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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2023.5
- 수록면
- 1,542 - 1,554 (13page)
- DOI
- 10.1007/s12540-022-01298-2
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초록· 키워드
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Microwave absorbers are utilized to reduce electromagnetic interference, which causes device malfunctioning. A superiormicrowave absorber exhibits a high reflection loss value, high attenuation constant (α), good impedance matching ratio (Z = Zin/Z0), low thickness, and wide bandwidth (below − 10 dB). The CoNi alloy has been considered a candidate for microwaveabsorber applications owing to its high magnetization, low coercivity, and high magnetic loss. The composition of CoNi nanoparticlescan be easily modified by adjusting the [Co]/[Ni] molar concentration ratio at a constant temperature, whose synthesisrequires only 0.5 h. This study analyzes the microwave absorption properties of differently composed CoNi nanoparticles inthe GHz band. Five distinct CoNi nanoparticles (Co80Ni20, Co72Ni28,Co70Ni30,Co66Ni34,and Co52Ni48)were prepared usingthe polyol method. The Ni content considerably altered the complex permittivity among other electromagnetic parameters. A1.6 mm thick microwave absorber comprising 65 wt% Co80Ni20and 35 wt% polyurethane resin exhibited a reasonable reflectionloss of − 49.3 dB at 14.2 GHz, which was calculated using transmission line theory, and a wide bandwidth of 6 GHz. This couldbe attributed to the optimized electromagnetic parameters, interfacial polarization, attenuation constant, and magnetic loss.
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