Circular Slot Antenna Systems for OAM Waves Generation

In this letter, two simple and novel circular slot antenna systems to generate OAM waves are proposed. Special feeding networks, which can be used to generate two OAM modes, are designed at 2.4 GHz to feed the circular slot antenna. Furthermore, two antenna systems are fabricated and tested. Both the simulation and measurement results demonstrate the effectiveness of the antenna systems for generating OAM waves.