The design of planar multi-layer coatings with high absorption for a desired frequency and angle range is presented. The design technique is based on Particle swarm optimization (PSO). PSO is an evolutionary optimization algorithm based on the bird fly. Several design cases are presented. Numerical results that are compared with the existing in the literature show the advantages of this approac...

Irradiated materials that are weakly absorbing are heated by both diffusive and direct heating. This creates various internal heating patterns and introduces the possibility of developing hot spots in the specimen that are not detected by surface monitoring. These systems are investigated for a single instantaneous radiation pulse and for a chain of such pulses. Characteristic times are identif...

The present paper establishes characteristics of the relative magnetic permeability spectrum μ(f) of magnetic materials at microwave frequencies. The integral ∫ ∞ 0 . ). ( ' ' df f f μ of the imaginary part of μ(f) multiplied with the frequency f gives remarkable properties. A generalisation of Snoek’s law consists in this quantity being bounded by the square of the saturation magnetization mul...

New procedure for permittivity and permeability extraction of two composite (dielectric matrix + magnetic inclusions), isotropic and homogeneous absorbing material is presented. It calculates mentioned parameters by fitting measured transmission data with Debye relaxation model (for complex dielectric permittivity extraction) and with Lorenzian resonant model (for complex permeability extractio...

Recently, Berenger introduced a Perfectly Matched Layer (PML) technique for absorbing electromagnetic waves. In the present paper, a perfectly matched layer is proposed for absorbing out-going two-dimensional waves in a uniform mean ow, governed by linearized Euler equations. It is well known that the linearized Euler equations support acoustic waves, which travel with the speed of sound relati...