Magnetodielectric Material for VHF Antenna Devices Tunable by a Low DC Magnetic Field

This study presents the performance of a magneto-dielectric material (MDM) especially developed to enable the tunability of antenna devices operating in the very high frequency (VHF) band. A current flowing through the sample, which creates a dc magnetic field inside the sample with the same symmetry as the magnetic domains, controls the magnetic susceptibility variation of the MDM. By changing the magnetization state of the MDM with a low dc magnetic field of 740
$\text{A}\cdot \text{m}^{-1}$
, a tunability of 40% can be observed. The MDM tunability at VHF frequencies is also highlighted by microwave measurements for different magnetization states.