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Wyświetlanie 1-15 z 17
Tytuł:
A New Implementation of UWB CRLH Based Antennas for Wireless Communications
Autorzy:
Alibakhshi-Kenari, M.
Naser-Mogaddasi, M.
Powiązania:
https://bibliotekanauki.pl/articles/307909.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
composite right/left-handed transmission lines
metamaterial
modern wireless communication systems
portable device
printed Q-shaped antennas
small antennas
ultra-wideband antennas
Opis:
In this article, a novel ultra wideband (UWB) small antennas based on the composite right/left-handed transmission lines structures are proposed. The antennas are pre- sented with best in size, bandwidth and radiation patterns. Their physical size and the operational frequency depend on the unit cell size and the equivalent transmission line model parameters of the CRLH-TL. To realize characteristics of frst proposed model, Q-shaped gaps printed into rectangular radiation patches are used. The antenna based on composite right/left-handed transmission lines is composed of two unit cells, each of which occupies only 10.8 x 8.6 mm and covers the 2.7{9.3 GHz bandwidth for VSWR < 2. The peak gain and radiation effciency, are 5.78 dBi and 42.1% 9.3 GHz, respectively. Moreover, the second designed antenna has the same size and enhancement bandwidth, gain and radiation effciency than the rst proposed antenna with similar design procedure. It is constructed of the printed Q-shaped four unit cells. The length, width and height are 21.6, 8.6 and 1.6 mm, respectively, and it covers 4.1{11.7 GHz bandwidth for VSWR < 2 having highest gain (7.18 dBi) and radiation effciency (92.69%) at 4.1 GHz.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 42-52
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Geometrical-Stiffening Membrane Acoustic Metamaterial with Individually Tunable Multi-Frequencies
Autorzy:
Zhao, Junjuan
Li, Xianhui
Thompson, David
Wang, Yueyue
Wang, Wenjiang
Zhu, Liying
Liu, Yunan
Powiązania:
https://bibliotekanauki.pl/articles/1953515.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
membrane acoustic metamaterial
nonlinear geometric stiffening
low frequency tuning
sound transmission
Opis:
To realize a structure which can be conveniently tuned to multiple and wideband frequency ranges, a geometrical-stiffening membrane acoustic metamaterial (MAM) with individually tunable multiple frequencies is presented. The MAM is realized by a stacked arrangement of two membrane-magnet elements, each of which has a membrane with a small piece of steel attached in the centre. It can be tuned individually by adjusting the position of its compact magnet. The normal incidence sound transmission loss of the MAM is investigated in detail by measurements in an impedance tube. The test sample results demonstrate that this structure can easily achieve a transmission loss with two peaks which can be shifted individually in a wide low-frequency range. A theoretical consideration is analysed, the analysis shows that the magnetic effect related to this distance leads to a nonlinear attractive force and, consequently, nonlinear geometrical stiffening in each membrane-magnet element, which allows the peaks to be shifted. A reasonable design can make the structure have a good application prospect for low-frequency noise insulation where there is a need to adjust the transmission loss according to the spectrum of the noise source.
Źródło:
Archives of Acoustics; 2021, 46, 1; 87-93
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibility of shaping the sound diffusion coefficient of diffusers based on acoustic metamaterials
Autorzy:
Rubacha, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2202416.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji
Opis:
The article presents the analysis of the possibilities of using acoustic metamaterial to build sound diffusers. The diffusers composed of slots loaded with a curved quarter-wave resonator were investigated. Such solutions induce dispersion and the slow sound effect to increase the effective depth of the quarter-wave resonator. The sound diffusion coefficient was calculated with the use of numerical models of diffusers. Next, obtained results were compared with the Schroeder diffuser. In conclusion, it was shown, that acoustic metamaterials affect the frequency band of the diffuser and the effectiveness of the obtained sound diffusers depend on relative width of slits.
