Julie Ann Huffman

US Patent:

20030210197, Nov 13, 2003

Filed:

May 8, 2002

Appl. No.:

10/140975

Inventors:

Thomas Cencich - Littleton CO, US
Jason Burford - Arvada CO, US
Julie Huffman - Highlands Ranch CO, US
William Kefauver - Littleton CO, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01Q013/00
H01Q001/50

US Classification:

343/786000, 343/850000

Abstract:

A ridged horn antenna that is designed to operate simultaneously in multiple modes with improved efficiency and higher gain. In one embodiment, the antenna has at least five ridges (e.g., eight ridges). Preferably, each ridge is independently fed by a feedline (e.g., coaxial cable). In order to match impedances better, the feedlines can be tapered from an uncoupled state to a highly coupled state. A beamforming network having a plurality of ports can be coupled to the feedlines. Preferably, the beamforming network is designed to provide multiple progressive phase relationships to the ridges through the coupled feedlines for simultaneous multiple operating modes.

US Patent:

20030210205, Nov 13, 2003

Filed:

May 8, 2002

Appl. No.:

10/140961

Inventors:

Thomas Cencich - Littleton CO, US
Julie Huffman - Highlands Ranch CO, US
Jason Burford - Arvada CO, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01Q001/36
H01Q021/00

US Classification:

343/895000, 343/853000

Abstract:

A spiral antenna system that is designed to have an increased upper frequency limit. The system includes a spiral antenna element having a feed end, and a helical antenna element having a helical portion electrically interconnected with the feed end of the spiral antenna element. In one embodiment, the helical antenna element comprises a coaxial cable having a portion of the outer conductor removed (e.g., tapered). For example, the helical antenna element could comprise a portion of the feedline that follows a substantially helical path. Preferably, the spiral antenna element defines a spiral axis, and the helical antenna element defines a helical axis substantially aligned with the spiral axis. The helical antenna element can be spaced from the helical axis a distance less than or equal to the radial distance of the feed end of the spiral antenna.

US Patent:

6549175, Apr 15, 2003

Filed:

Apr 4, 2001

Appl. No.:

09/826970

Inventors:

Tom Cencich - Littleton CO
Julie A. Huffman - Highlands Ranch CO
Douglas Walcher - Englewood CO

Assignee:

Lockhead Martin Corporation - Bethesda MD

International Classification:

H01Q 938

US Classification:

343830, 343700 MS, 343863

Abstract:

The present invention provides a matched mode antenna feedline desiged to achieve simultaneous modal impedance matching with a multiple mode N-fold symmetric or N-fold polygonal antenna such as, for example, spiral antennas, sinuous antennas, modulated arm width (MAW) spiral antennas, log periodic dipole (LPDA), monopole (LPMA) arrays, and an N-fold polygonal antenna. In one embodiment, the matched mode antenna feedline ( ) includes a plurality of transmission lines ( ) arranged in a circular cluster around a central axis ( ). Each transmission line ( ) extends from an input end ( ) thereof connectable with a device such as a beamformer to an output end ( ) thereof connectable with an antenna feedpoint. A transition section ( ) is provided between the input and output ends ( ) of each transmission line ( ) wherein the transmission lines ( ) are smoothly transitioned from a decoupled state proximal to the input ends ( ) thereof to a coupled state proximal to the output ends ( ) thereof.