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Numeryczna analiza wpływu parametrów elektrycznych ścian wykonanych z betonu na wartości natężenia pola elektrycznego

Choroszucho A., Butryło B.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 12

161-164

PL

Celem publikacji jest analiza wpływu zmienności wartości parametrów elektrycznych nieidealnego i absorbującego dielektryka (beton) na wartości natężenia pola elektrycznego. Przedmiotem analizy był odosobniony układ zawierający różnej grubości ścianę wykonaną z powszechnie stosowanego materiału budowlanego – betonu zwykłego. Zaprezentowany został rozkład pola generowanego przez system komunikacji bezprzewodowej pracujący przy standardowych częstotliwościach (f = 2,4 GHz oraz f = 5 GHz). Zastosowano numeryczną metodę różnic skończonych w dziedzinie czasu (FDTD). Szczegółowo omówiono wpływ stosowanych w literaturze wartości przenikalności elektrycznych oraz konduktywności betonu na wartości natężenia pola.

EN

The aim of this article is the analysis of the influence changeability of values electrical parameters non-ideal and absorbing dielectric (concrete) on the values of the electric field intensity. The object of the analysis was separated system contained the different thickness wall made of universal used building material – concrete. The presented situation is one of the distribution of electromagnetic field generated by a wireless communication system operating within the standard frequencies (f = 2.4 GHz and f = 5 GHz). The finite-difference time-domain method (FDTD) was used. In detail, the influence of using in the other publications the values of electrical permittivity and conductivity of concrete on the maximum values of the electric field intensity was discussed.

2

Simulation and design of a wideband T-shaped photonic crystal splitter

Foghani S., Kaatuzian H., Danaie M.

Optica Applicata

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2010

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Vol. 40, nr 4

863--872

EN

In this paper, a high efficiency 2-D T-shaped photonic crystal beam splitter is proposed. It consists of a square lattice of GaAs rods (n = 3.4) embedded in air. The photonic crystal structure proposed can be used for 1550 nm wavelength, which is an important wavelength for optical fiber data transmission. Finite difference time domain (FDTD) simulation results demonstrate that a conventional T-junction can only provide 78% transmission coefficient (39% for each branch) for the incident light, while the proposed T-shaped splitter transmits over 90% of the incident light beam (over 45% from each branch) in the single mode region of waveguide. Especially it transmits nearly 98% (49% from each branch) of the input light in the wavelength of 1550 nm. In other words, the proposed devise shows higher beam splitting efficiency and a wider range of flatness of transmission power spectrum in comparison with previous works.

3

Two-dimensional numerical analysis on mid-infrared emission from IV-VI lead salt photonic crystal microcavity

Mukherjee S., Bi G., Kar J. P., Shi Z.

Optica Applicata

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2009

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Vol. 39, nr 3

499-509

EN

An optimal design of two dimensional (2D) hexagonal photonic bandgap (PBG) resonating micro-optical defect cavity on IV-VI lead salt material has been carried out. The nature of both the transverse electric (TE) and transverse magnetic (TM) band structure for the electromagnetic waves in the periodic triangular lattice pattern is formulated by the well-established plane wave expansion (PWE) method. The defect cavity is engineered to resonate at ~4.17 žm in TM bandgap. The field distribution in the defect cavity has been analyzed based on two very efficient and popular schemes - perturbation correction finite difference (FD) method and finite difference time domain (FDTD) mechanism which is truncated by uniaxial perfectly matched layer (UPML) absorbing boundary condition (ABC). FD method efficiently solves Helmholtz equations to evaluate the field distribution in the semiconducting waveguide for any single spectral wavelength. The numerical results by FD method are re-established by the FDTD scheme that incorporates a precise numerical analysis within a specified wavelength range.