Robust filtering for discrete time piecewise impulsive systems

This paper investigates the filtering problems for the discrete time piecewise impulsive system. First, the robust H_∞ filtering problem and generalized H₂ filtering problem for the discrete time piecewise impulsive system are introduced. Then, linear matrix inequality (LMI) conditions are proposed for the design of H_∞ and generalized H₂ filters such that the resulting discrete time piecewise impulsive filtering error system is globally stable with guaranteed H_∞ or H₂ performance. Finally, a numerical simulation is also given to illustrate the effectiveness of the proposed approaches.     

利用维纳滤波改善声透镜光声成像系统的分辨率

为了克服衍射效应对光声成像系统分辨率的限制,需要采用逆卷积方法进行图像反演.从理论上分析了声透镜成像原理,模拟仿真了声透镜的点扩展函数对声透镜成像系统分辨率的影响和维纳滤波解卷积方法复原光声成像的过程,并利用自搭建的声透镜光声成像系统进行了深入的实验研究,得到了物平面上相距4 mm和3 mm的两个黑胶带点的直接成像光声...     

A nanometric plasmonic waveguide filter based on Fabry-Perot resonator

A compact nanometric surface plasmon polariton Fabry-Perot filter based on three metal-insulator-metal (MIM) waveguides is proposed and studied. The characteristics of this SPP band pass filter are analyzed by the finite difference time domain method and the Fabry-Perot resonance model. The results show that the resonance wavelengths of the pass bands can be linearly changed by the resonant cavity length, and the transmission ratios of the pass bands can be varied by altering the gaps between the MIM waveguides. The metal loss and dispersion effects on the SPP filter's spectra are considered as well. This kind of simple filter is very promising for high density SPP waveguide integrations.     

Micro-disks embedded microring for optical filter

We propose a novel ultra compact structure of micro-disks embedded microring filter (MDEMR) and several parameters which impact the performance of MDEMR are analyzed. The filter is shown to exhibit much smaller size and better spectrum than traditional microring one. The number and radius of the inner disks are found to mainly influence the resonance frequency of the micro-disks, and the valley of transmittivity. The resonance between microring and micro-disks is decrease with increasing the gap between microring and micro-disks, which also leads to the extinction ratio improved significantly. The Q factor is found to be improved from 300 to 3000 with the gap increased from 0.2 μm to 0.4 μm, while the transmission peak affected slightly.     

Reconstruction of band-limited signals from multichannel and periodic nonuniform samples in the linear canonical transform domain

Linear canonical transforms (LCTs) are a family of integral transforms with wide application in optical, acoustical, electromagnetic, and other wave propagation problems. This paper addresses the problem of signal reconstruction from multichannel and periodic nonuniform samples in the LCT domain. Firstly, the multichannel sampling theorem (MST) for band-limited signals with the LCT is proposed based on multichannel system equations, which is the generalization of the well-known sampling theorem for the LCT. We consider the problem of reconstructing the signal from its samples which are acquired using a multichannel sampling scheme. For this purpose, we propose two alternatives. The first scheme is based on the conventional Fourier series and inverse LCT operation. The second is based on the conventional Fourier series and inverse Fourier transform (FT) operation. Moreover, the classical Papoulis MST in FT domain is shown to be special case of the achieved results. Since the periodic nonuniformly sampled signal in the LCT has valuable applications, the reconstruction expression for the periodic nonuniformly sampled signal has been then obtained by using the derived MST and the specific space-shifting property of the LCT. Last, the potential applications of the MST are presented to show the advantage of the theory.     

超导滤波器制作与可靠性初步试验

介绍了高温超导滤波器薄膜电极与同轴转接器用金带连接技术,得到了较高的性能指标,所制作滤波器带内回波损耗<-21dB.并将金带连接效果的仿真指标与实测结果作了对比,指标一致性较好.所制超导滤波器顺利通过振动冲击试验,表明器件具备一定的可靠性.     

在光阻材料中过滤器吸附机制的作用(英文)

近来尼龙过滤被广泛用于光刻工艺流程来改善良率,因为许多IC和光阻制造商有实验性证据表明尼龙滤膜能吸附杂质。然而,尼龙滤膜降低缺陷的机制尚不清楚。通过致力于特定的光阻成分来研究不同的缺陷发生机制是十分有用的。利用表面改性和不同的光阻成分进行了各种吸附试验来测量尼龙滤膜的耐受性,包括表面张力,光酸发生剂和光酸抑制剂。最后,研究希望通过致力于如何最佳贯彻尼龙过滤策略来确定最有效的方法提高良率。     

The Analysis of the Parameters and the Functions of Rectangular Waveguide E-plane Filter

In this paper, to analyze the discontinuity structure of E-plane metal insert by mode matching method, and metal insert thickness and resonator length impact on filter design. This work was supported by the Natural Science Foundation of Jiangsu Province of China under Grant No. BK2008357.     

Arbitrary real-order cost functions for signals and systems

This work focuses on a new type of cost function based on fractional operators. To do so, the concept of definite integral is extended to arbitrary real-order. Some properties of this new fractional-order definite integral are studied and a fractional-order Barrow's rule is proposed. It is illustrated by an example (the design of an IIR filter) how this new kind of cost function can be a valuable tool in problems where optimal design methods are involved.     

电磁兼容技术在汽车嵌总线中的应用

用电磁兼容的设计理论分析了汽车中电子设备受电磁干扰的现象及危害性，对汽车嵌总线系统的PCB 板、总线进行了电磁兼容设计，并提出新的滤波电路及连接方法，能解决汽车嵌总线系统的抗干扰问题，达到良好的效果。