ELECTRICAL PERFORMANCE DESIGN AND EXPERIMENTAL STUDY OFPMI FOAM CORED SANDWICH COMPOSITE

Abstract

Abstract: Radome is used to protect the antenna from the influence of natural environment, while at the same time, radome needs to guarantee the normal working of the antenna. Therefore, radome not only needs to has good mechanical performance, but also need excellent electrical performance. Thus, it is important to choose suitable materials and structure of radome. The polymethacrylimide (PMI) foam cored sandwich composite material has an excellent broadband penetration performance, and it is widely used to product radomes. Previous studies have found that electrical performance of radomes is connected with material system, structure type, thickness of face and thickness of core. In order to design a radome which meets the broadband penetration requirement, this paper chooses suitable material system, favorable structure type, optimum combination of thicknesses of face and core. Based on the principle of composite materials structure, the structure type is A-type sandwich structure, the face of the sandwich composite is quartz glass reinforced epoxy resin composite materials and the core of the sandwich composite is PMI foam. Both the materials of face and core have lower dielectric constant, lower dielectric loss and higher strength than most other material systems. Next, the effects of thicknesses of face and core on the wave permeability of A-type sandwich structure are calculated by CST software. Insertion loss-frequency curve can be obtain by putting thicknesses of face and core and frequency region into the CST software. According to the result of CST software, the theoretically optimum structure is obtained. In this paper, the theoretically optimum thicknesses of face and core are 0.5 mm and 15.6 mm. Then the A-type sandwich composite plate specimen is produced by vacuum bag molding process to test and verify the theoretically optimum structure. Further plate experimentation suggests that the experimental data agrees well with software test values. Therefore, the A-type PMI foam cored sandwich structure composite in this paper can meet the broadband penetration performance of a certain type of radome.

Key words: PMI foam sandwich composite, electrical performance, thickness of face, thickness of core, CST software

CLC Number:

TB332

SHAN Zhong-wei, BIAN Jia-yan, CHENG Xiang, LIU Jun. ELECTRICAL PERFORMANCE DESIGN AND EXPERIMENTAL STUDY OFPMI FOAM CORED SANDWICH COMPOSITE[J]. Fiber Reinforced Plastics/Composites, 2016, 0(4): 82-87.

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