AlN–SiC复合材料在1–100 GHz微波频率范围内的复介电常数

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS Powder Metallurgy and Metal Ceramics Pub Date : 2023-10-17 DOI:10.1007/s11106-023-00370-9
V. I. Chasnyk, D. V. Chasnyk, O. M. Kaidash
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引用次数: 0

摘要

在1–100 GHz的频率范围内,表征了碳化硅含量在20%至50%范围内的AlN–SiC复合材料中复介电常数的实部和虚部的相关性。SiC颗粒的平均尺寸分别为0.8和2.3μm。随着频率从1 GHz增加到100 GHz,总体趋势显示实部ε′的持续下降与频率提高到1/5功率成反比。当频率从1到3 GHz时,虚部ε〃首先与提高到1/2功率的频率成正比增加,在6–8 GHz范围内达到最大值,然后在大于8 GHz的频率下与提高到1/5功率的频率呈反比单调减小。在整个频率范围内,发现ε′和ε〃与频率有关。然而,在8GHz以上的频率下,ε〃/ε′=tgδ比率保持不变,与频率无关。提出了这些依赖关系的解析表达式,允许在该范围内的任何频率下计算ε′和ε〃。为了绘制这些依赖关系,应该获得至少一个具有可靠ε′和ε〃值的实验数据点,最好在2到5GHz之间。这对ε〃特别重要,因为它在1–10 GHz频率范围内变化独特。为了指定频率低于8GHz时的ε〃值,提出了两种方法。第一种方法使用ε〃的内切圆的几何结构作为频率的函数,能够在4–8 GHz频率范围内快速测定含有20至50%SiC的AlN–SiC复合材料的ε〃。与真实ε〃的最大偏差不超过3%。第二种方法涉及计算的抛物线,也内接在ε〃的频率相关性中。在6–8 GHz范围内,SiC含量低于40%时,ε〃的偏差不超过3%。
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Complex Permittivity in the AlN–SiC Composite in the 1–100 GHz Microwave Frequency Range

The dependences of the real and imaginary parts of complex permittivity in AlN–SiC composites, with a silicon carbide content ranging from 20 to 50%, are characterized over a frequency range of 1–100 GHz. The SiC particles have average sizes of 0.8 and 2.3 μm. As the frequency increases from 1 to 100 GHz, the general trend shows a consistent decrease in the real part ε′ in inverse proportion to the frequency raised to the 1/5 power. The imaginary part ε″ first increases in direct proportion to the frequency raised to the 1/2 power when the frequency raises from 1 to 3 GHz, reaches its maximum in the 6–8 GHz range, and then monotonically decreases in inverse proportion to the frequency raised to the 1/5 power at frequencies greater than 8 GHz. Throughout the entire frequency range, ε′ and ε″ are found to be frequency-dependent. However, at frequencies above 8 GHz, the ε″ / ε′ = tgδ ratio remains constant and is not frequency-dependent. Analytical expressions are proposed for these dependences, allowing ε′ and ε″ to be calculated at any frequency within this range. To plot these dependencies, at least one experimental data point with reliable ε′ and ε″ values should be obtained, preferably between 2 and 5 GHz. This is particularly important for ε″, as it changes uniquely over the 1–10 GHz frequency range. To specify ε″ values at frequencies below 8 GHz, two methods are proposed. The first method employs geometric construction of the inscribed circle for ε″ as a function of frequency, enabling rapid determination of ε″ in the 4–8 GHz frequency range for AlN–SiC composites containing 20 to 50% SiC. The maximum deviation from true ε″ does not exceed 3%. The second method involves calculated parabolas, also inscribed in the frequency dependence of ε″. Over the 6–8 GHz range, the deviation of ε″ does not exceed 3% for SiC contents below 40%.

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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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