A beam steering device comprising a set of phase shifters, each providing substantially same phase shift, connected such that output of one phase shifter feeds the input of other, in that a signal is cascaded through the set of phase shifters to generate a corresponding set of phase shifted signals, and an array of antennas forming the RF radiation beam. The set of phase shifted signals are coupled to the respective one of antenna in the array of antennas so as to steer the RF radiation beam in accordance with the phase shift. The device further comprises a set of mixer to translate the first set of phase shifted signals to a RF canter frequency.