Imaging surface-acoustic fields in a longitudinal leaky wave resonator

Holmgren, O.; Knuuttila, J.V.; Makkonen, T.; Kokkonen, Kimmo; Plessky, V.P.; Steichen, W.; Solal, M.; Salomaa, M.M.

doi:10.1063/1.1849814

Cited by 19 publications

(12 citation statements)

References 8 publications

(2 reference statements)

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“…The FEM results show the resonant peak at 1535 MHz and antiresonance at 1600 MHz. This is consistent with published results for a similar structure measured by Holmgren et al [11], which show a resonance at 1540 MHz and antiresonance at 1610 MHz. The resonant peak of 1535 MHz corresponds to a propagation velocity of 6140 m/s, which is consistent with other published results for LLSAW velocity in this cut (for instance 6100 m/s [1]).…”

Section: Fe Model: Llsaw Displacement Profile and Admittancesupporting

confidence: 94%

Finite element modeling of electrode mass loading effects in longitudinal leaky SAW resonators

Klymyshyn

Kannan

Kachayev³

2008

Micro & Optical Tech Letters

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broadside direction on the radiation pattern, especially at the higher frequency band. However, the overall antenna pattern shows the unidirectional radiation to the desired target direction, which is useful for the high-directive radar imaging applications. It is observed from the simulation results that the gain of the bowtie antenna with a reflector increases from 6.5 to 8.5 dBi, almost double the case without a reflector, which gives more high directional gain to the target direction. CONCLUSIONA novel unidirectional horn-shaped tapered bowtie slot antenna with a pyramidal reflector has been designed and fabricated for ultra high-resolution radar imaging applications. The implemented antenna performance shows very low return loss less than Ϫ10 dB over 3.0 -11.7 GHz and a quasi-unidirectional radiation that shows a high front-to-back ratio over the whole UWB frequency band. This result shows enhanced new performance compared with the previously available antenna design, which will be useful for ultra high-resolution UWB radarimaging applications.

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Section: Fe Model: Llsaw Displacement Profile and Admittancesupporting

confidence: 94%

Finite element modeling of electrode mass loading effects in longitudinal leaky SAW resonators

Klymyshyn

Kannan

Kachayev³

2008

Micro & Optical Tech Letters

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“…23 However, in systems similar to that studied in the present work, substitution of the spheres by cylinders, spheroids, or scatterers of other shape would not lead to qualitatively different results although, in some cases, degeneracies that arise from the high symmetry of the sphere may be removed. We expect that the present work will open new possibilities in the design of Lamb-wave delay lines, filters and resonators, based on phononic-crystal slabs, which might be useful for acoustoelastic devices, 24 telecommunication applications, 25,26 etc.…”

Section: Discussionmentioning

confidence: 96%

Guided and quasiguided elastic waves in phononic crystal slabs

Sainidou

Stéfanou

2006

Phys. Rev. B

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Guided and quasiguided elastic waves in a glass plate coated on one side with a periodic monolayer of polymer spheres, immersed in water, are studied by means of accurate numerical calculations using the on-shell layer-multiple-scattering method. This system supports, in addition to the modes of the bare plate, almost dispersionless, slow modes which originate from the array of spheres. We calculate and analyze in detail the dispersion diagrams of the interacting modes of the composite slab, and provide a consistent interpretation of the underlying physics.

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“…Artificial structures with periodic acoustic impedance, known as phononic crystals, have been intensively studied and are already widely used in traditional kilohertz acoustics and megahertz ultrasonics for sound isolation and other applications. [1][2][3][4][5] Revolutionary "sound ideas" are widely discussed nowadays by introducing hypersonic crystals which are phononic crystals with submicrometer and nanometer period. 6 The specific acoustic properties of hypersonic crystals relate to dispersion folding and the existence of band gaps in the elastic spectrum at frequencies in the range 10 9 -10 12 Hz.…”

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confidence: 99%

Coherent elastic waves in a one-dimensional polymer hypersonic crystal

Walker

Sharp

Akimov

et al. 2010

Applied Physics Letters

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Using the methods of picosecond acoustics, we inject high amplitude hypersonic wavepackets into a polymer superlattice and optically detect the propagating coherent elastic waves. The spectrum of the optically detected signal shows the elastic modes typical for folded phonon dispersion curves. The experimental results and related modeling show the feasibility of using polymer one-dimensional hypersonic crystals as acoustic devices in the gigahertz frequency range.

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Imaging surface-acoustic fields in a longitudinal leaky wave resonator

Cited by 19 publications

References 8 publications

Finite element modeling of electrode mass loading effects in longitudinal leaky SAW resonators

Finite element modeling of electrode mass loading effects in longitudinal leaky SAW resonators

Guided and quasiguided elastic waves in phononic crystal slabs

Coherent elastic waves in a one-dimensional polymer hypersonic crystal

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