Frederick C Young

US Patent:

44881304, Dec 11, 1984

Filed:

Feb 24, 1983

Appl. No.:

6/469498

Inventors:

Frederick A. Young - Huntington Beach CA
Robert J. Ahulii - Hawthorne CA
Roy K. Rikimaru - Los Angeles CA

Assignee:

Hughes Aircraft Company - El Segundo CA

International Classification:

H01P 1205
H01P 1203

US Classification:

333203

Abstract:

The present invention provides an improved microwave integrated circuit filter for electromagnetic waves. The filter includes a waveguide and three, four or more resonators spaced from one another and extending from the waveguide. Means, which may include a conductive ribbon, are provided electromagnetically coupling nonadjacent resonators.

US Patent:

44108656, Oct 18, 1983

Filed:

Feb 24, 1982

Appl. No.:

6/351811

Inventors:

Frederick A. Young - Huntington Beach CA
Edward L. Griffin - Huntington Beach CA

Assignee:

Hughes Aircraft Company - El Segundo CA

International Classification:

H01P 1208
H01P 706

US Classification:

333208

Abstract:

A tri-mode spherical cavity microwave filter comprising two tandemly disposed generally spherical bodies each of which defines a spherical cavity which supports three identical, mutually orthogonal modes of electromagnetic energy, a cavity coupling aperture connecting the cavities, a plurality of cavity tuning holes, and a plurality of coupling tuning holes. One of the spherical cavities has an input aperture, and another has an output aperture. The cavity tuning holes and coupling tuning holes are adapted to receive cavity tuners and coupling tuners, respectively.

US Patent:

50122118, Apr 30, 1991

Filed:

Sep 2, 1987

Appl. No.:

7/092347

Inventors:

Frederick A. Young - Huntington Beach CA
Roy K. Rikimaru - Los Angeles CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01P 1208

US Classification:

333212

Abstract:

A microwave filter is composed of a set of circular cylindrical cavities arranged in cascade array and interconnected by irises having cross-slotted apertures for coupling electromagnetic power in two orthogonal TE. sub. 113 modes. An input port is formed in a first of the cavities and an output port is formed in a last of the cavities. Each port is constructed as a transition between a section of rectangular waveguide and a section of circular waveguide, the section of circular waveguide being a portion of the first cavity and the last cavity, respectively, in the input and the output ports. The cross-sectional aspect ratio of the rectangular waveguide is 2:1. The ratio of a diameter of the cavity to length, as measured along a cylindrical axis in each cavity, is 0. 26 thereby to provide for increased bandwidth while minimizing dispersion and transmission loss.

US Patent:

42912873, Sep 22, 1981

Filed:

Dec 10, 1979

Appl. No.:

6/101592

Inventors:

Frederick A. Young - Huntington Beach CA
Edward L. Griffin - Huntington Beach CA

Assignee:

Hughes Aircraft Company - Culver City CA

International Classification:

H01P 1219
H01P 1208

US Classification:

333210

Abstract:

There are herein described evanescent mode filters each of which include a hollow waveguide, wherein a plurality of resonators are disposed, the resonators including loading structures such as tuning screws, for example, wherein at least one of the loading structures is angularly disposed, relative to the axis of the waveguide, with respect to others of the loading structures to reduce the length of the filter and/or to provide internal bridge couplings.

US Patent:

42727693, Jun 9, 1981

Filed:

Aug 27, 1979

Appl. No.:

6/069968

Inventors:

Frederick A. Young - Huntington Beach CA
Willard V. T. Rusch - Pasadena CA

International Classification:

H01Q 1914

US Classification:

343781P

Abstract:

A conical scan microwave antenna having a stationary fixed axially symmetric primary reflector consisting of any concave surface of revolution along with a spherical wave point source feed-and-subreflector assembly potentially rotatable about the axis of the primary reflector, and with the surface of the subreflecror being shaped so that the reflection of the spherical wave from the feed and off of the subreflector strikes the primary antenna and is reflected as a co-planar wavefront from every point on the primary reflector, and, further, the subreflector-and-feed assembly is located outside of the aperture of the reflected pencil beam such that for any given scan position of the subreflector, no portion of the reflected wavefront intersects the subreflector or its feed.

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:

56990294, Dec 16, 1997

Filed:

Apr 30, 1996

Appl. No.:

8/637967

Inventors:

Frederick A. Young - Huntington Beach CA
Keith N. Loi - Rosemead CA
Richard L. Bennett - Torrance CA

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

H01P 1208
H01P 1213

US Classification:

333212

Abstract:

A high performance bandpass filter is produced by adding one or more "simultaneous couplings" to a conventional resonant cavity filter. A "simultaneous coupling" is created when a filter's input or output signal, normally coupled to a filter's first or last cavity respectively, is coupled to one or more other cavities. Each simultaneous coupling causes a finite-frequency insertion loss pole to be created, which produces a quasi-elliptic frequency response on its side of the passband. These poles may be placed on the left and/or right sides of the passband, so that both symmetric and asymmetric quasi-elliptic frequency responses are realizable. A diplexer constructed from two such bandpass filters has the extremely sharp selectivity provided by two asymmetric bandpass filters, thus providing a high degree of receive/transmit isolation.

US Patent:

57606676, Jun 2, 1998

Filed:

Jul 12, 1995

Appl. No.:

8/501595

Inventors:

Frederick A. Young - Huntington Beach CA
Richard L. Bennett - Torrance CA
Keith N. Loi - Rosemead CA

Assignee:

Hughes Aircraft Co. - Los Angeles CA

International Classification:

H01P 1208
H01P 706

US Classification:

333212

Abstract:

A bandpass filter having 4-degrees of freedom includes a plurality of resonant cavities having respective Qs where at least one of the Qs is different. A plurality of main couplings couple successive resonant cavities to establish a main signal path that provides a first degree of freedom for controlling the shape of the filter's frequency response over its passband. A plurality of bridge couplings couple pairs of the resonant cavities so that the cavities are connected in a canonical circuit topology. The bridge couplings provide second and third degrees of freedom for controlling the sharpness of the frequency response 's transition between its passband and stopband and controlling the linearity of its phase, respectively. The cavities' non-uniform Qs provide a fourth degree of freedom for controlling the amplitude of the filter's frequency response in the passband so that the amplitude is within a predetermined tolerance of a desired passband shape.