摘要:

This article treats absorption of electromagnetic waves by thin multilayer magnetogyrotropic structures. Two types of structures with uniaxial magnetic anistropy in each layer are proposed. In structure I, easy magnetization axes in layers are normal to the layers plane. In structure II, easy magnetization axes are parallel to one of the coordinate axes, lying in the layers plane. Structure I is made as glass-fiber-reinforced plastic, with each layer containing a set of tiles, made from textured hexaferrites. This structure can also be made from multilayer fabrics of ultrahigh molecular weight polyethylene fibers, filled with magnetically uniaxial hexaferrites, having natural ferromagnetic resonance frequencies from 14 to 40 GHz. Structure II is made as multilayer fabrics from ultrahigh molecular weight polyethylene fibers, filled with hexaferrites, having a plane or cone of magnetization and natural ferromagnetic resonance frequencies 1 to 20 GHz.

ISSN:0272-6343    

DOI:10.1080/027263400750068505

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

When applied to the electromagnetic scattering problem, the method of moments (MoM) results in a full matrix representation which requires a large amount of computational resources. To circumvent this problem, the numerical technique presented here works directly on the efficiency of the interpolation scheme used in the MoM, introducing an extrapolated version of Gordon's interpolation. This new method is applied to a generalized version of the volume surface integral equation to solve two-dimensional scattering problems. It is shown how it results in the decomposition of the problem into three simpler independent problems which can be performed either in sequence or in parallel. The performances of the method are confirmed by convergence tests, and the extrapolated MoM is illustrated on the case of the scattering by a microstrip structure.

ISSN:0272-6343    

DOI:10.1080/027263400750068514

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

A material combining both mirror-conjugated and racemic chirality properties is characterized and classified within the context of linear bianisotropic mediums. Planewave propagation in the chosen material is studied with particular emphasis on the interaction of different and no handedness along certain specified directions. Comparison is made with isotropic chiral mediums as well as uniaxial bianisotropic mediums.

ISSN:0272-6343    

DOI:10.1080/027263400750068523

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

The physical theory of diffraction with transition currents (PTD-TC) is used to predict the electromagnetic fields diffracted by obstacles with or without edges, and its usefulness is verified by applying it to perfectly conducting rectangular and ogive cylinders. Edge and transition currents are borrowed from the solution of canonical problems of wedge and circular cylinders. Transition currents of curved surfaces are represented in the form of the Fock-type integral. For an obstacle with edges, the currents near the edges are expressed by eigenfunction expansion. The currents of other parts are represented by the Fresnel integral, which has a slightly different form than that derived by Kouyoumjian and Pathak. Numerical results of far-scattered patterns are obtained and compared with those obtained by the method of moments. It was found that the present method gives very precise results.

ISSN:0272-6343    

DOI:10.1080/027263400750068532

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor