Tuning of Microwave Absorption Properties and Electromagnetic Interference (Emi) Shielding Effectiveness of Nanosize Conducting Black-Silicone Rubber Composites Over 8-18 GHZ

Abstract

Abstract-In this paper, studies on broadband microwave absorption and electromagnetic shielding effectiveness are reported in flexible rubber composites with low filler content of nanosize conducting carbon over 8-18 GHz frequency range of electromagnetic spectrum. Rubber based composites are prepared by loading of 1-15 wt% nanosize conducting Carbon Black (CB) in silicone rubber matrix. Effect of percentage loading of nanosize CB on DC conductivity, dielectric & microwave absorption properties and electromagnetic Shielding Effectiveness (SE) of silicone rubber composites is studied. The percolation threshold is achieved at low concentration (3 wt%) of CB in composites. The observed complex permittivity values revealed that composites with concentration of 5 wt% CB can provide more than 90% microwave absorption (Reflection Loss > −10 dB) over 8-18 GHz at composite thickness of 1.9-2.7 mm. Further, composites with concentration of 15 wt% of CB shows −40 dB SE over the broad frequency range 8-18 GHz at thickness 2.8 mm. The effect of composite thickness on microwave absorption properties and shielding effectiveness is also analyzed. Thus, the prepared rubber composites with suitable concentration of nanosize CB as filler may be used as microwave absorber in stealth applications as well as for EMI shielding of electronic equipments in various civilian and military areas.

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

“…The application of carbon black and ferrites into the polymer matrices in order to prepare composites with the effects of EMI shielding has been the subject of various scientific studies [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. The results have shown that application of both fillers leads to the preparation of polymer composites that can efficiently shield the harmful electromagnetic radiation.…”

Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers

“…The preparation and investigation of polymer composite shields by the application of ferrites and carbon-based fillers into various polymer matrices has been the interest of many experimental studies [18][19][20][21][22][23][24][25]. The results have demonstrated that composites filled with those fillers can effectively shield EMI.…”

Progress in polymers and polymer composites used as efficient materials for EMI shielding

“…In generally, smaller particles of CB together with higher structure and low volatility (fewer chemisorbed oxygen groups) shift towards higher conductivity in polymer composites [177]. black was the main aim of the study [180]. The results showed that the percolation threshold was reached even at lower amount of carbon black in the rubber matrix that in the previous case (3 wt.…”