Charles G Gilbert

US Patent:

6667724, Dec 23, 2003

Filed:

Nov 30, 2001

Appl. No.:

09/998480

Inventors:

Mark A. Barnes - Madison AL
Charles G. Gilbert - Huntsville AL
Herbert U. Fluhler - Madison AL
Hans G. Schantz - Huntsville AL
Soumya K. Nag - Huntsville AL
David M. Dickson - Huntsville AL

Assignee:

Time Domain Corporation - Huntsville AL

International Classification:

G01S 1304

US Classification:

343893, 342 27

Abstract:

An antenna array comprising a ground plane and a plurality of elements mounted thereon, said elements being capable of emitting and receiving ultra wideband emissions. Elements are arrayed on the ground plane in two parallel rows, a transmitting row, and a receiving row, such that a given element in the receiving row is aligned in at least one direction with a corresponding element in the transmitting row. Additionally, the elements are configured on the ground plane to elicit a symmetrical product response in the azimuthal plane, and to produce horizontally polarized signals. An alternative embodiment places the elements with unique inter-element spacing within the rows. An embodiment comprises a fence structure between rows. A method for use comprises the step of transmitting a signal via an element in the transmitting row and receiving said signal through an element in the receiving row, not aligned with the transmitting element.

US Patent:

6922177, Jul 26, 2005

Filed:

Feb 26, 2002

Appl. No.:

10/083689

Inventors:

Mark A. Barnes - Madison AL, US
Charles G. Gilbert - Huntsville AL, US
Herbert U. Fluhler - Madison AL, US
Hans G. Schantz - Huntsville AL, US
Soumya K. Nag - Huntsville AL, US
David M. Dickson - Huntsville AL, US

Assignee:

Time Domain Corporation - Huntsville AL

International Classification:

H01Q021/00

US Classification:

343893, 343844

Abstract:

An antenna array comprising a ground plane and a plurality of elements mounted thereon, said elements being capable of emitting and receiving ultra wideband emissions. Elements are arrayed on the ground plane in two parallel rows, a transmitting row, and a receiving row, such that a given element in the receiving row is aligned in at least one direction with a corresponding element in the transmitting row. Additionally, the elements are configured on the ground plane to elicit a symmetrical product response in the azimuthal plane, and to produce horizontally polarized signals. An alternative embodiment places the elements with unique inter-element spacing within the rows. An embodiment comprises a fence structure between rows. A method for use comprises the step of transmitting a signal via an element in the transmitting row and receiving said signal through an element in the receiving row, not aligned with the transmitting element.

US Patent:

20130241788, Sep 19, 2013

Filed:

Apr 27, 2012

Appl. No.:

13/457546

Inventors:

Joseph M. Anderson - Tucson AZ, US
Jared W. Jordan - Sahuarita AZ, US
Charles C. Gilbert - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 13/00
H01Q 13/10
H01P 11/00
H01Q 13/02

US Classification:

343771, 343772, 343786, 29600

Abstract:

Presently disclosed is an antenna system having an array of ridged waveguide Vivaldi radiator (RWVR) antenna elements fed through a corporate network of suspended air striplines (SAS). The SAS transfers the electromagnetic energy to the radiating element via the ridged waveguide coupler. The Vivaldi radiator matches the output impedance of the ridged waveguide coupler/SAS to the impedance of the surrounding medium. Because the coupling method and the radiating elements are wideband mediums, this antenna array is capable of wideband operation. The physical dimensions of the resulting array are also not as sensitive to its electrical performance as other antenna designs since the bandwidth is quite large, reducing the occurrence of an out-of-specification antenna due to manufacturing tolerance build-up. This also reduces the complexity of the manufacturing process, which in turn lowers cost.

