大功率高原型发射机的设计

结合某高原型雷达发射机的研制和实践,介绍了一种具备5 000 m 高原工作能力的大功率速调管发射机的设计。给出了系统方案,重点介绍了固态调制器、高压绝缘、快速电弧保护电路、速调管打火保护等关键技术。所设计的发射机具有体积小、效率高、维修性好等特点。实践表明:该发射机的环境适应性和可靠性满足设计指标要求。     

新一代高功率发射机的研制

为满足现代雷达对发射机的要求,研制了新一代高功率发射机。介绍了小型高功率发射机的技术体制、主要特点、系统组成和关键技术。发射机采用模块化高压电源、新体制固态刚管调制器以及一体化结构设计等技术。针对高功率发射机的设计难点给出了具体的解决方案。实践表明:采用新型技术,提高了发射机的平台适应性、可靠性及效率。     

毫秒级宽脉冲速调管发射机研究

介绍了一种毫秒级宽脉冲速调管发射机的系统组成及关键技术。根据国内外技术发展的现状及靶场测量雷达的要求,确定了发射机的系统设计方案。分析了调制组件输出叠加方案的调制器及绝缘栅双极型晶体管串接方案调制器的优缺点。论述了BOUNCER 补偿电路和多路电源分时补偿电路的原理,给出了仿真数据及测试结果,同时对两种发射机输出脉冲顶降补偿方案的优缺点进行了对比分析。最后对研制成功的毫秒级宽脉冲发射机进行了测试,测试结果表明:输出功率、波形、频谱均达到了设计指标的要求。     

基于超高峰值功率发射机技术的微波源研究

为满足更大功率的微波源系统需求,提出了基于超高峰值功率发射机技术的微波源方案。建立了一个200MW 级高功率微波源验证系统,突破了65MW 级高功率速调管发射机小型化设计、200MW 级功率压缩、超大功率相控阵天线和超高峰值功率发射机监控与抗干扰等关键技术,为高功率微波源技术的研究提供了一种新的途径。介绍了微波源的应用现状和特点,阐述了微波源系统的组成、关键技术和具体的解决方案。详细介绍了超大功率发射机改进型调制器的设计,给出了脉冲变压器的仿真波形和电缆的高压电磁特性仿真图。最后对三种微波源方案进行了比较,给出了微波源系统工程化运用的改进建议。     

S波段大功率宽带速调管车载发射机的设计

车载雷达对发射机的体积、重量和环境适应性提出了严格要求.文中介绍了一种具有较强环境适应性的大功率宽带速调管车载发射机的设计,叙述了发射机的主要技术指标和系统组成.重点介绍了高压电源、固态调制器、结构与冷却和宽温下带内输出功率的稳定性.最后,展望了多注速调管在大功率发射机中的应用前景.     

一种C波段宽带速调管发射机的设计

介绍了一种C波段宽带速调管发射机的设计,叙述了发射机的组成形式并给出其主要性能指标,重点介绍宽带速调管、回扫电源技术、固态调制器,解决了等激励条件下速调管输出功率起伏较大及散热问题。     

固态调制器应用实践

简述固态调制器的组成原理和设计难点，以20kV／50A的固态调制器为例，给出了该调制器的实验数据。结合具体项目，详细论述了该调制器用于多注速调管发射机的试验结果以及该系统的测试波形，肯定了固态调制器在工程上的应用价值。     

110kHz高重频多注速调管发射机

通过某110 kHz高功率多注速调管发射机的研制介绍了高重频发射机的设计要点,重点介绍了一种采用IGBT开关管串联组成的高重频高压固态浮动板调制器的设计,对调制器的电路组成和为实现高重频所采取的关键技术进行了简要的介绍,对发射机的主要组成、高压电源和撬棒保护电路等也进行了简要的介绍。试验结果表明,采用固态开关串联完全可取代传统的真空管开关,在高重频的大功率雷达发射机中稳定可靠工作。     

大功率多注速调管发射机的小型化设计

车载和大功率机载雷达对真空管发射机的体积和质量提出了严格要求,发射机的小型化很有必要。文中介绍了一种大功率多注速调管发射机的小型化设计,叙述了发射机的主要技术指标和系统组成;阐述了高功率密度高压电源、小型化固态调制器、高压一体化设计和末级组件热设计等发射机小型化关键技术。实验表明:小型化发射机达到预期设计要求。文中对该小型化发射机的实际应用情况和使用前景进行了介绍。     

大功率速调管发射机升级设计与实现

介绍了最新研制的S 波段大功率速调管发射机的升级设计方案及关键技术。阐述了技术先进的高压电源、小型化全固态调制器和一体化高压油箱设计。升级设计方案合理解决了高压传输,发射机设备量比原设计约减少二分之一。调制器组件和高压电源组件采用模块化冗余设计,提升了发射机的可靠性。阐述了基于PXI 平台和虚拟仪器的指标自动化测试和故障智能诊断技术在发射机控制保护中的应用。实践表明:发射机升级设计使性能指标得到提升,整机体积小、效率高,安全性、智能化程度高。最后,提出了对大功率速调管发射机技术发展的一些思考。     

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.     

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.     

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.     

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