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本文通过交流磁滞回线研究了Co基玻璃包覆丝去除玻璃层前后的磁性能变化;制备了含有Co基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了复合膜的S参数,并计算出功率损耗比,由此研究了丝材玻璃层对复合膜微波噪声抑制特性的影响。实验结果显示:在5kHz频率下,制备态玻璃包覆非晶丝的矫顽力大于去除玻璃层后丝材的矫顽力。去除玻璃层使复合膜在低频的反射增大,而在高频的反射总体上有所减小。同时还使复合膜样品在低频范围内的吸收增强,样品的吸收峰变宽。丝材去除玻璃层后,复合膜样品的禁带带宽明显增大,噪声抑制特性得到提高。含有去除玻璃层后丝材的复合膜样品在1.8 GHz至8.5 GHz频率范围内功率损耗比在80%以上,具有优异的微波噪声抑制特性。
In this paper, the magnetic properties of Co-based glass-coated wires before and after the removal of the glass layer were studied by AC hysteresis loop; film-like noise suppression materials containing Co-based glass-covered amorphous wires were prepared and tested using a microstrip line test system Composite film S parameters, and calculate the power loss ratio, which studied the wire glass layer on the composite film microwave noise suppression characteristics. Experimental results show that at 5 kHz, the coercivity of the as-prepared glass-covered amorphous wire is larger than that of the glass wire after the removal of the glass layer. The removal of the glass layer increases the reflection of the composite film at low frequencies and decreases overall at high frequencies. At the same time, the absorption of the composite film sample in the low frequency range is enhanced, and the absorption peak of the sample is broadened. After removing the glass layer of wire, the band gap of the composite film samples increases obviously, and the noise suppression property is improved. The composite film samples with the glass material after the removal of the glass layer have an excellent microwave noise suppression characteristic with the power loss ratio of over 80% in the frequency range of 1.8 GHz to 8.5 GHz.