微波陶瓷小电容器

所研制的微波陶瓷芯片电容器系列可广泛用于各种微波电路中.在4至8GHz频率范围内,其电压驻波比和插入损耗分别为1.25和0.25dB.它们还具有尺寸小,可靠性高和使用方便等优点.某些品种的使用频率可达18GHz.     

微电子所研制成功8GS/s 4bit ADC和10GS/s 8bit DAC芯片

近日,中科院微电子所微波器件与集成电路研究室(四室)超高速电路课题组在超高速ADC/DAC芯片研制上取得突破性进展,成功研制出8GS/s 4bit ADC和10GS/s 8bit DAC芯片。ADC芯片采用带插值平均的Flash结构,集成约1250只晶体管,测试结果表明芯片可以在8GHz时钟频率下稳定工作,最高采样频率可达9GHz。超高速DAC芯片采用基于R-2R的电流开关结构,同时集成了     

一种新型微波开关的设计与实现

本文研究了一种新型的微波开关.利用震荡电路产生频率为50Hz(占空比为1%)的低频信号,低频信号通过施密特触发器得到10GHz的高频信号,然后通过高频振荡器发射微波束.利用波束障碍原理,当接收振荡器接收到的微波束经过滤波、放大、解调后,控制芯片(MSP430F149)对得到的幅值、低频频率、高频频率等参数进行判断,从而...     

InGaAsP PBC型激光二极管的弛豫频率和调制特性的研究

本文对BC型激光二极管(LD)从理论上导出弛豫振荡频率公式,并在实验上得到了验证.研制出高速LD组件,其调制频率可以达到5.3GHz.并在一公里光纤链路上测量了检测信号的载噪比、互调失真等特性.结果表明:该LD组件可用于直接传输C波段卫星下行信号(3.7～4.2GHz)的副载波复用光纤通信系统.     

高频微波电路用基板材料--LGC-046覆铜箔改性聚苯醚玻璃布层压板

近年来,随着信息产业的高速发展,对高频微波基板材料的需求突飞猛涨,而且随着高频信号传输设备(如汽车电话、移动电话、卫星信号设备等)及高频信号处理设备(如高速计算机、示波器、IC测试仪器等)的使用频率从MHz向GHz转移,对高频微波基板材料的性能也提出了更高的要求。     

MMIC在T/R组件中的应用

采用单片微波集成电路(MMIC)芯片技术和多芯片组件(MCM)微组装工艺,设计了一款小尺寸双通道发射接收(T/R)组件.组件由环形器、限幅器芯片、低噪声放大器(LNA)芯片、幅相控制多功能芯片、驱动放大器芯片和功率放大器芯片(PA)等部分构成.基于GaAs的LNA MMIC芯片具有更低噪声系数,基于GaN的PA MMIC芯片具有更高的输出功率及功率附加效率.组件接收通道采用基于GaAs的LNA芯片,发射通道采用基于GaN的PA芯片,设计了针对发射通道驱动放大器与功率放大器的协同脉冲调制电路.研制的T/R组件在8～12 GHz的频带内:接收通道在工作电压+5 V连续波的条件下,小信号增益大于20 dB,噪声小于3 dB;发射通道在周期1 ms,脉宽10％的调制脉冲条件下,脉冲发射功率大于46 dBm.T/R组件外形尺寸为70 mm×46 mm×15 mm.     

用于制造微波多芯片组件的LTCC技术

低温共烧陶瓷(LTCC)是实现微波多芯片组件(MMCM)的一种理想的组装技术,具有高集成密度、多种电路功能和高可靠性等技术优势.介绍了国内外应用于微波组件的LTCC技术发展现状,概述了LTCC的制造工艺流程,分析了其关键工艺难点,对LTCC基板电路的设计进行了详细阐述,并讨论了埋层电阻的设计和微带线和带状线间的垂直微波互联的方式.利用LTCC技术研制的微波多芯片组件,在现代雷达和通讯领域具有广泛的应用前景.     

E波段3.5 W GaN宽带高功率放大器MMIC

基于自主开发的100 nm GaN高电子迁移率晶体管(HEMT)工艺,研制了一款工作频段覆盖E波段(60～90 GHz)的宽带高功率放大器芯片.放大器采用密集通孔结构的共源极晶体管,降低寄生效应,提高器件的高频增益.同时采用三级级联拓扑结构,结合紧凑的微带线宽带匹配电路,在60～92 GHz频率范围内,典型线性增益达到...     

一种宽带幅相一致变频组件的设计与实现

介绍了一种宽带幅相一致变频组件的设计思路并给出测试结果.该组件在6～18 GHz工作频带内,幅度一致性≤±2.5 dB,相位一致性≤±25°,噪声系数≤7 dB.该变频组件采用了微波多芯片组件(MMCM)工艺,具有小型化、模块化、通用化的特点.     

