Preparation and microwave absorbing property of carbon fiber/polyurethane radar absorbing coating

Abstract

To broaden the effective absorbing bandwidth of radar absorbing coating, carbon fiber/polyurethane radar absorbing coating (CFPURAC) is prepared with carbon fiber as filler and polyurethane as matrix, and then multi-layer CFPURAC is prepared with polyurethane coating as wave-transmitting material to match CFPURAC. Scanning electron microscope (SEM) and metallography microscope are employed to characterize the microstructure of filler and coating separately. Vector network analyzer (VNA) is adopted to test the radar wave reflectivity of coating. The results indicate that the absorbing property of coating is influenced by length and content of carbon fiber in the coating, and matching order and matching thickness of various absorbing layers to a great extent. In the optimum matching proposal, the effective absorbing bandwidth of coating is up to 13.1 GHz, and an effective absorption can be achieved within the range of 4.9 GHz to 18 GHz.

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