Tensor Surface Impedance Characterization of Isotropic Inhomogeneous Metasurface Backed CSRR Loaded Sub-6 GHz Dual-Band MPA

In this letter, a rotated dual-split complementary circular split ring resonator (RDS-CCSRR) loaded isotropic, inhomogeneous metasurface (IIM) backed dual-layered sub-6 GHz, dual-band microstrip patch antenna (MPA) has been reported. A complete tensor surface impedance matrix (Z(surf)) characterization of IIM along with 3 x 3 unit cell has been derived. The proposed antenna exhibits a sub-6 GHz dual-band response at f(r) = 3.54 and 4.375 GHz with an overall footprint of 0.19 ${{\lambda }_0} \times $ 0.19 ${{\lambda }_0}$; where ${{\lambda }_0}$ is the free space wavelength at 3.54 GHz. A platted through hole is loaded to suppress the higher-order mode effects. Polarization diversification due to IIM backing is characterized at each resonance frequency (${{f}_r}$) to observe the behavior of both orthogonal and bilinear modal currents of IIM through systematic simulation and measurement of the fabricated antenna.