Design and tuneable magnetodielectric ferrite-based meta-absorbers for high-frequency microwave absorption applications
MATERIALS RESEARCH BULLETIN(2024)
摘要
EM absorbers with outstanding absorption, shielding capability, and dissipation performance are still challenging in hostile environments. To address the EMI issues, the meta-absorbers of the spinel-based structure were designed and prepared. Herein, Zr-In co-substituted Ni-Zn nano ferrites with the composition of Ni0.7Zn0.3(ZrIn)xFe2-2xO4 for 0 <= x <= 0.20 with 0.05 step size were prepared using the citrate-gel self-ignition route. The characteristic features of the Zr-In doped NiZn nano ferrites were evaluated from FESEM, XRD, FTIR, and VSM, respectively. The bond lengths and unshared-shared edges in Zr-In doped NiZn ferrite were estimated using the Bertaut method. FTIR analysis confirms the occurrence of phase in Zr-In co-substituted Ni-Zn ferrite. The micrographs of Zr-In doped NiZn ferrite show circular and hexagonal mixed-shaped particles. SFD and highfrequency response from the Zr-In doped NiZn ferrites were evaluated. NiZn ferrite shows higher SFD at the high-frequency response than Zr-In doped NiZn ferrite. The dielectric measurements were captured using VNA in the frequency range from 1 GHz to 6 GHz. The minimum reflection loss of -61.5 dB at 2.43 GHz was observed for the x = 0.20 sample. However, the reflection loss of -57.3 dB at 1.93 GHz was achieved for the x = 0.15 sample. Metaabsorbers of rod-like Zr-In doped NiZn were designed and simulated. The absorption resonance peak was observed at 5.8 GHz with maximum absorptivity for Zr-In doped NiZn absorber at x = 0.15, respectively. The present study reveals the planer and rod-like prepared EM irradiated Zr-In doped NiZn meta-absorber are suitable for SFD, MLCI's high-frequency EMI shielding applications in C band applications.
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关键词
Nanoferrites,XRD,MH-loops,EM irradiations,Absorption,Simulations
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