共查询到19条相似文献,搜索用时 343 毫秒
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提出并设计一种采用绝缘液体充填封装的RF MEMS开关,分析其工作原理,并以高压油、蓖麻油、甘油为绝缘液体充填封装,仿真分析绝缘液体对RF MEMS开关的驱动电压、冲击速度、响应时间、开关电容等方面的影响。结果表明:绝缘液体充填封装有效地将驱动电压降为原来的1/εr,降低上极板对下极板的冲击速度。对3种液态封装材料性能分析,蓖麻油效果最好:阈值电压下降了一半,约为10 V;当驱动电压为20 V时,响应时间为40.6μs,优于高压油(91.3μs)、甘油(89.9μs),冲击速度约为1.26 m/s。 相似文献
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利用RF MEMS可变电容作为频率调节元件,制备了中心频率为2 GHz的MEMS VCO器件.RF MEMS可变电容采用凹型结构,其控制极板与电容极板分离,并采用表面微机械工艺制造,在2 GHz时的Q值最高约为38.462.MEMS VCO的测试结果表明,偏离2.007 GHz的载波频率100kHz处的单边带相位噪声为-107 dBc/Hz,此相位噪声性能优于他们与90年代末国外同频率器件.并与采用GaAs超突变结变容二极管的VCO器件进行了比较,说明由于集成了RF MEMS可变电容,使得在RF MEMS可变电容的机械谐振频率近端时,MEMS VCO的相位噪声特性发生了改变. 相似文献
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Solid-based CAPP for surface micromachined MEMS devices 总被引:1,自引:0,他引:1
Process planning for a MEMS device is almost always conducted manually by the designer to date. As the structures of MEMS devices become more and more complicated, in order to release the designers from the hard and tedious work and speed up the development of MEMS products, such a situation should be changed. In this study, a solid based CAPP method for surface micromachined MEMS device is presented. With this method, a MEMS device is designed with a traditional CAD system, and its process planning is conducted automatically based on the solid model created. The process features with engineering semantics are extracted first. Then, the process layer model is constructed with each process layer of the model being coincident with the fabrication layer of surface micromachining. Finally, the masks are synthesized and the fabrication process is generated. Furthermore, to guarantee the manufacturability of the designed MEMS device, a systematic evaluation method is proposed. The proposed design and CAPP methods enable designers to concentrate on functional and shape design of MEMS devices. 相似文献
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Based on the multisplit-ring resonator (MSRR) with MEMS switches, a tunable metamaterial component is proposed in this paper
to realize multiband applications. Numerical simulations are carried out to verify the tunable capacity of the proposed structure.
The simulated results show that the resonance frequency of the metamaterial component shifts to higher frequencies when the
MEMS switches are at different states, and depends strongly on the place, state and microbeam height of MEMS switches. Moreover,
the large tunable range can be obtained by controlling the up state or down state of MEMS switches, while the small tunable
range can be obtained by controlling microbeam height of MEMS switches. That is, such controlling ways can realize both rough
and minor tunable metamaterial component. The tunable method proposed in this paper is of great practical values in designing
tunable metamaterial and negative refractive index material. 相似文献
