Design of a Polarization-insensitive Wideband Metamaterial Absorber in Mid-band of Sub-6 GHz for 5G

The mid-band of sub-6 GHz for 5G applications, i.e., from 3 to 6 GHz frequency band, is widely used because of its high data rate, wide coverage area and connectivity, low latency, and less sensitivity to interference. This article proposes a wideband metamaterial absorber consisting of a ring and split ring loaded with lumped resistors. The absorption bandwidth includes the bands of n77, n78, and n79, which range from 2.85 to 6.82 GHz with absorptivity of 90%. The proposed absorber provides the same absorptivity with a fractional bandwidth of 82% and is completely insensitive to polarization.