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开口同轴探头测量微波集成电路基片的复介电常数 被引量:5
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作者 张 思 钮茂德 徐得名 《微波学报》 CSCD 北大核心 2002年第1期57-63,共7页
本文论述了开口同轴(无外加法兰)非破坏测量微波集成电路基片复介电常数的方法。文中阐明了开口同轴FDTD法的建模与测量原理。由于FDTD法建模是一种全波分析方法,出此该模型相当准确。在S和X波段测量了聚四氟乙烯材料和另一种介质基... 本文论述了开口同轴(无外加法兰)非破坏测量微波集成电路基片复介电常数的方法。文中阐明了开口同轴FDTD法的建模与测量原理。由于FDTD法建模是一种全波分析方法,出此该模型相当准确。在S和X波段测量了聚四氟乙烯材料和另一种介质基片的复介电常数,所得结果与它们的典型值非常吻合。开口同轴法测量具有非破坏性,适于现场测量,而且具有设备简单、操作方便、测量精度高等优点。 展开更多
关键词 开口同轴法 微波集成电路基片 非破坏测量 介电常数
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高功率MPCVD金刚石膜透波窗口材料制备研究 被引量:10
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作者 于盛旺 刘艳青 +3 位作者 唐伟忠 申艳艳 贺志勇 唐宾 《人工晶体学报》 EI CAS CSCD 北大核心 2012年第4期896-899,共4页
使用自行研制的椭球谐振腔式MPCVD装置,以H2-CH4为气源,在沉积功率8 kW条件下,对大面积金刚石膜透波窗口材料进行了制备研究。分别使用扫描电镜、Raman、分光光谱仪、热导率测试仪和空腔谐振法对金刚石膜的表面形貌、品质、光透过率、... 使用自行研制的椭球谐振腔式MPCVD装置,以H2-CH4为气源,在沉积功率8 kW条件下,对大面积金刚石膜透波窗口材料进行了制备研究。分别使用扫描电镜、Raman、分光光谱仪、热导率测试仪和空腔谐振法对金刚石膜的表面形貌、品质、光透过率、热导率和微波复介电常数等进行了表征及测试。实验结果表明,使用自行研制的椭球谐振腔式MPCVD装置,能够满足较高功率下高品质金刚石膜的快速沉积;抛光后的自支撑金刚石膜具有高的光学透过率和热导率,在23~36 GHz频率范围内微波介电损耗小于1×10-4,有着良好的微波介电性能,是较为理想的透波窗口材料。 展开更多
关键词 金刚石膜 MPCVD 微波复介电常数 透波窗口材料
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Infrared emissivity and microwave absorbing property of epoxy-polyurethane/annealed carbonyl iron composites coatings 被引量:5
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作者 CHEN YanPeng XU GuoYue +1 位作者 GUO TengChao ZHOU Ning 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期623-628,共6页
The microwave absorption property and infrared emissivity have been investigated for the single-layer coating made of the epoxy-polyurethane resin and carbonyl iron powders with variation of annealing treatment. Micro... The microwave absorption property and infrared emissivity have been investigated for the single-layer coating made of the epoxy-polyurethane resin and carbonyl iron powders with variation of annealing treatment. Microwave-absorbing property was investigated by measuring the complex permittivity and complex permeability of the absorber in the frequency range from 2 to 18 GHz. Infrared emissivity value was measured using IR-2 Infrared Emissometer in the wavelength range of 8-14 μm. After annealing, the Fe (110) peak became sharp, and the crystallization improved significantly. Annealing treatment could reduce the sttrface energy of powders, improve compatibility between fillers and adhesives, and result in increase of the density of the coating. The lowest value of infrared emissivity (0.419) was obtained from the coating made of the carbonyl iron powder annealed at 700℃ for 1 h. With the variation of the annealing temperature, the magnetic and dielectric properties of the carbonyl iron particle were changed. The maximum reflection loss decreased and the matching frequency shifted to lower frequency with increasing the annealing temperature of carbonyl iron particles, which coincided with the variation of the complex permeability and permittivity according to the annealing temperature. Magnetic loss factor and dielectric loss factor of carbonyl iron particles were improved with increasing the annealing temperature in the 2-18 GHz range. 展开更多
关键词 carbonyl iron infrared emissivity microwave absorbing property annealing treatment
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