采用次谐波混频技术的毫米波超宽带混频器研制

提出了一种次谐波混频技术结合宽带匹配滤波电路的设计方法,能有效降低本振源的制作难度,并可扩展中频带宽。应用高频场仿真软件以及谐波平衡仿真软件,研制了两个频段的超宽带次谐波混频器。测试结果：K频段混频器,固定本振频率15 GHz,射频频率在18～26.5 GHz的频带内变化时,变频损耗小于10.7 dB,最小变频损耗为7.5 dB;Ka频段混频器,固定本振频率22 GHz,射频频率在26.5～40 GHz的频带内变化时,变频损耗小于11.5 dB,最小变频损耗为8 dB。测试结果指标与传统的双平衡混频器指标相当,证明了电路设计方案的正确性。     

Ka频段宽带镜频抑制谐波混频器的设计

介绍了一种在Ka频段具有镜频抑制功能的四次谐波混合集成电路混频器的设计与实现.该混频器主要采用微带混合集成电路,由薄膜陶瓷基片制作.经测试,当中频固定在70 MHz,在射频大于4 GHz带宽内,变频损耗小于11.2 dB,镜频抑制度大于20 dB.     

低本振宽带混频器

本本介绍一种低本振电平(P_L为-5dBm～-15dBm),加偏置的宽带专用混频器。其典型指标为:在3.5～6.4GHz频带内,变频损耗(当P_L为-10dBm时)Lc约7.5dB、波动±1dB、并且可在3～7GHz频带内正常工作,L_c小于9dB,中频频率为100～200MHz。     

W波段印刷电路宽频带平衡混频器

本文介绍用廉价的Ku波段混频二极管研制W波段印刷电路平衡混频器的计算机辅助设计技术和实验结果。整个电路集成在一块软基片上,基片装在E面剖开的波导盒内,结构简单,生产性好。在80至100CHz频带内,混频器变频损耗小于12分贝。     

宽频带混频器

这种混频器包括网端环行器、二极管管座和用来抑制乱真(Spurious)频率信号的滤波器。输入信号的标称频率是6千兆赫。本机振荡器信号调制从输入端看过去反射系数,由此产生两个边带的信号。带宽为490兆赫,A 频段的输入信号频率为5.93～6.155千兆赫,B 频段的输入信号频率6.195～6.42千兆赫。为高可靠起见,选用了点接触式硅二极管作为有源元件来取代常用的肖特基势垒二极管。在定向滤波器中还采用了微带线技术,以减轻重量。     

Ku频段多通道抗振激励源设计

介绍一种Ku频段多通道抗振激励源设计,采用X频段抗振低相噪介质稳频振荡器(DRO),通过结构固连减少各部分电路在振动环境中的相对运动,保证了激励源在振动条件下的稳定性.采用二次谐波镜频抑制混频器一次变频,简化了激励源电路并实现了对本振泄漏的高抑制度和良好的边带抑制.多芯片微带混合集成设计实现了激励源的小型化.研制的样机达到了振动环境下相噪优于-97 dBc/Hz@10kHz,本振抑制大于32 dB、边带抑制大于35 dB的优良性能,验证了设计技术的有效性.     

一种高线性短波宽带混频器的设计

采用双平衡场效应管结构和阻抗匹配技术设计了一种适用于短波宽带接收机的高线性 混频器,通过调整场效应管的沟道宽度和偏置电压优化了混频器的性能指标。该混频器射频 输入频率为15～30 MHz,本振输入频率为715～100 MHz,中频输出频率为70 MHz。测试结果表明：输入三阶截点高于40 dBm,变频损耗小于7 dB,1 dB 压缩点高于12 dBm,单边带噪声系数小于7 dB。     

系统级封装的S频段射频收发模块研制

研制了一种小体积的S频段射频收发系统级封装(SIP)模块,内部集成了基于多种工艺的器件。模块接收通道一次变频,发射通道二次变频,内部集成中频和射频本振信号源。模块采用双腔结构,不同腔体之间通过绝缘子进行垂直互连,大大减小了模块体积,模块体积为40 mm×40 mm×10 mm。模块采用正向设计,其主要指标的测试结果为：接收通道动态范围-100~-40 dBm,输出信号0~2 dBm,噪声系数小于等于2.8 dB,带外抑制大于等于50 dBc;发射通道输出信号大于等于2 dBm,二次、三次谐波抑制大于等于60 dBc,杂波抑制大于等于55 dBc,相位噪声在1 kHz和10 kHz处分别小于等于-82 dBc/Hz和-91 dBc/Hz。实测结果与仿真结果基本一致。     

