Enhanced microwave absorption properties of Zn-substituted SrW-type hexaferrite composites in the Ku-band
| Autor: | Seung-Young Park, Chris Yeajoon Bon, Sang-Im Yoo, Jae-Hyoung You, Sungjoon Choi |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Permittivity Materials science Process Chemistry and Technology Reflection loss Composite number 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ku band Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Electron hopping Permeability (electromagnetism) 0103 physical sciences Materials Chemistry Ceramics and Composites Composite material 0210 nano-technology Microwave |
| Zdroj: | Ceramics International. 47:7571-7581 |
| ISSN: | 0272-8842 |
| Popis: | Enhanced microwave absorption properties were successfully achievable from SrFe2-xZnxFe16O27 (SrFe2-xZnxW; x = 0.0, 0.5, 1.0, and 2.0) hexaferrite filler-epoxy resin matrix composites. The composite samples were fabricated with the filler volume fractions (Vf) of 30, 50, 70, and 90%. Compared with fully Zn-substituted SrZn2W composite (x = 2.0), unsubstituted and partially Zn-substituted SrFe2-xZnxW (x = 0.0, 0.5, and 1.0) composites exhibited much higher real and imaginary parts of complex permittivity (er), which is attributable to higher electron hopping between Fe2+ and Fe3+ ions, and also slightly higher real and imaginary parts of complex permeability (μr) due to higher saturation magnetization (Ms). Among all samples, a 2.8 mm-thick SrFe1·5Zn0·5W (x = 0.5) composite with the Vf of 90% exhibited the most appropriate for application in the region of 3.4–3.8 GHz, having the minimum reflection loss (RLmin) of −46 dB at 3.6 GHz with the bandwidth of 0.43 GHz (3.38–3.81 GHz) below −10 dB, while a 2.15 mm-thick SrFeZnW (x = 1.0) composite with the Vf of 70% showed the most appropriate for application in the region of 5.9–7.1 GHz, possessing the RLmin value of −23.7 dB at 6.6 GHz with the bandwidth of 1.38 GHz (5.85–7.23 GHz) below −10 dB. Consequently, partially Zn-substituted SrW-type hexaferrites are very promising microwave absorbers for 5G mobile communications in the Ku band (0.5–18 GHz). |
| Databáze: | OpenAIRE |
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