High Q and High EMR Hepta Band Single Layer Metasurface Absorber for EMI and Sensing Applications in C, X, Ku, K and Ka Band

This manuscript presents a metamaterial based on a modified asymmetric circular split ring resonator for absorber applications in the biomedical regime. This metamaterial absorber (MMA) exhibits seven absorption peaks to cover C, X, Ku, K and Ka band applications with substrate height 1.5mm. Proposed Metamaterial Absorber (MMA) unit cell is formed on a low-cost FR4 substrate. The resonator of the unit cell is structured with four concentric intercoupled circular split rings. The absorber demonstrates multiple absorption peaks at 5.76, 10.39, 16.78, 18.49, 21.91, 29.81 and 35.06 GHz with absorption of 89.81, 99.5, 99.98, 99.61, 99.52, 99.95 and 98.47%, respectively. Metamaterial absorber properties are investigated by surface current, electric, and magnetic fields. The unit cell exhibits single negative metamaterial properties with an effective medium ratio (EMR) of 6.47 and quality factor (Q-factor) of 73.968 at frequency of 18.492 Hz. Besides that, the equivalent circuit of the MMA unit cell is patterned and validated by comparing S11 obtained from and CST software. The MMA array's absorption properties are also examined in the simulations. Measured results of the unit cell and array corresponds well with the result of simulation in terms of absorption at intended frequencies. Given its good EMR, superior quality factor, and high maximum absorption, the MMA can be a good candidate for a multiband absorber for applications like sensing, detecting, and further it can be used for sensing in biomedical application as it is hepta-band and have high absorptivity.