陈如山
电磁场数值计算、快速算法研究、微波铁氧体器件、微波集成电路与多芯片模块、电磁兼容理论。
个性化签名
- 姓名:陈如山
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者
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学科领域:
微波技术
- 研究兴趣:电磁场数值计算、快速算法研究、微波铁氧体器件、微波集成电路与多芯片模块、电磁兼容理论。
陈如山,男,生于1965年4月。1987年、1990年在东南大学电磁场与微波技术专业分别获得学士、硕士学位。1990年至1996年在南京理工大学任助教、讲师。1996年至1999年先后担任香港城市大学助理研究员、副研究员、研究员以及加拿大蒙特利尔大学研究科学家。2001年获香港城市大学电子工程专业博士学位。1999年至今任南京理工大学教授,通信工程系副主任,南京理工大学《电磁场与微波技术》博士学位授权点学术带头人,江苏省重点学科《通信与信息系统》学术带头人,博士生指导教师。主要从事电磁场理论与微波技术的教学和科研,先后为本科生、研究生讲授过8门课程,独立指导和协助指导博士、硕士研究生32名。研究方向包括:电磁场数值计算、快速算法研究、微波铁氧体器件、微波集成电路与多芯片模块、电磁兼容理论。在IEEE Transactions on Antennas and Propagation,IEEE Transactions on Microwave Theory and Techniques,IEEE Microwave Wireless and Components Letters,International Journal of Electronics,International Journal of Numerical Modelling, Microwave and Optical Technology Letters等刊物上先后发表论文120多篇,其中科学引文索引《SCI》收录论文88篇,工程索引《EI》收录论文86篇。根据中国信息科学所新闻发布会,他获得2000年度工程类科学引文索引《SCI》收录论文数全国第一。目前已申请国防发明专利2项,实用新型专利2项。曾获国家教委科技进步二等奖、三等奖,兵器工业集团公司科技进步二等奖,江苏省国防科技进步一等奖,江苏省科技进步三等奖,南京市自然科学优秀学术论文三等奖各一次。先后得到国家杰出青年科学基金、国家自然科学基金、国家人事部优秀回国人员基金、国防科工委基础研究基金、国防预研基金、江苏省自然科学基金等多项基金资助。2001年入选教育部优秀青年教师资助计划,2002年被推选为江苏省普通高等学校“青蓝工程”学术带头人。现为香港城市大学兼职高级研究员,中国电子学会高级会员,江苏省天线与微波专业委员会副主任委员,中国电子学会电磁兼容专业委员会委员,中国兵工学会电磁技术专业委员会委员,同时担任多种学术刊物(如IEEE Transactions on Antennas and Propagation,IEEE Transactions on Microwave Theory and Techniques,Microwave and Optical Technology Letters以及Journal of Electromagnetic Waves and Applications审稿人。
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739
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成果数
12
陈如山, R.S. Chen, *, †, X.W. Ping, D.X. Wang and Edward K.N. Yung
Int. J. Numer. Model. 2004; 17: 105-118,-0001,():
-1年11月30日
The anisotropic media and active properties of the perfectly matched layer (PML) absorbers significantly deteriorate the finite element method (FEM) system condition and as a result, convergence of the iterative solver is substantially slowed down. To address this issue, the symmetric successive over-relaxation (SSOR) preconditioning scheme is applied to the generalized minimal residual (GMRES) for solving a large sparse and non-symmetric system of linear equations resulting from the analysis of ferrite waveguide device by use of edge-based FEM. Consequently, this preconditioned GMRES (PGMRES) approach can reach convergence ten times faster than GMRES for the typical structures. Copyright # 2004 John Wiley & Sons, Ltd.
finite element method, generalized minimal residual method, preconditioning technique, symmetric successive over-relaxation
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【期刊论文】MODELING AND DESIGN OF INTERDIGITAL CAPACITOR BASED ON NEURAL NETWORKS AND GENETIC ALGORITHM
陈如山, R.S. Chen, X. Zhang, K.F. Tsang, and K.N. Yung
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS/Vol. 38, No.3, August 5 2003,-0001,():
-1年11月30日
In this paper, a novel approach is described to design an interdigital capacitor (IDC) using artificial neural networks (ANNs) and genetic algorithm (GA). The scattering parameters of the training samples are computed by the finite-difference time-domain (FDTD) and ANN is applied to describe the models of IDC. According to the engineering requirement, the dimensions of IDC can be designed with GA using the trained ANN models. This design procedure is proved to be time saving and of high accuracy.
