Graphene 3-port circulator based on edge-guide mode propagation

Abstract

In this work we propose and numerically analyze a new type of electromagnetic circulator operating in THz region. The circulator is based on graphene and dielectric substrates. The structure resembles a known three-port microstrip circulator based in edge guided mode. The circulation behaviour is provided by application of a DC magnetic field normal to the graphene plane. In the frequency band (2 ÷ 7) THz the isolation loss of our ultra wideband circulator is −(15 ÷ 50) dB, the insertion loss is −(2 ÷ 5) dB and return loss is better than −10 dB. The chemical potential of the graphene is 0.1 eV and DC magnetic field is 2 T.