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A MEMS reconfigurable defected-ground-structure (DGS) resonator using two-dimensional (2-D) periodic DGS for coplanar waveguide (CPW) transmission line and RF MEMS series-resistive switches is proposed. The introduced MEMS reconfigurable DGS resonator has approximately a fixed bandwidth of 8.1 GHz over a wideband frequency range (K-band). The proposed structure can be designed easily for other frequency bands by changing the number of unit-cells of the 2-D PDGS. A cascaded two parallel-resonance circuit model for the MEMS reconfigurable DGS resonator has been introduced as well. The equivalent circuit parameters extraction methods have also been derived. Simulations based on the proposed circuit model are in a very good agreement with the electromagnetic (EM) simulations, which suggests that the MEMS reconfigurable DGS resonator is an inductive controlled reconfigured structure. The structure is designed in CPW environment on a high-resistivity silicon substrate. It is therefore suitable for monolithic integration with standard IC process. 相似文献
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用于系统级仿真的MEMS器件宏模型研究现状 总被引:1,自引:0,他引:1
微机电系统(MEMS)的未来在于有稳定数量且不断壮大的新型产品能成功地转化为商品,这关键在于将计算机引入到MEMS设计、制造全过程。阐述了MEMS CAD的复杂性和困难。对MEMS CAD的分层设计思想作了简要介绍,着重对现有的MEMS器件宏模型的建模方法和模型的描述与其国内外研究现状与发展方向进行介绍和总结,认为宏模型研究的重点将是器件非线性特性的有效表达和建模过程自动化的计算机实现,并对今后的研究发展提出一些建议。 相似文献
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阈值去噪与RBF神经网络在MEMS陀螺仪误差补偿中的应用 总被引:1,自引:0,他引:1
针对现有MEMS陀螺仪中随机误差较大,导致器件输出信噪比低进而影响其应用范围的现状,提出一种基于小波阈值去噪与梯度径向基( RBF)神经网络结合的MEMS陀螺漂移非平稳时间序列建模预测方法。首先采用Allan方差法分析了MEMS陀螺仪的主要随机误差,随后利用小波阈值去噪分离出MEMS陀螺误差模型中的白噪声及漂移误差,最后采用RBF神经网络对漂移数据进行建模。通过实验对文中所述的误差补偿方法进行验证,表明了方法的有效性,对于基于MEMS陀螺仪的惯导系统精度提高具有重要意义。 相似文献
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提出了一种基于永磁薄膜的新型MEMS磁传感器,磁传感器由MEMS扭摆、CoNiMnP永磁薄膜和差分检测电容等部分组成。分析了磁传感器的磁敏感原理和电容检测原理,提出了器件的结构参数并对器件进行了模态仿真。利用MEMS加工技术成功制作了MEMS磁传感器样品,并进行了测试。测试结果表明:得到的MEMS磁传感器的电容灵敏度可达到27.7 fF/mT,且具有良好的线性度。根据现有的微小电容检测技术,传感器的磁场分辨率可达到36 nT。 相似文献
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Rumi Zhang Wei Wang Dounavis A. Jullien G.A. 《Journal of microelectromechanical systems》2008,17(3):678-687
In this paper, we present a passive reduced-order macromodeling algorithm for second-order dynamic systems of linear microelectromechanical systems (MEMS) devices. The proposed reduction algorithm is based on congruent transformations. The system equations of MEMS devices, given by finite-element methods (FEMs), are converted to state-space forms that are compatible with passive Krylov subspace methods. To achieve this, a modified matrix equation is proposed for second-order MEMS dynamics. In addition, the generalized procedure is provided for first-order heat transfer problems and second-order structure dynamic problems to ensure that the discretized FEM system satisfies all the necessary conditions to guarantee the passivity of the reduced-order system. Finally, numerical examples are provided to demonstrate the validity of the proposed passive reduction technique. 相似文献
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小波阈值去噪和FAR建模结合的MEMS陀螺数据处理方法 总被引:1,自引:1,他引:0
为解决MEMS陀螺输出信号中噪声大、随机漂移严重的问题,提出了一种小波阈值去噪和函数系数自回归FAR建模结合的MEMS陀螺数据处理方法。采用小波阈值去噪法对MEMS陀螺输出信号去噪,提高其信噪比;为克服常用的自回归AR模型无法解决MEMS陀螺随机漂移存在的非线性问题,引入FAR模型对MEMS陀螺的随机漂移进行建模。实验结果表明,此数据处理方法可有效抑制MEMS陀螺输出噪声,且与AR模型相比,FAR模型能更精确地对MEMS陀螺随机漂移进行建模及预测。 相似文献
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基于MEMS技术生产的MEMS器件,具有体积小、重量轻、成本低、耐冲击性、高可靠性等特点,它被广泛应用于动态水平测量装置当中。但是由于外界环境的干扰,MEMS器件的测量精度一直难以达到实际应用水平。分析了在动态水平测量当中影响MEMS器件测量精度的各种因素之后,提出了一种基于ARMA模型的针对MEMS陀螺器件随机误差补偿的改进型算法。以某型号的陀螺的随机误差为研究对象进行实验验证,结果表明,MEMS陀螺的测量精度在滤波之后有了明显的提高。经过改进后的卡尔曼滤波器和引入自适应渐消因子的卡尔曼滤波器,在静态环境下,它们的误差标准差分别降为原始误差的3.75%和4.8%,动态环境下的滤波精度也得到有效提高。证明该方法是可行的和有效的,具有较大的工程实践意义。 相似文献