artificial neural networks, genetic algorithm, interdigital capacitor, FDTD
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陈如山, R.S. Chen, *, †, D.Z. Ding, Z.H. Fan, Edward K.N. Yung and C.H. Chan
Int. J. Numer. Model. 2004; 17: 523-537,-0001,():
-1年11月30日
In this paper, the electromagnetic wave scattering is analysed by the efficient Krylov subspace iterative fast Fourier transform (FFT) technique in terms of the electric field integral equation (EFIE) for a dielectric body of general shape, inhomogeneity, and anisotropy. However, when the permittivity of the scatter becomes large, the convergence rate of Krylov subspace iterative methods slow down. Therefore, the innerouter flexible generalized minimum residual method (FGMRES) is used to accelerate the iteration. As a result, nearly 10 times convergence improvement is achieved for high permittivity cases. Copyright
electromagnetic wave scattering, Krylov subspace iterative methods, fast Fourier transform, GMRES, FGMRES
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【期刊论文】EXTENDED (FD)2TD FORMULATIONS FOR LUMPED ELEMENTS
陈如山, R.S. Chen, , Edward K.N. Yung, and C.H. Chan
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS/Vol. 38, No.3, August 5 2003,-0001,():
-1年11月30日
Currently extended finite-difference time domain (FDTD) formulations require the permittivity and conductivity to be independent of frequency. However, for many real materials of interest, these parameters vary significantly with frequency. The extended frequency-dependent finite-difference time domain (FD)2TD method makes it possible to analyze hybrid integrated circuits with lumped element within dispersive medium by combining lumped parameters (R, C, or L) and frequencydependent dielectric substrate in the algorithm. This method allows the full-wave analysis of virtually hybrid integrated circuits and gets parameters with a wide frequency range with one simulation.
Extended FDTD, (, FD), 2TD, lumped element, dispersive media
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【期刊论文】CAD OF MILLIMETER WAVE Y-JUNCTION CIRCULATORS WITH A FERRITE SPHERE
陈如山, R.S. Chen, , Z.B.Ye, Edward K.N. Yung, and K.F. Tsang
International Journal of Infrared and Millimeter Waves, Vol. 24, No.8, August 2003,-0001,():
-1年11月30日
A gradient optimization technique along with a definition of cost function is applied to the CAD of the circulator with a magnetized ferrite sphere for millimeter wave communications. A three. dimensional Finite. Difference Time-Domain (FDTD) approach for the analysis of this ferrite sphere based microstrip circulator is presented. The topology of the structure is enforced at each sted Of optimization and its physical dimensions are used as optimization variables. The cost function is defined using location of zeros and poles of the circulator's transmission, isolation. and reflection functions. Numerical tests show that theoptimization process converges from an arbitrarily selected starting point with the new definition of the cost fimction.
CAD,, millimeter wave circulator,, ferrite sphere,, FDTD
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陈如山, Ru-Shan Chen, Kai-Ning Yung, Chi H. Chan, Dao Xiang Wang, and Da Gang Fang
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 50, NO.4, APRIL 2002,-0001,():
-1年11月30日
The symmetric successive overrelaxation (SSOR) preconditioning scheme is applied to the conjugate-gradient (CG) method for solving a large system of linear equations resulting from the use of edge-based finite-element method (FEM). For this scheme, there is no additional computing time required to construct the preconditioning matrix and it contains more global information of the coefficient matrix when compared with those of the banded-matrix preconditioning scheme. The efficient implementation of this preconditioned CG (PCG) algorithm is described in details for complex coefficient matrix. With SSOR as the preconditioner and its efficient implementation in the CG algorithm, this PCG approach can reach convergence in five times CPU time shorter than CG for several typical structures. By comparison with other preconditioned techniques, these results demonstrate that SSOR preconditioning strategy is especially effective for CG iterative method when an edge FEM is applied to solve large-scale time-harmonic electromagnetic-field problems.
