Microwave absorption performance of barium hexaferrite multi-nanolayers

Abstract

In this work, the microwave absorption performance of barium hexaferrite multi-nanolayers synthesized by aceramic method was investigated. The microwave absorption performances of BaFe12O19 and BaCoZnFe10O19 multi-nanolayers with thicknesses of 25, 50, 75, 100, 200, 300, 500, and 1000 nm were evaluated using a vector network analyser (VNA) at room temperature to characterize the reflected signal (S11) and transmitted signal (S21) in the frequency range of 7–13 GHz. The microwave absorption performance of the multilayer structure was enhanced due to the combination of nanolayers. The optimal absorption performance was achieved with a reflection loss of less than –30 dB (99.9% absorption) for a layer thicknesses of less than 500 nm.

Microwave Absorption Properties of Ba0,9 Ca0,1 Fe12O19/Fe2O3 Nanocomposite Prepared using Planetary Ball Milling

“…The real (ε') and the imaginary part (ε") of permittivity remains decreased in the frequency range of 7.5 -8.75 GHz (Figure 2b) and tend to fluctuations in the frequency range of 9.75 -13 GHz. 𝑐𝑐 � √ 𝜇𝜇𝜇𝜇�, where the input impedance Z in , impedance of free space Z o , complex permeability µ, complex permittivity ε, microwave frequency f, velocity of microwaves in free space c, thickness d [15]. As shown in Figure 3, the lowest RL is -38.42 dB at 11.66 GHz with a thickness of only 4 mm and RL below -10 dB (>90% absorption) is 1.83 GHz (7.67-9.50 GHz) for the absorber with a thickness of 1-5 mm.…”

Development of Ba0.6Ca0.4Fe12O19/Fe3O4/Sio2 Composite Material For Microwave Absorption Applications At X-Band Frequency Range

“…By NRW method using signals parameters, the complex permeability (µ) and permittivity () values were obtained. The reflection loss (RL) with various thicknesses of Ba0.6Ca0.4Fe12O19/Fe3O4/SiO2 composite materials was calculated through transmission line theory using the equations [12,13]:…”

Electromagnetic Properties of Carbon Nanotube/BaFe12−xGaxO19/Epoxy Composites with Random and Oriented Filler Distributions

“…Multi-nanolayer structures showed high perspectives relative to microwave absorption performance. Thus, single-layer and multilayer samples were investigated in detail in [20], where absorbers with BaFe 12 O 19 and BaCoZnFe 10 O 19 layers of different thicknesses were designed. The absorber was optimized due to the combination of nanolayers; a reflection loss of less than −30 dB (99.9% absorption) for layer thicknesses of less than 500 nm was achieved [19].…”