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Author

David R. Smith

Other affiliations: Toyota
Bio: David R. Smith is an academic researcher from Toyota Motor Engineering & Manufacturing North America. The author has contributed to research in topics: Lens (optics) & Planar array. The author has an hindex of 1, co-authored 2 publications receiving 14 citations. Previous affiliations of David R. Smith include Toyota.

Papers
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Patent
15 May 2007
TL;DR: In this paper, a gradient index lens for microwave radiation is proposed, where a plurality of electric field coupled resonators are arranged in a planar array having spaced apart side edges and spaced apart top and bottom edges.
Abstract: A gradient index lens for microwave radiation. The lens includes a plurality of electric field coupled resonators wherein each resonator has a resonant frequency. The resonators are arranged in a planar array having spaced apart side edges and spaced apart top and bottom edges. The resonant frequency of the resonators varies between at least two of the spaced edges of the array in accordance with the desired properties of the lens.

14 citations

Patent
15 Apr 2010
TL;DR: In this article, a planaren Array with voneinander beabstandeten Seitenkanten und vone-inherited Ober-and Unter-Kanten angeordnet sind, wobei sich die Resonanzfrequenz der Resonatoren zwischen mindestens zwei beabstoodeten Kanten des arrays andert.
Abstract: Gradientenindexlinse fur Mikrowellenstrahlung umfassend: mehrere elektronische induktive kapazitive Resonatoren jeweils mit einer Resonanzfrequenz, wobei die Resonatoren in einem planaren Array mit voneinander beabstandeten Seitenkanten und voneinander beabstandeten Ober- und Unterkanten angeordnet sind, wobei sich die Resonanzfrequenz der Resonatoren zwischen mindestens zwei der voneinander beabstandeten Kanten des Arrays andert.

Cited by
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Patent
David R. Smith1, Ruopeng Liu1, Tie Jun Cui1, Qiang Cheng1, Jonah N. Gollub1 
21 Aug 2009
TL;DR: In this paper, Babinet complements of split ring resonator (SRR) and electric LC (ELC) metamaterial elements are embedded in the bounding surfaces of planar waveguides, e.g. for beam steering/focusing devices, antenna array feed structures, etc.
Abstract: Complementary metamaterial elements provide an effective permittivity and/or permeability for surface structures and/or waveguide structures. The complementary metamaterial resonant elements may include Babinet complements of "split ring resonator" (SRR) and "electric LC" (ELC) metamaterial elements. In some approaches, the complementary metamaterial elements are embedded in the bounding surfaces of planar waveguides, e.g. to implement waveguide based gradient index lenses for beam steering/focusing devices, antenna array feed structures, etc..

122 citations

Patent
David R. Smith1
15 Jan 2010
TL;DR: In this paper, a broadband interface structure is arranged to provide electromagnetic energy characteristic of an apparent profile of the back surface region substantially different than an actual profile for electromagnetic energy received at the front surface region.
Abstract: Broadband metamateriai apparatus, methods, systems, and computer readable media are disclosed, as well as exemplary embodiments that provide cloaking, beam steering, and beam focusing. In one exemplary implementation, a broadband interface structure has a front surface region and a back surface region. The broadband interface structure is arranged to provide electromagnetic energy characteristic of an apparent profile of the back surface region substantially different than an actual profile of the back surface region for electromagnetic energy received at the front surface region.

55 citations

Patent
27 Nov 2013
TL;DR: In this paper, a wave combiner and wave mode synthesizer are implemented using waveguide Mach-Zehnder modulator technology and can provide any desired linear transformation of spatial modes between its inputs and its outputs.
Abstract: Universal linear components are provided. In general, a P input and Q output wave combiner is connected to a Q input and R output wave mode synthesizer via Q amplitude and/or phase modulators. The wave combiner and wave mode synthesizer are both linear, reciprocal and lossless. The wave combiner and wave mode synthesizer can be implemented using waveguide Mach-Zehnder modulator technology. This device can provide any desired linear transformation of spatial modes between its inputs and its outputs. This capability can be generalized to any linear transformation at all by using representation converters to convert other quantities (e.g., polarization, frequency) to spatial mode patterns. The wave combiner and wave mode synthesizer are also useful separately, and can enable applications such as self-adjusting mode coupling, optimal multi-mode communication, and add-drop capability in a multi-mode system. Control of the wave combiner and wave mode synthesizer can be implemented with simple single-variable optimizations.

21 citations

Patent
30 May 2012
TL;DR: In this paper, a two-dimensional (2D) grid of capacitive patches and a first sheet layer are aligned to form a time delay circuit at each grid position of the aligned 2D grids.
Abstract: A lens is provided. The lens includes a first two-dimensional (2-D) grid of capacitive patches and a first sheet layer. The first sheet layer includes a dielectric sheet and a second 2-D grid of capacitive patches. The dielectric sheet has a front surface and a back surface. The first 2-D grid of capacitive patches is mounted directly on the back surface of the dielectric sheet, and the second 2-D grid of capacitive patches is mounted directly on the front surface of the dielectric sheet. The first 2-D grid of capacitive patches is aligned with the second 2-D grid of capacitive patches to form a time delay circuit at each grid position of the aligned 2-D grids.

14 citations

Patent
06 Oct 2010
TL;DR: In this article, a gradient index lens with no aberrations and related methods for making such lenses are described, which can be a substantially spherically-shaped lens that has at least one side that is flattened such that a locus of focal points resides on a plane.
Abstract: Gradient index lenses with no aberrations and related methods for making such lenses are described. In one aspect, a gradient index lens can be a substantially spherically-shaped lens that has at least one side that is flattened such that a locus of focal points resides on a plane. A method for making a gradient index lens can include forming material layers, each of the material layers defining an effective refractive index, and laminating the material layers together to form a substantially spherically-shaped lens having at least one side that is flattened to a substantially planar surface. The material layers can have a gradient refractive index distribution such that a locus of focal points resides on the substantially planar surface.

13 citations