Abstract

A novel dual-band dual-circularly polarized metasurface antenna (MSA) based on traveling-wave sequential feeding mechanism is proposed. It consists dual-resonance metasurface structures and it is excited by a two-port traveling-wave feeding network, which includes a cross slot etched on the ground and a circular feeding line. The results show that the proposed MSA works at two frequency bands, respectively which are from 18.8 to 20.4 GHz (8.16%) and from 28.1 to 29.1 GHz (3.5%). During both the two bands, right-handed and left-handed circular polarizations (CP) can be simultaneously achieved and polarization isolation is greater than 10 dB. Moreover, the 3-dB AR beamwidth is more than 174° at 19.6GHz in the lower band, and 124° at 29.7GHz in the upper band. Compared with the traditional designs, the proposed MSA has no complex feeding network, and has the advantages of miniaturization and simple design, which provides a new idea to achieve dual-band shared-aperture CP antenna arrays.

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