Nanocomposite microwave absorbing coatings using Ni-Co-P/CNT andNi-Co^ Co-? > Ni-P/fly ash cenospheres composite powders as absorbers had better microwave absorbing properties and the highest reflectivity could reach to 18.7dB. Minishing absorber granularity, increasing the content of absorbers, adjusting the layer numbers to obtain optimal coating thickness, choosing proper resin and solvent could help us to enhance the microwave reflectivity of coating samples.
On the base of classical electromagnetic theory,the paper has created a mathematical model for electromagnetic wave absorption of multilayer composite materials and analysed the influence of electromagnetic constants (μ, ε and σ), thickness (d) and different combined structures on the microwave reflectivity of multilayer composite materials.
The effects of magnetic permeability),dielectric constant),electrical conductivity (σ)and thickness (d) of composite, parameter combination and layer arrangement order of multilayer film on the microwave reflectivity have been discussed through the calculation of reflectivity.
The characteristics of microwave reflectivity are studied theoretically and experimentally. Microwave reflectometer is constructed. Microwave radiation transfer of reflection in the process of near field is studied. Microwave reflectivity of natural ground truth in X-band, for example, water, sand and oil slick on water surface is measured. The experimental results are in agree with the theoretical prediction. The characteristics and the application in microwave rem...
Reflectivity of ground truth is an important information of remote sensing. Experiments in lab are carried to study characteristics of microwave reflectivity in order to provide guidance for practice. In the first, how to transform the lab near field data to the natural far field must be solved. In this work, microwave reflectivity in the near field and retrieval of the near field data to the far field condition are studied theoretically. In the last, the correction is checked ...
Microwave reflectivity of epoxy matrix composite containing Mn-Zn ferrite sintered at different temperatures such as 1100℃ , 1200℃ , 1300℃ , 1400℃ and 1500℃ is measured in the frequency range of 11.0GHz to 18.0 GHz. The phase constitution of the Mn-Zn ferrite is analyzed by X-ray diffraction. It is found that Mn-Zn ferrites sintered at different temperatures have the same main phases, while the relative content of the same kind is different. The higher the sintering temperature is, the more cont...