Patents by Inventor George V. Eleftheriades

George V. Eleftheriades has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8013316
    Abstract: A method and apparatus for near-field focusing of an incident wave, over a range of frequencies from microwaves to optical frequencies, into a sub-wavelength spot having a peak-to-null beamwidth of ?/10. The screen may be made out of closely spaced, unequal slots cut on a metallic sheet. Nano-scale focusing capability may be achieved with a simple structure of three slots on a metallic sheet, which can be readily implemented using current nanofabrication technologies. Unlike negative-refractive-index focusing implementations, this “meta-screen” does not suffer from image degradation when losses are introduced and is easily scalable from microwave to Terahertz frequencies and beyond. The slotted geometry is designed using a theory of shifted beams to determine the necessary weighting factors for each slot element, which are then converted to appropriate slot dimensions.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: September 6, 2011
    Inventor: George V. Eleftheriades
  • Patent number: 7777594
    Abstract: For the cost effective implementation of negative-index refraction, an anisotropic hyperbolic planar metamaterial is provided. The material has a first set of substantially parallel, unloaded and coplanar transmission lines that are spaced with a periodicity dy. It has a second set of substantially parallel, unloaded and coplanar transmission lines that are spaced with a periodicity dx and are coplanar and substantially orthogonal with the first set of transmission lines. The periodicities of the first set and second set of transmission lines are governed by the relationship ?x(fr)dx+?y(fr)dy=2?, where: ?x and ?y are the intrinsic propagation constants of electromagnetic waves of frequency fr propagating along the first and second set of transmission lines, respectively.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: August 17, 2010
    Assignee: Ontario Centres of Excellence Inc.
    Inventor: George V. Eleftheriades
  • Publication number: 20090230333
    Abstract: A method and apparatus for near-field focusing of an incident wave, over a range of frequencies from microwaves to optical frequencies, into a sub-wavelength spot having a peak-to-null beamwidth of ?/10. The screen may be made out of closely spaced, unequal slots cut on a metallic sheet. Nano-scale focusing capability may be achieved with a simple structure of three slots on a metallic sheet, which can be readily implemented using current nanofabrication technologies. Unlike negative-refractive-index focusing implementations, this “meta-screen” does not suffer from image degradation when losses are introduced and is easily scalable from microwave to Terahertz frequencies and beyond. The slotted geometry is designed using a theory of shifted beams to determine the necessary weighting factors for each slot clement, which are then converted to appropriate slot dimensions.
    Type: Application
    Filed: December 4, 2008
    Publication date: September 17, 2009
    Inventor: George V. Eleftheriades
  • Publication number: 20080204164
    Abstract: For the cost effective implementation of negative-index refraction, an anisotropic hyperbolic planar metamaterial comprising a first set of substantially parallel, unloaded and coplanar transmission lines, said first set being spaced with a periodicity dy a second set of substantially parallel, unloaded and coplanar transmission lines, said second set being spaced with a periodicity dx, further being coplanar and substantially orthogonal with said first set of transmission lines, wherein the periodicities of said first set and second set of transmission lines being governed by the relationship ?x(fr)dx+?y(fr)dy=2?, where: ?x and ?y are the intrinsic propagation constants of electromagnetic waves of frequency fr propagating along the first and second set of transmission lines, respectively.
    Type: Application
    Filed: August 9, 2005
    Publication date: August 28, 2008
    Applicant: ONTARIO CENTRES OF EXCELLENCE INC.
    Inventor: George V. Eleftheriades
  • Patent number: 6859114
    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.
    Type: Grant
    Filed: June 2, 2003
    Date of Patent: February 22, 2005
    Inventors: George V. Eleftheriades, Keith G. Balmain
  • Publication number: 20040066251
    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.
    Type: Application
    Filed: June 2, 2003
    Publication date: April 8, 2004
    Inventors: George V. Eleftheriades, Keith G. Balmain
  • Publication number: 20020185310
    Abstract: Printed circuit boards with relatively high line speeds (for example, about one giga bit per second and above) are increasingly being developed. However, at these high line speeds problems arise with via-induced spurious modes being generated and propagating and reflecting along power or ground planes within the printed circuit board. This is problematic because any active devices which reference power or ground during the presence of such a spurious mode experience a change in the reference potential. This can lead to incorrect data reception or transmission. A resistive coating is applied to the edge of a printed circuit board, directly connected to the ground planes and capacitively connected to the power planes. This resistive coating acts to absorb spurious modes and prevent these from reflecting. In addition, the capacitive connection between the power planes and the resistive coating is enhanced, for example, using metallic flanges.
    Type: Application
    Filed: June 7, 2001
    Publication date: December 12, 2002
    Inventors: John J. Williamson, Kalvin W. Korpela, George V. Eleftheriades