Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-02-25
1981-12-15
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DD, 343 171PW, G01S 728
Patent
active
043062377
ABSTRACT:
A timing circuit (20, 22, 24) for use with a pulsed solid state radar generates signals which are applied to a pulse forming circuit (33) to provide preheat and immediately subsequent thereto current drive pulses applied to IMPATT diodes which in response thereto generate RF signal pulses (10, 12) having reduced chirp and level variations. The pulses are formed by transistors (70, 74) which are rendered conductive when their current return paths (28, 38) are established through resistors (34, 44) whose values determine the levels of the preheat and drive pulses.
The duration of the preheat pulse is made responsive to ambient temperatures by using a negative-temperature-coefficient thermistor (86) as the time determining element of the timing circuit. The level of the preheat pulse is made responsive to ambient temperature by using positive-temperature-coefficient silicon thermistors (34) in the above mentioned current return path.
REFERENCES:
patent: 3458817 (1969-07-01), Cooper et al.
patent: 4058810 (1977-11-01), Bryden
patent: 4171514 (1979-10-01), Faxon
Christoforo W. G.
Lamb Bruce L.
The Bendix Corporation
Tubbesing T. H.
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