Ring Slot-based Antenna Design for mmWave Intergrted OAM Wave Excitations

In this paper, a ring slot antenna modified by the substrate integrated resonator is proposed for OAM wave excitation at mmWave band. The strip line is employed as a power divider to generate four feeding points with π / 2 phase delays. Changing the ring design parameters can help to adjust the surface current distribution, and further excite the OAM waves with different modes. This antenna topology has the advantages of a low profile, easy for integration and tuning of radiation modes, as well as a maximal radiation gain of 8.5 dBi at 26.0 GHz.