Design and preparation of low-loss Ba(CoTi)M-spinel hybrid ferrites for broadband magnetic-dielectric resonator antenna application

Abstract

In this work, a novel Ba(CoTi)M-spinel magnetic composite with excellent microwave dielectric-magnetic properties has been developed through a hybrid ceramic process. It can be found that the spinel magnetic nanocrystals are uniformly dispersed at the Ba(CoTi)M grain boundary, while the formation of this particular micro-concrete structure has a good effect on ceramic densification and the reduction of magnetic-dielectric loss. The composite exhibits stable electromagnetic parameters in the S and C bands, as evidenced by a permittivity of about 8, a permeability value exceeding 2, and a relatively low magnitude of tanδε and tanδµ on the order of 10−2. A magnetodielectric resonant antenna operating at 6.2 GHz with a −10 dB impedance bandwidth of 27.4%, and a low profile of 0.14λ0 was designed, fabricated, and measured based on the hybrid ferrite. The hybrid ceramic scheme plays a crucial role in designing low-loss magnetic media, possessing significant application value in high-performance microwave antennas.