丝材长度对CoFeSiBCr玻璃包覆丝复合膜噪声抑制的影响

通过动态样品磁强计测试CoFeSiBCr玻璃包覆非晶丝的静态磁滞回线,发现其不具有轴向畴。制备了含玻璃包覆非晶丝的膜状噪声抑制材料,采用微带线测试系统测试微波散射参数并计算出功率损耗比,研究丝材长度对复合膜微波噪声抑制特性的影响。结果表明:随着丝材长度的增大,复合膜样品的S21曲线在测试频率范围内出现吸收峰,且峰值对应的频率逐渐减小。复合膜禁带带宽随着丝材长度的增大而增大。丝材长度为20 mm时,复合膜的禁带带宽最大,达7.1 GHz,1.8~8.5 GHz时功率损耗比高于75%,在千兆赫兹频率范围内具有较好的噪声抑制效果。

Influence of wire length on noise suppression of composite films containing CoFeSiBCr glass-covered wires

The static hysteresis loop of CoFeSiBCr glass-covered amorphous wires was measured by vibrating sample magnetometer.The wires have no axial domains.The noise suppression film materials containing Co-based glass-covered amorphous wires were prepared for the first time.The microwave parameters were measured by microstrip measurement system,and the power loss rate was figured out.The influence of wire length on microwave noise suppression effect of the composite films was investigated.The results show that absorption peaks appear in the measuring frequency range for the S21 curves of the composite films when the wire length increases,and the frequencies corresponding to the absorption peaks increase with the increase of wire length.The stopband of the composite films increases with the increase of wire length.For the sample with wire length of 20 mm,the power loss rate is above 75% between 1.8 GHz and 8.5 GHz.That is an excellent noise suppression effect in the range of gigabyte Hz.