MICHAEL OVA HATFIELD
Pilots at Sussex St, Fredericksburg, VA
License number
Virginia A2265596
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
107 Sussex St, Fredericksburg, VA 22405
Professional information
Reverberation Chamber Tuner And Shaft With Electromagnetic Radiation Leakage Device
US Patent:
6686818, Feb 3, 2004
Filed:
Feb 19, 2002
Appl. No.:
09/936135
Inventors:
Joseph Weibler - West Chicago IL
Matthew Squire - Palatine IL
Stan Zielinski - Glendale Heights IL
Dale Svetanoff - Monticello IA
Michael Slocum - Colonial Beach VA
Michael O. Hatfield - Fredericksburg VA
Matthew Squire - Palatine IL
Stan Zielinski - Glendale Heights IL
Dale Svetanoff - Monticello IA
Michael Slocum - Colonial Beach VA
Michael O. Hatfield - Fredericksburg VA
Assignee:
The Curran Company - Glendale Heights IL
International Classification:
H01P 700
US Classification:
333231, 333232, 324637, 324638
Abstract:
A tuner ( ) for a reverberation chamber is provided comprising a plurality of electrically conductive surfaces ( ) attached to each other in a Z-fold configuration. Each lateral edge ( ) of the tuner is contacted with a generally planar, laterally positioned substrate ( ) which prevents lateral extension or medial compression of the Z-fold. Optionally, end substrates ( ) are attached to each of the two leading edges ( ). Also, a device minimizes electromagnetic radiation leakage along a shaft including: a bearing housing; a plurality of thrust bearings contacting the bearing housing and axially juxtaposed along the shaft so that at least two thrust bearings oppose each other; a radial bearing intermediate each thrust bearing; and a provision for adjustably moving the thrust bearings toward each other so as to compress the thrust bearings against the bearing housing.
Means And Method For Performing Shielding Effectiveness Measurements Using Mode-Stirred Chambers
US Patent:
H8214, Sep 4, 1990
Filed:
Mar 27, 1990
Appl. No.:
7/499747
Inventors:
Michael O. Hatfield - Fredericksburg VA
Lawrence C. Halley - Zacata VA
Lawrence C. Halley - Zacata VA
Assignee:
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
G01R 2700
US Classification:
324627
Abstract:
A method of determining radiated shielding effectiveness for a piece of epment under test (EUT) utilizing a mode-stirred chamber. Radio frequency (rf) fields are transmitted from a broad band noise source into the mode-stirred chamber. A first paddle wheel tuner uniformly distributes the rf fields throughout the chamber. The EUT is housed in the chamber such that it is exposed to the transmitted rf fields. A second paddle wheel tuner and receiving antenna are mounted within the EUT to isolate them from the transmitted rf fields. The second paddle wheel uniformly distributes any rf fields that leak into the EUT and the receiving antenna is used to detect the rf leakage.