基于基片集成波导功分/合成器的宽带功率放大器研制

基于基片集成波导功分/合成器设计并研制了4路X波段宽带功率合成放大器.功分/合成器由一对4路树状功分器采用背对背方式组成,功分器输入输出端口均包含基片集成波导-微带转接结构,以便于功分/合成器与其他平面器件相连接.在9.3~12.3GHz范围内实测功分/合成器的回波损耗低于-13dB,传输损耗优于-3.3dB.设计并制作了一个X波段4路宽带功率放大器,合成功放在10.4GHz上的1dB压缩点输出功率约为7.1W(连续波工作方式),在8.9~12.3GHz范围内,合成效率大于60%,在9.5GHz上其最大合成效率约为73.6%.测试结果表明,该技术可方便地用于微波与毫米波固态功率放大器设计.     

径向功率合成器的理论和设计

结合雷达研制工作的需要,介绍了径向功率合成器的设计理论和方法.通过制作并测试X波段功率合成器,验证了该设计方法的可行性.同时给出了实物照片和测试数据.该功率合成器适用于X波段的8.0～8.5 GHz,可作为独立的功率合成器,也可以用作功率合成的基本单元.     

基于Multisim的硬币存钱箱仿真实验设计

基于Multisim软件对硬币存钱箱电路进行设计与仿真。通过光耦合器实现硬币检测单元模块,通过触发器及基本门电路实现脉冲发生单元模块,通过计数芯片实现计数单元,最终实现了硬币检测、硬币数量和总金额的显示及复位功能。采用Multisim软件对数字电路中的各种功能电路进行设计,学生进行简单的操作即可实现电路功能及其仿真波形的可视化,并可通过修改电路参数来观察参数变化对电路的影响。     

VHF波段功率合成器的理论和设计

结合最新雷达研制工作的需要,介绍了VHF波段中集中参数Wilkinson功率合成器的设计理论和方法,并用微波仿真软件对其进行优化.通过制作并测试该功率合成器,验证了该设计方法的可行性.同时给出了实物照片和测试数据.该功率合成器适用于VHF波段的110MHz-140MHz,峰值功率可达到6KW,可作为独立的功率合成器,也可以用作功率合成的基本单元.     

Ku波段10W功率模块设计

采用MMIC功率单片,提出一种Ku波段10W功率模块设计方案。使用电磁仿真软件ADS对模型进行辅助设计,对功率分配部分做了理论分析和试验结果的研究,并总结了相关经验,为微波放大模块设计提供了一定的技术借鉴。     

Ku波段40W固态功放设计

本文采用MMIC功率单片,提出一种Ku波段40W功率模块设计方案。使用电磁仿真软件ADS对模型进行辅助设计,对功率分配部分做了理论分析和试验结果的研究,并总结了相关经验,为微波放大模块设计提供了一定的技术借鉴。     

亳州广播电视台十千瓦全固态电视发射机冷却系统的改造

正一、发射机改造前的工作状态亳州广播电视台的七频道十千瓦全固态电视发射机于2008年5月份从发射机厂家购置。发射机在功放冷却环节上采用了获得国家专利的硬馈合成技术和空调风制冷技术。为获得理想的发射机射频功率输出,需要进行功率合成,即将数个固态功放器件的输出功率有效地合成相或,达到所需要的输出功率量级。这里不仅需要考虑匹配、效率、合成时各路之间的隔离,还有一个功率容量问     

3dB带状定向耦合器功率分配与合成在固态调频广播发射机中的应用及注意事项

<正>功率合成与分配技术在电视发送中应用较早,主要用于视频已调波和音频已调波的功率合成,而应用于广播发送则缘于近几年广播发射机的固态化,功率合成与分配在全固态发射机中担负着末级功放的重要作用,只有很好地了解功率合成与分配的工作原理,才能做到对发射机的正确维护、维修,不出现人为因素造成损坏。功率合成与分配是两个不可分割的相反过程,所谓合成是利用两个以上的功放同时对输入的功率进行放大后,通过合成网络将各输出功率相加,得到总的输出功率,以获得高稳定的功率增益,欲实现功率合成,必须先进行功率分配。功率分配是将欲放大的视频信号通过分配网络均匀地互不影响地同时分配给几个独立的功放。固态广播发射机功率合成与分配网络常见的有传输变压器、定向耦合器等。调频广播发射机常用定向耦合器来实现功率合成与分配。我台使用的两台意大利的的全调频立体     

毫米波倍频器的设计与研制

介绍了一种基于微带结构的W波段宽带三倍频器,阐述了倍频器的工作原理,建立了DBES105a肖特基二极管的反向并联结构模型,并基于场路结合的分析方法,设计并实现了W波段的宽带倍频器.测试结果表明,在75~98 GHz的频率范围内,其输出功率大于2 dBm,峰值功率大于5 dBm,与仿真数据基本吻合,证明了本文提出的混合电路建模方法及所提取模型的有效性.      

X波段四路高功率合成器设计

为X波段高功率合成设计了两套方案：一套为并馈功率合成,一套为串馈功率合成.在并馈方案中功率,功率合成用的是两级H面折叠魔T;在串馈方案中,功率合成用的是波导窄边功率合成器.给出了功率合成器的设计原理,并分别给出了两种方案的优缺点.最后仿真出的功率合成器各项指标均满足设计要求.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that