Conductive polymer composite with well controlled morphologies is an effective approach to achieve high charge storage ability. This study demonstrates the use of submicron size insulative junctions of magnetite (Fe3O4) in conductive networks of multiwall carbon nanotubes (MWNTs) for enhanced charge storage in X-band (8.2 to 12.4 GHz) frequency range. Dielectric properties and electromagnetic interference (EMI) shielding performance of fluoroelastomer (FKM) based nanocomposites containing conductive MWNTs anchored with magnetite particles (MWNT@Fe3O4) are analyzed in X-band frequency range. Herein, electrical conductivity in FKM matrix was rendered by dispersionvia networks of MWNTs whereas Fe3O4 particles were employed as an insulative spacer between MWNT networks. The enhanced charge storage ability along with a small dielectric loss in X-band frequency was achieved, at a given amount of MWNTs, by employing the unique approach where relatively large (i.e. sub-micron size) insulative Fe3O4 spacers were anchored to MWNT networks leading to disturbed disrupted conductive networks of MWNTs. The size of Fe3O4 particles was controlled such wayso that the distance between discrete MWNTs at the insulative junction is larger than the critical distance required for hopping and tunneling of nomadic charges. The anchoring of sub-micron size Fe3O4 particles with MWNTs preserved large real permittivity (εꞌ) along with thewhile providing favorably decreased dielectric loss (tan δε = εꞌ /ε"). For instance, FKM nanocomposites containing MWNT@ Fe3O4 with 2 phr of MWNTs depicted frequency independent εꞌ of 12.3 along with Tan tan δε of 0.14 suggesting the material has remarkable ability to store charges in X-band frequency range. The EMI shielding effectiveness (SE) of FKM nanocomposites scaled with a degree of conductive networks of MWNTs and the presence of magnetic dipoles.