Design and tuneable magnetodielectric ferrite-based meta-absorbers for high-frequency microwave absorption applications

Abstract

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 high-frequency 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.