周乐柱
主要研究领域是计算电磁学及其应用(复杂目标和介质的散射、天线和微波器件地分析和设计)。
个性化签名
- 姓名:周乐柱
- 目前身份:
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学术头衔:
博士生导师
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学科领域:
微波技术
- 研究兴趣:主要研究领域是计算电磁学及其应用(复杂目标和介质的散射、天线和微波器件地分析和设计)。
北京大学信息科学技术学院教授,博士生导师北京大学信息科学技术学院电子工程研究所所长,电磁场与微波技术专业负责人教育部“电子科学与技术”教学指导委员会委员中国电子学会会士,中国电子学会微波分会委员国际电子与电气工程师协会IEEE(天线与电波传播分会,微波理论与技术分会)高级会员。教育及工作简历: 1968年北京大学物理系本科毕业,1981年北京大学电子学系电子物理专业研究生毕业,获理学硕士学位,毕业后留校任教,1993年聘为教授。1991年8月―1993年3月,英国伦敦大学学院高级访问学者;1994年10月―1997年1月,英国曼彻斯特科技大学研究教授。主要学术成就:长期从事电磁场及微波理论与技术等方面的科研工作。八十年代,主要从事电磁场理论和微波电子学的研究,例如新型毫米波源―电子回旋脉塞(回旋管)的动力理论、开放式微波谐振腔、开放波导用于复介电常量的测量等。其中,在开放式谐振腔的理论方面作了系统的开创性工作。该项研究获国家教委科技进步奖二等奖,并有一篇专著在美国出版。九十年代以来着重研究计算电磁学特别是切向矢量有限元法在微波器件、天线和散射方面的应用。切向矢量有限元,又称边棱元,是九十年代初才发展起来的电磁场新型计算方法。周的研究是在英国工作时开始的,被英国同行誉为突破了一个新领域,有关研究获北京大学自然科学优秀成果奖二等奖。当前主要研究领域是计算电磁学及其应用(复杂目标和介质的散射、天线和微波器件地分析和设计)。计算电磁学是现代电磁场理论、现代计算方法和先进计算机技术相结合而产生的一门新兴交叉学科,其主要任务是通过计算机计算和模拟解决各种复杂的电磁问题,在涉及电磁波的产生、辐射、散射及传播的相关领域,如微波、光波源、天线、飞行目标雷达散射截面的计算、微波电路及器件的分析和设计及微波与光通信等方面都有广泛的应用。周至今已发表论文,专著,教材等六十多篇本,其中20多篇论文,被美国“科学引文索引”(SCI),“工程文摘”(EI),英国“科学文摘”(INSPECT)和 俄国“科学文摘”收录30多篇次。
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【期刊论文】Edge-based FEM Analysis of Coupled Slot-lines with a Ferrite Layer
周乐柱, Lezhu Zhou*, senior Member, IEEE and Lionel E. Davis**, Fellow, IEEE
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-1年11月30日
In this paper analysis and simulation ofthe eigen-mode fields of two sandwich coupledslot-lines with ferrite and dielectric layers arecarried out by using the finite element methodwith edge elements. Based on the analysis andsimulation, different devices such as switches andfour-port circulators, as well as directionalcouplers could be constructed by selecting theappropriate operating frequency, coupling lengthand bias magnetic field.
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周乐柱, Lezhu Zhou and Lionel E. Davis, Fellow, IEEE
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 44, NO.6, JUNE 1996 ,-0001,():
-1年11月30日
In this paper, finite-element method (FEM) formu- lations with edge elements for directly calculating the phase con- stants of ferrite-loaded waveguides with arbitrarily magnetized directions are presented. Dispersion characteristics are calculated for the partially-filled ferrite rectangular waveguide structure, where the dc field is in any arbitrary direction including parallel to any of the three axes. The variation of phase constants with the direction of dc magnetic field is illustrated. In order to solve the quadratic eigenvalue equation, which appears in the case where the magnetized direction is not parallel to the propagation, a simple and effective approach is proposed with no increase in the size of the matrices.
