X-band shielding of electromagnetic interference (EMI) by Co2Y barium hexaferrite, bismuth copper titanate (BCTO), and polyaniline (PANI) composite
Co2Y/BCTO/PANI composite was synthesized using mechanical blending method. The XRD analysis shows that the composite exhibit pure phase of Co2Y barium hexaferrite and bismuth copper titanate (BCTO) which is also supported by Raman analysis. Resonance occurs over the whole frequency region in the spectra of Co2Y/BCTO/PANI composite with dielectric losses dominating the lower frequency region due to interfacial polarization and magnetic losses dominating the higher frequency region as a result of eddy current losses, natural and exchange resonance. The observed values of shielding effectiveness for reflection are higher than those of shielding effectiveness for absorption, this indicates that most of the incident EM wave is reflected rather than absorbed. The Co2Y/BCTO/PANI composite shows total shielding effectiveness value above 20 dB with maximum total shielding effectiveness value of 31.97 dB at 10.30 GHz and matching thickness of 2 mm. The high value of total shielding effectiveness is attributed to good impedance matching between the components of the Co2Y/BCTO/PANI composite as well as higher dielectric losses as compared to magnetic loses.