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Time-modulated arrays (TMAs) are antenna systems in which the beam-forming is achieved by properly synthesizing the periodic pulse sequence controlling the radio-frequency (RF) switches at the output of each array element. Because of the periodic pulse behavior, harmonic signals are generated at multiples of the modulation frequency which can be suitably exploited for different applications, like...
In this paper, an innovative two-step PSO-based approach has been presented for the synthesis of sub-arrayed time-modulated arrays. First, the BEM have been used to determine the "best" sub-array configuration, while the PSO has been successively exploited to optimize the pulse sequence in order to minimize the power losses in SR.
In this paper, the potentialities of time-modulation are further investigated in the framework of compromise array synthesis as an alternative solution to standard compromise methods. More in detail, starting from a set of static excitations aimed at synthesizing a user-defined sum pattern at the carrier frequency, a compromise difference beam is generated through a suitable sub-arraying pattern matching...
In this paper, an innovative approach for the reduction of the sideband level in time-modulated linear array has been presented. First, the proposed strategy has been mathematically justified showing that the SBL can be lowered by modifying the switch-on instants. Accordingly, a PSO has been used to minimize a suitable cost function quantifying the mismatch between the actual pattern features and...
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