Abstract
Frequency diverse array (FDA), by virtue of its range-angle-dependent beam pattern, has drawn a substantial attention in recent years. However, as far as the time-variant range-angle-coupled beam pattern is concerned, such inherent flaw has become a bottleneck of its further development. To address this issue, herein, a logarithm-based optimised static non-linear frequency offset (LOSNFO) for FDA is proposed, which can successfully alleviate its inherent flaw, thus producing a short-time range-angle-decoupled beam pattern with low sidelobe levels (SLLs) and narrow half-power beam widths (HPBWs). Moreover, for practical applications, the proposed LOSNFO considers the propagation effect, which is always neglected in its counterpart. Numerical results are reported to demonstrate the effectiveness and superiority of the proposed LOSNFO-FDA.
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