Granted Patent
Utility
US 5,253,188 · App. 07/688,651
Built-in system for antenna calibration, performance monitoring and fault isolation of phased array antenna using signal injections and RF switches
Inventors:
Kuan M. Lee, Ruey S. Chu, Sien-Chang C. Liu
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Apr 19, 1991
Inventors
Kuan M. Lee
Ruey S. Chu
Sien-Chang C. Liu
Assignee (at issue)
Hughes Aircraft Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.