Źródło:
Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022210
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation and experimental comparison of the deformation behavior of pantographic structures with different micro-geometry under shear and torsion
Autorzy:
Yang, Hua
Müller, Wolfgang H.
Powiązania:
https://bibliotekanauki.pl/articles/281645.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear elasticity
metamaterial
numerical simulation
Opis:
Additive manufacturing methods, commonly known as 3D printing, allow more sophisticated designs to be created. Willingly designed substructures incorporated into the solid open up new possibilities for uncommon macroscopic deformation behavior. Such a man-made structure is also referred to as a metamaterial. A detailed simulation of a polymer-based metamaterial is challenging but accurately possible by means of the theory of elasticity. In this study, we present experimental investigations of a metamaterial composed of pantographic substructures of different internal geometry. The pantographic structures show an unexpected type of deformation, which can be modeled via elasticity with the aid of direct numerical simulation by using the Finite Element (FE) method. In other words, a detailed mesh is generated involving the substructure. The metamaterial is additively manufactured out of a common polymer showing nonlinear elastic deformation and, therefore, hyperelastic material models are used. Specifically, analytical solutions of a circular cylinder are examined and compared in the case of extension and torsion in order to comprehend the effects of the coefficients inherent to the energy function of the hyperelastic model. Finally, FE computations of pantographic structures are performed and compared with the experimental measurements.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 421-434
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of tunable multichannel filter in a one-dimensional photonic crystal incorporating uniaxial metamaterial at microwave frequency
Autorzy:
Kazempour, Behnam
Powiązania:
https://bibliotekanauki.pl/articles/174347.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
uniaxial indefinite metamaterial
optical properties
multilayer design
Opis:
We proposed to design a tunable multichannel optical filter composed of uniaxial indefinite metamaterial and dielectric photonic crystal categories arrangement, which can be employed as a valuable variation of peak transmission in microwave frequency. Because of the optical axis and polarization dependence of the uniaxial metamaterial layer, the position trend in the multichannel optical filter is shown to also rely on both TE and TM polarizations. The numerical results show that by changes of the incidence angle, width of photonic band gap (PBG) compacts (widens) at TE (TM) polarization and the PBG of the structure shifts towards the higher frequency region, for both polarizations. In addition, the multichannel optical filter properties and shift trend of the PBG are also affected by changing the optical axis of the uniaxial indefinite metamaterial. Thus, results shown that without appending defect layer in this structure, the sets of comb-like resonant peaks in transmission modes can be utilized in the lower or higher band edge of PBG at TE and TM polarizations.
Źródło:
Optica Applicata; 2019, 49, 1; 13-26
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Geometric Structure, Convection, and Eddy on Sound Propagation in Acoustic Metamaterials with Turbulent Flow
Autorzy:
Pak, Myong Chol
Kim, Kwang-Il
Pak, Hak Chol
Hong, Kwon Ryong
Powiązania:
https://bibliotekanauki.pl/articles/2141704.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic metamaterial
turbulent flow
sound transmission loss
eddy
transportation
Opis:
The problem of reducing noise in transportation is an important research field to prevent accidents and to provide a civilised environment for people. A material that has recently attracted attention in research to reduce noise is acoustic metamaterial, and most of the research projects so far have been limited to the case of static media without flow. We have studied the sound transmission properties of the acoustic metamaterials with turbulent flow to develop the acoustic metamaterials that are used in transportation. In this paper, the effects of geometrical structure, convection, and eddy on sound propagation in the acoustic metamaterials with turbulent flow are investigated, and the relationships between them are analysed. The effects of convection and eddy reduce the resonant strength of the sound transmission loss resulting from the unique geometry of the acoustic metamaterials, but move the resonant frequencies to opposite directions. In addition, when the convective effect and the eddy effect of the airflow, as well as the intrinsic interaction effect generated from the unique geometrical structure of the acoustic metamaterials cannot be ignored, they exhibit competition phenomena with each other, resulting in a widening of the resonance peak. As a result, these three effects cause the shift of the resonance frequency of the sound transmission loss and the widening of the resonance peak. The results of this study show that even in the case of turbulent flow, the metamaterials can be used for transportation by properly controlling its geometric size and shape.
