圆截面非晶细丝复合材料微波噪声抑制特性的研究
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摘要
随着电子产品向高频化、数字化及小型化、便携化、集成化的方向发展,电子产品的工作频率已达GHz以上,其元器件密度也越来越高,带来严重的电磁干扰问题,使用噪声抑制材料是解决电子产品中电磁干扰的重要措施之一。高电磁损耗和高电阻率是噪声抑制片的基本要求。含玻璃包覆丝的复合材料在微波范围内不仅具有自然铁磁共振特性,同时还具有介电损耗特性。玻璃包覆非晶丝相对于金属较高的电阻率及外层的绝缘玻璃层使其可以制备高电阻率的复合材料。因此,玻璃包覆非晶丝是优良的噪声抑制材料吸波剂。本论文的目的是研究含圆截面非晶细丝(玻璃包覆非晶丝)复合材料的微波噪声抑制特性,开发高功率损耗、宽频带的新型噪声抑制材料。具体内容如下：
1、研究了丝材长度、丝材含量、丝材取向、样品尺寸等丝材分布特性指标对含随机分布和含平行分布丝材复合膜噪声抑制特性的影响,找出了最优的丝材长度、丝材含量及丝材取向。结果还表明,样品垂直于微带线方向的尺寸大于等于50mm时,样品尺寸对噪声抑制特性的影响不大。
2、研究了去除玻璃层、热处理和丝材成分对含圆截面非晶细丝复合膜噪声抑制特性的影响,结果表明去除玻璃层和热处理可以改善复合膜的噪声抑制特性。含Fe基丝材复合膜与含CoFe基丝材复合膜,受随机分布丝材长度、平行分布丝材间隔等指标影响的规律相同。
3、由含量为30根/cm2、长l0mm随机分布的去除玻璃层后Fe基丝材开发出新型宽频噪声抑制材料,其功率损耗比在1.5GHz至8.5GHz频率范围内功率损耗比大于80%,对噪声的反射在4.8%以下,具有重要的实用价值。
4、研究了含玻璃包覆丝的“三明治”噪声抑制片的噪声抑制特性,发现添加随机分布丝材使复合噪声抑制片的高功率损耗频带宽度显著增大,此方法有调节和改善传统金属颗粒噪声抑制片性能的应用价值。
5、由间隔为lmm平行分布制备态Fe基丝材制备出具有高功率损耗特性的复合膜样品,功率损耗比在2.4GHz至8.5GHz频率范围内均大于92%,对噪声的反射在3%以下。
6、研究了磁场作用对含圆截面非晶细丝复合膜噪声抑制特性的影响,结果表明磁场对某些样品具有显著的影响,且磁场对大部分样品的影响规律相同：施加磁场后产生新的衰减峰,对应的频率随着磁场增大而线性或近似线性地增大。
With development of electronic products towards high-frequency, digital and miniature, portable, multifunctional, the operative frequency of many electronic products has got above GHz. The component density increases continually too, which incur serious electromagnetic interference. Using noise suppression sheet is an important countermeasure for the interference. High electromagnetic loss and high resistivity are primary requirements of noise suppression sheet. The composite containing glass-covered wires show both nature ferromagnetic resonance and dielectric loss in microwave frequency range. The glass-covered amorphous wires could be used to made composites with high resistivity for its high resistivity and insulating glass outlet. So the glass-covered amorphous wires are good candidate materials for noise suppression.
The goals of this thesis are to investigate noise suppression effect of composites containing circular cross-section amorphous microwires (glass-covered amorphous wires) and to develop novel broadband noise suppression materials. The thesis is organized as follow:
1、 The influence of distribution characteristics of the wires on the noise suppression effect of the composites containing random distributed or parallel distributed wires were investigated, in where the distribution characteristics include wire length, wire content, wire direction and sample size. The optical wire length, wire content and wire direction are founded out. The results show that the sample size influence noise suppression effect faintly when the sample size perpendicular to the microstrip is not less than50mm.
2、 The influence of glass-removal, anneal and the composition of the wire on the noise suppression effect of the composite films containing circular cross-section amorphous microwires was investigated. The results show that glass-removal and anneal may improve the noise suppression effect of the composite films. The composite film containing Fe-based wires depends on the length of random distributed wires and on the row distance between parallel distributed wires in the same way as the composite film containing CoFe-based wires.
3、 A novel broadband noise suppression material with important practical value was developed with random distributed Fe-base wires after glass-removal with the content of30pieces/cm2and with the length of10mm, which power loss was great than80%from1.5GHz to8.5GHz.The noise reflection due to the sample is below4.8%.
4、 The noise suppression effect of the "sandwich" noise suppression sheet containing glass-covered wires was investigated. It's shown that adding the random distributed wires led to obvious increase of the frequency band with high power loss. This method posse practical value for to adjust and to improve the performance of the traditional metal granular noise suppression sheet.