Conjugate-gradient method,, finite-element method,, preconditioning technique,, symmetric successive overrelaxation.,
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陈如山, R.S. Chen, *, †, D.X. Wang and Edward K.N. Yung
Int. J. Numer. Model. 2003; 16: 367-385,-0001,():
-1年11月30日
A novel numerical de-embedding scheme called the short-open calibration (SOC) technique, in conjunction with the vector finite element method (FEM), has been developed to characterize two-port network of arbitrarily shaped, three-dimensional discontinuities in microwave circuits. This SOC technique is effectively implemented into the FEM for boundary truncation of the unbounded circuit structures. In such a manner, fast convergence of iterative solver for large-sparse linear matrix equations from FEM is achieved. The SOC technique is used to remove parasitic effects brought by the approximation of the impressed voltage source and also the problem of resulting consistency between the two-and threedimensional simulations. Scattering parameters of discontinuous sections are constructed from the definition of port voltages and currents. Numerical solutions are well compared with those published in the available literatures. It is demonstrated that the features of the SOC technique are advantageous when combined with FEM for electromagnetic problems.
vector finite element, short-open calibration technique, PML three-dimensional discontinuity
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【期刊论文】Analysis of ferrite waveguide devices by use of the edge FEM combined with the SOC technique
陈如山, R.S. CHEN*†, D.X. WANG†and EDWARD K.N. YUNG‡
INT. J. ELECTRONICS, 2002, VOL. 89, NO.10, 771-790,-0001,():
-1年11月30日
In this paper, ferrite waveguide devices are analysed by use of the edge-based vector finite element method combined with the short-open calibration (SOC) technique. The formulation with both permittivity and permeability tensors for tetrahedral vector elements is analytically given in terms of the electric field. The SOC technique is directly accommodated in the FEM algorithm and used to truncate the computational domain. The SOC technique removes or separates unwanted parasitics obtained by the approximation of the impressed voltage source and the inconsistency between different simulations. Several types of ferrite waveguide device are analysed and the results are compared with those of the available publications. A good agreement is observed between them.
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陈如山, R.S. Chen, , Z.H. Fan, and Edward K.N. Yung
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS/Vol. 39, No.4, November 20 2003,-0001,():
-1年11月30日
this paper, electromagnetic wave scattering is formulated in terms of the electric-field integral equation (EFIE) for a dielectric body of general shape, inhomogeneity, and anisotropy. Applying the pulse-function expansion and the point-matching technique, the integral equation can be solved by the efficient Krylov subspace iterative fast Fourier transform (FFT) technique. Several typical Krylov subspace iterative FFT methods are used to solve the problems and their convergence behaviors are compared.
electromagnetic wave scattering, Krylov subspace iterative methods, fast Fourier transform
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陈如山, Edward Kai-Ning Yung, Senior Member, IEEE, Ru Shan Chen, Member, Ke Wu, and Dao Xiang Wang
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 46, NO.11, NOVEMBER 1998,-0001,():
-1年11月30日
This paper presents a class of new easy-to-fabricate ferrite-sphere-based waveguide Y-junction circulators for potentially low-cost millimeter-wave applications. A new threedimensional modeling strategy using a self-inconsistent mixedcoordinates-based modal field-matching procedure is developed to characterize electrical performance of the proposed circulator. It is found that the circulating mechanism of the ferrite-sphere post is different from its full-height ferrite counterpart in that the new structure operates in a turnstile fashion with resonant characteristics, while the conventional device operates on a transmission cavity model. Extensive comparable studies between he new and conventional circulators are made to show that the electrical behaviors of the new structure are also distinct and radial power-density profiles are not stationary, as in the case of the full-height ferrite post circulator for different geometrical parameters. Results obtained by the analysis techniqueare compared with the available results for a full/partial-height ferrite circulator, showing an excellent agreement. Our calculated and measured results are also presented for W-band circulators with the proposed ferrite-sphere technique, indicating some interesting characteristics such as the frequency offset behavior of the isolation and reflection curves. In addition, radial power-density profiles are plotted inside and outside the ferrite sphere to illustrate its intrinsic circulating mechanism, as well as its difference, as compared to its full-height ferrite structure.
Terms-Ferrite device,, junction circulator,, millimeterwave,, mode-matching technique.,
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