Patent ID: 7656347
Filing Date: 2010-02-02
Classification: G01S

Abstract:
1. A quadrature radar apparatus comprising: a quadrature signal generating unit generating four signals having 0 degree, −90 degrees, −180 degrees, and −270 degrees, respectively; first and second coupler modules each receiving one of the signals from the quadrature signal generating unit and outputting a transmission signal and a transmission leakage signal; an antenna unit receiving the transmission signals from the first and second coupler modules and a reception signal reflected from a target; a first phase delay module connected between the first coupler module and the antenna unit to delay the phases of the transmission and reception signals by 90 degrees; a leakage signal canceling unit combining the reception signals inputted from the antenna unit through the first and second coupler modules and removing the transmission leakage signal; a power distribution unit distributing an output signal of the leakage signal canceling unit; and first and second mixing units mixing the signal of the quadrature signal generating unit and the output signal of the power distribution unit.