John Robert Glabe

US Patent:

8130167, Mar 6, 2012

Filed:

Apr 10, 2009

Appl. No.:

12/422075

Inventors:

John R. Glabe - Ramona CA, US
Andrew B. MacFarland - Beavercreek OH, US
Paul C. Kuhl - Vista CA, US
Thomas Barrett Jackson - Portland OR, US

Assignee:

COI Ceramics, Inc. - San Diego CA

International Classification:

H01Q 1/42
H01Q 1/28

US Classification:

343872, 343705

Abstract:

Radomes include an outer wall having a first average thickness and an inner wall having a second average thickness that is different from the first average thickness. At least a major portion of the inner wall is separated from at least a major portion of the outer wall by a space therebetween. The outer wall may comprise a layer of ceramic matrix composite (CMC) material. Aircraft and spacecraft include such radomes. Methods of forming radomes include forming an outer wall having a first average thickness, forming an inner wall having a different second average thickness, and coupling together the inner wall and the outer wall in such a manner as to provide a space between at least a major portion of the outer wall and at least a major portion of the inner wall.

US Patent:

54670993, Nov 14, 1995

Filed:

Nov 24, 1993

Appl. No.:

8/158057

Inventors:

Mark E. Bonebright - La Mesa CA
John R. Glabe - Ramona CA

Assignee:

McDonnell Douglas Corporation - Huntington Beach CA

International Classification:

H01Q 1310

US Classification:

343767

Abstract:

Resonant, end fire antennae that operate over broad frequency bands with a boosted gain at a preferred frequency, that can be incorporated into arrays, and that have low RF cross-sections are constructed from a transmission line, usually a piece of coaxial cable that if it is not self supporting, is mounted on or in a lightweight structural material with an outer end with a sheath or stripline the shape of half of a notch. The other half of the notch is formed from a conductor electrically connected to the center conductor of the coaxial cable. The cable and conductor are variably spaced to transition the characteristic impedance of the cable to that of free space. The transmission line and the conductor each have a quarter wavelength tuning stub connected thereto to boost the gain of the antenna at a predetermined frequency. The conductor and the sheath are terminated either with ground connections or by inductive loads.

US Patent:

58984119, Apr 27, 1999

Filed:

Oct 30, 1996

Appl. No.:

8/738459

Inventors:

Francis D. McGaffigan - Escondido CA
John Glabe - Ramona CA

Assignee:

Pacific Antenna Technologies, Inc. - San Diego CA

International Classification:

H01Q 916

US Classification:

343801

Abstract:

A single element, multi-frequency dipole antenna including two substantially equal arm sections of conductive material extending co-axially in a straight line in opposite directions from each other, each arm section being a mirror image of the other arm section throughout its entire length, each arm section including at least two contiguous shorter sub-sections of j. sub. 1, j. sub. 2,. . . j. sub. n lengths, wherein j. sub. 1 represents the length of the innermost sub-section, sub-sections terminated by discontinuities wherein j. sub. 1 represents the 1/4 wavelength of the highest resonant frequency and each consecutive-integer sequence of j sub-sections represent the 1/4 wavelength of lower resonant frequencies.

US Patent:

57481520, May 5, 1998

Filed:

Dec 27, 1994

Appl. No.:

8/365046

Inventors:

John R. Glabe - Ramona CA
Edward L. Pelton - San Diego CA

Assignee:

McDonnell Douglas Corporation - Huntington Beach CA

International Classification:

H01Q 1310

US Classification:

343767

Abstract:

A broadband flared slot notch antenna combined with an overhead metal plate resulting in an improved front-to-back ratio and a reduced response to crossed polarized radiation. The antenna is provided by a metal layer deposited on a dielectric substrate which is etched to form a pair of symmetrical slot sections having facing edges which increasingly curve away from each other to a maximum spacing point which is the antenna aperture. A linking slot interconnects the slot sections at a feed point spaced from the aperture. High frequency electrical voltage applied at the feed point achieves launch of an electromagnetic wave from the aperture. The overhead metal plate is parallel and closely spaced above and shorted to the antenna thereby reducing radiation emissions that are not in the direction of that launched from the aperture. The metal plate is shorted to the antenna along a line orthogonal and adjacent to the linking slot to prevent radiation from being launched in a direction opposite that described above. The forward edge of the metal plate is terminated with a tapered resistive card to prevent radiation scatter off the edge.

US Patent:

55681590, Oct 22, 1996

Filed:

Mar 14, 1995

Appl. No.:

8/403404

Inventors:

Edward L. Pelton - San Diego CA
John R. Glabe - Ramona CA

Assignee:

McDonnell Douglas Corporation - Huntington Beach CA

International Classification:

H01Q 1318

US Classification:

343767

Abstract:

An antenna (10) is provided by a metal layer (12) deposited on a dielectric substrate (16) which is etched to form a pair of symmetrical slot sections (20,22) having facing edges which increasingly curve away from each other to a maximum spacing point which is the antenna aperture (26). A linking slot (32) interconnects the slot sections (20,22) at a feed point (30) spaced from the aperture (26). High frequency electrical voltage applied at the feed point (30) achieves launch of an electromagnetic wave from the aperture (26). An alternative feed network uses a 180. degree. hybrid (60) providing simultaneous horizontal and vertical polarization operation.

US Patent:

54772338, Dec 19, 1995

Filed:

Dec 8, 1994

Appl. No.:

8/351628

Inventors:

Leland H. Hemming - Poway CA
John Glabe - Ramona CA
Curt Gibson - Spring Valley CA

Assignee:

McDonnell Douglas Corporation - Huntington Beach CA

International Classification:

H01Q 1310

US Classification:

343767

Abstract:

A notch antenna (10) has a metallic notch element (20) deposited on a dielectric substrate (12), which element has a smooth continuously curved edge located adjacent a substrate edge (18). A metallic ground plane (28) is located adjacent the substrate edge (18) spaced very closely to element 20 at one end and at a gradually increased spacing moving away from the one end. An electromagnetic field transmitting coaxial cable (30) with ferrite beads (44) received over its outer conductor for reducing spurious radiation is located on the opposite side of substrate (12,14). The cable center conductor (34) is connected to a metallic strip (38) that is located on the same side of substrate (12,14) as the coaxial cable and tracks the same path as the notch element (20) on the opposite side of substrate (12). The antenna (10) is fed by electromagnetic energy at the closely spaced region of the element (20) and ground plane (28).

US Patent:

58924850, Apr 6, 1999

Filed:

Feb 25, 1997

Appl. No.:

8/804637

Inventors:

John Glabe - Ramona CA
Francis D. McGaffigan - Escondido CA

Assignee:

Pacific Antenna Technologies - San Diego CA

International Classification:

H01Q 142

US Classification:

343789

Abstract:

A dual frequency feed element for a parabolic reflector antenna system, comprising a conductive cavity having a central axis, the cavity mounted at the focal point of a parabolic reflector surface and defined about its outer perimeter by an upstanding cavity wall, and having a closed cavity floor and an open top directed toward the reflective surface, a dual frequency radiating element centrally disposed in the cavity and arranged to radiate a first low frequency signal out through the cavity open top to the antenna surface, a conductive floor fixed below the radiating element a distance in relation to the radiant energy for the first low frequency signal, and disposed in the cavity transverse to the central axis thereof to reflect radiant energy for the first signal and, a frequency selective surface fixed below the radiating element, apart from the conductive floor, and transverse to the central axis of the cavity to reflect radiant energy for the second, higher frequency signal while simultaneously being invisible to the lower frequency signal.