Performance Analysis of Carbon Composite Materials with VARI Method for Electromagnetic Interference Applications

This paper presents the performance analysis of carbon composite materials with vacuum assisted resin infusion (VARI) method for electromagnetic interference shielding (EMIS) application. The structure was implemented using the VARI fabrication method and intended for shielding the synthetic aperture radar (SAR) instrument mounted on medium altitude long endurance (MALE) drone under development in Indonesian National Aerospace Agency. This structure is developed to shield and protect the radar subsystems from electromagnetic interference from other subsystems such as avionics and payload systems. The S-parameters measurements have been done in the anechoic chamber using vector network analyzer (VNA). The shielding effectiveness of the material is evaluated over 0.9 GHz and 5.3 GHz frequency bands using S11 for reflection factors and S21 for transmission factors to investigate the material characteristics. All of the material has fluctuated value. The quite stable value in 0.8–1 GHz S21 (dB) was carbon twill vinyl.