5、 A composite film with advantage of high power loss was fabricated with parallel distributed Fe-base wires with the row distance of lmm, which power loss was great than92%from2.4GHz to8.5GHz.The noise reflection due to the sample is below3%.
6、 The influence of magnetic field on noise suppression effect of the composites containing circular cross-section amorphous microwires was investigated. The results shown that the magnetic field may affect some samples significantly, and the influence obeys the same law for most the samples. A new attenuation peak appears with applied magnetic field, and the frequency of the attenuation peak increases linearly with the increase of the applied field.
1、研究了丝材长度、丝材含量、丝材取向、样品尺寸等丝材分布特性指标对含随机分布和含平行分布丝材复合膜噪声抑制特性的影响,找出了最优的丝材长度、丝材含量及丝材取向。结果还表明,样品垂直于微带线方向的尺寸大于等于50mm时,样品尺寸对噪声抑制特性的影响不大。
2、研究了去除玻璃层、热处理和丝材成分对含圆截面非晶细丝复合膜噪声抑制特性的影响,结果表明去除玻璃层和热处理可以改善复合膜的噪声抑制特性。含Fe基丝材复合膜与含CoFe基丝材复合膜,受随机分布丝材长度、平行分布丝材间隔等指标影响的规律相同。
3、由含量为30根/cm2、长l0mm随机分布的去除玻璃层后Fe基丝材开发出新型宽频噪声抑制材料,其功率损耗比在1.5GHz至8.5GHz频率范围内功率损耗比大于80%,对噪声的反射在4.8%以下,具有重要的实用价值。
4、研究了含玻璃包覆丝的“三明治”噪声抑制片的噪声抑制特性,发现添加随机分布丝材使复合噪声抑制片的高功率损耗频带宽度显著增大,此方法有调节和改善传统金属颗粒噪声抑制片性能的应用价值。
5、由间隔为lmm平行分布制备态Fe基丝材制备出具有高功率损耗特性的复合膜样品,功率损耗比在2.4GHz至8.5GHz频率范围内均大于92%,对噪声的反射在3%以下。
6、研究了磁场作用对含圆截面非晶细丝复合膜噪声抑制特性的影响,结果表明磁场对某些样品具有显著的影响,且磁场对大部分样品的影响规律相同：施加磁场后产生新的衰减峰,对应的频率随着磁场增大而线性或近似线性地增大。
With development of electronic products towards high-frequency, digital and miniature, portable, multifunctional, the operative frequency of many electronic products has got above GHz. The component density increases continually too, which incur serious electromagnetic interference. Using noise suppression sheet is an important countermeasure for the interference. High electromagnetic loss and high resistivity are primary requirements of noise suppression sheet. The composite containing glass-covered wires show both nature ferromagnetic resonance and dielectric loss in microwave frequency range. The glass-covered amorphous wires could be used to made composites with high resistivity for its high resistivity and insulating glass outlet. So the glass-covered amorphous wires are good candidate materials for noise suppression.
The goals of this thesis are to investigate noise suppression effect of composites containing circular cross-section amorphous microwires (glass-covered amorphous wires) and to develop novel broadband noise suppression materials. The thesis is organized as follow:
1、 The influence of distribution characteristics of the wires on the noise suppression effect of the composites containing random distributed or parallel distributed wires were investigated, in where the distribution characteristics include wire length, wire content, wire direction and sample size. The optical wire length, wire content and wire direction are founded out. The results show that the sample size influence noise suppression effect faintly when the sample size perpendicular to the microstrip is not less than50mm.
2、 The influence of glass-removal, anneal and the composition of the wire on the noise suppression effect of the composite films containing circular cross-section amorphous microwires was investigated. The results show that glass-removal and anneal may improve the noise suppression effect of the composite films. The composite film containing Fe-based wires depends on the length of random distributed wires and on the row distance between parallel distributed wires in the same way as the composite film containing CoFe-based wires.
3、 A novel broadband noise suppression material with important practical value was developed with random distributed Fe-base wires after glass-removal with the content of30pieces/cm2and with the length of10mm, which power loss was great than80%from1.5GHz to8.5GHz.The noise reflection due to the sample is below4.8%.
4、 The noise suppression effect of the "sandwich" noise suppression sheet containing glass-covered wires was investigated. It's shown that adding the random distributed wires led to obvious increase of the frequency band with high power loss. This method posse practical value for to adjust and to improve the performance of the traditional metal granular noise suppression sheet.
5、 A composite film with advantage of high power loss was fabricated with parallel distributed Fe-base wires with the row distance of lmm, which power loss was great than92%from2.4GHz to8.5GHz.The noise reflection due to the sample is below3%.
6、 The influence of magnetic field on noise suppression effect of the composites containing circular cross-section amorphous microwires was investigated. The results shown that the magnetic field may affect some samples significantly, and the influence obeys the same law for most the samples. A new attenuation peak appears with applied magnetic field, and the frequency of the attenuation peak increases linearly with the increase of the applied field.
引文
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