Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-11-25
1979-07-03
Moskowitz, Nelson
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 944
Patent
active
041602480
ABSTRACT:
A Doppler radar employing a common antenna for transmitting and receiving. A single sideband modulator (SSBM) is employed in the transmitting circuit to offset the rf reference frequency during transmit time and to discontinue offset during receiver ON time. Through a coupler and isolators an attenuated portion of the rf reference signal is applied to the receiver mixer at gated intervals. The output of the mixer are signals which are free of undesired reflected transmitter signals.
REFERENCES:
patent: 3430236 (1967-09-01), Gamertsfelder
patent: 3460067 (1969-08-01), Burnsweig, Jr.
patent: 3710386 (1973-01-01), Darboven et al.
patent: 3866224 (1975-02-01), Porter et al.
patent: 3886550 (1975-05-01), Gilleran et al.
Hubka Theodore
Slater Robert W.
Goodwin Lawrence
Kennedy T. W.
Moskowitz Nelson
The Singer Company
Wright Laurence A.
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