Ali Tassoudji

US Patent:

59908475, Nov 23, 1999

Filed:

Apr 30, 1996

Appl. No.:

8/640298

Inventors:

Daniel Filipovic - San Diego CA
Ali Tassoudji - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H01Q 136
H01Q 124

US Classification:

343895

Abstract:

A coupled multi-segment helical antenna is provided having a length that is shorter than otherwise obtainable for a conventional half-wavelength antenna. The coupled multi-segment helical antenna includes radiator portion having a plurality of helically wound radiators extending from one end of the radiator portion to the other end of the radiator portion. Each radiator is made up of a set of two or more segments. A first segment extends in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion. The second segment extends in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion, wherein a portion of the first radiator segment is in proximity with a portion of the second radiator segment such that the first and second radiator segments are electromagnetically coupled to one another.

US Patent:

61848441, Feb 6, 2001

Filed:

Mar 27, 1997

Appl. No.:

8/826289

Inventors:

Daniel Filipovic - San Diego CA
Ali Tassoudji - San Diego CA
Stephen B. Tidwell - Carlsbad CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H01Q 136
H01Q 1108

US Classification:

343895

Abstract:

A dual-band helical antenna provides operation in two frequency bands. The dual-band helical antenna includes two single-band antennas, each having a feed network, a ground plane opposite the feed network, and a set of one or more radiators extending from feed network. According to one aspect of the invention, a tab extends from the feed network of one of the antennas which provides a feed for that antenna. The tab also provides a path for current to flow from the radiators of the second antenna along the axis of the second antenna to thereby increase the energy radiated in the directions perpendicular to the axis. According to another feature of the invention, the ground plane of one antenna is used as a shorting ring for the other antenna.