US Patent:

20130241791, Sep 19, 2013

Filed:

Apr 27, 2012

Appl. No.:

13/457547

Inventors:

Joseph M. Anderson - Tucson AZ, US
Jared W. Jordan - Sahuarita AZ, US
Charles G. Gilbert - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 1/48

US Classification:

343848

Abstract:

Presently disclosed is an antenna system having an array of ridged waveguide Vivaldi radiator (RWVR) antenna elements fed through a corporate network of suspended air striplines (SAS) with an electromagnetic bandgap (EBG) ground plane surrounding the ridged waveguide transition. The SAS transfers the electromagnetic energy to the radiating element via the ridged waveguide coupler. The Vivaldi radiator matches the output impedance of the ridged waveguide coupler/SAS to the intrinsic impedance of the surrounding medium. The EBG, which may be comprised of a photonic bandgap material or other metamaterial, allows for better frequency and bandwidth performance in a lower-profile array package, thereby reducing size and weight of the array for applications requiring small size and or low-inertia packaging. In alternate embodiments, radiating elements other than Vivaldi radiators may be used. This configuration also reduces the complexity of the manufacturing process, which in turn lowers cost.

US Patent:

20140009346, Jan 9, 2014

Filed:

Jul 9, 2012

Appl. No.:

13/543989

Inventors:

Joseph M. Anderson - Tucson AZ, US
Herbert A. Leach - Tucson AZ, US
Charles G. Gilbert - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 19/06
H01Q 1/28

US Classification:

343705, 343833

Abstract:

A scanned radio frequency (RF) antenna having a small volume is described.

US Patent:

48434035, Jun 27, 1989

Filed:

Jul 29, 1987

Appl. No.:

7/079182

Inventors:

Farzin Lalezari - Louisville CO
Charles G. Gilbert - Louisville CO
John M. Rogers - Boulder CO

Assignee:

Ball Corporation - Muncie IN

International Classification:

H01Q 138
H01Q 1300

US Classification:

343767

Abstract:

The subject invention relates to an antenna having broadband characteristics. The antenna is a dual notch device capable of receiving or transmitting electromagnetic waves comprising a substrate, an upper planer conducting antenna element disposed on one side of the surface of said substrate and having a first curved edge, a second conducting antenna element disposed on the other side of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point therebetween with adjacent curved edges gradually tapering outwardly therefrom to define flared notches interfacing one another and interconnected by said gap.

US Patent:

60646659, May 16, 2000

Filed:

Oct 22, 1997

Appl. No.:

8/955546

Inventors:

Wayne A. Leuck - Broomfield CO
Charles G. Gilbert - Westminster CO
Ruvin I. Lerman - Eagle River AK

Assignee:

U S West, Inc. - Denver CO
MediaOne Group, Inc. - Englewood CO

International Classification:

H04B 7216

US Classification:

370335

Abstract:

CDMA (Code Division Multiple Access) communications systems and methods for performing a single to multiple frequency band conversion for mobile communications. The systems and methods include mixing a portion of a first CDMA signal in a first frequency band with a reference signal to convert a portion of the first CDMA signal to a second frequency band. The converted portion and the other portion of the first frequency band can then be transmitted. The systems and methods further include filtering a portion of a second CDMA signal having frequency components in multiple frequency bands to provide a filtered CDMA signal in the first frequency band. The filtered CDMA signal is then mixed to convert it to the second frequency band for receiver processing.

US Patent:

20170133762, May 11, 2017

Filed:

Nov 10, 2015

Appl. No.:

14/936711

Inventors:

- Waltham MA, US
Charles G. Gilbert - Tucson AZ, US
Jack H. Anderson - Tucson AZ, US
Robyn Jimenez - Vail AZ, US

Assignee:

RAYTHEON COMPANY - Waltham MA

International Classification:

H01Q 9/04
H01Q 1/42
H01Q 1/48
H01Q 1/12

Abstract:

A fixed beam ramp electromagnetic band gap (EBG) antenna including a radiating element and an electromagnetic band gap (EBG) structure both disposed within a ramped cavity. The cavity is designed with the ramp leading to the EBG structure disposed about a base of the cavity. The radiating element can be disposed above the EBG structure and the EBG structure may have a plurality of unit cells. The EBG structure can be provided both, horizontally on the floor of the cavity and vertically along a back wall of the cavity. The use of both horizontal and vertical EBG structures combined with the ramped cavity increases the bandwidth and enhances the beam steering of the antenna system.