ISSN:0894-3370    

DOI:10.1002/jnm.1660070202

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractSeries function expansion algorithms of the time‐domain analysis of boundary value problems are discussed. Electromagnetic fields inside a structure under investigation are expanded into series of basis functions and the expansion coefficients are found by means of the Galerkin method. The numerical cost of algorithms is discussed and a cost efficient approach is proposed for formulations using sine and cosine expansion functions. Compared with conventional time‐domain methods the algorithms described show the time evolution of the expansion coefficients rather than the samples of a physical continuum at discrete no

ISSN:0894-3370    

DOI:10.1002/jnm.1660070203

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractA new approach to efficiently compute the low‐frequency eigenmodes of a time‐domain model approximating a linear physical system is proposed. The method is based on principles known from digital signal processing, in particular from parametic spectrum estimation, so it is not surprising that the achievable accuracy is much higher than the accuracy of the usual non‐parametric discrete Fourier transform approach. The algorithm works in the general lossy case even for a very large number of unknowns and can easily be extended to calculate steady‐state solutions under sinusoidal excitations for several different frequencies simulta

ISSN:0894-3370    

DOI:10.1002/jnm.1660070204

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractIn this paper we demonstrate the use of differential equations by means of an example from network analysis and show that differential/algebraic equations (DAE), rather than explicit ordinary differential equations (ODE), are more suitable for the description of electrical systems and networks. The main ideas of numerical integration of ODEs are presented. We consider this material from the point of view of replacing the ODE by a difference equation (DE). In particular, the relationship between the ODE and the associated DE is discussed. In the last Section the application of integration methods for OEDs upon DAEs and its difficulties are discussed. The paper is intended as a review; but a few new results are also included.

ISSN:0894-3370    

DOI:10.1002/jnm.1660070205

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractIn this paper the traditional square mesh 2D‐TLM algorithm is generalized for rectangular meshes of arbitrary aspect ratio. It is shown that the anisotropic rectangular TLM network can be conceived in such a way that the propagation vector remains independent of the direction of propagation in the infinitesimal approximation. A full dispersion analysis of the rectangular mesh in then performed for the general case, and results are compared to that of the traditional square mes

ISSN:0894-3370    

DOI:10.1002/jnm.1660070206

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractApplying the method of moments to Maxwell's equations, Yee's two‐dimensional FDTD scheme with central difference approximations and the two‐dimensional TLM method are dervied from first principles of field theory. By comparing the eigenvalues of the two methods, the differences between two‐dimensional FDTD and TLM are illust

ISSN:0894-3370    

DOI:10.1002/jnm.1660070207

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0894-3370    

DOI:10.1002/jnm.1660070201

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY