Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Patent
1989-02-22
1990-08-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
342372, H01Q 2122
Patent
active
049490907
ABSTRACT:
A phased-array antenna is provided with a dummy antenna element and a dummy transmit/receive module for testing the other transmit/receive modules by transmitting test signals to, or receiving test signals from, the other antenna elements in the array. Test signals are transmitted in a test mode that alternates with normal-mode operation. Receive power level and/or phase can be checked. The transmit/receive modules in the array are simplified in structure and improved in reliability due to the elimination of special receive check circuits. Antenna accuracy can also be improved by adjusting the phase shifters in the transmit/receive modules to compensate for variations in transmission phase.
REFERENCES:
patent: 4176354 (1979-11-01), Hsiao et al.
patent: 4532518 (1985-07-01), Gaglione et al.
patent: 4639732 (1987-01-01), Acoraci et al.
patent: 4791421 (1988-12-01), Morse et al.
Hasegawa Hiroshi
Mutoh Norio
Okamura Hiroshi
Tamii Seizo
Tanii Noriyuki
Hellner Mark
Mitsubishi Denki & Kabushiki Kaisha
Tarcza Thomas H.
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