Design of Hybrid Element Transmitarray Antenna with Beamforming at Millimeter-wave Frequency

Increasing users of cellular technology will affect the speed of communication access which has entered the 5G era. One of the antennas that support this technology is the transmitarray antenna that can achieve high gain. At the mmWave frequency, beamforming facilities are supported to form the beam direction with a large gain array. To perform the beamforming technique, a large phase range is required. One of the techniques used is the hybrid technique, which combines different unit cell configurations. Based on this technique, a transmitarray antenna with vertical beamforming was designed at a frequency of 20 GHz. The implemented element unit cells are malta cross, rectangular and square ring slots with a width of 0.6 mm and 1 mm. The beamforming was obtained by simulation with a separation angle of ± 20° vertically and gain 13.46 dBi. The antenna was fabricated and measured with 7 x 7 hybrid unit cell elements.