Autor: Marciniak, Ł. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Optimum-efficiency Beam Multiplier for an Arbitrary Number of Output Beams and Power Distribution
Autorzy:: Frezza, F.
Marciniak, M.
Pajewski, L.
Powiązania:: https://bibliotekanauki.pl/articles/308318.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: beam multipliers
diffractive optical elements
grating
periodic structures
Opis:: This paper deals with phase gratings working in the paraxial domain. The profile of the optimum-efficiency beam multiplier with an arbitrary number of output diffraction orders is derived in an analytic form by exploiting methods from the calculus of variation. The output beams may be equi-intense or with arbitrary distribution of power. Numerical examples are given for different values of the number of output beams.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 3; 94-98
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Multi-Objective Evolutionary Optimization of Aperiodic Symmetrical Linear Arrays
Autorzy:: Napoli, F.
Pajewski, L.
Vescovo, R.
Marciniak, M.
Powiązania:: https://bibliotekanauki.pl/articles/308614.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: antenna array
Dolph-Chebyshev array
genetic algorithms
Opis:: In this paper, a multi-objective approach is applied to the design of aperiodic linear arrays of antennas. The adopted procedure is based on a standard Matlab implementation of the Controlled Elitist Non-Dominated Sorting Genetic Algorithm II. Broadside symmetrical arrays of isotropic radiators are considered with both uniform and non-uniform excitations. The work focuses on whether, and in which design conditions, the aperiodic solutions obtained by the adopted standard multi-objective evolutionary procedure can approximate or outperform the Pareto-optimal front for the uniformspacing case computable by the Dolph-Chebyshev method.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 3; 79-87
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Enhancement of Air-ground Matching by Means of a Chirped Multilayer Structure: Electromagnetic Modeling with the Method of Single Expression
Autorzy:: Baghdasaryan, H.
Knyazyan, T.
Hovhannisyan, T.
Marciniak, M.
Pajewski, L.
Powiązania:: https://bibliotekanauki.pl/articles/958078.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: chirped multilayer structure
ground matching
method of single expression
Opis:: The enhancement of air-ground electromagneticmatching by means of a chirped multilayer structure is inves-tigated. The modeling and simulation of the considered struc-ture are performed by using the method of single expression(MSE), which is a convenient and accurate tool for wavelength-scale simulations of multilayers comprising lossy, amplifyingor nonlinear (Kerr-type) materials. Numerical results showthat a suitable chirped multilayer structure can reduce the re- ection from the ground. Different values of the number oflayers and of the layer thicknesses are considered. The distributions of the electric eld components and the power owdensity within the modelled structures are calculated.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 3; 30-36
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental Analysis of a Directive Antenna with a 3D-EBG Superstrate
Autorzy:: Pajewski, L.
Frezza, F.
Marciniak, M.
Piuzzi, E.
Rossi, G. V.
Powiązania:: https://bibliotekanauki.pl/articles/307787.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: directivity enhancement
electromagnetic bandgap materials
Fabry-Perot cavities
periodic structures
woodpile
Opis:: A three-dimensional electromagnetic crystal is employed as a directivity-enhancing superstrate for planar antennas. The crystal is a woodpile made of alumina rods. In a shielded anechoic chamber, the performance of a patch antenna covered with the woodpile is measured. The superstrate is positioned at different distances from the antenna and its orientation is varied in the 8–12 GHz frequency range. The return loss, gain and radiation pattern in the E- and H-planes are measured. The electromagnetic behavior of Fabry-Perot cavities with woodpile mirrors, equivalent to the compound radiator, is also studied. The main effect of the crystal on the antenna performance is an enhancement of about 10 dB in maximum gain. A rather complete series of experiments is presented, highlighting the role of the periodic structure in the directivity enhancement and allowing a deeper understanding of the electromagnetic phenomena involved in EBG resonator antennas. Benefits and disadvantages of this kind of antennas are discussed and ideas for future research are given.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 3; 113-124
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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