electromagnetic wave absorption performance was calculated based on the transmission line theory using measured complex permeabilities and permittivities. RL spectra were also directly measured for some samples. They were well matched with calculated results. High-frequency complex permeability characteristics were changed gradually according to the amount of Co substitution (x). The EM wave absorption frequency band could be tuned accordingly. Hexaferrite samples with x = 1.0, 1.25, and 1.5 exhibited remarkable maximum electromagnetic wave absorption performances with minimum RL (RLmin) lowered than -50 dB. They also showed a very broad frequency band (Δf > 10 GHz) in which more than 90% of the EM wave energy absorption occurred (RL ≤ -10 dB).

키워드

과제정보

이 논문은 2022년도 정부 (과학기술정보통신부)의 재원으로 한국연구재단 기본연구 사업의 지원을 받아 수행된 연구임 (No. 2022R1F1A1062933)

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