105071.fig.007a
(a) Infinite 2D cylinder
105071.fig.007b
(b) Complex EW approx
105071.fig.007c
(c) Fresnel approx
Figure 7: Computed near-field distribution around an infinite 2D cylinder at 500 MHz. (a) Exact numerical integration. (b) Complex echo width (EW) approximation. (c) Fresnel approximation.