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The microwave properties of epoxy composites filled with 30 wt.% of BaFe 12– x  Ga  x  O 19  (0.1 ≤  x  ≤ 1.2) and with 1 wt.% of multi-walled carbon nanotubes (CNTs) were investigated in the frequency range 36–55 GHz. A sufficient increase in the microwave shielding efficiency was found for ternary 1 wt.%CNT/30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy composites compared with binary 1% CNT/epoxy and 30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy due to the complementary contributions of dielectric and magnetic losses. Thus, the addition of only 1 wt.% of CNTs along with 30 wt.% of barium hexaferrite into epoxy resin increased the frequency range where electromagnetic radiation is intensely attenuated. A correlation between the cation Ga 3+  concentration in the BaFe 12– x  Ga  x  O 19  filler and amplitude–frequency characteristics of the natural ferromagnetic resonance (NFMR) in 1 wt.%CNT/30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy composites was determined. Higher values of the resonance frequencyf   r  e  s(51.8–52.4 GHz) and weaker dependence off   r  e  son the Ga 3+  concentration were observed compared with pressed polycrystalline BaFe 12– x  Ga  x  O 19  (f   r  e  s= 49.6–50.4 GHz). An increase in the NFMR amplitude on the applied magnetic field for both random and aligned 1 wt.% CNT/30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy composites was found. The frequency of NFMR was approximately constant in the range of the applied magnetic field, H = 0–5 kOe, for the random 1 wt.% CNT/30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy composite, and it slightly increased for the aligned 1 wt.% CNT/30 wt.% BaFe 12– x  Ga  x  O 19 /epoxy composite.

Electromagnetic Properties of Carbon Nanotube/BaFe12−xGaxO19/Epoxy Composites with Random and Oriented Filler Distributions