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Conducting polymer nanocomposites of polyphenyl amine with barium ferrite nanoparticles (50–70 nm) have been synthesized via emulsion polymerization. The complex permittivity, permeability, and microwave absorption properties of the composite were studied in the 12.4–18 GHz (Ku band) frequency range. The composite has shown high shielding effectiveness due to absorption (SE A) of 28.9 dB (∼ 99.9%)⁠, which strongly depends on dielectric loss, magnetic permeability, and volume fraction of barium ferrite nanoparticles. The high value of SE A suggests that these composites can be used as a promising radar absorbing materials.