A high-gain shared-aperture dual-band OAM antenna with parabolic reflector

This paper presents a novel shared-aperture antenna array for producing orbital angular momentum (OAM) wave in both C- and X-bands with the center frequency of 5.8 and 10 GHz, respectively. To enhance the antenna directivity, a parabolic reflector is specially designed. The microstrip patch with parasitic element is employed to obtain broad bandwidth. The proposed antenna array consists of eight elements at each operating band. The C- and X-bands OAM arrays are combined in the same aperture to coincide the center of the dual-band arrays, which can be used as the feed of the parabolic reflector. The simulated results show that the proposed antenna can generate OAM beams with the maximum directivity of 20.1 dBi and 25.8 dBi at 5.8 and 10 GHz, respectively.