A new iterative method for scatterng problems is presented. This method is based on the tact that cutoff waves excited by a given source are shunted by pure reactive impedance and we consider that such waves come back to the source. This approach is applied to many scattering problems by perfectly conducting bodies and seems to be efficient, particularly in the range where the obstace dimensions are comparable to the wavelength.
SummaryIterative methods have been developed in the
torboat (VCA = 47. Curve b; VCA = 0, Curve c) calculated by the segments with duration about 30 s (solid line), and their approximation by ( 5 ) within the spectrum half-width 0.25 of the vessel velocity, and n = 3 for Curves a and b and 2 for Curve c. Figure 5 shows good agreement between the approximations and the experimental data.The presented analysis reveals the following:1. The spectrum of the amplitude fluctuation of the vessel-wave backscattering in the range of 20-30 dB can be approximated by the same functions as those normally used for the sea-wave spectrum approximation.2. The half-width of the spectrum of the amplitude fluctuation of the vessel-wave backscattering is about 25% of vessel speed, and the decreasing ratio of the spectrum tail is 6-Y dB/octave. 3. The azimuthal anisotropy of the vessel wave backscattering signal is nearly the same as that of the wind waves. and can be taken into account by use of (4) with the following coefficients: K = = 0.25, K , = 0.5: K= = 0.1, K , = 0.25.
ABSTRACT
The waue-concept iterative process (WCIP), a new iteratiue method based on the concept of waves, considers that the evanescent wave excited by a giuen source and shunted by pure reactiue impedance comes back to the source. This approach is successfully appliedto many problems of Scattering by perfectly conducting bodies. It is developed in the context of planar discontinuities. 0 ABSTRACT Hole-burning calculations related to distributed-feedback (DFB) stmctures are presented with the use of a numerical model based on the transfer matrix method (TMM) 111. The results correspond to the aboirethreshold regime of the laser and show that the hole-burning corrections may lead to strong deiiations from the near-ihreshold situation. 0 1996 John Wiley & Sons, Inc.
In this paper, a developed theory of a novel approach of the wave concept iterative process (WCIP) method is presented. This method is well used to demonstrate many attractive properties of metamaterials and to analyze metamaterial-based negative refractive index lenses by easy and speedy computation of the electromagnetic field distribution. These metamaterial-based circuits are established by using periodicL–CandC–Lnetworks. The results of simulation using the proposed method are justified theoretically.
Abstract-Metamaterials left-hand negative refractive index has remarkable optical properties; this paper presents the results obtained from the study of a flat metamaterial lens. Particular interest is given to the interaction of electromagnetic waves with metamaterials in the structure of the lens Pendry. Using the new approach of the Wave Concept Iterative Process (WCIP) based on the auxiliary sources helps to visualize the behavior of the electric field in the metamaterial band and outside of its interfaces. The simulation results show an amplification of evanescent waves in the metamaterials with an index of n = −1, which corresponds to a resonance phenomenon to which the attenuation solution is canceled, leaving only the actual growth of these waves. This amplification permits the reconstruction of the image of the source with a higher resolution.
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