C波段高功率铁氧化移相器的研制

介绍了一种高功率、低电流的铁氧体移相器。在１０％带宽内，其承爱的平均功率能达到１００Ｗ。磁化峰值电流只需７Ａ。该器件已应用于舰载雷达平面陈阵列线中。本文叙述了突破高功率、低电流两项关键技术的方法和途径。     

C波段高功率铁氧体移相器的研制

介绍了一种高功率、低电流的铁氧体移相器。在１０％带宽内，其承受的平均功率能达到１００Ｗ，磁化峰值电流只需７Ａ。该器件已应用于舰载雷达平面阵列天线中。本文叙述了突破高功率、低电流两项关键技术的方法和途径。     

铁氧体双模器件的广义理论

铁氧体双模器件包括双模移相器,圆极化移相器,旋转场移相器.双模变极化器等等.其种类繁多,每种器件由若干基本双模段级联而成.每个基本单元上,外加磁场形式各不相同,有四磁极磁化场,纵向磁化场,双磁极磁化场及其混合磁化场.本文拟用统一的理论对其进行处理及分析并引入具体实例使用CAD技术进行计算,从而进一步确认理论的正确性.     

Reggia—Spencer移相器相移机理研究

用非简并耦合波方程研究了Reggia-Spencer移相器的工作机理，其结果指出；在非同步耦合条件下，移相器的相移随着耦合因子Q的减小而增强；移相器中传播的本征模式是右旋，左旋椭圆极大波，它不随传统方向或磁化方向而变。     

优质铁氧体微带移相器设计中的磁参数

基片磁化状态是影响非互易闭锁式铁氧体微带移相器性能的主要因素之一。提高基片剩余磁化强度,增大器件闭锁态的磁化强度4M与基片饱和磁化强度4Ms的比值R(=4M/4Ms),对于降低器件插入损耗、提高相移效率、扩展频宽、减小驱动功率等均是有利的。文中还分析比较了不同的磁化方式,并给出了单位和多位器件的主要性能。     

纵向场铁氧体双模波导的本征模问题

讨论了矩波导在充满纵向磁化铁氧体情况下的本征模问题，指出在波导中存在有四种本征椭圆极化波。这些本征模式已被ANSOFT—HFSS软件仿真计算所证明，其结果和本征模理论一致。本征模传播机制成功地解释了若干互易铁氧体移相器如双模移相器、R—S移相器和椭圆模移相器的基本原理。     

双模铁氧体器件的理论和设计(一)

本文从复合磁化场双模铁氧体变极化方程出发，研究各种双模器件的工作原理，包括V／Φ型和V／F型全极化器，双模旋转场器件。对双模移相器、旋转场移相器、圆极化移相器的相移／极化相关性作了深入讨论，并分析了移相器的精度问题。     

分布式MEMS移相器桥高度与相移量的机电集成模型及应用

移相器是控制相控阵天线空间波束捷变的方向盘,其性能的优良决定着相控阵天线性能的高低。微机电系统(MEMS)移相器优势明显,但由于相控阵天线工作环境复杂,环境载荷会导致MEMS移相器结构变形,进而直接降低整个相控阵天线的性能。为此,该文研究MEMS移相器关键结构参数和电性能之间的耦合关系,将复杂环境要素对物理结构的影响传递到结构参数和电参数上,推导出分布式MEMS移相器的机电集成模型,并利用集成模型对变形MEMS移相器进行电性能快速评估和结构公差计算。仿真结果说明了集成模型的有效性和工程应用价值。     

圆极化铁氧体移相器分析

结合HFSS 软件，采用不同方法对圆极化铁氧体移相器的相移进行了对比计算，计算的结果互相吻合。对均 匀磁化情况，用数值积分法分析了圆极化相移和反磁化相移，并证明了圆极化相移的互易特性。对非均匀磁化情况， 分析了铁氧体棒与磁轭结合部位的横向磁化场对相移和极化的影响。     

电磁场、电磁理论

0319919隧道中低频导行电磁波的传播特性[刊]/孙继平//电波科学学报,—2003,18(2).—202～206(L)在低频段上,导行电磁波的衰减率很小.随频率的升高而缓慢增加,不论单线波模还是双线滤模其近壁效应都很小。用数值分析方法求解了单线波模方程和双线波模方程,得出的主要结论为它们的衰减率与隧     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.