Rodney D Mitchell

US Patent:

49030370, Feb 20, 1990

Filed:

Oct 2, 1987

Appl. No.:

7/105135

Inventors:

Rodney A. Mitchell - Tujunga CA
Gerry B. Blachley - Simi Valley CA

Assignee:

Antenna Downlink, Inc. - Simi Valley CA

International Classification:

H01Q 1302

US Classification:

343756

Abstract:

A dual frequency feed assembly for antenna systems employing a pair of rotatably mounted probes each in respective coaxial cavities. The smaller cavity is supported by the rotating means for the larger probe and the smaller probe rotates with the larger probe driven by a common motor. The higher frequency signal is taken from the side wall of the lower frequency cavity. In an alternate embodiment, the smaller cavity is supported by a spider which rotates the smaller probe by means of external gearing and a separate motor. Other embodiments show coaxial lines which enter from the front face of the assembly and allow rotation of the smaller probe.

US Patent:

51072742, Apr 21, 1992

Filed:

Sep 11, 1989

Appl. No.:

7/405548

Inventors:

Rodney A. Mitchell - Tujunga CA
Gerry B. Blachley - Simi Valley CA

Assignee:

National ADL Enterprises - Simi Valley CA

International Classification:

H01Q 1302

US Classification:

343756

Abstract:

A dual frequency feed assembly for an antenna system having two coaxial cavities, with a smaller, high-frequency cavity mounted coaxially within a larger, low-frequency cavity. A separately rotatable probe is mounted within each cavity. The smaller cavity is mounted within the larger cavity by any of several structures, such as a ring-shaped spider, a ring-shaped spacer in the form of a planar washer, or a harp extending rearwardly in the larger cavity.

US Patent:

52550036, Oct 19, 1993

Filed:

Mar 19, 1992

Appl. No.:

7/854548

Inventors:

Rodney A. Mitchell - Tujunga CA
Gerry B. Blachley - Simi Valley CA

Assignee:

Antenna Downlink, inc. - Simi Valley CA

International Classification:

H01Q 1302

US Classification:

343756

Abstract:

A multiple-frequency feed assembly for an antenna system having two coaxial cavities, with a smaller, high-frequency cavity mounted coaxially within a larger, low-frequency cavity. A separate rotatable probe is mounted within each cavity. The smaller cavity is mounted within the larger cavity by any of several structures, such as a ring-shaped spider, a ring-shaped spacer in the form of a planar washer, or a harp extending rearwardly in the larger cavity. In all of the embodiments, a continuous, uninterrupted signal path is provided within the low-frequency cavity, around the high-frequency cavity, for conveying incident electromagnetic signals to the low-frequency probe mounted at the rear of the low-frequency cavity. In other embodiments, the feed assembly is adapted to detect incident electromagnetic signals in a third band of frequencies, lower than the low-frequency band, using a third probe located within the low-frequency cavity, immediately adjacent to the high-frequency cavity. This third probe preferably is aligned circumferentially with a conductor for conducting the detected high-frequency signal from the high-frequency probe to the exterior of the feed assembly.