微波和毫米波技术有助于电子战系统设计

许多现代电子战系统十分依赖微波和毫米波范围内高频技术的实现。当前的微波电子战系统很好地搜盖18GHz的频率范围,但是频率扩展技术必须致力于18到140GHz的水平。     

舰艇反导防御时的冲淡干扰效果仿真研究

冲淡干扰是舰艇防御反舰导弹的重要手段。本文以AGM-84A"捕鲸叉"反舰导弹为作战对象,在建立舰艇、反舰导弹和箔条云假目标的运动模型的基础上,对整个冲淡干扰反导过程进行了计算机仿真,重点研究了导弹来袭方向和风向对干扰效果的影响,并从理论上分析了原因。     

Markov game modeling of mimic defense and defense strategy determination

Network mimic defense technology enhances the robustness of active defense through the redundancy,dynamic and diversity as well as the decision feedback mechanism.However,little work has been done for its security assessment and existing classic game models are not suitable for its dynamic characteristics and lack of universality.A Markov game model was proposed to analyze the transfer relationship between offensive and defensive status and the measurement method of safety and reliability of mimic defense,and calculated the offensive and defensive game equilibrium through non-linear programming algorithm to determine the best defensive strategy considering performance.Experiments give a comparison with the multi-target hiding technique and shows that the mimic defense has a higher defensive effect.Combining with the specific network case,the specific attack and defense path for the exploit of the system vulnerability is given and the effectiveness of the defense strategy algorithm is verified.     

Ballistic-missile defense radars

Ballistic-missile defense has been continuously researched in the United States for the past 14 years. The Safeguard system itself is an outgrowth of both the Nike?Zeus system and later ballistic-missile components developed by various government agencies. The classic result of this early work was clear?an ICBM could be intercepted by another missile. Hence, the real controversy concerning the workability of such systems centered around an entirely different problem?the ``high-traffic environment'?or how to make tens to hundreds of near-simultaneous intercepts while tracking thousands of targets. This article describes the radars that have led to a solution of this problem, and how such radars operate within the framework of the world's most sophisticated defense system.     

Aerospace and defense

The challenge facing the European aerospace community after 1992, integrating members' individual capabilities into a decisively unified, noncontentious entity, is addressed. The two stellar examples of European cooperation in this area, the European Space Agency (ESA) and Arianespace SA, which builds and launches the Ariane rockets, are examined. ESA is a consortium of the national space research agencies of 13 countries and has overall responsibility for the development of Hermes, France's first manned space vehicle. Arianespace has 52 shareholder companies and research organizations in 11 countries; as the first company of its kind, it has captured more than half the world's commercial spacecraft launch-service business. The aerospace industry's biggest question, namely, what will happen in the defense sector, is discussed, focusing on the restructuring resulting from rising arms costs and changing political realities     

基于卷积神经网络的安全防御模式研究

计算机网络在为人们提供各种便利服务的同时也面临着许多的安全威胁,如木马或病毒等.不法分子通过网络攻击,破坏网络服务和用户数据,为人们带来严重的威胁.网络安全专家和企业机构提出了很多安全防御技术,一定程度上提高了网络安全防御能力,但是随着互联网数据和流量的快速增加,网络攻击的种类和数量呈现出指数级增长,急需提出新的防御技...     

DDOS的攻击与防御

文章介绍了拒绝服务（DOS）攻击和分布式拒绝服务（DDOS）攻击的概念,分析了DOS／DDOS攻击的原理,讨论了DDOS攻击的主要工具和防范策略,提出了一些DDOS攻击的应急措施以减少攻击所造成的影响。     

基于攻防博弈模型的网络安全测评和最优主动防范

随着社会主义现代化进程的不断发展和社会生产力水平的不断提高,近年来我国的计算机产业得以飞速发展,且已经成为促进我国经济发展的主要动力。本文通过以攻防博弈论为基础,通过建立模型的方式对网络安全测评和最优主动防范方法进行了具体分析。     

Integrated electronics in defense systems

The role played by the Department of Defense in the early development of integrated electronics is discussed and the current status of military application is summarized. The potential advantages of the new technology to military systems are outlined. These include improved reliability, savings in cost, improved maintenance and logistics supply, enhanced system effectiveness, design flexibility, shorter development/production leadtime and decreased size, and weight and power requirements. The paper concludes with a discussion of the question of military specifications and standards supporting the position that standardization in integrated circuits should for the present be limited to criteria for stating performance characteristics, methods of measuring characteristics and definitions and terminology.     

Conversion and the defense engineer

The authors examine the issue of how transferable engineering skills are from the military to the civilian sector. They argue that engineers ought to get involved in forging links between technology's capabilities and society's needs. They consider ways to bring this about