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An acoustic absorber made of a two-layer granular aerogel structure, an impedance matching layer and an absorbing one, has been designed.
The results show that using CoFe2O4 as matching layer and CI as absorbing layer can greatly expand the coating absorption bandwidth and decrease the reflectance peak.
A double-layer absorbing material was designed using the two composites materials as a matching layer and an absorption layer, respectively.
The double-layer absorbers, consisting of 30 wt% CNZF composite as matching layer and 30 wt% rGO composite as absorption layer, with total thickness of 2.5 mm, exhibited a maximum reflection loss (RL) of −49.5 dB at 16.9 GHz, as well as an effective bandwidth below −10 dB of as wide as 6.0 GHz from 12.0 GHz to 18.0 GHz.
Four array configurations are presented – (1) array with both matching and pedestal backing layers, (2) array with a matching layer but no backing pedestal, (3) array with a backing pedestal but no matching layer, and (4) array with neither matching layer nor backing pedestal.
While when PANI and PANI/Fe3O4 composite are acted as matching layer and absorbing layer, respectively, with the same thickness of 0.5 mm, a minimum RL value of −54 dB is observed at 33.72 GHz and the absorption bandwidth is about 11.28 GHz ranging from 27.24 to 38.52 GHz with the RL value below −10 dB.
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To reduce the error between actual operations and numerical simulations, thereby enabling effective design parameters to be obtained during the sensor production process and increasing the precision of simulated results, we integrated theories relevant to the perfectly matched layer and perfectly reflecting boundary condition with the finite element method and eigenmode expansion method.
In this simulation, the z-direction has two perfectly matched layers, and the periodic boundary conditions are set in the x- and y-directions.
In our FDTD simulations, the studied region was a 3 μm × 3 μm rectangle surrounded by perfectly matched layers, and the size of the mesh was set to 2 nm.
The double-layer microwave absorbers have better microwave absorbing properties than those of single-layer microwave absorbers, and the microwave absorbing properties of the double-layer structure are influenced by the coupling interactions between the absorbing layer and matching layer.
The model is applied to a reciprocal transducer system, as used in many engineering applications including ultrasonic flowmeter applications and blood-velocity measurement setups, where the transducer consists of a PZT5 piezoceramic layer and a matching layer.
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