James M Carson

US Patent:

6864837, Mar 8, 2005

Filed:

Jul 18, 2003

Appl. No.:

10/623379

Inventors:

Donald L. Runyon - Duluth GA, US
James Crawford Carson - Sugar Hill GA, US
Darin M. Janoschka - Roswell GA, US

Assignee:

EMS Technologies, INc. - Norcross GA

International Classification:

H01Q003/26

US Classification:

342372

Abstract:

A dual-polarization wireless base station antenna that implements vertical electrical downtilt and sidelobe reduction using beam steering circuit that includes a variable power divider and a multi-beam beam forming network. The variable power divider includes a single adjustable control element to divide an input voltage signal into a pair of complimentary amplitude voltage drive signals that exhibit matched phase and constant phase delay through the variable power divider. The beam forming network is configured as a double-sided, edge-connected microstrip module mounted to a main panel, which support the antenna elements in a vertical column organized into sub-arrays in a manner that implements sidelobe reduction. The power distribution network connecting the beam steering network to the antenna elements implements beam tilt bias and sidelobe reduction through coordinated phase shifting implemented through transmission media trace length adjustment.

US Patent:

20030232600, Dec 18, 2003

Filed:

Mar 17, 2003

Appl. No.:

10/390987

Inventors:

James Montgomery - Marietta GA, US
Donald Runyon - Duluth GA, US
James Carson - Sugar Hill GA, US
Bisser Dimitrov - Duluth GA, US

International Classification:

H04B001/40

US Classification:

455/067110, 455/077000, 455/562100

Abstract:

Passive intermodulation interference control circuits constructed from distributed elements of defined length and impedance segments of transmission media. The distributed elements can be combined with conventional discrete elements, such as resistors, to create a passive circuit that can be tuned to have a desired frequency response by selecting the size, length and position of the distributed elements. That is, the complete PIM interference control circuit is typically constructed from a combination of discrete and distributed elements and directly connected to or within the transmission media carrying the analog electromagnetic energy through a continuous extension of the transmission media. As such, the PIM interference control circuit can be located very close to the source of the PIM interference, such as the antenna's power divider. When strategically located in this position, the PIM circuit controls the intermodulation interference right at the source, before it enters the electronics of the receiver.

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:

60670533, May 23, 2000

Filed:

Oct 18, 1996

Appl. No.:

8/733399

Inventors:

Donald L. Runyon - Duluth GA
James E. Thompson - Lilburn GA
James C. Carson - Duluth GA

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q 2126

US Classification:

343797

Abstract:

A planar array antenna having radiating elements characterized by dual simultaneous polarization states and having substantially rotationally symmetric radiation patterns. A distribution network, which is connected to each dual polarized radiator, communicates the electromagnetic signals from and to each radiating element. A ground plane is positioned generally parallel to and spaced apart from the radiating elements by a predetermined distance. The conductive surface of the ground plane operates to image the radiating elements over a wide coverage area, thereby enabling a radiation pattern within an azimuth plane of the antenna to be independent of any quantity of radiating elements. Side walls, placed on each side of the array of radiators, can operate in tandem with the ground plane, to reduce the half-power beamwidth in the azimuth plane for a selected radiator design. A central polarization control network (PCN), which is connected to the distribution network, can control the polarization states of the received signals distributed via the distribution network by the radiating elements.