Polarization-independent fractal square splits ring resonator (FSSRR) multiband metamaterial absorber/artificial magnetic conductor/sensor for Ku/K/Ka/5G (mm-Wave) band applications

A fractal square splits ring resonator (FSSRR) based metamaterial structure for multiband absorber (MMA) and reflector application has been presented in this paper. The design achieved five absorption peaks over Ku, K and Ka/5G frequency bands at 16.75 GHz, 19.60 GHz, 24.26 GHz, 26.62 GHz, and 30.05 GHz frequencies with 98 %, 98 %, 95 %, 99.9 % and 99.9 % of peak absorption, respectively. A detailed transverse electric (TE) and transverse magnetic (TM) polarization analysis showed unique absorption properties due to the symmetric rotational structure. The MMA properties were also investigated by equivalent circuit model, electric field and magnetic field distribution. The non-absorbing frequency can also reflect the electromagnetic wave, which has been characterised as an artificial magnetic conductor (AMC). Finally, the proposed design has been fabricated, and the measured results agree well with the simulated one. This high absorption performance of the proposed absorber leads it to permittivity sensing, 5G antenna performance enhancement etc.