Comments on “Optimization of Sparse Frequency Diverse Array With Time-Invariant Spatial-Focusing Beampattern”

Presents comments on the paper, “Optimization of Sparse Frequency Diverse Array With Time-Invariant Spatial-Focusing Beampattern,” (Yange, Y.-Q., et al), IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 2, pp. 351–354, Feb. 2018.