James Cliffton Tillery

US Patent:

6392600, May 21, 2002

Filed:

Feb 16, 2001

Appl. No.:

09/785032

Inventors:

James C. Carson - Sugar Hill GA
James K. Tillery - Woodstock GA
Sara Phillips - Norcross GA

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q 138

US Classification:

343700MS, 343846

Abstract:

A compact antenna system can generate RF radiation fields having increased beamwidths and bandwidths. The antenna system can include one or more patch radiators separated from each other by an air dielectric and by relatively small spacer elements. The lower patch radiators can be mounted to a printed circuit board that can include an RF feed network and a ground plane which defines a plurality of symmetrically, shaped slots. The slots within the ground plane of the printed circuit board can be excited by stubs that are part of the feed network of the printed circuit board. The slots, in turn, can establish a transverse magnetic mode of RF radiation in a cavity which is disposed adjacent to the ground plane of the printed circuit board and a ground plane of the antenna system. The feed network of the printed circuit board can be aligned with portions of the cavity such that the portions of the cavity function as a heat sink for absorbing or receiving thermal energy produced by the feed network.

US Patent:

6816124, Nov 9, 2004

Filed:

Nov 6, 2002

Appl. No.:

10/289888

Inventors:

James K. Tillery - Woodstock GA

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q 2126

US Classification:

343797, 343795, 343813

Abstract:

A dual-band antenna suitable for use in a cellular telephone network base station includes two parallel arrays of low-frequency dipole elements disposed on a ground plane, a raised array of high-frequency dipole elements disposed between the two parallel arrays, and at least one beamforming rod disposed between the raised array and the two parallel arrays. The two parallel arrays operatively form symmetric azimuth radiation patterns in a lower range of frequencies. The raised array and the high frequency beamforming rod likewise operatively form symmetric azimuth radiation patterns in a higher range of frequencies. This configuration of dual-band antenna allows reception and transmission of electromagnetic signals in two discrete frequency bands while occupying a compact space.

US Patent:

6897809, May 24, 2005

Filed:

Mar 4, 2002

Appl. No.:

10/091186

Inventors:

James C. Carson - Sugar Hill GA, US
James K. Tillery - Woodstock GA, US
Sara Phillips - Norcross GA, US

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q001/38

US Classification:

343700MS, 343846

Abstract:

A compact antenna system can generate RF radiation fields having increased beamwidths and bandwidths. The antenna system can include one or more patch radiators. The lower patch radiators can be mounted to a printed circuit board that can include a ground plane which defines a plurality of slots. The slots within the ground plane of the printed circuit board can be excited by stubs that are part of the feed network of the printed circuit board. The slots, in turn, can establish RF radiation in a cavity which is disposed adjacent to the ground plane of the printed circuit board and a ground plane of the antenna system.

US Patent:

6947008, Sep 20, 2005

Filed:

Jan 31, 2003

Appl. No.:

10/355114

Inventors:

James Tillery - Woodstock GA, US
Donald L. Runyon - Duluth GA, US

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q021/08

US Classification:

343824, 343853, 343893

Abstract:

A low-cost antenna array and method of manufacturing the array, in a planar form or in a structurally flexible or curved array structure are shown. The antenna array has a plurality of metallic antenna electrical and radiator elements formed on a foam core layer bonded onto a metallic ground layer. The radiator elements preferably are formed on a thin dielectric carrier layer bonded to the foam core layer. The array can include one or more additional dielectric layers, each with a plurality of parasitic radiator elements formed thereon, mounted on top of the electrical elements. Manufacturing the array preferably includes bonding the layers to one another. The electrical and radiator elements are formed, preferably by etching, before the foam core layer is bonded to the ground layer. The additional dielectric layer and the parasitic radiators then are bonded to the already formed electrical elements on the ground layer.

US Patent:

7616168, Nov 10, 2009

Filed:

Aug 28, 2006

Appl. No.:

11/467603

Inventors:

James K. Tillery - Woodstock GA, US

Assignee:

Andrew LLC - Hickory NC

International Classification:

H01Q 21/26

US Classification:

343797, 343798

Abstract:

A method and system for increasing an isolation characteristic of a crossed dipole pair, dual polarized antenna can include a feedback system comprising a feedback element for generating a feedback signal in response to a transmitted RF signal produced by each radiating elements of a crossed dipole pair, dual polarized antenna. The feedback element may improve the isolation characteristic of RF signals between two different polarizations. The dimensions and spacing of the feedback element relative to an antenna may provide for optimal feedback signals. The feedback element can have a length, width, and thickness wherein the length and width are usually larger than the thickness dimension. A fastening mechanism of the inventive feedback system for coupling the feedback element to the antenna can include materials that allow for high speed production of antenna arrays using with the feedback system.

US Patent:

20050253669, Nov 17, 2005

Filed:

May 2, 2005

Appl. No.:

11/120149

Inventors:

James Tillery - Woodstock GA, US

International Classification:

H01P001/18

US Classification:

333161000, 333033000

Abstract:

A tuneable antenna system and method is disclosed. The system includes a transmission line coupled to an antenna, the transmission line having a movable portion, wherein a first position of the movable portion provides to the transmission line a first path length different from a second path length at a second position of the movable portion and at least first and second tuner, wherein a coupling of the first tuner to the movable portion at the first position presents to the transmission line a first impedance, and wherein a coupling of the second tuner to the movable portion at the second position presents to the transmission line a second impedance different from the first impedance.

US Patent:

20070008236, Jan 11, 2007

Filed:

Jul 6, 2006

Appl. No.:

11/481490

Inventors:

James Tillery - Woodstock GA, US
James Carson - Sugar Hill GA, US
Donald Runyon - Duluth GA, US

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q 21/26

US Classification:

343797000, 343810000

Abstract:

A communication system can comprise an ordered arrangement or array of two sets, groups, or groups of antenna elements. The system can transmit or receive two bands or ranges of electromagnetic energy, signals, or radiation. The first set of the antenna elements can operate one of the bands, while the second set can operate the other band. The first set of antenna elements can be arranged or disposed to form a line or a column. The second set of antenna elements can be arranged or disposed on opposite sides of the line, with some of those elements on one side of the line and the remainder on the other side. The antenna elements that are on one side of the line can be staggered or longitudinally offset with respect to the antenna elements that are on the opposite side of the line.

US Patent:

61374539, Oct 24, 2000

Filed:

Nov 19, 1998

Appl. No.:

9/197325

Inventors:

Johnson J. H. Wang - Marietta GA
James K. Tillery - Woodstock GA

Assignee:

Wang Electro-Opto Corporation - Marietta GA

International Classification:

H01Q 136

US Classification:

343895

Abstract:

Disclosed is a broadband, miniaturized, slow-wave antenna for transmitting and receiving radio frequency (RF) signals. The slow-wave antenna comprises a dielectric substrate with a traveling wave structure mounted on one surface, and a conductive surface member mounted on the opposite surface. The traveling wave structure, for example, is of the broadband planar type such as various types of spirals and includes conductive arms which are coupled to feed lines which are routed through the dielectric substrate and the conductive surface member for connection to a transmitter or receiver. The dielectric substrate is of a predetermined thickness which is, for example, less than 0. 04. lambda. sub. 1, where. lambda. sub. 1 is the free space wavelength of the lowest frequency f. sub.