Design of sub-6 GHz antenna using negative permittivity metamaterial for 5G applications

The objective of the presented article is to design a compact multiband metamaterial antenna that meets the frequency requirement of 5G. The antenna is designed using High Frequency structure simulator that implements finite element method. Four Hexagonal complementary split ring resonators acts as metamaterial and is embedded on the monopole. The addition of CSRR (complementary split ring resonator) on hexagonal monopole introduces negative permittivity in the material and produces band of frequencies that operate under sub-6 GHz. The existence of metamaterial characteristic (negative permittivity) is verified and extracted through simulation in CST (Computer simulation tool) with the help of finite integration technique. The equivalent electrical circuit of the resonating structure is modelled and discussed. The prototype is constructed with size of 20 × 20 × 1. 6mm3 on FR4 substrate and measured. The reflection coefficient over the entire frequency range is less than −10 dB and has good impedance matching. The VSWR is below 2 and the antenna meets the present demand for 5G applications in sub 6 GHz.