Clifton S Quan

US Patent:

6362703, Mar 26, 2002

Filed:

Jan 13, 2000

Appl. No.:

09/482587

Inventors:

Timothy D. Keesey - Garden Grove CA
Clifton Quan - Arcadia CA
Douglas A. Hubbard - West Hills CA
David E. Roberts - San Pedro CA
Chris E. Schutzenberger - Seal Beach CA
Raymond C. Tugwell - Simi Valley CA
Gerald A. Cox - Playa Del Rey CA
Stephen R. Kerner - Culver City CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 104

US Classification:

333 33, 333243, 333260

Abstract:

An RF interconnect between a rectangular coaxial transmission line including a coaxial center conductor and a dielectric structure with a rectilinear cross-sectional configuration fitted around the coaxial center conductor and an RF circuit separated from the airline circuit by a separation distance. The RF interconnect includes a compressible conductor structure having an uncompressed length exceeding the separation distance, and a dielectric sleeve structure surrounding at least a portion of the uncompressed length of the compressible conductor structure. The RF interconnect structure is disposed between the rectangular coaxial transmission line and the RF circuit such that the compressible conductor is placed under compression between the substrate and the RF circuit. Examples of the RF circuit include a vertical coaxial transmission line or a grounded coplanar waveguide circuit disposed in parallel with the center conductor of the rectangular coaxial transmission line.

US Patent:

6366185, Apr 2, 2002

Filed:

Jan 12, 2000

Appl. No.:

09/482188

Inventors:

Timothy D. Keesey - Huntington Beach CA
Clifton Quan - Arcadia CA
Douglas A. Hubbard - West Hills CA
David E. Roberts - San Pedro CA
Chris E. Schutzenberger - Long Beach CA
Raymond C. Tugwell - Simi Valley CA
Gerald A. Cox - Playa Del Rey CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 308

US Classification:

333260, 333246

Abstract:

An RF interconnect between an airline circuit including a dielectric substrate having a conductor trace formed on a first substrate surface and an RF circuit separated from the airline circuit by a separation distance. The RF interconnect includes a compressible conductor structure having an uncompressed length exceeding the separation distance, and a dielectric sleeve structure surrounding at least a portion of the uncompressed length of the compressible conductor structure. The RF interconnect structure is disposed between the substrate and the RF circuit such that the compressible conductor is placed under compression between the substrate and the RF circuit. Examples of the RF circuit include a vertical coaxial transmission line or a grounded coplanar waveguide circuit disposed in parallel with the airline circuit.

US Patent:

6417747, Jul 9, 2002

Filed:

Aug 23, 2001

Appl. No.:

09/935496

Inventors:

Timothy E. Dearden - Torrance CA
Jeffrey J. Stitt - Placentia CA
Clifton Quan - Arcadia CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 100

US Classification:

333247, 333260, 333 33

Abstract:

An RF interconnect is incorporated in RF module packages for direct attachment onto a multi-layer PWB using compressible center conductor (fuzz button) interconnects. The module has circuitry operating at microwave frequencies. The module package includes a metal housing including a metal bottom wall structure. The module includes a plurality of RF interconnects, which provide RF interconnection between the package and the PWB. Each interconnect includes a feedthrough center pin protruding through an opening formed in the metal bottom wall, with isolation provided by a dielectric feedthrough insulator. The center pin is surrounded with a ring of shield pins attached to the external surface of the bottom wall of the module housing. The pins are insertable in holes formed in the PWB, and make contact with fuzz button interconnects disposed in the holes. Circuitry connects the fuzz button interconnects to appropriate levels of the PWB for grounding and RF signal conduction.

US Patent:

6421021, Jul 16, 2002

Filed:

Apr 17, 2001

Appl. No.:

09/836896

Inventors:

Frederick C. Rupp - Redondo Beach CA
Clifton Quan - Arcadia CA
Patrick J. Fitzgerald - Northridge CA
Steven G. Buczek - Brea CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 1906

US Classification:

343753, 343770, 343772

Abstract:

A space-fed active array lens antenna system has an active array lens with a first array of radiating elements defining a front antenna aperture which transmits and receives RF energy from free space, a second array of radiating elements defining a rear antenna aperture which transmits and receives RF energy from a feed aperture, and an array of transmit/receive (T/R) modules sandwiched between the front aperture and rear aperture. The T/R modules include a phase control circuit and an amplitude control circuit which provide phase and amplitude control for RF signals passing through the modules. The feed aperture includes a wide band CTS aperture which produces a plane wave in the near field.

US Patent:

6674340, Jan 6, 2004

Filed:

Apr 11, 2002

Appl. No.:

10/121096

Inventors:

Clifton Quan - Arcadia CA
Brian M. Pierce - Moreno Valley CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 118

US Classification:

333164, 333 26, 343795

Abstract:

A switched loop RF radiator circuit, comprising a radiator element, a RF input/output (I/O) port, and a balun coupled between the radiator element and the (I/O) port. The balun includes a 180Â switched loop circuit having transmission line legs coupled to a balun transition to provide a selectable phase shift, and a microelectromechanically machined (MEM) switch Many radiator circuits can be deployed in an electronically scanned antenna array.

US Patent:

6677899, Jan 13, 2004

Filed:

Feb 25, 2003

Appl. No.:

10/373941

Inventors:

Jar J. Lee - Irvine CA
Clifton Quan - Arcadia CA
Brian M. Pierce - Moreno Valley CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 300

US Classification:

342376, 342372, 343753, 343754

Abstract:

A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a MEMS E-plane steerable lens array and a MEMS H-plane steerable linear array. The MEMS E-plane steerable lens array includes first and second arrays of wide band radiating elements, and an array of MEMS E-plane phase shifter modules disposed between the first and second arrays of radiating elements. The MEMS H-plane steerable linear array includes a continuous transverse stub (CTS) feed array and an array of MEMS H-plane phase shifter modules at an input of the CTS feed array. The MEMS H-plane steerable linear array is disposed adjacent the first array of radiating elements of the MEMS E-plane steerable lens array for providing a planar wave front in the near field. The H-plane phase shifter modules shift RF signals input into the CTS feed array based on the phase settings of the H-plane phase shifter modules, and the E-plane phase shifter modules steer a beam radiated from the CTS feed array in an E-plane based on the phase settings of the E-plane phase shifter modules.

US Patent:

6741207, May 25, 2004

Filed:

Jun 30, 2000

Appl. No.:

09/607604

Inventors:

Robert C. Allison - Rancho Palos Verdes CA
Clifton Quan - Arcadia CA
Brian M. Pierce - Moreno Valley CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 338

US Classification:

342371, 342375, 333164

Abstract:

An RF phase shifter circuit includes first and second RF ports, and a switch circuit comprising a plurality of micro-electro-mechanical (âMEMâ) switches responsive to control signals. The switch circuit is arranged to select one of a plurality of discrete phase shift values introduced by the phase shifter circuit to RF signals passed between the first and second RF ports. The circuits can be connected to provide a single-pole-multiple-throw (SPMT) or multiple-pole-multiple-throw (MPMT) switch function. The phase shifter circuits can be used in an electronically scanned array including a linear array of radiating elements, with an array of phase shifters coupled to the radiating elements. An RF manifold including a plurality of phase shifter ports is respectively coupled to a corresponding phase shifter RF port and an RF port. A beam steering controller provides phase shift control signals to the phase shifters to control the phase shift setting of the array of the phase shifters.

US Patent:

6822615, Nov 23, 2004

Filed:

Feb 25, 2003

Appl. No.:

10/373936

Inventors:

Clifton Quan - Arcadia CA
Jar J. Lee - Irvine CA
Brian M. Pierce - Moreno Valley CA
Robert C. Allison - Rancho Palos Verdes CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 300

US Classification:

343754, 342376

Abstract:

A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a wide band feedthrough lens and a continuous transverse stub (CTS) feed array. The wide band feedthrough lens includes first and second arrays of wide band radiating elements and an array of MEMS phase shifter modules disposed between the first and second arrays of radiating elements. The continuous transverse stub (CTS) feed array is disposed adjacent the first array of radiating elements for providing a planar wave front in the near field. The MEMS phase shifter modules steer a beam radiated from the CTS feed array in two dimensions.