David D. Crouch - Corona CA Vincent Giancola - Chino CA Kenneth W. Brown - Yucaipa CA
Assignee:
Raytheon Company - Lexington MA
International Classification:
H01P 512
US Classification:
333125, 333137
Abstract:
A compact four-way waveguide power divider ( ). The inventive power divider ( ) includes an input waveguide ( ) that terminates at a junction with two adjacent waveguides on opposite sides of the input waveguide. On the opposite side of the junction is a conducting wall into which is built an inductive septum ( ). The inductive septum ( ) serves to partially match the input impedance of the structure. Second and third inductive septums ( and ) are also built into the output arms of the power divider ( ). The purpose of the second and third septums ( and ) is twofold. In addition to partially matching the power dividers input impedance, the positions of the second and third septums ( and ) can be adjusted to equalize the power division between the output arms. Hence, the waves exiting the four output arms of the power divider have highly equalized amplitudes and phases. Further, the phases at the output ports are equalized by adjusting the lengths of the output arms.
David D. Crouch - Corona CA Kenneth W. Brown - Yucaipa CA William E. Dolash - Monclair CA
Assignee:
Raytheon Company - Lexington MA
International Classification:
H01P 108
US Classification:
333252, 333251
Abstract:
A millimeter-wave window is constructed from a high conductivity metal plate. The metallic plate is made transparent over a range of frequencies by perforating it with a periodic array of slots. In one embodiment, the millimeter-wave window is used in a gyrotron as the output window. In such a case, one suitable periodic array of slots comprises an equilateral triangular array of slots for operation at 95 GHz. By proper choice of the hole spacing and diameter, the window can be made transparent at any desired frequency. In addition to being transparent, however, the window must also be vacuum tight, as the pressure inside a gyrotron is on the order of 10 torr. The present invention solves this problem by covering the surface of the window with a thin layer of a suitable dielectric material, such as fused quartz.
David D. Crouch - Corona CA William E. Dolash - Montclair CA
Assignee:
Raytheon Company - Lexington MA
International Classification:
G02B 2710
US Classification:
359618, 359629, 359636, 359196
Abstract:
A variable beamsplitter ( ) for use with quasi-optical millimeter-wave beams. The beamsplitter ( ) consists of a circular metal plate ( ) into which a periodic array ( ) of rectangular slots is cut. The plate ( ) is arranged so that the incident millimeter-wave beam is incident at an angle of 45Â relative to the surface of the plate ( ). The polarization of the incident beam is parallel to the surface of the plate ( ). When the orientation of the plate ( ) is such that the electric field is perpendicular to the slots (i. e. , the electric field is directed across the narrow dimension of the slots), the plate ( ) transmits nearly 100% of the incident power. If the plate is rotated about its axis by 90Â (while maintaining a 45Â angle between the incident beam and the plate) so that the incident electric field is parallel to the slots, then the plate ( ) transmits 0% and reflects nearly 100% of the incident power at an angle of 90Â relative to the incident beam. By varying the angle of rotation between 0Â and 90Â, both the reflected and transmitted power can be varied continuously between 0% and 100% of the incident power.
Variable Quasioptical Wave Plate System And Methods Of Making And Using
David D. Crouch - Corona CA Alan A. Rattray - Alta Loma CA
Assignee:
Raytheon Company - Waltham MA
International Classification:
H01Q 1524
US Classification:
343909
Abstract:
A wave plate ( ) formed of a perforated metallic plate of a particular thickness (L) has circular holes ( ) that induce a change in the polarization of an electromagnetic wave passing through the holes in the plate. By choosing the proper hole diameter, the hole spacing in orthogonal directions, and the plate thickness, the desired relative phase shift is achieved with maximum transmission and minimal reflection. Two or more axially-aligned wave plates form a variable wave plate system. By changing the relative rotational positions of the wave plates, the polarization of the electromagnetic wave passing through the system can be selectively varied.
Reflecting Surfaces Having Geometries Independent Of Geometries Of Wavefronts Reflected Therefrom
David D. Crouch - Corona CA William E. Dolash - Montclair CA
Assignee:
Raytheon Company - Waltham MA
International Classification:
H01Q 1908
US Classification:
343753, 343909
Abstract:
A flat metal plate ( ) has a plurality of holes ( ) that have a property that changes across the surface of the plate so that the flat plate ( ) mimics the behavior of a curved wavefront transformer. The changing property can include a dimension, such as radius or depth, such that the holes ( ) near the center of the plate ( ) are smaller, for example, than the holes ( ) further away from the center of the plate ( ). The size of each hole ( ) is a function of the local phase change imparted on an electromagnetic wave of a particular wavelength or frequency that hits the hole ( ), plus the propagation phase change that occurs in the reflected wave exiting the hole ( ) as it travels the distance between the hole ( ) and the focal point.
