Circularly Polarized Series Fed Antenna Array for Automotive 5G mmWave Communcations

This paper presents a circularly polarized series-fed microstrip patch antenna array for 5G mmWave communications to be used in the automotive industry. The proposed design operates in the 28GHz band (27.5GHz-28.35GHz) and can be implemented as a
$2\mathrm{x}2$
Multiple-Input Multiple-Output (MIMO) antenna system in the front and back windshield to obtain larger coverage area around the vehicle and increase total throughput of the system or can be placed within a housing on the top roof. The array is designed using tapered line method where each element of the array is fed through different transmission lines with different impedance characteristics. The design is simulated using FEKO software and the results are presented and plotted in terms of reflection coefficient and total circular radiation pattern.