|
Low loss flexible dielectric and magnetic composite with SrTiO3 (STO) ultrafine particles and NiZn ferrite (NZO) ultrafine particles embedded in a Thermoplastic Polyolefin Elastomer (POE) matrix was fabricated using the extrusion technology. The dielectric and magnetic properties of the as-prepared composites with different volume fraction of ceramic fillers were investigated. The results indicate that with the increasing of the volume of ceramic fillers, the permittivity, permeability, dielectric loss and magnetic loss of the composites all increase. As the volume of the ceramic filler was fixed, with the increasing of the ratio of STO phase to NZO phase, the permittivity and dielectric loss of the composites increase while the permeability and magnetic loss decrease. The cut-off frequencies of the composites are all above 1GHz. Because of the low resistivity of NZO, the dielectric loss of the composites is high in low frequency range and decrease with frequency increasing. Good frequency stability of the electromagnetic properties within a wide frequency range was observed. With the increasing of the volume of ceramic filler, the tensile strength increases and elongation decreases. All the composites show very good flexibility. Such flexible magnetic-dielectric three-phase composites could be used in high-frequency communications for the capacitor-inductor integrating devices such as electromagnetic interference filters and antennas. |
|
Keywords:composites;Dielectric properties;Magnetic properties;Flexibility;Low loss |
|