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19 Apr 2010

Volume 96, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 96, 163101 (2010); http://dx.doi.org/10.1063/1.3327831 (3 pages)

Ramesh Nath, Seungbum Hong, Jeffrey A. Klug, Alexandra Imre, Michael J. Bedzyk, Ram S. Katiyar, and Orlando Auciello
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A broadband and high-gain metamaterial microstrip antenna

Le-Wei Li, Ya-Nan Li, Tat Soon Yeo, Juan R. Mosig, and Olivier J. F. Martin

Appl. Phys. Lett. 96, 164101 (2010); http://dx.doi.org/10.1063/1.3396984 (3 pages) | Cited 9 times

Online Publication Date: 19 April 2010

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A broad bandwidth and high gain rectangular patch antenna was specifically designed in this paper using planar-patterned metamaterial concepts. Based on an ordinary patch antenna, the antenna has isolated triangle gaps and crossed strip-line gaps etched on the metal patch and ground plane, respectively. Demonstrated to have left-handed characteristics, the patterned metal patch and finite ground plane form a coupled capacitive-inductive circuit of negative index metamaterial. It is shown to have great impact on the antenna performance enhancement in terms of the bandwidth significantly broadened from a few hundred megahertz to a few gigahertz, and also in terms of high efficiency, low loss, and low voltage standing wave ratio. Experimental data show a reasonably good agreement between the simulation and measured results. This antenna has strong radiation in the horizontal direction for some specific applications within the entire band.
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84.40.Ba Antennas: theory, components and accessories
84.40.-x Radiowave and microwave (including millimeter wave) technology

Low frequency and large amplitude oscillations of cantilevers in viscous fluids

Matteo Aureli and Maurizio Porfiri

Appl. Phys. Lett. 96, 164102 (2010); http://dx.doi.org/10.1063/1.3405720 (3 pages) | Cited 10 times

Online Publication Date: 19 April 2010

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We study nonlinear vibrations of cantilever beams oscillating in viscous fluids. A handleable expression for the inertial and damping loads due to the encompassing fluid is proposed. We expand on the canonical viscous diffusion theory by incorporating vortex shedding effects at large oscillation amplitudes. Comparison with experimental results on underwater low frequency and large amplitude oscillations of cantilevers is reported. The approach is applicable to the analysis of ionic polymer metal composites vibrating underwater.
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66.10.C- Diffusion and thermal diffusion

Stacked complementary metasurfaces for ultraslow microwave metamaterials

M. Navarro-Cía, M. Aznabet, M. Beruete, F. Falcone, O. El Mrabet, M. Sorolla, and M. Essaaidi

Appl. Phys. Lett. 96, 164103 (2010); http://dx.doi.org/10.1063/1.3413958 (3 pages) | Cited 3 times

Online Publication Date: 23 April 2010

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We have experimentally realized at microwaves a dual-band ultraslow regime by constructing a metamaterial based upon the alternative stack of conventional- and complementary-split-ring-resonators-surfaces. The group delay reaches values larger than two orders of magnitude than those obtained when the electromagnetic wave propagates the same thickness in free-space. The ultraslow waves have been initially predicted by a numerical eigenmode analysis and finite-integration frequency domain simulations. Such ultraslow modes can be integrated into free-space technology for spatial delay lines, and traveling wave amplifier as well as sensors due to the enhanced interaction between different beams or radiation and matter.
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84.40.-x Radiowave and microwave (including millimeter wave) technology
02.60.-x Numerical approximation and analysis
41.20.Jb Electromagnetic wave propagation; radiowave propagation
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