共查询到20条相似文献,搜索用时 320 毫秒
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硅铝合金以其重量轻、高热导率以及可调节热膨胀系数(CTE)的优越综合性能,在电子产品特别是微波组件中得到越来越广泛的应用.利用ANSYS软件系统地对Si50Al合金和硬铝合金进行热和结构静力分析,结果表明Si50Al合金具有更好的力学性能.通过对Si50Al合金进行热膨胀系数测试和焊接应力分析显示,Si50Al合金与Al203基陶瓷基板有较好的热匹配.机械加工、表面镀覆、元器件装联和密封实验表明,Si50Al合金完全可以替代硬铝合金、铜等作为微波组件的封装壳体和芯片载体材料,其与陶瓷基板和GaAs等半导体芯片衬底材料热膨胀匹配性好,并可成功地应用于高可靠微波模块电路的封装. 相似文献
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电子设备的封装结构多采用层状排布,封装方式多采用焊接工艺,因此封装体中的电子元件失效形式大多是由于各层封装材料热膨胀性能不匹配,导致开、断开关时焊接点脱落或开裂,进而导致硅芯片工作热量不能通过散热基板扩散至电子设备之外,芯片因工作温度过高而失效。运用ANSYS热分析软件对电子封装结构进行热应力分析发现,温度变化对焊料的脱落、开裂造成显著影响。根据热分析结果,提出有关焊料厚度及封装材料性能的改进意见,这样既节约实验成本,又能有效缩短研究电子封装可靠性及电子设备使用寿命的时间。 相似文献
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文章介绍了日立化成PCB用基板材料的发展路线,分析了日立化成最新推出的薄封装基板用环境友好低热膨胀材料MCL—E-679GT的材料设计和日立化成的填料界面控制系统,综述了MCL-E-679GT的性能特点。 相似文献
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介绍了一种基于LTCC基板的K频段多通道发射组件。为了更好地满足散热要求,盒体采用了高导热率的无氧铜材料。针对无氧铜盒体与LTCC基板间热膨胀系数的差异,提出了一种将LTCC基板过渡到钼铜载体,再将钼铜载体烧焊到无氧铜盒体的工艺流程。组件有8个通道,各路通道输出功率为25dBm,具有6位移相、5位衰减。研制结果表明组件性能优越、尺寸小、散热好,在高温85℃条件下工作时可以保证壳温≤90℃,长期工作可靠性高。 相似文献
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该文基于宽频枝节匹配方法提出了一种双通带薄膜体声波谐振器(FBAR)滤波器设计方法。基于S参数网络阻抗变换理论分析了滤波网络输入和输出端宽频匹配原理,设计对应于两个不同频带FBAR滤波器的阻抗匹配枝节,进而通过公共端的连接实现双通带FBAR滤波器的设计。匹配网络采用电容和电感可在基板上进行准确设计,并通过在此基板上完成FBAR滤波器的装配实现双通带滤波器的整体集成。最终设计了一种中心频率分别为2 492 MHz和6 000 MHz的双通带滤波器。结果表明,两个通带的插入损耗分别为3.29 dB和4.91 dB,阻带抑制均小于-25 dB,与理论设计结果匹配较好。 相似文献
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为了研究不同封装条件对低温共烧陶瓷(LTCC)基板封装焊接后残余热应力的影响,该文针对不同温变载荷下LTCC基板的热应力变形进行了仿真计算和实验测试,结果显示仿真计算与实验测试结果具有较好的一致性,验证了数值仿真用于LTCC基板封装焊接后残余热应力仿真的可行性。在此基础上对零膨胀合金底板和硅铝合金封装条件下3种典型工作温度对应的LTCC基板的热应力进行了仿真计算。结果表明,封装焊接后LTCC基板两侧边缘应力集中,中间残余应力小,呈翘曲状态,采用硅铝合金封装焊接的热应力小于零膨胀合金封装。 相似文献
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R. Liu D. Schreurs W. De Raedt F. Vanaverbeke J. Das R. Mertens I. De Wolf 《Microelectronics Reliability》2011,51(9-11):1721-1724
In this work, the degradation of a GaN power amplifier (PA) integrated in a thin film multi-chip module (MCM-D) interconnect technology is investigated by means of DC and RF measurements. Failure analysis has demonstrated that improper thermal contact may cause the PA module performance degradation. Moreover, we have experimentally studied the thermal effects on the RF performance of MCM-D and low-temperature co-fired ceramic (LTCC) PAs. It shows that the device exhibits a higher output power density on a thinned MCM-D substrate than on an LTCC substrate with thermal vias, and also that the output power density can be further improved by reducing the heat spread distance between active devices and heat sink. 相似文献
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Kula J.S. Psychoudakis D. Liao W.-J. Chen C.-C. Volakis J.L. Halloran J.W. 《Antennas and Propagation Magazine, IEEE》2006,48(6):13-20
The recent availability of high-contrast, low-loss ceramic materials provides us with possibilities for significant antenna miniaturization. This paper explores the use of low-temperature co-fired-ceramic (LTCC) substrates in producing a miniaturized patch-antenna design. Of particular interest in the design are parameters such as substrate thickness, input impedance, radiation efficiency, and bandwidth due to the high-contrast ceramic. We propose a thick substrate to increase bandwidth. However, the substrate is truncated to mitigate surface-wave loss, with possible texture to provide dielectric-constant control for improved impedance matching. Utilizing these proposed design modifications, a miniaturization factor of more than eight was achieved, with a return-loss half-power bandwidth greater than 9%. Moreover, respectable gain was maintained, given the achieved miniaturization 相似文献
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An integrated balanced matching circuit embedded in an LTCC package is presented. An analytic design equation is derived and used to implement the proposed structure using the LTCC process. Measured characteristics show good agreement with theoretical calculation 相似文献
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The RF SiP module based on LTCC substrate has attracted considerable attention in wireless communications for the last two decades. However, the thermo-mechanical reliability of this 3D LTCC architecture has not been well-studied as common as its traditional ceramic package structure. A practical RF SiP module based on LTCC substrate was presented and its thermo-mechanical reliability was analyzed in this paper, with emphasis on the reliability of heat reflow process, the operating state and fatigue of second-level solder joints. The configuration and assembly process of the SiP module were briefly introduced at first, and qualitative analysis was made according to the reliability problem that may occur in the manufacturing process and the operating state. Through FEM simulation, this paper studied the warpage and stress variation of the RF SiP module, as well as parametric studies of some key package dimensions. Solder joint reliability under temperature cycling condition was also analyzed in particular in this paper. The results show that for the heat reflow process and operating state, the maximum warpage is both on the top LTCC substrate, but the maximum stresses are on the outermost solder ball and the kovar column at the corner, respectively. There is a large residual stress on the critical solder ball at the end of the reflow process and the key package dimensions has little effect on it. The thickness of top LTCC substrate has a significant impact on the thermal deformation and thermal stress, followed by the height of kovar columns. The reason for the considerable thermal stress on the kovar column is the non-uniform of temperature distribution. The key to reducing thermal deformation and stress in the operating state is the employment of effective cooling measures. It is found by comparison that the reliability of critical solder joints can be greatly improved by adding suitable underfill. 相似文献