Implementing the circularly polarized THz antenna with tunable filtering characteristics

Abstract

An ultra-wideband (UWB) terahertz (THz) antenna is designed and numerically analyzed. A technique is implemented for obtaining the filtering characteristics in the antenna response. A graphene sheet is placed in antenna structure for achieving the filtering response. The variation in the surface conductivity of the covered area by graphene sheet provides the variable field confinement in antenna structure. This way helps in generating the filtering characteristics in UWB response of antenna. Also, the variation in the electrical properties of graphene material provides the tunability in the generated notched frequency band. The antenna utilizes the feeding with the orthogonal stubs associated with it which helps in providing the circularly polarized response. Furthermore, the antenna operation is verified with the electrical circuit model.