Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Patent
1992-11-06
1994-03-15
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
434 2, 342169, G01S 740
Patent
active
052949346
ABSTRACT:
A phase measurement circuit of a phased array antenna having both transmitting and receiving functions includes a plurality of antenna elements arranged in a line or on a plain; phase shifters disposed corresponding to the antenna elements, respectively, for shifting phases of signals to form a beam in a desired direction by changing the phase value; a control circuit for controlling the phase shift quantity of the phase shifter; a test antenna for receiving electric wave of a transmission frequency band from the phased array antenna and transmitting a test signal for measuring an excitation phase to each element of the phased array antenna; and a test translator for converting a frequency of the signal of the transmission frequency band received by the test antenna to that of the signal of a reception frequency band and outputting it as a test signal to the test antenna. Thus, a loop of the signal is formed between the terminal for the transmitted signal and the terminal for the received signal in the phased array antenna, whereby the phases of transmitting and receiving systems can be respectively measured.
REFERENCES:
patent: 4560987 (1985-12-01), Dochow et al.
patent: 4949090 (1990-08-01), Tamii et al.
patent: 5086302 (1992-02-01), Miller
"Phased Array Technology Workshop" Microwave Journal, Sep. 9-10, 1981 pp. 16-22.
Seiji Mano et al., "A Method for Measuring Amplitude and Phase of Each Radiating Element of a Phased Array Antenna", Institute of Electronics and Comm. Engineers of Japan, vol. J65-B, pp. 555-560.
Blum Theodore M.
Mitsubishi Denki & Kabushiki Kaisha
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