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
$({\overline{\overline {{{Z}_{\mathrm{surf}\ }}}} })$
characterization of IIM along with 3 × 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.