Electromagnetic Shielding Performance of Ta-Doped NiFe2O4 Composites Reinforced with Chopped Strands for 7-18 GHz Applications

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dc.contributor.authorEmek, Mehriban
dc.contributor.authorSahin, Ethem Ilhan
dc.contributor.authorIbrahim, Jamal Eldin F. M.
dc.contributor.authorKartal, Mesut
dc.date.accessioned2026-02-27T07:33:26Z
dc.date.available2026-02-27T07:33:26Z
dc.date.issued2025
dc.description.abstractThis study reports the synthesis, structural characterization, and electromagnetic shielding performance of tantalum (Ta)-doped nickel ferrite (NiFe2O4) composites reinforced with chopped strands. Ta-doped NiFe2O4 powders were prepared via the conventional mixed-oxide route and sintered at 1200 degrees C for 4 h, resulting in a well-crystallized single-phase spinel structure. Comprehensive structural and chemical analyses were carried out using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), confirming the successful incorporation of Ta into the NiFe2O4 lattice and the uniform microstructural distribution. The ferrite powders were subsequently embedded with chopped strands and epoxy resin through hot pressing to fabricate composites with varying filler contents. The electromagnetic interference (EMI) shielding effectiveness (SE) of the composites was systematically evaluated in the 7-18 GHz frequency range using a network analyzer (NA). The optimized composite, with a thickness of 1.2 mm, demonstrated a maximum SE of 34.74 dB at 17.4 GHz, primarily attributed to interfacial polarization, dipolar relaxation, and multiple scattering effects induced by the chopped strands. The results indicate that the shielding performance of the composites can be precisely tuned by modifying the filler concentration and microstructural characteristics, enabling selective frequency-band applications. Overall, this work highlights the potential of Ta-doped NiFe2O4/chopped strand composites as lightweight, cost-effective, and high-performance candidates for advanced microwave absorption and electromagnetic shielding applications in defense, and next-generation communication technologies.
dc.identifier.doi10.3390/nano15201580
dc.identifier.issn2079-4991
dc.identifier.issue20
dc.identifier.pmid41149547
dc.identifier.urihttp://dx.doi.org/10.3390/nano15201580
dc.identifier.urihttps://hdl.handle.net/20.500.14669/4573
dc.identifier.volume15
dc.identifier.wosWOS:001603831900001
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherMDPI
dc.relation.ispartofNanomaterials
dc.relation.publicationcategoryMakale - Uluslararas� Hakemli Dergi - Kurum ��retim Eleman�
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20260302
dc.subjectshielding effect
dc.subjectTa doped NiFe2O4
dc.subjectmixed oxide
dc.subjectchopped strands
dc.subjectferrite composites
dc.titleElectromagnetic Shielding Performance of Ta-Doped NiFe2O4 Composites Reinforced with Chopped Strands for 7-18 GHz Applications
dc.typeArticle

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