射频制导半实物仿真专用毫米波变频组件设计

为了扩展射频制导半实物仿真系统的工作频带,设计了一种半实物仿真专用变频组 件,采用具有公共参考源的二次变频方案。关键器件包括微波锁相倍频源、微波基波和谐波 混频器、毫米波放大器。经测试,该组件幅度和相位的稳定性高,动态范围大,频谱特性好 ,能满足仿真应用需求。     

30GHz单片接收机

已经研制成功30GHz接收机用的几种单片集成电路.低噪声放大器芯片在14dB增益时噪声系数为7.dB,中频放大器在30dB控制范围内,增益为13dB.混频器和移相器变频损耗和插入损耗分别为10.5dB和1.6dB.     

Universal Coverage, Pinpoint Illustration and Profound Impact HTC 2008 Intermedia Recommendation and Introduction Meeting

Holding 88 percent of train media resources across China, based on "Time Cube", on the 2008 Intermedia Recommendation and Introduction Meeting on December 19, 2007, HTC announced its high-profile strategy of tour marketing and tapping the immeasurable potentials on the train. Meanwhile, HTC officially launched its brand new product Olympic Train on the meeting, providing a fabulous platform for all the brands that are prepared to do a smart marketing on the occasion of 2008 Olympic Games.     

Market presence in China strengthened Network growth and Dual-Chinese-Hub Strategy More frequet Flyer Benefit——Air China and shanhai Airlines Join Star Alliance

In the end of 2007, Air China Limited (hereinafter "Air China") and Shanghai Airlines, formally joined Star Alliance at a ceremony held in the new Terminal Three at Beijing Capital International Airport. With the addition of the two Chinese airlines, Star Alliance now has 19 member carriers operating 17,000 daily flights to 897 destinations in 160 countries.     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Sinosteel：Extraordinary Moves in Industry Chess

Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service ＆ trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,＂In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves.＂     

Walk Through Unusual Five Years—— An Exhibitor＇s Canton Fair Course

When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years＇ experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year.     

A World of Love 2008 Music Grand Ceremony

Under the guidance of the theme slogan of the 29th Olympic Games - One World One Dream, with dream, love and dedication as its theme, the 2008 Music Grand Ceremony ＆ 1000 People Charity Concert on 100 days cotmtdown to Paralympic Gamesis officiaily launched on December 22, 2007. The 2008 Music Grand Ceremony is sponsored by China Disabled Persons＇ Federation, and co-hosted by National Paralympic Committee of China,     

China''''s National Oil Reserve Center was Born

Aseries of events that occurred in October 2007, are rewriting the history of China's energy industry: November 3 an Energy Law Committee asked the public for suggestions on improvements; forty top experts came together to form the National Energy Expert Advisory Committee on November 6; and the National Oil Reserve Center (NORC)became the nerve centre of oil reserves on November 18. Yet, behind the progress of these recent activities remains the fact that international oil prices still hover around a very high price of US$ 90/barrel, and China's oil imports are close to accounting for half of its total oil reserves.     

MUYANG GROUP

With its headquarters in the historic city of Yangzhou,Jiangsu Muyang Group Co.,Ltd has since its founding in 1967 grown into a well-known group corporation whose activities cover research ＆ development,project design,manufacturing,installation and services in a multitude of industries including feed machinery and engineering,storage engineering,grain machinery and engineering,environmental protection,conveying equipment and automatic control systems.     

2007 China Harbor Ten People

2007 China Harbor Ten People elected the entrepreneurs who contributed a lot to port economy and enterprises this year trough their talent management.These ten people embody their social responsibility,professional skills,creative ability,and charming personality.Bearing full confidence in China＇s port economy,the port entrepreneurs are brave enough to explore a brand new area,so as to promote harbor economic development. At the very beginning of 2008,China Shipping Website,Dalian Maritime University,and China Port and Shipping In- stitute jointly select the 2007 China Harbor Ten People,demonstrate port entrepreneurs＇ stunning minds,disclose their secrets to success,and providing abundant experiences to others in harbor development.The top ten people are various excellence during the ups and downs harbor development.