Fei Jia
ABSTRACT
Electromagnetic shielding is an important means to suppress electromagnetic interference, and it is also the primary method of electromagnetic compatibility design. Based on the electromagnetic topological decomposition theory, this paper studies the performance analysis method of aluminized glass fiber composite materials for electromagnetic shielding. Based on the electromagnetic topological decomposition theory and the principle of good shielding, the load process of plane wave interfering with transmission line in slotted chassis is decomposed into two relatively independent subproblems. The voltage BLT equation is constructed by using Agrawal field-line coupling model, and the interference voltage of transmission line load is calculated. Through testing and analysis, it is found that the aluminum-coated glass fiber as conductive filler still has threshold property under a certain length, and the shielding effectiveness of the material begins to keep stable after the filler content is greater than 40wt%. Among the three kinds of glass fiber materials with different structures, the dielectric constant value of plain twisted glass fiber fabric and its composites is smaller than that of plain untwisted glass fiber fabric and its composites. Among the three kinds of glass fiber composites with different structures in this paper, plain twisted glass fiber composites have the best electromagnetic performance and are most suitable for application in the electrical field.
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