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The synthesis of time-modulated linear arrays (TMLAs) is addressed in this work by considering the optimization of the switch-on instants of the radio-frequency (RF) switches used to modulate the static element excitations. It is shown that these additional degrees of freedom can be exploited to maintain some features of the radiation pattern more constant throughout the modulation period. Representative...
An approach for the suppression of undesired signals impinging on a planar array is presented in this paper. The procedure is based on a dynamic thinning enforced to the array to move sidelobe nulls. Towards this aim, each element of the array is equipped with a radio-frequency switch which is used to connect/disconnect the element to the feeding network. While changing the thinning sequences, the...
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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