A Novel Direction of Arrival Estimation Planar Monopulse Receiver

In this paper, a monopulse receiver is proposed to estimate the arrival of angle. The entire system is composed of a 4 - element planar monopulse array and a down conversion link. The array is composed of planar comparator network including novel coupler and zero-phase delay crossover. The down conversion link is composed of filter, low noise amplifier, mixer, and PLL. To verify the design concept, a prototype planar monopulse array operating at 5.7 GHz is designed and fabricated, and Keysight microwave kits is configured as down conversion to receive the signals from array. The system level measurement results are aligned well with simulation and theory, and the angular information of remote target is estimated from the two-channel signal.