Properties of NixZn(1?x)Fe2O4 thick films at microwave frequencies
The thick film NixZn(1?x)Fe2O4 on alumina substrate was prepared by screen printing of the ferrite powder synthesized by chemical co-precipitation method using nitrate precursors. These NixZn(1?x)Fe2O4 thick films of varying x were characterized by X-ray diffraction, FTIR spectroscopy and SEM (scanning electron microscopy). The permittivity and permeability were measured by overlay technique. Voltage standing wave ratio method was also used to measure the dielectric constant. The permittivity was found to increase with Ni content varying between 13 and 18. The permeability was ?3.01. The overlay technique provides an easy method for measurement of permittivity and permeability of ferrite thick film.
permittivity permeability overlay ferrite thick film microstrip antenna