Preparation and Application on Antenna of Soft Ferrite Core for Wireless Sensor Networks

In this paper, soft magnetic Mn–Zn ferrite samples have been prepared through oxide processes. The magnetic properties and the phase structures were investigated. It was found that the optimal sintering temperature is about 1360 °C. The initial permeability of the samples is 1700–2300, Curie temperature $T_{c}$ is about 140 °C−180 °C, and cutoff frequency fr is about 1 MHz. Moreover, the initial permeability of the samples is relatively stable, and its temperature coefficient is $\sim 10^{-6}$ /°C at the temperature range of 20 °C−60 °C. High-frequency simulation results show that the Mn–Zn ferrites samples are suitable for the application of the wireless sensor networks in theory.