Design and investigation on circularly polarized tunable two port silicon ceramic-graphene based hybrid filtenna in THz frequency regime

This communication discusses and examines a dual port filtering hybrid (Silicon-graphene) based antenna. The main appearances of the designed THz radiator are: (i) a modified circular patch created \({\mathbf{HEM}}_{{11{{\varvec{\updelta}}}}}^{{\mathbf{x}}}\) ${\mathbf{HEM}}_{11\mathbf{\delta }}^{\mathbf{x}}$ and \({\mathbf{HEM}}_{{11{{\varvec{\updelta}}}}}^{{\mathbf{y}}}\) ${\mathbf{HEM}}_{11\mathbf{\delta }}^{\mathbf{y}}$ inside silicon ceramic, which in turn created a circularly polarized wave from 2.59 to 2.89 THz (axial ratio ≤3 dB); (b) a defected ground structure (DGS) along with patch creates band pass filtering features (5.0 dBi within the operating band and −15 dBi outside the operating band) within the operating band; and (c) coating of graphene material over the ceramic adds the re-configurability feature in proposed radiator. The designed radiator works effectively in between 2.49 and 3.29 THz (|S₁₁|≤ −10 dB) with more than 25 dB isolation (due to orthogonal orientation). Due to the aforementioned features, the designed radiator is employable for different wireless THz applications.