S波段高功率速调管发射机的设计

介绍了一种S波段高功率单注速调管发射机,叙述了发射机的组成形式并给出了其主要性能指标。重点介绍了该雷达发射机所采用的高可靠组合式固态调制器技术、大功率高稳定度集中式高压电源技术、大功率高压电源软启动技术、高压大功率固态反馈式de-Q稳幅技术、高压大功率集中式固态充电开关技术以及完备的监控保护、大电流回路的走线和结构设计等,最后展望了它广阔的应用前景。     

S 波段星载SAR 集中式固态发射机系统设计

该文介绍了某S 波段星载SAR 集中式固态发射机的系统设计,对星载应用中需要解决的高可靠性、环境适应性及结构小型化设计等系列关键技术进行分析和论述,通过了各阶段的相关试验验证。该固态发射机通过采用多路功率合成技术,实现输出峰值功率大于3 kW。由于其高效率、轻小型化、大功率等特点特别适用于小卫星平台。      

新型固态发射机结构设计

介绍了某高机动雷达集中式固态发射机的新型结构，整个发射设备集成安装于一只方舱内，功放组件和开关电源分机共用静压箱，只要一只风机供风，首次设计应用矩形分配器和合成器。分析了整机结构、安装和连结、冷却设计以及主要分机结构设计特点。该新型结构设计精简了发射机结构，操作维护方便，节省了开机时间，提高了发射机性能。论文最后提出了固态发射机的结构研究方向。对固态发射机设计研究具有一定的参考价值。     

L波段90kW固态发射机的设计

介绍了某雷达集中式大功率固态发射机功放组件、功率分配／合成器、电源系统、控制监控单元、结构冷却系统的设计,分析了电路对称性对发射机合成效率的影响。     

几种限制固态微波功率放大器最大输出的方法

随着微波大功率固体器件的飞速发展,越来越多的雷达发射机采用了固态放大器作为功率合成的子单元。目前不论在相控阵雷达发射系统还是在集中式雷达发射系统中都使用了固态发射机。在固态雷达发射机的放大链中即有多级放大的问题,也有多路功率分配与合成的问题。在比较大型的相控阵雷达发射系统中,阵面单元多达几百个甚至     

一种S波段固态发射机的设计

介绍一种S波段固态发射机的设计,本发射机是脉冲工作,空间合成式,输出脉冲功率8Kw,工作比为10%.     

S波段高可靠固态发射机设计

介绍了一种S波段集中式全固态雷达发射机,发射机设计采用前级组件及发射监控热备份技术,能在发热达到一定温度时,或其他故障发生时进行前级组件自动切换。发射机同时应用了开关电源和强迫风冷结构,性能优良,大幅提高了发射机使用可靠性。经实际测试,发射机输出功率＞15 kW,瞬时带宽40 MHz,发射脉宽100 μS,工作比8%,已连续工作5 000 h无故障。     

一种空管S波段30 kW固态发射机的设计

介绍了一种S波段30 kW空管雷达固态发射机的性能指标,阐述了发射机射频链路、监控保护、电源和冷却各部分的设计特点和实现方法;其次,针对空管雷达发射机的特殊需求,描述了在线更换技术和数字化检测技术;最后给出了发射机性能测试结果.本发射机的成功研制,可为今后其他固态发射机设计提供参考.     

固态发射机热设计与飞行验证

大功率高热流密度固态发射机是环境一号C 卫星有效载荷中的关键设备,对整星的热设计影响很大。固态发射机热设计的目的,是满足固态发射机的温度需要,从而确保固态发射机的安全可靠工作。该文论述了环境一号C 卫星固态发射机热控设计及解决的关键问题。飞行遥测结果表明,固态发射机热控设计正确、方案合理,很好地满足了固态发射机的温度要求。      

星载高功率固态功放关键技术与实验研究

该文结合某星载集中式固态发射机的高功率固态功率放大器,从星载应用着手,重点从高功率密度热设计、微放电防护设计、电磁兼容性设计等方面介绍了星载高功率固态功放关键性技术的设计方法,并且通过相关的真空环境试验验证了功率放大器组件设计方法的正确性和真空环境适应性。      

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.     

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.     

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.     

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.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.