High Efficiency Transmitarray Antenna with Optimum Feed

A high efficiency transmitarray antenna with the optimum feed is proposed in this article. First, the design criteria for the optimum feed pattern are given, for the purpose of illuminating the transmitarray aperture with uniform amplitude distribution and small spillover. Second, a simple array is skillfully designed to realize the desired optimum feed pattern. Finally, a transmitarray with aperture size of 8.4λ
0
× 8.4λ
0
is simulated, fed by the designed optimum feed. The simulated results indicate that the realized gain of 27.07 dBi and the high aperture efficiency of 57.5% are obtained.