One‐dimensional high‐gain beam‐scanning transmitarray fed by phased array with continuous electronic scan and low scan loss

Abstract

In this study, the design of a one‐dimensional high‐gain beam‐scanning transmitarray fed by a phased array with continuous electronic scan and low scan loss is displayed and demonstrated. The feeding linear phased array realizes continuous beam scanning in one plane. And the transmitarray performs phase compensation along another plane to increase the gain. The traditional array‐fed scanning transmitarray has homogeneous phase compensation in one direction. Differently, the phase compensation in the proposed method is carefully designed considering that the beam is scanning. By designing the phase distribution of the transmitarray column by column, the scan loss is successfully reduced. The experimental results of a designed scanning transmitarray fed by a phased array without feeding network show the peak gain of 22.76 dBi and the scan loss of only 1.43 dB within the scanning range of ±35° at the centre frequency of 13.5 GHz. Hence, the advantages of continuous electronic scan, high gain, and low scan loss are validated. Moreover, by integrating the power divider and phase shifters into the feeding phased array, the measured gain increment of 8.26–9.89 dB and the scan loss of 1.74 dB within ±35° are obtained.