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Microwave absorption properties of the nanocrystalline strontium ferrite (SrFe_(12)O_(19)) and iron (α-Fe) microfibers for single-layer and double-layer structures are investigated in a frequency range of 2 GHz-18 GHz.For the singlelayer absorbers,the nanocrystalline SrFe 12 O 19 microfibers show some microwave absorptions at 6 GHz-18 GHz,with a minimum reflection loss (RL) value of 11.9 dB at 14.1 GHz for a specimen thickness of 3.0 mm,while for the nanocrystalline α-Fe microfibers,their absorptions largely take place at 15 GHz-18 GHz with the RL value exceeding 10 dB,with a minimum RL value of about 24 dB at 17.5 GHz for a specimen thickness of 0.7 mm.For the doublelayer absorber with an absorbing layer of α-Fe microfibers with a thickness of 0.7 mm and matching layer of SrFe 12 O 19 microfibers with a thickness of 1.3 mm,the minimum RL value is about 63 dB at 16.4 GHz and the absorption band width is about 6.7 GHz ranging from 11.3 GHz to 18 GHz with the RL value exceeding 10 dB which covers the whole K u-band (12.4 GHz-18 GHz) and 27% of X-band (8.2 GHz-12.4 GHz).
Microwave absorption properties of the nanocrystalline strontium ferrite (SrFe 12 O 19) and iron (α-Fe) microfibers for single-layer and double-layer structures are investigated in a frequency range of 2 GHz-18 GHz. For the singlelayer absorbers, the nanocrystalline SrFe 12 O 19 microfibers show some microwave absorptions at 6 GHz-18 GHz, with a minimum reflection loss (RL) value of 11.9 dB at 14.1 GHz for a specimen thickness of 3.0 mm, while for the nanocrystalline α- Fe microfibers, their absorptions largely take place at 15 GHz-18 GHz with the RL value exceeding 10 dB, with a minimum RL value of about 24 dB at 17.5 GHz for a specimen thickness of 0.7 mm. For the doublelayer absorber with an absorbing layer of α-Fe microfibers with a thickness of 0.7 mm and matching layer of SrFe 12 O 19 microfibers with a thickness of 1.3 mm, the minimum RL value of about 63 dB at 16.4 GHz and the absorption band width of about 6.7 GHz ranging from 11.3 GHz to 18 GHz with the RL value exceeding 10 dB which covers the whole K u-band (12.4 GHz-18 GHz) and 27% of X-band (8.2 GHz-12.4 GHz).