Complex magnitude of the transmitted field. (a) The simulated focal length is taken to be the center of the beam spot which is 20.6 μm away from the transmitarray and the designed focal length is 21 μm, (b) the complex magnitude of the transmitted E-field across the focal plane. The incident field magnitude is  V/m and the peak magnitude of the focused field is 3.89 V/m. The transmitarray has a focusing power of 2.75 times.