Bandstop Passive Filter Characteristics of Hexagonal Ferrite Composites at X-Band
In wireless communication, filters are incorporated to allow/stop the desired range of frequencies depending upon the application. The composites of M-type hexagonal ferrite Ba0.5Sr0.5CoxTixFe12-2xO19 and Polyaniline (PANI) have been prepared with the volume fraction of 30:70 percent. Composite samples were fitted at one end of the rectangular waveguide and a vector network analyzer was interfaced with two ports of rectangular waveguide. The microwave characteristics of composite samples were measured from 8.2 GHz to 12.4 GHz by a vector network analyzer with the help of scattering parameters. The dielectric loss tangent was found to be more than magnetic loss tangent in all compositions. The doping of Co2+-Ti4+ ions and good electrical conductivity of PANI altogether increased attenuation in the microwave signal. Composition x = 0.6, 0.8 and 1.0 have − 10 dB bandstop bandwidth of 4.2 GHz covering the whole investigated frequency band, while composition x = 0.8 and 1.0 exhibited a rapid rate of fall in attenuation after 10 GHz. Composition x = 0.8 has maximum attenuation of − 40.9 dB at 12.4 GHz. The results suggest that prepared compositions can be useful for wideband bandstop passive filter application.
Journal of Electronic Materials
Singh, C., Bai, Y., Narang, S., Mishra, S., Singh, D., Sombra, A., Jotania, R., & Trukhanov, S. (2019). Bandstop Passive Filter Characteristics of Hexagonal Ferrite Composites at X-Band. Journal of Electronic Materials, 48 (10), 6189-6193. https://doi.org/10.1007/s11664-019-07424-y