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. 2022 Jan 20;22(3):780. doi: 10.3390/s22030780

Figure 2.

Figure 2

(a) Disk Directivity in k−space (|2D−FT|) (5.0 [mm] radius). (b) Imposed Directivity equal to that of a disk in [0°,90°] and 0 elsewhere. (c,d) Real part and imaginary part of 2D−IFT: the ideal shape functions continuously modulated.