Shaped patterns synthesis in time-modulated antenna arrays with static uniform amplitude and phase excitations

Abstract

A novel approach for the synthesis of shaped beam patterns in time-modulated antenna arrays (TMAAs) with static uniform amplitude and phase excitations is proposed in this paper. Based on the sideband radiation in TMAAs, shaped beam patterns can be realized by only controlling the switch-on time sequences of the TMAAs. Differential evolution (DE) algorithm is adopted to optimize the time modulation parameters to obtain the desired flat-top and cosecant-squared beams and to suppress the sidelobe levels (SLLs). Simulation results of a time-modulated linear array (TMLA) and a time-modulated semicircular array (TMSA) demonstrate the effectiveness of the proposed approach for the synthesis of shaped beam patterns from TMAAs.

Keywords

antenna arrays / time modulation / shaped pattern / differential evolution