Wide-Angle Absorption by the Use of a Metamaterial Plate

Lagarkov, A. N.; Kisel, V. N.; Semenenko, V. N.

doi:10.2528/pierl07111809

Cited by 47 publications

(25 citation statements)

References 7 publications

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“…Ferrites have wide applications from microwave to radio frequencies [1,2]. They possess very low conductivity, which is one of the considerations for microwave applications.…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF TIME AND TEMPERATURE ON RESISTIVITY AND MICROSTRUCTURE OF Cux Co1-x Fe2 O4 MIXED FERRITES

Bammannavar¹,

Naik²,

Pujar³

et al. 2008

PIER Letters

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Abstract-Copper-cobalt ferrites with general chemical formula Cu x Co 1−x Fe 2 O 4 (with x = 0.0, 0.4, 0.6 & 1.0) were prepared by ceramic method. The solid state reaction was confirmed by XRD patterns. DC conductivity was measured by two probe method. Electrical resistivity is found to increase on lowering of sintering temperature and time. At x = 1.0, the conduction is mainly due to hopping of electrons leading to n-type conductivity while at x = 0.0, conduction is due to holes leading to P-type conductivity. The lowest conduction at x = 0.4 is attributed to the electron hole compensation. SEM micrographs were obtained from JEOL scanning electron microscope. The micrographs reveal that an average grain size increases with sintering temperature and time as a result of decrease in porosity. This leads to the decrease in resistivity with sintering temperature and time. One of the factors for higher conductivity in ferrites is an increase in average grain size and decrease in pore concentration during the heat treatment.

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“…Ferrites have wide applications from microwave to radio frequencies [1,2]. They possess very low conductivity, which is one of the considerations for microwave applications.…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF TIME AND TEMPERATURE ON RESISTIVITY AND MICROSTRUCTURE OF Cux Co1-x Fe2 O4 MIXED FERRITES

Bammannavar¹,

Naik²,

Pujar³

et al. 2008

PIER Letters

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“…However, with the development of new materials, such as MTMs, there is a new challenging opportunity to solve this limitation. MTMs are artificial constructed materials which are engineered media having qualitatively new response functions that do not occur or may not be easily available in nature [7], which have gained increasing interest [8][9][10][11][12][13][14][15][16][17][18][19][20]. Efficient electrically small antennas have been constructed by coating a DNG or epsilon-negative (ENG) MTMs shell [8,9], which have both large overall efficiency and large FBW.…”

Section: Introductionmentioning

confidence: 99%

Efficient Electrically Small Prolate Spheroidal Antennas Coated With a Shell of Double-Negative Metamaterials

Huang¹,

Tan²

2008

PIER

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Abstract-An efficient, electrically small prolate spheroidal antenna coated with confocal double-negative (DNG) metamaterials (MTMs) shell is presented. The radiation power of this antenna-DNG shell system excited by a delta voltage across an infinitesimally narrow gap around the antenna center is obtained using the method of separation of the spheroidal scalar wave functions. Our results show that this electrically small dipole-DNG shell system has very high radiation efficiency comparing with the normal electrically small antenna due to the inductive effect of the MTMs shell that cancel with the capacitive effect of the electrically small antenna. It is found that the spheroidal shell can achieve more compact structure and higher radiated power ratio than the corresponding spherical shell. This dipole-DNG shell systems with different sizes are analyzed and discussed.

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“…In recent years, left-handed metamaterial (LHM), which possesses simultaneously negative permittivity and permeability, has attracted much attention because of its exotic electromagnetic properties and the potential applications [1][2][3][4][20][21][22][23][24][25][26][27][28][29][30]. In 2003, the behavior of wave propagation in media of which not all the principal elements of the permeability and permittivity tensors have the same sign is investigated [5].…”

Section: Introductionmentioning

confidence: 99%

Transition Behavior of K-Surface: From Hyperbola to Ellipse

Qiao¹,

Zheng²,

Zhang³

et al. 2008

PIER

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Abstract-The transition behavior of the k-surface of a lossy anisotropic indefinite slab is investigated. It is found that, if the material loss is taken into account, the k-surface does not show a sudden change from hyperbola to the ellipse when one principle element of the permittivity tensor changes from negative to positive. In fact, after introducing a small material loss, the shape of the k-surface can be a combination of a hyperbola and an ellipse, and a selective high directional transmission can be obtained in such a slab.

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Wide-Angle Absorption by the Use of a Metamaterial Plate

Cited by 47 publications

References 7 publications

INFLUENCE OF TIME AND TEMPERATURE ON RESISTIVITY AND MICROSTRUCTURE OF Cu<sub>x</sub> Co<sub>1-x</sub> Fe<sub>2</sub> O<sub>4</sub> MIXED FERRITES

INFLUENCE OF TIME AND TEMPERATURE ON RESISTIVITY AND MICROSTRUCTURE OF Cu<sub>x</sub> Co<sub>1-x</sub> Fe<sub>2</sub> O<sub>4</sub> MIXED FERRITES

Efficient Electrically Small Prolate Spheroidal Antennas Coated With a Shell of Double-Negative Metamaterials

Transition Behavior of K-Surface: From Hyperbola to Ellipse

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