%K array time modulation control , closed-form expression , particle swarm optimiser , power losses minimisation , pulse sequences , sideband radiation optimisation , time-modulated planar array %X In this study, the minimisation of the power losses because of undesired sideband radiations in time-modulated planar arrays is dealt with. A closed-form expression for evaluating the total power wasted in the sideband radiations is obtained and exploited to design a new procedure based on a particle swarm optimiser for the synthesis of the pulse sequences devoted to control the array time modulation. A set of representative results is reported and analysed to assess the effectiveness of the proposed approach. "This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves, Antennas & Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library". %D 2011 %A Lorenzo Poli %A Paolo Rocca %A Luca Manica %A Andrea Massa %I University of Trento %T Time modulated planar arrays: Analysis and optimization of the sideband radiations %L elediasc12460