David D. Crouch - Corona CA, US William E. Dolash - Montclair CA, US
Assignee:
Raytheon Company - Waltham MA
International Classification:
H01Q015/14
US Classification:
343912, 343909
Abstract:
An optically transparent dielectric reflector () that reflects an incident millimeter-wave beam at a design frequency. The reflector () includes layers of different optically transparent dielectric materials. The thickness of the individual layers is chosen so that the transmitted waves cancel almost completely in the forward direction, yielding a high degree of transmission loss and substantial reflection. In the preferred embodiment, the invention is comprised of alternating layers of optical sapphire and air. In the best mode, there are seven sapphire layers, with outer sapphire layers () having a nominal thickness of 70. 8 mils, inner sapphire layers () with a nominal thickness of 30. 4 mils, and air layers have a nominal thickness of 32. 0 mils Vented metal spacers () are used to maintain optimal thickness of air layers.
Sensor Suite And Communication System For Cargo Monitoring And Identification
David J. Canich - Upland CA, US David D. Crouch - Corona CA, US James R. Gallivan - Pomona CA, US Robert E. Karlson - Mission Viego CA, US Keith G. Kato - Alta Loma CA, US David R. Sar - Corona CA, US Philip D. Starbuck - Redlands CA, US
A system and method for monitoring a cargo container. The novel system () includes a sensor module () mounted in each target area () and a central monitoring system (). Each sensor module () includes one or more sensors () and a transceiver () for transmitting data from the sensors to the central monitoring system (). The central monitoring system () includes a transceiver () for receiving the data from all sensor modules () and a local master processor () for processing and analyzing the data. In the preferred embodiment, each transceiver () is capable of receiving and retransmitting signals of other sensor modules to relay signals of a particular sensor module () in a daisy chain fashion to and from the central monitoring system ().
David D. Crouch - Corona CA, US Michael Sotelo - Chino CA, US William E. Dolash - Montclair CA, US
Assignee:
Raytheon Co. - Waltham MA
International Classification:
H01Q 1/38 H01Q 13/10
US Classification:
343700MS, 343770
Abstract:
A system and method for combining and radiating electromagnetic energy. The invention includes a novel antenna comprising a first dielectric substrate having opposite first and second surfaces, a patch of conducting material disposed on the first surface, a ground plane of conducting material disposed on the second surface, and at least three input ports, each input coupled to the patch at a feed point. The feed points are positioned to minimize the total power reflected from each input port. In an illustrative embodiment, the feed points are equally distributed around a circle having the same center as the patch and having a radius chosen to minimize the reflections at each input. In accordance with the novel method of the present invention, the outputs of multiple sources are combined in the antenna itself, by coupling the sources directly to the antenna.
Name / Title
Company / Classification
Phones & Addresses
David Crouch
Liberty Tax Service Tax Return Preparation
207 King Street West, Kitchener, ON N2G 1A1 5197446371, 8008767101
Mr. David Crouch
Liberty Tax Service Tax Return Preparation
31 Main Street, Cambridge, ON N1R 1V6 5196248732
David Crouch President
Tap Ventures Inc Manufacturers Agents & Representatives
305 1140 Homer St, Vancouver, BC V6B 2X6 6046834563, 6046836880
David Crouch President
Tap Ventures Inc Manufacturers Agents & Representatives
6046834563, 6046836880
David Crouch Director
STANFORD BUILDING, INC
1917 Stanford St, Greenville, TX 75401
David Crouch Director, Director , Vice President
MILITARY OUTDOOR CLOTHING, INC Whol Nondurable Goods Ret Misc General Merchandise · Family Clothing Stores
Dr. Crouch graduated from the Loyola University Chicago Stritch School of Medicine in 1991. He works in Knoxville, TN and specializes in Family Medicine.
Sep 1997 to 2000 Aircraft InspectorDynabil Industries Inc Coxsackie, NY Nov 1996 to Sep 1997 Manufacturing EngineerLockheed Martin Logistics Management Arlington, TX Nov 1995 to Nov 1996 Airplane general mechanic
Education:
American Graduate University Covina Covina, CA 2014 Master's in Contract ManagementCommunity College of the Air Force Maxwell Air Force Base Maxwell AFB, AL Jun 1995 Associate's in Aircraft Maintenance TechnologyState University College at Buffalo Buffalo Buffalo, NY May 1995 Bachelor's in Industrial Technology
Isbn (Books And Publications)
The Beaumont Twins: The Roots and Branches of Power in the Twelfth Century
the crisis. They ranged from my constituents want blood, from the late Peter Mills, MP for Devon West, to please no blood, from another MP, David Crouch whereas the late Robert Rhodes James, a historian turned Tory MP, was apparently hopelessly defeatist, depressed and disloyal.
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