Band Pass Filter Based on Double Split Ring Resonator for 5G Applications

Compact, affordable, high-performing, and easily integrable microwave filters are essential for advancements in communication. This study investigates a planar band pass filter that is loaded with a double split ring resonator that serves as a metamaterial for 5G applications. The initial phase of the work focuses on verifying the metamaterial unit cell using the Nicholson-Ross Weir technique, which provides evidence of the split ring resonator's negative permittivity and negative permeability. The band pass filter in the second section is designed using ANSYS HFSS software on a FR4 substrate. The substrate has a dielectric constant of 4.4, a loss tangent of 0.025, and a thickness of 1. 6mm. Parametric analysis is conducted to optimize the dimensions of the split ring resonator and the band pass filter. The band pass filter, which utilizes metamaterial, exhibits a return loss of 30.41dB and an insertion loss of 1.77dB at a frequency of 4.71 GHz. Similarly, at a frequency of 6 GHz, it demonstrates a return loss of 27.91 dB and an insertion loss of 1.28 dB. These characteristics make it appropriate for sub7GHz 5G NR-Light applications. The band pass filter is compact, measuring 21.2mm in length and 11.8mm in width.