▎ 摘　　要

The use of polymer composites containing ferrite based magnetic fillers and conducting fillers are highly appreciated as materials for microwave shielding. In this regard, herein we present systematic optimization of compositional parameters by varying CoFe2O4 and MWCNT/Graphene nanoplatelets to achieve efficient elec-tromagnetic shielding in Low density polyethylene (LDPE) polymer. The magnetic filler, CoFe2O4 was prepared by facile solution combustion process and the chemically exfoliated Graphene and CVD-derived MWCNT are used as conducting filler. Various compositions containing different weight ratios of CoFe2O4 and Graphene nanoplatelets on the EMI shielding efficiency of LDPE composite is studied (keeping MWCNT weight constant) using vector network analyzer in the frequency range of 8-12 GHz. The critical concentration of all the materials in bringing synergy was evaluated. The combination of LDPE:MWCNT:GNP:CoFe2O4: 50:5:40:5 was found to be optimum concentration to bring a synergetic effect for gaining excellent dielectric, ohmic and magnetic losses in the X-band. Maximum total shielding effectiveness of about 49 dB was achieved at 10.3 GHz within the fre-quency range studied.