By Dr. Daniel Bouche, Dr. Frédéric Molinet, Professor Raj Mittra (auth.)

ISBN-10: 3642605176

ISBN-13: 9783642605178

ISBN-10: 3642644406

ISBN-13: 9783642644405

Numerically rigorous strategies for the computation of electromagnetic fields diffracted through an item develop into computationally extensive, if now not impractical to deal with, at excessive frequencies and one needs to generally hotel to aymptotic easy methods to resolve the scattering challenge at brief wavelengths. The asymptotic tools not just offer closed shape expansions for the diffracted fields, yet also they are important for eliciting actual interpretations of a few of the diffraction phenomena. one of many significant targets of this e-book is to debate the several asymptotic equipment in a unified demeanour. even supposing, for the sake of comfort, the ebook includes particular formulation for computing the sector diffracted by means of accomplishing or dielectric-coated items, it additionally offers the mathematical foundations of the various equipment and explains how they're interrelated. The booklet will, for this reason, support the reader collect either a operating wisdom and a theoretical realizing of the various equipment for fixing electromagnetic scattering difficulties at excessive frequencies.

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**Additional resources for Asymptotic Methods in Electromagnetics**

**Sample text**

Zos [iiM +bN]. 55) The fictitious field at any point along the creeping ray is deduced from the field at point S by following a procedure which is the same as that for a classical creeping ray (see Sect. 4). The only difference is the geometrical factor resulting from the application of the power conservation in a tube of rays. For the case of the source, the power is conserved in an infinitesimal pencil of rays, characterized by its initial angular width d\jl. After propagating on the surface, the width of the pencil becomes dYJ and the geometrical factor to be used is then ~dt/J / dYJ .

3 that, in the vicinity of the surface, this normal derivative is essentially directed along the binormal to the creeping ray and, consequently, along the same direction as the fictitious surface field. 46), Dsr,s' is simply the diffraction coefficient extracted from the solution of a twodimensional problem. However, a problem arises in the use of this coefficient because, as we will see in Chap. 3, the surface magnetic field of a magnetic creeping ray has a component along the binormal to the ray, proportional to 'tp, where 't is the torsion and p the radius of curvature of the geodesic followed by the ray.

It can also be defined as the distance between the point Q' and the second caustic. ) Dt:(Q') d(p~d+d) /kd n'. 27) When the incident electric field is along the binormal vector b(b = in), we can proceed to compute the field in a similar manner. 27) can be derived for the diffracted field; however, we must now use new diffraction coefficients denoted by Af, Df and af· For the general case, the incident field, orthogonal to the direction I of propagation of the ray, is in the plane defined by fi, Ei (Q) b and it can be resolved as = (E i (Q).

### Asymptotic Methods in Electromagnetics by Dr. Daniel Bouche, Dr. Frédéric Molinet, Professor Raj Mittra (auth.)

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