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Patent

Metamaterials for controlling and guiding electromagnetic radiation and applications therefor

TL;DR: A linear metamaterial comprises a transmission line, having a linear dimension, and is loaded with capacitors, and shunted with an inductor such that for an electromagnetic wave having a wavelength greater than the linear dimension and traveling along the axis of the transmission line is simultaneously negative as discussed by the authors.
Abstract: A linear metamaterial comprises a transmission line, having a linear dimension, and is loaded with capacitors, and shunted with an inductor such that for an electromagnetic wave, having a wavelength greater than the linear dimension and traveling along the axis of the transmission line, the effective permeability and permittivity of the metamaterial are simultaneously negative. Applications for the metameterial are also disclosed.
Citations
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Patent
17 Mar 2008
TL;DR: In this article, the authors present an approach for using composite left and right handed (CRLH) metamaterial (MTM) structure antenna elements and arrays to provide radiation pattern shaping and beam switching.
Abstract: Apparatus, systems and techniques for using composite left and right handed (CRLH) metamaterial (MTM) structure antenna elements and arrays to provide radiation pattern shaping and beam switching.

396 citations

Journal ArticleDOI
TL;DR: In this paper, the ridge gap waveguide is used to verify the large bandwidth and low losses of the quasi-transverse electromagnetic (TEM) mode propagating along the guiding ridge.
Abstract: This study describes the design and experimental verification of the ridge gap waveguide, appearing in the gap between parallel metal plates. One of the plates has a texture in the form of a wave-guiding metal ridge surrounded by metal posts. The latter posts, referred to as a pin surface or bed of nails, are designed to give a stopband for the normal parallel-plate modes between 10 and 23 GHz. The hardware demonstrator includes two 90 bends and two capacitive coupled coaxial transitions enabling measurements with a vector network analyser (VNA). The measured results verify the large bandwidth and low losses of the quasi-transverse electromagnetic (TEM) mode propagating along the guiding ridge, and that 90 bends can be designed in the same way as for microstrip lines. The demonstrator is designed for use around 15 GHz. Still, the ridge gap waveguide is more advantageous for frequencies above 30 GHz, because it can be realised entirely from metal using milling or moulding, and there are no requirements for conducting joints between the two plates that otherwise is a problem when realising conventional hollow waveguides.

377 citations

Patent
24 Aug 2007
TL;DR: In this paper, the authors describe a set of techniques, apparatus and systems that use one or more composite left and right handed (CRLH) metamaterial structures in processing and handling electromagnetic wave signals.
Abstract: Techniques, apparatus and systems that use one or more composite left and right handed (CRLH) metamaterial structures in processing and handling electromagnetic wave signals. Antennas and antenna arrays based on enhanced CRLH metamaterial structures are configured to provide broadband resonances for various multi-band wireless communications.

302 citations

Patent
Carsten Metz1
08 Mar 2004
TL;DR: In this article, an efficient, low-loss, low sidelobe, high dynamic range phased-array radar antenna system was proposed that uses metamaterials, which are manmade composite materials having a negative index of refraction, to create a biconcave lens architecture.
Abstract: An efficient, low-loss, low sidelobe, high dynamic range phased-array radar antenna system is disclosed that uses metamaterials, which are manmade composite materials having a negative index of refraction, to create a biconcave lens architecture (instead of the aforementioned biconvex lens) for focusing the microwaves transmitted by the antenna. Accordingly, the sidelobes of the antenna are reduced. Attenuation across microstrip transmission lines may be reduced by using low loss transmission lines that are suspended above a ground plane a predetermined distance in a way such they are not in contact with a solid substrate. By suspending the microstrip transmission lines in this manner, dielectric signal loss is reduced significantly, thus resulting in a less-attenuated signal at its destination.

243 citations

Patent
27 Apr 2007
TL;DR: In this article, left and right handed (CRLH) metamaterial structures have been used in wireless communication RF front-end and antenna sub-systems for processing and handling electromagnetic wave signals.
Abstract: Techniques, apparatus and systems that use one or more composite left and right handed (CRLH) metamaterial structures in processing and handling electromagnetic wave signals. Antenna, antenna arrays and other RF devices can be formed based on CRLH metamaterial structures. The described CRLH metamaterial structures can be used in wireless communication RF front-end and antenna sub-systems.

242 citations

References
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Patent
12 Jun 2003
TL;DR: In this paper, a circuit for processing radio frequency signals can be placed on a substrate where the circuit can be coupled with a directional coupler and at least one ground, and the dielectric layer can include a first region (102) with a first set of substrate properties and a second region (104), with a second set of surface properties.
Abstract: A circuit for processing radio frequency signals. The circuit includes a substrate where the circuit can be placed. The substrate can be a meta material and can incorporate at least one dielectric layer (100). A directional coupler (106) and at least one ground (112) can be coupled to the substrate. The dielectric layer can include a first region (102) with a first set of substrate properties and a second region (104) with a second set of substrate properties. The substrate properties can include a permittivity and a permeability. A substantial portion of the directional coupler (106) can be coupled to the second region (104). The permittivity and/or permeability of the second region (104) can be higher than the permittivity and/or permeability of the first region (102). The increased permittivities and/or permeabilities can reduce a size of the directional coupler (106) and effect a charge in a variety of electrical characteristics associated with the directional coupler (106).

25 citations