Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1989-07-06
1991-03-05
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342175, 455 86, G01S 1393, G01S 703
Patent
active
049981102
ABSTRACT:
The invention is directed to a directional coupler for coupling together a radar frequency transmitter to a combined transmitting and receiving antenna, a power absorber and a receiver. A tunable stub is employed to reflect a selected amount of transmitted energy to the local oscillator (LO) of the receiver for mixing with the incoming received signal. The coupler can be constructed from any known type RF transmission line suitable for passing or coupling signals of radar frequencies. A significant amount of the transmitter power is absorbed in a power absorbing RF load allowing only a small amount to be transmitted from the antenna and a still smaller amount fed back as LO to the receiver. The invention works equally as well on a disk type antenna and a phased array antenna.
REFERENCES:
patent: 3297967 (1967-01-01), Hunton
patent: 4157549 (1979-06-01), Davis
Barron Jr. Gilberto
Gilliam Frank D.
Radar Control Systems Corporation
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