Źródło:
Archives of Acoustics; 2021, 46, 4; 637-647
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MIMO Antenna Design and Optimization with Enhanced Bandwidth for Wireless Applications
Autorzy:
Redd, Mekala Harinath
Sheela, D.
Powiązania:
https://bibliotekanauki.pl/articles/1839311.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
HFSS
metamaterial
mutual coupling
permittivity
reflection coefficient
Opis:
This paper demonstrates a compact MIMO (Multi Input Multi Output) fractal type antenna for ultra-wide band applications. The proposed antenna is manufactured on a lowcost substrate material and the design is analyzed for various iterations in terms of reflection coefficient, gain, and bandwidth. The 50 Ω transmission line feed is used for both fractal patches and a metamaterial structure is used as the ground plane. The proposed design achieved a wide-band frequency response between 5.8 and 15 GHz, with the reflection coefficient of less than –10 dB. Reduced mutual coupling, positive gain and stable radiation patterns were observed throughout the operating band as well. The bandwidth of 9.2 GHz is achieved with the use of a metamaterial structure on the ground plane. The ECC and diversity gain obtained prove the excellent diversity performance of the antenna. The design was simulated using HFSS software and was tested in a lab.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 4; 22-26
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Narrow transmission mode in one-dimensional symmetric defective photonic crystal containing metamaterial and high Tc superconductor
Autorzy:
Srivastava, Sanjeev K.
Aghajamali, Alireza
Powiązania:
https://bibliotekanauki.pl/articles/173630.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
photonic band gap
transmission spectra
transmission mode
defect mode
metamaterial
negative index material
superconductor photonic crystal
Opis:
We theoretically investigate the properties of narrow transmission mode (defect mode) within the reflection band in one-dimensional symmetric defective photonic crystal containing double negative metamaterial and high temperature superconductors. The transmittance spectrum of the proposed structure is obtained by using the characteristic or transfer matrix method. The results show that by increasing the thickness of air defect, transmission mode shifts towards the lower frequency side. But when the thickness of a superconductor layer is increased, transmission mode shifts towards the high frequency side. Further, the effect of temperature variation of superconducting defect on the defect mode has been investigated and found that when the temperature of superconducting layer increases the frequency of defect mode is red shifted. The shift in frequency has smaller value in the lower temperature region than in the higher temperature region, even if the change in temperature is same. Finally we have discussed the effect of variation of thickness on the defect mode by using the double negative metamaterial as defect layer in place of superconductor layer. The result shows that we get two modes for smaller thickness of double negative layer but only a single mode for larger thickness.
Źródło:
Optica Applicata; 2019, 49, 1; 37-50
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the new types of composite metamaterials
Nowy typ kompozytowych metamateriałów
Autorzy:
Tralle, Igor
Zięba, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/129556.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
negative refraction index
three-component gyromagnetic metamaterials
single-domain ferro-magnetic nanoparticles
superparamagnetism
Bruggeman approximation
ujemny współczynnik załamania
trójskładnikowy metamateriał giromagnetyczny
jednodomenowe ferromagnetyczne nanocząstki
superparamagnetyzm
przybliżenie Bruggemana
Opis:
This paper is the review of our study published in J Appl Phys 115, 233509 (2014) and J Mater Sci 53, 2034 (2018). In it, we examined the possibility of fabricating the metamaterial, which is both gyrotropic and of the simultaneously negative permittivity and permeability. Our idea was to use the three-component mixture of ingredients, where one of them is responsible for the negative effective permeability µeff of hypothetical metamaterial, while all three are responsible for the negative value of effective permittivity εeff. At first we considered the following composite: the first component was the “swarm” of single-domain ferromagnetic nanoparticles, immersed in a mixture of other two, silver and mercury cadmium telluride. Then, as fabrication of the Hg1-x Cdx Te is related to using mercury which is very poisoning, we tried to exclude this material substituting it by Pb1-x Snx Te. Additionally, taking into account that silver is relatively expensive material, we have also used Cu and Al particles as the cheaper substitute of it. We have shown by computer simulations that by the proper fitting of the parameters, e.g., the radius of nanoparticles, their magnetic moments, the relative concentration of ingredients, etc., it is possible to obtain the double-negative metamaterial, that is with negative refraction index in a relatively broad range of temperatures and magnetic fields. The last seems to be very promising in terms of practical applications of metamaterials.
