Bryan L Cleaveland

US Patent:

6831600, Dec 14, 2004

Filed:

Mar 23, 2004

Appl. No.:

10/806776

Inventors:

Alan Cherrette - Hermosa Beach CA
Erik Lier - Newtown PA
Bryan Cleaveland - Baldwinsville NY

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01Q 326

US Classification:

342373, 342368, 342372, 455202

Abstract:

Methods and apparatus are provided for determining aperture phase distributions for use in radiating signals with an active phased array antenna having multiple beams and multiple carriers. Distinct initial phase distributions corresponding to the carriers are allocated. The initial phase distributions are modified for each of the carriers to generate respective radiation patterns that substantially correspond to respective coverage areas in accordance with amplification and radiation of signals having the initial phase distributions. The modified phase distributions are optimized to simultaneously increase carrier-signal power and reduce an intermodulation product radiated in the respective coverage areas in accordance with amplification and radiation of signals having the modified phase distributions.

US Patent:

60782889, Jun 20, 2000

Filed:

Nov 18, 1998

Appl. No.:

9/195506

Inventors:

Stephen B. Adams - Mont Vernon NH
David D. Liu - Amherst NH
David P. Charette - Hudson NH
Brian J. Edward - Pompey NY
Bryan L. Cleaveland - Baldwinsville NY
Bruce R. Lanning - Littleton CO
Robert E. Munson - Boulder CO

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01Q 322
H01Q 1300

US Classification:

342372

Abstract:

A photonically controlled antenna array is made of a plurality of stacked light waveguides made of a material such as silicon whereon each of which one or more photonically controlled antenna elements are mounted. Light is injected into ones of the light waveguides and reflects therein until it is absorbed by the antenna elements mounted thereon due to the higher refractive index of silicon. When the photonically controlled antenna elements are illuminated they are switched to a conductive state and can transmit and receive electromagnetic signals. When no light is injected into the light waveguide the photonically controlled antenna elements are not illuminated and are in a non-conductive state wherein they cannot receive or transmit electromagnetic signals. One edge of each of the light waveguides is adjacent to a ground plane, and the antenna elements on each light waveguide are spaced from said ground plane a distance equal to a quarter wavelength at the frequency at which each of said photonically controlled antenna elements is designed to operate. The antenna elements radiate and receive signals in a direction parallel to said waveguides that is opposite to said ground plane.

US Patent:

62082930, Mar 27, 2001

Filed:

Nov 18, 1998

Appl. No.:

9/193888

Inventors:

Stephen B. Adams - Mont Vernon NH
Brian J. Edward - Pompey NY
Bryan L. Cleaveland - Baldwinsville NY

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01Q3/26;3/02;3/12;3/22

US Classification:

342368

Abstract:

A photonically controlled antenna element made of a material such as silicon is disclosed wherein one or more of such antenna elements are mounted in an array on a light waveguide made of glass or sapphire. Light is injected into the light waveguide and reflects therein until it is absorbed by the antenna elements due to the higher refractive index of silicon which makes the reflection break down, and thus allows the laser beam to leak out of the waveguide into the silicon antenna elements. When the photonically controlled antenna elements are illuminated they are switched to a conductive state and can transmit and receive electromagnetic signals. When no light is injected into the light waveguide the photonically controlled antenna elements are not illuminated and are in a non-conductive state wherein they cannot receive or transmit electromagnetic signals. A number of these light waveguides with their antenna arrays thereon may be stacked together to form a single antenna system. When the antenna elements on each light waveguide are designed to operate at different frequencies an extremely broadband antenna system is the result.

US Patent:

43920780, Jul 5, 1983

Filed:

Dec 10, 1980

Appl. No.:

6/214917

Inventors:

Milton L. Noble - Liverpool NY
Bryan L. Cleaveland - Baldwinsville NY

Assignee:

General Electric Company - Syracuse NY

International Classification:

H01J 2500

US Classification:

315 4

Abstract:

The invention relates to an electron discharge device in which radio frequency energy is generated or amplified by high speed electrons traveling in a beam along the axis of a waveguide and subjected to a periodic magnetic field. The periodic field causes the electrons to travel in periodic orbits producing electromagnetic energy. When suitably adjusted, the energy in the beam is converted into electromagnetic energy of a given frequency. The device herein disclosed has an improved magnetic structure for causing the beam to travel in a helical path and for focusing it as it pursues this path. The helical path is produced by a static, spatially circularly polarized transverse field. Focusing of the beam is achieved by a pair of similar helically disposed axial magnetic fields having mutually opposite polarization. The fields are created by a plurality of short permanent magnets with cooperating pole pieces for directing the magnetic fields into the waveguide, and disposed in four rows arranged about the perimeter of the waveguide.