一种Ka频段“瓦式”有源相控阵天线设计

在Ka频段,由于单元间距小和集成度高,采用"瓦式"结构集成,有源相控阵天线设计难度大。提出一种Ka频段"瓦式"有源相控阵天线设计方法。采用多功能集成芯片技术实现"瓦式"TR组件的设计,"瓦式"有源相控阵天线的整体架构采用模块化设计。最后设计了一种电控扫描的有源相控天线,采用软件仿真和数值分析设计,加工制造原理样机,测试性能指标,验证了提出方法的可行性。     

L频段共形相控阵天线研制

为满足机载系统的需要,给出了共形相控阵天线的分析和设计过程,同时研制了一种高度仅为0.14波长的准八木天线单元。利用三维电磁仿真软件HFSS对天线单元和共形相控阵进行了仿真设计,并研制了一套L频段共形相控阵天线。该天线由天线阵面、波束形成网络和波控器等构成。天线阵面由4个天线单元组成,共形安装在机头上。经实际测试,共形相控阵天线阵面的和波束在扫描范围内增益大于10 dBi,并具有较低的副瓣电平;差波束零深小于-20 dB。     

机载有源相控阵雷达天线测试系统设计

本文提出了机载有源相控阵雷达天线测试系统的设计准则以及系统的软硬件组成,解决了测试系统动态构建、快速升级问题,实现了机载有源相控阵雷达天线阵面一体化测试保障。     

星载SAR功能结构一体化天线技术研究

提出了新型低剖面合成口径雷达(SAR)有源相控阵天线设计方法———多功能结构一体化天线技术,采用高密度互联、新型功能材料等进行模块化、轻量化的系统级集成设计,将系统功能与天线结构相结合,大幅减小了SAR天线的体积,增大了内部可用空间;同时,有效去除天线寄生质量及各分系统间的重复质量。对SAR天线进行了一体化设计验证,结果表明天线性能、结构承载及热控的指标满足要求,多功能结构一体化设计方法对大型有源相控阵天线系统的结构设计有实际指导意义。     

毫米波多通道收发电路与和差网络一体化集成技术

相控阵天线的收发组件与和差网络通常是两个独立的模块,模块间通过接插件进行电连接,成本较高且集成度低。文中提出了毫米波多通道收发电路与和差网络一体化集成技术,将多通道收发组件与和差网络高密度集成在同一介质基板(PCB)上,芯片贴装界面与和差网络在不同层,射频和低频电路通过介质板层间和层内走线完成。最后制作8×16阵列进行无源测试验证,结果表明该一体化集成技术性能良好,具有小型化、轻量化、一体化高密度集成、制作成本低等特点,可广泛用于毫米波瓦式相控阵天线。     

数字相控阵天线测试平台

现代大型数字相控阵天线中,天线内的TR组件数目庞大同时工作频带很宽,阵面的暗室测试工作十分繁琐,工作量巨大。为简化测试过程,提高测试效率,文中对数字相控阵天线阵面的测试方案进行了研究,提出并搭建了一套测试平台,通过对天线阵面样机的试验,验证了测试方法的高效率和正确性。     

一种Ka波段片式相控阵天线集成化设计

介绍了一种256通道的Ka波段宽带片式相控阵天线的高集成设计方案,加工了实物并进行了测试。通过合理布局,借助低温共烧陶瓷(LTCC)工艺及三维堆叠等技术,实现了天线单元、T/R组件、综合层及电源模块等在天线口径内的高密度片式集成,整个有源相控阵天线的高度有效降低至约15 mm。设计上,通过基板挖腔及参数优化,将贴片封装天线的相对工作带宽扩展至17.1%;高密度的三维堆叠技术实现了T/R组件的小型化及轻薄化设计;在综合层内合理设置高密度的导热孔及导热球,将组件热量有效传导至冷板,从仿真来看整个天线阵面的温升仅约30℃。测试结果表明,该片式相控阵可在部分频段实现±30°的波束扫描而不出现栅瓣,法向波束的第一副瓣低于-12.9 dB。所设计的片式相控阵天线具有大带宽、高集成及二维可扩展等特点,有较高的工程应用价值。     

有源相控阵天线收发隔离度计算方法

提出了一种全双工有源相控阵天线射频链路系统收发隔离度的计算方法。基于微波网络理论,首先针对发射工作频率提取出发射天线阵面到接收天线阵面的耦合传输矩阵,计算出耦合到接收相控阵系统射频链路里的信号功率,其值必须小于低噪声放大器的输入1 dB 压缩点功率值,确定发阻滤波器的隔离度。然后针对接收工作频率提取出发射天线阵面到接收天线阵面的耦合传输矩阵,计算出从发射相控阵系统射频链路里耦合到接收天线阵面的噪声功率,其值必须小于接收相控阵系统的噪底,确定收阻滤波器的隔离度。最后研制了全双工有源相控阵天线原理样机并进行了测试,在与目标对接试验中,全双工有源相控阵天线工作时无失锁现象,接收通道能正常工作,验证了提出方法的正确性。     

过程集成技术在相控阵天线研制中的应用

通过对设计制造／测试／验证一体化系统的介绍，简要阐述了采用协同工作平台、信息集成接口、流程优化等方法实现过程集成的途径，叙述了过程集成技术在相控阵雷达天线阵面研制中发挥的作用．     

CAX一体化技术在相控阵雷达研制中的应用

通过对相控阵雷达天线阵面系统研制过程的分析,找出了影响研制效率的主要问题;应用CAX及其一体化技术,解决了天线性能仿真、协同工作平台建立、信息集成接口等关键技术问题,并简要介绍了相控阵雷达的一体化研制过程的实现情况.     

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