Jeff W Alexander

US Patent:

59559985, Sep 21, 1999

Filed:

Jan 5, 1996

Appl. No.:

8/583707

Inventors:

Roger G. Roberts - Auburn GA
Wyman L. Williams - Duluth GA
Jeff M. Alexander - Clarkston GA

Assignee:

EMS Technologies, Inc. - Norcross GA

International Classification:

H01Q 1310

US Classification:

343768

Abstract:

A ferrite scanning line source is formed of a ferrite toroid and one or more dielectric slabs mounted to a side of the toroid. A signal propagating through the waveguide is phase shifted by the magnetization of the toroid. The further down the toroid the signal propagates the greater the phase shift that is applied to the signal. Radiators or coupling ports are formed by slots cut in a wall of the waveguide. The phase of the signal radiating from each slot in the line source is shifted from the signals emanating from the preceding and following slot in the line source. By properly locating the slots along the line source, a composite beam formed by the energy radiating from each slot may be titled (scanned) to a desired direction. In addition, the amount of phase shift applied to the signal by the waveguide depends on the magnetic state of the phase shifter. By changing the magnetic state of the phase shifter, by using a latch wire, the direction of the beam emanating from the line source can be scanned, such as by. +-. 20. degree.

US Patent:

50756486, Dec 24, 1991

Filed:

Mar 30, 1989

Appl. No.:

7/330617

Inventors:

Roger G. Roberts - Auburn GA
Jeff M. Alexander - Clarkston GA
James P. Montgomery - Roswell GA

Assignee:

Electromagnetic Sciences, Inc. - Norcross GA

International Classification:

H01P 504
H01P 5107
H01P 512

US Classification:

333128

Abstract:

A miniaturized waveguide mode ferrite RF phase shifter is efficiently transitioned to a matched impedance microstrip transmission line mode at either end to result in an ultra small, efficient and lightweight essentially "planar" phase shifter device having wide application in the microwave industry.