Praca stanowi przegląd prac autorów, opublikowanych wcześniej (J Appl Phys 115, 233509 (2014) oraz J Mater Sci 53, 2034 (2018)). W w/w pracach autorzy zbadali możliwość utworzenia metamateriału, który byłby jednocześnie giroskopowy oraz posiadał ujemne części rzeczywiste przenikalności magnetycznej i dielektrycznej. Ideą jest wykorzystanie w tym celu mieszanki trzech składników, z których pierwszy - to "rój" ferromagnetycznych nanocząstek.
Źródło:
Physics for Economy; 2019, 3, 1; 53-65
2544-7742
2544-7750
Pojawia się w:
Physics for Economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the yield surface of a typical bending-dominant periodic lattice metamaterial
Autorzy:
Wang, Yongjun
Liu, Jinxing
Powiązania:
https://bibliotekanauki.pl/articles/2200879.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
bending-dominant periodic lattice
BDPL
yield
metamaterial
strain energy equivalence
Opis:
A theoretical method for analyzing the initial yield of a typical bending-dominant peri- odic lattice (BDPL) is established. Based on the principle of strain energy equivalence, the macroscopic effective stiffnesses of lattices are calculated. An empirical formula is employed to consider the contributions of both the axial force and bending moment. The initial yield surface of BDPL can be figured out by comparing the effective stress of each strut to the yield strength of the matrix material. The method is applicable to various BDPLs, which we believe is a helpful extension to the method for lattices comprising axial-tension bars in the literature.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 175--187
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of applications of wire medium in radio engineering means
Przegląd zastosowań konstrukcji z przewodów w urządzeniach radiowych
Autorzy:
Khobzei, M.
Vovchuk, D.
Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/407958.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
wire media
superlens
hyperlens
brush
metamaterial
struktura z przewodów
supersoczewka
hipersoczewka
struktura z losowym rozmieszczeniem przewodów
metamateriał
Opis:
This paper presents an overview of the main possible applications of wire medium in different field of radio engineering. Wire media possesses the unique electromagnetic properties. There is a number for approaches for manufacturing the wire media of different shapes from microwave frequency up to optical one. The wire media that consists of parallel metallic rods finds application for narrow and broadband power radiation in photovoltaic devices, imaging, endoscopy and many others. The wire metastructures such as hyperlens and brush are applicable to the antennas of wide frequency range.
