雷达吸波材料反射波极化特性分析

极化特性是综合评价雷达吸波材料的一个重要标准，文章从多层雷达吸波材料的反射系数公式出发，研究了多层雷达吸波材料反射波的极化特性；然后重点研究了入射波为圆极化波时反射波的极化特性，对于雷达吸波材料的设计具有指导意义。     

新型雷达波吸收材料导电聚合物的研究

介绍了新型雷达波吸收材料导电聚合物的研究现状及发展趋势，导电聚合物吸波剂在众多雷达波吸波剂分类中所属类型，导电聚合物的导电机理，提出了在进一步研究中，导电聚合物更好地应用于雷达吸波材料所要考虑的问题．     

雷达吸波材料与吸波结构

介绍了隐身技术中雷达吸波材料与吸波结构的基础技术和它们所存在的主要问题，以及近年来对导电聚合体、铁氧体吸波材料等的研究情况。关于雷达吸波材料对冲激雷达辐射的有效性也作了初步论述。     

雷达总论、雷达理论与技术

0609575吸波材料在飞行器隐身设计中的应用研究〔刊,中〕/王明亮//航空计算技术.—2005,35(4).—45-49(L)基于多目标优化理论,提出雷达吸波材料在物体表面涂敷位置的优化设计方法。利用电磁波的干涉原理和材料的吸波性能,通过设计吸波材料在飞行器表面的涂敷位置,研究局部涂敷吸波材料所能获得的隐身效果。以某飞行器模型为例开展吸波材料隐身技术研究,实现了雷达散射截面减缩与材料增重之间的优化与折衷。参50609576海杂波背景下基于RBF神经网络的目标检测〔刊,中〕/陈瑛//雷达科学与技术.—2005,3(5).—271-275(D)0609577动目标检测、定…     

超宽带宽角极化不敏感的电路模拟吸波材料设计

传统的电路模拟吸波材料设计只考虑正入射时的吸波性能,当入射角较大,尤其是大于30°时,雷达吸波器的吸波效果明显恶化。随着现代双站雷达探测技术的发展,雷达探测电磁波可能来自不同的空间方向,这就要求雷达吸波材料不仅在电磁波正入射时具有较高的吸波性能,在斜入射时同样实现良好的隐身特性。为此,该文提出了一种新型的宽带吸波材料。...     

雷达吸波材料的涂层结构设计

雷达吸波涂料要达到理想的吸波效果,除选用合适的吸波材料外,还必须具有完美的结构设计。详细介绍了雷达吸波涂层中的吸收型（单层型和多层型）、干涉型、谐振型等涂层结构的选材、设计、特点、应用范围等,为研制新型高性能的吸波材料提供了理论基础。     

单层雷达吸波涂层电磁参量匹配解析式的推导及其应用

从电磁场理论出发,严格推导了单层雷达吸波涂层的等效表面阻抗公式,得出了单层雷达吸波涂层反射系数的计算公式,在此基础上推导了基底材料为金属体时单层雷达吸波涂层的两条设计原则,得出了电磁参量的匹配解析式,最后讨论了这两条设计原则的应用.     

新型仿形多频谱复合伪装材料的研究

为满足信息化作战条件下多频谱兼容伪装的需求,采用多种材料合理匹配与多功能层结构组合的方法,研制了一种可见光、红外和雷达多频谱兼容的新型仿形复合伪装材料,研究了吸波材料中碳含量与铁含量的质量比对雷达波吸波性能的影响.采用雷达波屏蔽效能和反射率实验测试了伪装材料的吸波性能,采用成像法检测了伪装材料的可见光和热红外伪装性能....     

电磁防护材料专题

题目：新型吸波碳纤维的研究进展 作者：谢炜、程海峰、楚增勇、陈朝辉 摘要：碳纤维吸波材料是一类多功能复合材料，具有承载和减小雷达反射截面的双重功能，是一种非常有发展前途的吸波材料。分别详细介绍了螺旋碳纤维、改性碳纤维、异形碳纤维和纳米碳纤维等新型碳纤维的制备、吸波机理及吸波性能，并对其最新研究现状进行了评述。     

网格化处理对隔磁片雷达频段吸波特性的影响

通过对0.1 mm厚的隔磁片进行网格化处理,制备隔磁片材料的周期结构,研究了网格尺寸、隔磁片磁导率对雷达频段吸波性能的影响.结果表明,网格化处理显著提高了隔磁片在雷达频段的吸波性能,材料原始状态的吸波性能越好,网格化处理后的吸波性能提升越高,而隔磁片磁导率并未呈现对雷达频段吸波性能的正相关影响规律.经10 mm方格化处理,磁导率30、80的隔磁片具有优异的Ku波段吸波性能;磁导率120的隔磁片,具有优异的8～18 GHz宽频带吸波性能,优于相同厚度的雷达吸波涂层,具有较强的工程应用价值.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks