BRIAN GREGORY KEATING
Pilots at Ln Jolla Farms Rd, La Jolla, CA
License number
California A3864767
Issued Date
Aug 2015
Expiration Date
Aug 2016
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
9633 La Jolla Farms Rd, La Jolla, CA 92037
Professional information
Wide Band Microwave Phase Shifter
US Patent:
2010010, Apr 29, 2010
Filed:
Oct 28, 2008
Appl. No.:
12/259672
Inventors:
Brian G. Keating - La Jolla CA, US
International Classification:
G02B 6/00, G02B 27/00
US Classification:
385 11, 359577
Abstract:
The invention relates to a phase shifting device for switching the polarization state of an electromagnetic wave. Two waveguide sections have an exterior rectangular opening defined in their end surfaces. A dielectric break is situated substantially collinearly with the longitudinal axis of the waveguide in substantially a center of the waveguide. In one embodiment, a central structure includes a cylinder having a permeability greater than that of a vacuum, and having two substantially circular end faces situated in perpendicular orientation to a longitudinal axis of the cylinder and two dielectric cones. A magnetic field source switches a polarization of the electromagnetic wave causing a phase shift of the electromagnetic wave of substantially zero degrees when the controllable magnetic field is off and a pre-determined phase shift when the controllable magnetic field is on. The invention can be used in an interferometer apparatus and a phased array apparatus.
Wide-Bandwidth Polarization Modulator For Microwave And Mm-Wavelengths
US Patent:
7501909, Mar 10, 2009
Filed:
Jun 9, 2006
Appl. No.:
11/450753
Inventors:
Brian Gregory Keating - La Jolla CA, US
Andrew E. Lange - La Canada CA, US
Andrew E. Lange - La Canada CA, US
Assignee:
California Institute of Technology - Pasadena CA
International Classification:
H01P 1/165
US Classification:
333 21A, 333 243
Abstract:
A polarization modulator device for modulating a polarization of an electromagnetic wave includes a corrugated metallic waveguide having an interior cylindrical opening defined therein and situated along a longitudinal axis of the waveguide. The corrugated metallic waveguide also has a first waveguide section and a second waveguide section. The waveguide sections are separated by a dielectric break. A central structure is situated along the longitudinal axis of the waveguide. The central structure is supported substantially in the center of the interior cylindrical opening of the waveguide. The cylinder is substantially situated within the dielectric break of the waveguide. A magnetic field source is configured to permit a controllable magnetic field in the cylinder, wherein the magnetic field modulates a polarization of the electromagnetic wave by an angle related to the strength of the magnetic field. A polarimeter using the polarization modulator is also described.