Generation of dual-mode PS-OAM beams using a Vivaldi antenna array

The paper proposes a single antenna that can generate dual-mode plane spiral orbital angular momentum (PS-OAM) beams. Six Vivaldi antennas placed in a tangential circular array make up the antenna, and the antenna is etched onto a substrate material and has a flat design, allowing for easy integration with other system components. The neighbouring ports of the antenna elements have phase differences, so phase-shifting in the feeding network is unnecessary. When fed with the same phase and amplitude, the antenna can produce PS-OAM beams with mode +1 at 7 GHz and mode +2 at 14 GHz, and the measured purity is 80.6% and 63%, respectively. The method may provide a new way to produce multi-mode orbital angular momentum. The paper proposes a single antenna that can generate dual-mode plane spiral orbital angular momentum (PS-OAM) beams. Six Vivaldi antennas placed in a tangential circular array make up the antenna. The method of design may provide a new way to produce multi-mode orbital angular momentum and has potential applications in the OAM-multiple-input multiple-output communication system. image