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Application of range-angle focusing frequency diverse array (FDA) for securewireless communication has been proposed in recent years. However, it can beproven that the FDAs are not suitable for secure wireless communication and thesame properties of the focusing FDA can be obtained by using traditional phasedarrays, more effectively. Besides, in this paper, it is indicated that FDAs arenot good candidates for constructing time-variant focusing beampatterns, whileconstructing time-invariant focusing beampatterns is impossible at all.Furthermore, some incorrect considerations about the FDAs are highlighted.

Frequency Diverse Arrays (FDAs) vs. Phased Arrays: On the Application of FDAs for Secure Wireless Communications