David L Levinson, Age 792716 Roediger Ct, Greensboro, NC 27407

5034711, Jul 23, 1991

Jan 23, 1990

7/468487

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

Hughes Aircraft Company - Los Angeles CA

H01P 710

3332191

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.

4725797, Feb 16, 1988

Jun 1, 1987

7/058597

James D. Thompson - Manhattan Beach CA
David S. Levinson - Woodland Hills CA

Hughes Aircraft Company - Los Angeles CA

H01P 1208

333212

Circularly polarized radiation is tapped off from an input waveguide through a input iris into an entry cavity, where it is resolved into two orthogonal linearly polarized components. These respectively proceed along two discrete paths to an exit cavity. In each path six independently tunable resonances--traversed by both direct and bridge couplings--provides enough degrees of freedom for quasi-elliptic filter functions. In the exit cavity the resultants from the two paths are combined to resynthesize circularly-polarized radiation, which traverses another iris to the output waveguide. In one layout, four resonant tri-mode cavities form a rectangular array--with entry and exit cavities at diagonally opposite corners and intermediate cavities for the two discrete paths in the two remaining corners. In another layout, six dual-mode cavities form a three-dimensional array: entry and exit cavities stacked one above the other, and two intermediate two-cavity stacks for the two discrete paths adjacent the entry/exit stack.

5257872, Nov 2, 1993

May 5, 1992

7/878592

Robert Morgen - Los Angeles CA
David S. Levinson - Woodland Hills CA

Hughes Aircraft Company - Los Angeles CA

H01P 300
F16B 2100

403 30

A mechanism (100) for fixing the relative position of two members including a first member (104) having a first coefficient of thermal expansion and a second member (102) positioned adjacent to the first member and having a second coefficient of thermal expansion. The first member (104) is adapted to receive thermal energy. The first and second members are mounted for relative motion therebetween at a first temperature and are in contact at a relative fixed position at a second temperature. In a specific embodiment, a microwave control valve (100) for use in a waveguide is disclosed and includes a housing (104) having a first coefficient of thermal expansion and a first plurality of housing waveguide openings (130). A rotor (102) is positioned within the housing and has a second coefficient of thermal expansion and a plurality of rotor waveguide openings (132). The housing (104) is adapted to receive RF energy.