I. Introduction
The need for high data rates has grown exponentially in recent years, especially with the introduction of new services such as video-on-demand and the Internet of Things (IoT). One of the solutions supporting this new increased data rate is based on solutions such as antenna arrays that can improve the signal-to-noise ratio (SNR) and thus increase the spectral efficiency. On the other hand, they may require high cost and cause high power consumption on the transmitter side [1].