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In the recent years constructing time-invariant spatial-focusing beampatternsby using frequency diverse arrays (FDAs) is conveyed in several papers. Furtherthan time-invariant spatial-focusing beampatterns, the unfeasibility ofconstructing range-dependent time-invariant beampatterns is demonstrated inthis paper. It is indicated that the beampatterns produced by antenna arraysincluding FDAs are not independently controllable in time, t, and range, r,dimensions, in the farfield. Inappropriate applications of the FDAs havingtime-invariant spatial-focusing beampatterns in two recent papers are alsodiscussed.

On the Time-Range Dependency of the Beampatterns Produced by Arbitrary  Antenna Arrays: Discussions on the Misplaced Expectations from Frequency  Diverse Arrays