Louis W Hendrick

US Patent:

6366183, Apr 2, 2002

Filed:

Dec 9, 1999

Appl. No.:

09/458260

Inventors:

Louis W. Hendrick - Hermosa Beach CA
Robert L. Reynolds - Thousand Oaks CA
Rolf Kich - Redondo Beach CA

Assignee:

Hughes Electronics Corp. - El Segundo CA

International Classification:

H01P 120

US Classification:

333202, 333243, 333245, 333260

Abstract:

A common interface ( ) for a PIM sensitive diplexing filter ( ) is provided in a non-contacting, or isolated, configuration while providing PIM reliability, ESD conduction and thermal conduction, making it ideal for high power space applications. The common interface ( ) is a one-piece construction of a diplexed, or multiplexed, coaxial, or squareax, transmission line that is constructed with a direct non-contacting ( ), or connectionless, interface. Terminations ( ) connect the inner conductor ( ) to the outer conductor ( ) of the interface ( ) making the device one integral piece yet providing the necessary isolation through non-contacting interface with a PIM sensitive device and terminations ( ) that provide thermal and ESD conduction necessary for PIM reliablity.

US Patent:

6657521, Dec 2, 2003

Filed:

Apr 26, 2002

Appl. No.:

10/132949

Inventors:

Paul J. Tatomir - Fallbrook CA
James M. Barker - Torrance CA
Keith N. Loi - Monterey Park CA
Richard L. Bennett - Torrance CA
Louis W. Hendrick - Hermosa Beach CA
Rolf Kich - Redondo Beach CA

Assignee:

The Boeing Company - Seattle WA

International Classification:

H01P 710

US Classification:

333208, 333210

Abstract:

A microwave waveguide filter includes a main-line cavity structure with a group of at least two rectangular main-line cavities arrayed along a main propagation path and including a first main-line cavity and a second main-line cavity. Each main-line cavity includes a sidewall, and each pair of adjacent main-line cavities has a common transverse wall transverse to the main propagation path and a main-line aperture in the common transverse wall. A rectangular first feedback cavity is in microwave communication with each of the first main-line cavity and the second main-line cavity through the respective sidewall of the first main-line cavity and the second main-line cavity. There is a first-cavity feedback aperture between the first feedback cavity and the first main-line cavity, and a second-cavity feedback aperture between the first feedback cavity and the second main-line cavity. There may be additional feedback cavities as well.

US Patent:

50347110, Jul 23, 1991

Filed:

Jan 23, 1990

Appl. No.:

7/468487

Inventors:

Louis W. Hendrick - Hermosa Beach CA
David S. Levinson - Woodland Hills CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 710

US Classification:

3332191

Abstract:

A system for supporting a dielectric resonator in a circular waveguide. A dielectric resonator is held in its optimum position using support posts or rods. The support rods are made from a suitable dielectric material, and slip fitted in holes provided at 90. degree. intervals around the periphery of the dielectric resonator. The support rods are affixed to the waveguie, by gluing or being screwed in place. The support rods are slip fitted such that they are allowed to expand, due to temperature, without causing stress on the dielectric resonator, thus the dielectric resonator is held in position without being affixed to its supporting structure. This is an inexpensive and simple solution to a complex problem. The support system is self-centering and free from all stress. The support system utilizes a minimum amount of supporting material which permits realization of the best unloaded Q.

US Patent:

60258098, Feb 15, 2000

Filed:

Jul 31, 1998

Appl. No.:

9/127009

Inventors:

Steven O. Lane - Rolling Hills Estates CA
Michael J. Grall - Lawndale CA
James M. Barker - Redondo Beach CA
Louis W. Hendrick - Hermosa Beach CA

Assignee:

Hughes Electronics Corporation - Los Angeles CA

International Classification:

H01P 117

US Classification:

343772

Abstract:

A radiating element for an antenna incorporating a patch launcher, a bandpass filter and a polarizer all in one waveguide without the need for interconnecting individual components. The waveguide has at least one coaxial input having a patch launcher attached thereto. The inside diameter of the waveguide has a plurality of spaced apart irises that act as a bandpass filter followed by a plurality of spaced apart pins that act as a polarizer.

US Patent:

55348815, Jul 9, 1996

Filed:

Aug 31, 1994

Appl. No.:

8/298630

Inventors:

Frederick A. Young - Huntington Beach CA
Louis W. Hendrick - Hermosa Beach CA
Keith N. Loi - Rosemead CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01Q 330
H01P 1207
H01P 1213

US Classification:

343776

Abstract:

A microwave cavity filter (30, 30A) is formed of a section of waveguide (36, 114) terminated by end walls (38, 40, 44, 166, 168, 176) to form cavities (32, 34, 32A, 34A) wherein ridges (100, 102, 118, 120) are disposed longitudinally within a cavity and extend from the cavity wall partway to a central region (104, 124) of the cavity. In a preferred embodiment of the invention, the ridges are disposed symmetrically about a central plane (144), each ridge having a first component (106, 122) perpendicular to the central plane and a second component (108, 126) parallel to the central plane. A cross-sectional shape of a filter cavity may approximate a semicircle wherein one wall section (88, 130) of the filter cavity is disposed within a diametric plane (216) of the cavity. The end walls of the cavities may be constructed as iris plates with apertures (82, 182, 184, 186, 190) for coupling energy of selected modes of electromagnetic resonance within the respective cavities. Each cavity supports two orthogonal modes wherein, within the region, between the parallel second components of the two ridges, the electromagnetic fields of a first mode are parallel to the central plane and the electromagnetic fields of the second mode are perpendicular to the central plane.

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.

US Patent:

51573644, Oct 20, 1992

Filed:

May 22, 1991

Appl. No.:

7/712176

Inventors:

Ramona G. Pond - Downey CA
Louis W. Hendrick - Hermosa Beach CA
Craig K. Shoda - Torrance CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 1203
H01P 1205
H01P 500

US Classification:

333203

Abstract:

An airline transmission structure in a low temperature co-fired ceramic ("LTCC"). A cavity is made within the LTCC structure. Ground planes surround the cavity. Electronic processing circuitry, such as an airline filter, is suspended within the cavity. Transmission lines are provided to connect the electronic circuitry to the electronic signals (typically microwave) which require processing. Full integration of the airline filter with other electronic circuitry in a single LTCC package is also shown.

US Patent:

54283221, Jun 27, 1995

Filed:

Feb 22, 1994

Appl. No.:

8/198420

Inventors:

Louis W. Hendrick - Hermosa Beach CA
Krishnan Raghavan - Torrance CA
Craig N. Schwartz - Torrance CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 512

US Classification:

333126

Abstract:

A right angle waveguide junction for a microwave multiplexer is provided including a step in one of the waveguides for improved electrical response. A rectangular waveguide manifold (10) is coupled to a filter (12) which includes a coupling iris (14) and a circular cavity resonator (16). The circular cavity resonator is a circular waveguide with two ends closed by a metal wall. The structure of the waveguide multiplexer includes a step change (18) in the rectangular waveguide (10) height which controls the electrical response properties of the junction.