Dual nonlinear dielectric resonance and strong natural resonance in Ni/ZnO nanocapsules

X. G. Liu; J. J. Jiang; D. Y. Geng; B. Q. Li; Z. Han; W. Liu; Z. D. Zhang
February 2009
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
Academic Journal
The electromagnetic characteristics of Ni/ZnO nanocapsules were studied at 2–18 GHz. The dual nonlinear dielectric resonance and strong natural resonance at 16.6 GHz contribute to excellent electromagnetic absorption. A reflection loss (RL) exceeding -20 dB was calculated in 14–18 GHz for an absorber thickness of 2.05 mm, and RL exceeds -10 dB in the whole X-band (10–12.4 GHz) and the whole Ku-band (12.4–18 GHz) for a thickness of 2.50 mm. The equivalent circuit model was used to explain the dual nonlinear dielectric resonance, which is ascribed to a cooperative consequence of the core/shell interfaces and the dielectric ZnO shells.


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