Circularly Polarized Graphene Antenna for THz Applications

Abstract

This manuscript reports a single substrate (silica) terahertz graphene plasmonic antenna having slotted circular patch for circular polarization, resonant at frequency of 1THz. The variation of graphene’s complex conductivity & propagation of transverse magnetic surface plasmon polariton are verified. To improve the performance of the proposed antenna a dual substrate structure is presented (by adding silicon below silica), and analyzed. By parametric variation appropriate height of substrate is calculated. Graphene’s tunability is verified using variation in its chemical potential $(\mu_{c}$). Using proper values of $\mu_{c}$ & relaxation time, the dual substrate, circularly polarized, graphene plasmonic THz antenna is designed, providing gain of 4. 318dBi, radiation efficiency of 85% with total efficiency of 62% & 3-dB axial ratio bandwidth of 100GHz.