Sidelobe reduction of monopulse patterns using time modulated array antenna

A low sidelobe level pattern in the phased array antenna is desired for radar systems. The phase shifter control type time modulated array antenna has been investigated to achieve ultra-low side lobe pattern. In this method, a desired pattern can be accomplished in a time average procedure by temporally controlling of each element phase. For angle tracking radar, application of time-modulated array antenna for mono-pulse antenna (sum pattern and difference pattern are formed) has been studied. In this paper, a sidelobe reduction method of mono-pulse pattern based on the time-modulated array and phase offset procedure is proposed. The proposed method does not require additional hardware for the conventional mono-pulse antennas. The effectiveness of the proposed technique is demonstrated by computer simulation.