60-GHz Phased Transmitarray with High Gain and Low Profile

Due to the restricted transmit power and high propagation loss, highly directional antennas are urgently required in 60-GHz frequency band. In this paper, a low-loss transmitarray antenna (TAA) fed by a 6×6 phased array antenna (PAA) for high-gain conical beam scanning is proposed at 60 GHz. The TAA element is with the arrow-shaped metallic pattern in the middle layer and two polarizers in the upper and bottom layers. The PAA feed element is the printed patch antenna with equivalent metallic cavity, showing an advantage of ease of integration with the control circuits. Simulated results show that the proposed PAA-fed TAA features a peak simulated gain of 29.89 dBi in the broadside direction, corresponding to the aperture efficiency of 53.9%, together with a narrow conical beam scanning with a ~2 dB beam crossover.