Comparison of Ku (12.4–18 GHz) and K (18–26.5 GHz) Band Microwave Absorption Characterization of Co-Zr Co-substituted Ni-Zn Ferrites

• Published in: Journal of electronic materials 2021-09, Vol.50 (9), p.5338-5347
• Main Authors: Aggarwal, Neha, Narang, Sukhleen Bindra
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt; Composition; Dielectric loss; Dielectrics; Electronics and Microelectronics; Instrumentation; Magnetic permeability; Magnetic properties; Materials Science; Microwave absorption; Nickel; Optical and Electronic Materials; Original Research Article; Permeability; Sol-gel processes; Solid State Physics; Substitutes; Zinc; Zirconium
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-021-09052-x

The microwave absorption behaviour of nano-scale cobalt-zirconium co-substituted nickel-zinc ferrites Ni 0.6 Zn 0.4 (CoZr) x Fe 2-2x O 4 (x = 0.05, 0.10, 0.15, 0.20 and 0.25) synthesized via a sol–gel citrate precursor is reported in K u (12.4-18 GHz) and K (18-26.5 GHz) band frequencies. The dielectric characterization of the ferrites exhibits that values of real permittivity ( ε ′) decrease over the range of K u band frequencies but less dispersion is found in the K band. Dielectric losses are found to be maximum in composition Ni 0.6 Zn 0.4 (CoZr) 0.25 Fe 1.5 O 4. The magnetic characterization exhibits that real permeability ( μ ′) has a constant trend over the increasing range of frequencies but prominent peaks are observed in the spectra of imaginary permeability ( μ ″). Highest magnetic losses are observed for composition Ni 0.6 Zn 0.4 (CoZr) 0.25 Fe 1.5 O 4 similar to dielectric losses . The reflection loss (RL) minima of −42.83 dB at 16.992 GHz and −26 dB at 18.68 GHz is found for the same composition in K u and K band, respectively, with a matching thickness of 2 mm.