W niniejszej pracy dokonano przeglądu głównych możliwych zastosowań struktur z przewodów w różnych dziedzinach inżynierii radiowej. Struktury z przewodów posiadają unikalne właściwości. Istnieje wiele podejść do wytwarzania struktur o różnych kształtach i zastosowaniach od zakresu częstotliwości mikrofalowych do optycznych. Struktury składające się z równoległych przewodników są wykorzystywane do transmisji fal wąskopasmowych i szerokopasmowych fal elektromagnetycznych w urządzeniach fotowoltaicznych, transferu obrazów, endoskopii i wielu innych. Konstrukcje z przewodów, takie jak hiperłącza oraz z losowym rozmieszczeniem przewodów, mogą być wykorzystywane do projektowania anten działających w szerokim zakresie częstotliwości.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 4; 32-35
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perfect absorption for modulus-near-zero acoustic metamaterial in air or underwater at low-frequency
Autorzy:
Gaafer, Fatma Nafaa
Powiązania:
https://bibliotekanauki.pl/articles/2141684.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic metamaterial
perfect absorption
Fabry-Pérot resonances
subwavelength scale
modulus-near-zero
Opis:
We theoretically propose a method to achieve an optimum absorbing material through a modulus-near-zero (MNZ) metamaterial immersed in air or water with a change in slit width part. The destructive interference has paved the way to achieve perfect absorption (PA). Depending upon theoretical analysis, an acoustic metamaterial (AMMs) that supports resonance with a monopole (140 Hz) is developed to construct a low-frequency sound-absorbing technology. The dissipative loss effect can be by attentively controlling onto slit width to achieve perfect absorption. When there are thin slit width and visco-thermal losses in the structure, it is observed that they lead to high absorption. We use finite element simulations via COMSOL Multiphysics software to theoretical measurement in impedance tube and show the influence of structural parameters in both mediums. The results are of extraordinary correspondence at low frequency to achieve optimum perfect absorption (99%). That might support AMMs to actual engineering-related applications in the process of mitigating noise, slow sound trapping, notch filtering, energy conversion, and time reversal technology.
Źródło:
Archives of Acoustics; 2022, 47, 1; 25-31
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization dependent high refractive index metamaterial with metallic dielectric grating structure in infrared band
Autorzy:
Li, Jianmin
Chen, Peng
Fang, Bo
Cai, Jinhui
Zhang, Le
Wu, Yinglai
Jing, Xufeng
Powiązania:
https://bibliotekanauki.pl/articles/2172825.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metamaterial
high refractive index
infrared band
Opis:
According to the theory of high refractive index of metamaterials, a composite structure of metal dielectric grating was designed to achieve high refractive index in infrared band. Based on the S-parameter inversion algorithm, we extracted the effective permittivity, the effective permeability, and the effective refractive index of the designed metamaterial. By changing the geometric parameters of the composite grating metamaterial structure, the effective refractive index of the designed metamaterial reaches more than 8.0 at the infrared resonance frequency. This is a high refractive index that many natural materials cannot achieve. It is noteworthy that the metamaterial structure has obvious polarization sensitivity. The metamaterial structure has both high refractive index and wideband zero refractive index properties when different polarized light is incident. At the same time, we further investigate the influence of metamaterial geometric parameters on the effective refractive index of metamaterials. Also, we propose a double grating metamaterial structure to obtain more degrees of freedom of metamaterial on the effective refractive index.
Źródło:
Optica Applicata; 2022, 52, 3; 441--460
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projecting procedure for metamaterial cylindrical waveguide
Autorzy:
Reichel, B.
Kuszner, M.
Powiązania:
https://bibliotekanauki.pl/articles/1940703.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
negative index metamaterial
nonlinearity
NLSE
Opis:
In this paper a new way of derivation of an evolution equation for short pulses in a dielectric waveguide including one model of a metamaterial waveguide is shown. This derivation model relies upon projecting to an orthogonal basis. In our case such orthogonal basis for cylindrical waveguides is chosen as Bessel functions.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 165-172
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound diffuser made of acoustic metamaterial: numerical and experimental investigation
Autorzy:
Rubacha, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2146653.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji
Opis:
The use of metamaterials in room acoustics is becoming more and more popular. Their advantage is the possibility of adjusting the parameters of the systems in the desired frequency range and the reduction of dimensions compared to the existing solutions. This paper discusses the numerical design and experimental verification of sound diffuser based on the acoustic metamaterials: a slit with added quart-wave length resonator. The transfer matrix method is used to make a numerical model of the metamaterial cell, which was used to build a model of a diffuser composed of N = 7 cells. Then, the dimensions of the diffuser were optimized to obtain the sound diffusion in a wide frequency range. The sound dispersion coefficient was also calculated using the FEM method. The numerical results were compared with the measurements and it was shown that it is possible to make a broadband sound diffuser with the use of metamaterials.
Źródło:
Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021207
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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