Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1989-12-15
1992-01-28
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342202, H01Q 326
Patent
active
050847066
ABSTRACT:
A transmitter array includes a number of individual transmitters, each contributing a series of short microwave pulses each consisting of only several cycles to make up an RF pulse in the far field. Apparatus for closed loop synchronizing the pulses from each transmitter in order to maximize the amplitude of the RF pulse includes a Voltage Control Oscillator which provides a continuous wave (CW) reference to each transmitter and includes apparatus for dividing the CW down to feed a series of timers in each transmitter, each timer having a means for setting the time and duration of firing and providing an output signal synchronously related to the CW. A dual polarity peak detector fine tunes the individual transmitters via closed loop feedback to compensate for any thermal drift. A novel time delay vs. voltage transducer is used to achieve closed loop synchronization. Short term pulse jitter is significantly reduced by overtriggering the avalanche transistor. Beam steering is accomplished by simply adjusting a regulated DC voltage at each radiating source in the array. The end result is a low cost means for forming a time steered array of short pulse microwave sources.
REFERENCES:
patent: 3524186 (1970-08-01), Fleri et al.
patent: 3714655 (1973-01-01), Ross et al.
patent: 3940696 (1976-02-01), Nagy
patent: 4743906 (1988-05-01), Fullerton
Mara Richard M.
Ross Gerald F.
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