Joseph D Elliott

US Patent:

47806931, Oct 25, 1988

Filed:

Nov 12, 1986

Appl. No.:

6/929459

Inventors:

Joseph A. Elliott - Los Angeles CA
Rolf Kich - Redondo Beach CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 1207
H01P 1213

US Classification:

333135

Abstract:

A probe coupled waveguide multiplexer is provided including a first waveguide which serves as a multiplexing manifold; a second waveguide, having a cavity, typically a filter, which is probe coupled to the first waveguide; and a third waveguide which has a cavity and is probe coupled to the first waveguide such that the probe of said third waveguide is diametrically opposed to the probe of said second waveguide and the second and third waveguides are mounted in the same transverse plane in co-planar relation. The probe coupling method and apparatus disclosed herein allows the waveguide filters to be mounted on the manifold in a close physical relation thereby minimizing the length of the manifold and associated costs.

US Patent:

47219335, Jan 26, 1988

Filed:

Sep 2, 1986

Appl. No.:

6/902810

Inventors:

Craig Schwartz - Lawndale CA
Louis Hendrick - Hermosa Beach CA
Joseph Elliott - Los Angeles CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 1208
H01P 706

US Classification:

333212

Abstract:

A dual mode circular-type waveguide filter (10) has a cylindrical waveguide body (12) separated by septums (16, 18) into a plurality of resonant waveguide cavities (22, 24, 26). Mutually orthogonal electromagnetic fields (37, 81) in adjacent cavities (24, 26) are electromagnetically coupled with each other by an internal coupling element (60) which is mounted on one of the septums (18) and extends into the adjacent cavities. The coupling element comprises an elongate, conductive wire which includes a first portion (62) extending into one of the cavities and forming a magnetic loop, and a second portion (64) extending into the adjacent cavity and forming an electric probe. The coupling element provides an asymmetrical stopband pole (72a) in the frequency response (70) of the filter.