Designing a Broadband Circularly Polarized Patch Antenna Array for Millimeter-Wave Beamforming

A 2×2 corporate-fed microstrip patch antenna array with broadband and circularly polarized characteristics was developed to investigate the millimeter-wave beamforming technique. A beamforming network that provides equally divided power and true-time delay progressive phase shifts was deployed to provide the corresponding rotation phase to each array element. A high gain and circularly polarized r...