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Structure diagram of RAM. The circular radius is a and the period length is C, the thickness of ceramic layer is t. (a) Top view, (b) side view.
Source publication
A radar absorbing material (RAM) is designed by combining the La0.5Sr0.5CoO3/Al2O3 ceramic and the metal periodic structure. The phase constitution and the microscopic morphology of the La0.5Sr0.5CoO3/Al2O3 ceramic are examined, respectively. The electrical properties and magnetic properties of the La0.5Sr0.5CoO3/Al2O3 ceramic are also measured at...
Contexts in source publication
Context 1
... effects of the structural parameters of the metal periodic structure on the absorption performance of La 0.5 Sr 0.5 CoO 3 /Al 2 O 3 materials are studied at a high temperature environment, and the electromagnetic coupling and energy loss density of the RAM are analyzed in the 25~500 • C temperature range. Figure 1 exhibits the structural diagram of the RAM. The RAM is divided into three parts. ...
Citations
... traditional absorbing materials are mainly divided into magnetic loss absorbing materials and dielectric loss absorbing materials. Generally, the absorption performance of microwave absorbing materials is affected by their chemical composition, microstructure, etc. [11][12][13][14][15][16] At present, there are still some problems in the research of absorbing materials, such as magnetic loss absorbing materials, which are usually composed of ferrite, hydroxy iron, and other absorbents in a certain proportion to the matrix. Their wave absorbing performance is very good, but their density is often large, which is a significant burden in practical applications, and there are problems that it is difficult to withstand heavy loads and it is difficult to apply in air and ocean scenarios. ...
The graphite/Al2O3 composite was prepared using plasma spray technology, the material design, experimental methods, and process flow are introduced. The microstructure, chemical composition, and complex permittivity of the composite are investigated, and its performance to absorb electromagnetic waves is studied. The mechanism of interaction between chemical composition, microstructure, complex permittivity, and absorption performance is analyzed. Furthermore, a microwave absorber composed of graphite/Al2O3 and sheet resistance, and performance is discussed. The reflectivity of the composite coating with different periods and sizes and resistances is analyzed. The impedance and reflectivity of the designed absorber that contains sheet resistance are discussed, and its absorption mechanism is explained in detail. The results demonstrate that the microwave absorption performance of graphite/Al2O3 coating is enhanced by electromagnetic resonance of the sheet resistance. The designed absorber exhibits good wave‐absorbing performance and stability at the frequency of the 8.2–18 GHz range. When the sample thickness is 2.3 mm, the absorber achieves a reflection loss (RL) value of −16.8 dB at 9.8 GHz and a wide effective absorption bandwidth (EAB) of 9.8 GHz. It means that the RL below −10 dB can be obtained in the whole X band and Ku bands. These results proved that the EAB can be tuned and enhanced by manipulating sheet resistance.
