A novel circularly polarized / dual band dual polarized antenna using metasurface

摘要

In this paper a novel circular polarized/dual band dual polarized antenna has been proposed, which is validated experimentally using the meta-surface. First a 45 rotated rectangular loop based meta-surface is excited with a patch radiator to obtain the dual band dual polarized operation. Thereafter another same meta-surface is loaded on top of it to merge the two dual polarized band to obtain circular polarization. Appropriate rotation of the top meta-surface ensures maximum coupling with the X directed electric field from the bottom MS. Impedance bandwidth for dual band dual polarized operation is from 5GHz-5.28 GHz and from 5.6 GHz-5.75 GHz. For circular polarization response, impedance band width is from 4.8 GHz-5.77 GHz (Fractional Bandwidth of 19%). and 3 dB axial ratio is from 5.15 GHz-5.76 GHz. Measured gain of the antenna is 7.4 dB.