Gratinglobe suppression of phased array antenna for mobile satellite communications

A gratinglobe suppression technique of phased array antenna using an angular spatial filter is described. Angular spatial filter can be added to the existing antenna in order to reduce gratinglobes of the antenna. Based on microwave theory and EM analysis, an angular spatial filter is designed. The designed angular spatial filter has the power level lower 17 dB around /spl plusmn/ 50/spl deg/ from the main beam, ripple /spl plusmn/ 1.5 dB, and pass angle 20/spl deg/ at 12.25 GHz on TE case and power level lower 15 dB, ripple /spl plusmn/ 1.4 dB, and pass angle 27/spl deg/ at 12.25 GHz on TM case in satellite communication In this paper the measured results are shown to be not bad in the gratinglobe suppression. The designed filter is applicable for the reduction of gratinglobes for the phased array antenna system and radome of beamforming antenna.