Co2Z hexaferrites with equivalent permeability and permittivity in UHF band

With the development of modern communication technology, all kinds of wireless communication devices are developing rapidly toward miniaturization, lightweight, and integration, which puts forward higher requirements for the size and volume of the antenna. In recent years, magneto-dielectric ferrite materials have been widely studied because of their good performance in magnetic and dielectric properties. In this work, a series of Ba1.5Sr1.5Co2-xFe24+xO41 (x = 0, 0.2, 0.4, 0.6) materials were successfully synthesized through the traditional solid-state reaction method. The influences of Fe substitution on the phase formation, microstructure, high-frequency dielectric, and magnetic properties were studied. It is found that, with the increase of substitution amount, the real permeability decreases from 8.8 to 4.2, and the real permittivity increases from 7.6 to 9.8. When the amount of substitution is relatively low (x = 0, 0.2), the real permeability and permittivity of the materials are almost equivalent at the frequency of 500 MHz to 1.0 GHz. The sample of x = 0.2 with permeability (7.1 to 8.2) and permittivity (7.8), and low losses (tan delta(mu) <= 0.22, tan delta(epsilon) <= 0.02) could be used for antenna miniaturization in UHF band in the future.