光纤双波长数字式测温仪系统研究

本文系统地介绍了一种双波长光纤测温仪的原理、结构及特点,其突出优点有：采用双波长窄带比较技术和以微控制器,可编程外围芯片为核心,构成数字化、小型化光纤传感系统,抗干扰能力强,具有通信接口,可与过程控制网络连接,支持流行的现场总线协     

A miniaturized broadband bow-tie antenna with improved cross-polarization performance

In this paper, a modified broadband bow-tie antenna with low cross-polarization level and miniaturization is presented. The cross-polarization in both E- and H-planes are suppressed by defecting the antenna flares using rectangular slots. The proposed modified antenna demonstrated a cross-polarization improvement over $\pm 120°$ around the boresight from 2 to 5 GHz. In addition, an overall 23.5% of miniaturization compared to conventional bow-tie antenna is achieved. A tapered feed transition between microstrip-to-parallel stripline is designed to match 50 ohm SMA connector to the antenna flares. A prototype of the modified antenna is fabricated on RO4003 substrate ($\epsilon$_r = 3.38, tan $\delta$ = 0.0027, h = 0.813 mm), and its performance is experimentally studied. The antenna’s characteristics including return loss, gain and radiation pattern are measured, along with the time domain characteristics, and showed reasonable agreement with the simulated results.     

宽带高功率耦合器的小型化设计分析

宽带高功率耦合器是宽带高功率放大器中的重要部件。为了实现宽带高功率放大器中耦合器的小型化设计,提出了耦合器设计的小型化方案。用电路和电磁场仿真技术解决了宽带高功率耦合设计中的几个关键技术问题,即耦合线耦合器设计、幅度均衡器设计和元器件的敏感性分析等问题,最后实际制作了一个仿真设计的样件,测试技术指标与仿真吻合,说明了这种设计方案的有效性。     

Functionality-power-packaging considerations in context aware wearable systems

Wearable computing places tighter constraints on architecture design than traditional mobile computing. The architecture is described in terms of miniaturization, power-awareness, global low-power design and suitability for an application. In this article we present a new methodology based on three different system properties. Functionality, power and electronic Packaging metrics are proposed and evaluated to study different trade offs. We analyze the trade offs in different context recognition scenarios. The proof of concept case study is analyzed by studying (a) interaction with household appliances by a wrist worn device (acceleration, light sensors) (b) studying walking behavior with acceleration sensors, (c) computational task and (d) gesture recognition in a wood-workshop using the combination of accelerometer and microphone sensors. After analyzing the case study, we highlight the size aspect by electronic packaging for a given functionality and present the miniaturization trends for ‘autonomous sensor button’.     

爆炸平面开关的设计及研究

为了进一步减小爆炸箔起爆器系统体积,并降低生产成本,设计并制备了一种爆炸平面开关,并对该爆炸平面开关的电极间隙和放电特性进行研究.结果表明:随着间隙电极的间隙距离减小,其开关的作用时间缩短;对于同一起爆电压的爆炸平面开关,随着放电电极间隙的增大,其冲击片雷管的爆发电流呈下降趋势.     

基于堆叠式组装技术的微小型多处理器系统

针对贫点阵探测器,设计了一套多处理器信息获取系统.介绍了系统的总体架构,着重讨论了多处理器模块功能实现方法和小型化设计方案.采用分时复用技术进行多通道信号采集,采用SMBus总线进行数据传输,采用三单片机协同工作方式提高系统速度,采用双频工作模式降低系统功耗,采用堆叠式组装技术减小系统体积.该系统探测帧率大于1 kHz,峰值工作电流小于30 mA,最大功耗小于100 mW,体积控制在西10 mm×12 mm的空间内,适用于微小型光电目标探测领域.     

Rolling of functional metallic surface structures

Due to functional enhancement and beneficial product properties, surface structuring of large semi-finished products and part components becomes more important. Rolling of so-called riblet structures for drag reduction on surfaces in fluid-dynamics is presented within this contribution. The examination of a novel roll structuring process via defined steel wire winding is the primary topic. Both practical experiments and numerical simulations of the riblet rolling process point out potentials and limitations of the new structuring approach. Rolling of uniformly shaped riblets with a lateral distance of less than 100 μm is assumed to be possible on large sheets in future.     

SIR结构ACPW滤波器研究

文章提出将SIR谐振器结构应用于非对称共面波导传输线中,设计了一种新型SIR结构非对称共面波导带阻滤波器。通过四个SIR谐振单元在非对称共面波导传输线中级联,有效地改善了滤波器的插损和带宽。结果显示,本滤波器中心频率为1．8GHz,最小插损为0．4dB,相对带宽为33．3％,最大带外抑制为-60dB。具有小体积、低插损、高抑制、宽阻带、易于加工等优点。     

K波段小型化收发前端的研制

为了显著降低K波段雷达收发前端的尺寸,提高系统性能,研究了一种基于低阻硅埋置腔体和BCB/Au金属互连的毫米波系统级封装技术,采用两层BCB涂覆的方式改善了BCB覆盖不均的情况。制备的K波段雷达收发前端中包含压控振荡器、低噪声放大器、混频器及功分器,尺寸仅有6.4*5.4 mm2,测试结果显示,在22.5 GHz 到 22.9 GHz的频带内,发射功率大于11dBm,中频增益大于10dB, 发射端到中频输出端隔离度大于30dB,满足系统小型化、高性能的需求。     

基于LTCC技术的小型化MarchandBalun设计

在对巴伦的基本原理和耦合传输线奇偶模阻抗特性研究的基础上,基于LTCC技术设计了中心频率为1．35GHz的小型化MarchandBalun。设计中使用宽边耦合带状线来实现MarchandBalun内部的耦合区段。仿真结果表明,MarchandBalun的中心频率为1．35GHz,S11为．31．39dB;带内插入损耗在-0．55～1．12dB之间,满足设计指标的要求。