玻璃包覆磁性合金微丝复合媒质的微波介电性能

Microwave dielectric properties of glass-coated magnetic alloy microwires composites

利用熔融拉微丝法制备了玻璃包覆非晶态磁性合金微丝，采用微波矢量网络分析仪及同轴线法测试了不同含量和排布的玻璃包覆磁性合金微丝-石蜡复合媒质的微波复介电常数，并和铁镍合金微丝-石蜡复合媒质的介电性能进行了比较。结果表明玻璃包覆磁性合金微丝复合媒质具有比相同含量的铁镍合金微丝复合媒质具有更低的复介电常数。圆周排列的玻璃包覆磁性合金微丝复合媒质在所测试的微波频率范围内具有电偶极子共振特征，一定含量的短玻璃包覆磁性合金微丝复合媒质具有电禁带结构。讨论了含量和排列方式影响玻璃包覆非晶磁性合金微丝复合媒质微波介电性能的原因。

Glass-coated amorphous magnetic alloy microwires were prepared by the Tayor-Ulitovsky method. The effect of the different microwire concentration and arrange orientation of microwires-dielectric composites on the complex permittivity was investigated by the transmission/reflection （T/R） coaxial line method in the frequencies range of 2-18 GHz. The complex permittivity of FeNi alloy microwires-dielectric composites was comparative studied. The measured results show that complex permittivity of FeNi microwires-dielectric composites is larger than that of glass-coated microwires-dielectric composites. The values of the complex permittivity of the measured samples increase with the adding of the microwires concentration. The frequency dispersion of permittivity was governed by the microwires length and concentration. The electric dipole resonance frequency of the B-type composites shifts to higher frequency with larger microwires concentration. The electric dipole resonance mechanism of glass-coated amorphous Fe-rich microwires was discussed.