尖晶石结构磁介电材料的研究进展

Research Progress in Magneto-Dielectric Materials with Spinel Structure

随着通信技术的发展,对无限通信设备的集成度有了更高的要求,天线小型化成为目前重要的研究方向。等磁介电材料是一种既具有磁导率又具有介电常数,且磁导率和介电常数几乎相等的材料,使用等磁介电材料作为天线的基板,能有效的减小天线的尺寸,提高带宽,增加辐射效率。铁氧体是由Fe2O3和一种或多种金属氧化物复合而成,具有较高的磁导率和介电常数,由于其同时具有磁特性和介电特性,是一种潜在的等磁介电材料。综述了近几年尖晶石结构磁介电材料的国内外研究进展,着重讨论了掺杂改性对烧结温度、磁导率、介电常数、直流电阻等电磁特性的影响。最后指出目前研究中存在的问题,并展望了该材料在未来发展的方向。

With developing of the communication technology, wireless communication systems have created an increased demand for being compact, antenna miniaturization attract much interest these years. Magneto-dielectric materials have almost equal values of real permeability and permittivity. Magneto-dielectric as a substrate for antennas is to miniaturize the size and enhance the bandwidth as well as radiation efficiency. Ferrite is a potential magneto-dielectric which posses both magnetic and dielectric property simultaneously. Ferrites are materials in which Fe2 03 combined with one or more other metal oxides, and have high magnetic permeability and high electrical resistivity, so they can be applied in the high fre- quency. In this letter, the developing process of magneto-dielectric materials is reviewed, the effect of dopants on sintering temperature, permeability, permittivity, DC resistivity are discussed. At last we point out the magneto-dielectric material is a promising material for antenna miniaturization, and the development direction of magneto-dielectric materials.