Hybrid directional coupler for a radar system

Details Hybrid directional coupler for a radar system Hybrid directional coupler for a radar system

H - Electricity

01

P

333/10, 333/14

H01P 5/18 (2006.01) G01S 7/03 (2006.01)

Patent

CA 2020573

ABSTRACT OF THE DISCLOSURE 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 dish type antenna and a phased array antenna.

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