Directivity Measurement of a Weight-Polarized Beam-Steering MIMO Antenna with a Circular Phased Array

To ensure the success of upcoming car-to-car networks, the in-vehicle antenna system must adapt to the variation of the radio-wave propagation environment depending on the dynamic motion of a car. In this study, we present a 4×4 multiple-input multiple-output antenna that utilizes not only the circular phased array technology but also the weight-polarization control function. The experimental results reveal that the directivity of the proposed antenna adjusts to the characteristics of the incident wave by the optimized weight function.