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【期刊论文】FEM Analysis of Coplanar Waveguide with Ferrite Magnetised in an Axial or Transverse Direction
周乐柱, Lezhu Zhou and Lionel E. Davis
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-1年11月30日
In this paper a detailed analysis of asandwich coupled slotline with axially or transverselymagnetised ferrite layer has been carried out by usingFEM with edge elements. Comparison of dispersioncharacteristics and phase shift shows that the variablereciprocal phase shift is larger with axial bias fieldthan with transverse field, and that non-reciprocalphase shift per unit length (with transverse field) in-creases with frequency whereas reciprocal phase shiftper unit length (with axial field) decreases with fre-quency. Also conductor-backed coplanar structuresmaybe more suitable than suspended structures.
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周乐柱, Zhao Xiao Ying, Zhou Le Zhu
,-0001,():
-1年11月30日
In this paper, the finite element method incorporated with Floquet theorem is used to solvethe 2-Dimentsional scattering problem of dielectric periodic structures that a plane wave is oblique orperpendicular incident. Comparisons of reflection and transmission properties for a kind of dielectricPhotonic Crystals with different structure parameters are nresented..
Index Terms--Photonic Crystal,, Finite Element Method(, FEM), ,, scattering,, Floqnet theorem,, dielectricperiodic structure.,
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【期刊论文】ELECTROMAGNETIC SCATTERING FROM LARGE TRANSVERSLY ANISOTROPIC INHOMOGEOUS CYLINDERS BY FEM-FMA
周乐柱, Zhang Yaoiiang*, Zhou Lezhu, Feng Zhenghe*
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-1年11月30日
Hybrid solution of finite element method (FEM) and fast multipole Algorithm (FMA) for transversally anisotropic inhomogeneous cylinders is presented. FMA is used to solve the integral equation to reduce the computing time and computer memory needs in electrically large objects and FEM to deal with anisotropic medium region. The accuracy and efficiency of the method are verified by numerical results.
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【期刊论文】Guidelines of Parameter Settings in 3D Fast Multipole Method
周乐柱, ZHANG Yaojiang*, GONG Zhonglin, ZHOU Lezhu, and FENG Zhenghe*
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-1年11月30日
Practical implementation of three dimension fast multipole method depends on theparameter settings include group number, multipole number and approximate integral etc. A simpleformula is derived so that the accuracy and efficiency of the method versus parameters can be easilyinvestigated. The guideline of the parameter setting is discussed and verified by numericalexamples.
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【期刊论文】Numerical research on the RCS of plasma
周乐柱, Zhefeng Yu, Zhlcheng Zhang, Lezhu Zhou, Wei Hu
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-1年11月30日
In this paper, the interaction between plasma and electromagnetic waves is studied. Itdemonstrates that high reflection coefficient requires low collision frequency and high plasmadensity. If its density is overdensed, the scattering characteristics of nonmagnetized collisionlesscold plasma and uletal conductor are comparable. As an example, the parameters of a plasmasphere with required RCS is given. The scattering characteristics of plasma with a large spacescale are also discussed.
plasma, electromagnetic wave, RCS
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周乐柱, Tan Yunhua*, Zhou Lezhu*, Zhang Yaojiang**
,-0001,():
-1年11月30日
A fast hybrid method--hybridedge-element method and fast multipole algorithm(FEM-FMA) is presented to analyzeelectromagnetic scattering by three-dimensionalanisotropic inhomogeous objects in this paper. Thematrixes formed from FEM are symmetric and thefast multipole algorithm is applied to accelerate thetraditional method of moment. The accuracy andefficiency of the method are verified by 3-Dnmnerical examples.
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【期刊论文】Mobile Satellite Communication System Based on General Smallsat Platforms1
周乐柱, Chen Fangyun, Zhou Lezhu, Lu Zhenlin, Lin Laixing, Zhou Tonghao, Guo Wenjia, Xiang Haige, Li dou
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-1年11月30日
This paper presents a summary description of a Mobile SatelliteCommunication System based on general Smallsat Platforms (MSCGSP). MSCGSPis a proposed system with communication and positioning functions, which willintegratively utilize satellites in GEO, MEO and LEO to provide 24-hour continuemobile communication and positioning and navigate services for all domestic regionof China (including sea area) and most of global region. A key concept of MSCGSPis the utilization of general small-satellite platforms (GSP).Technical Subject Satellite and Space Communication Analysis and Techniques.
mobile satellite communication,, smallsat platform,, GEO satellite,, MEO satellite,, LEO satellite.,
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