A low magnetic bias sub-millimetre wave semiconductor junction circulator

Abstract

This paper presents a design for a semiconductor junction circulator to work in the sub-millimetre wave frequency range. An InSb disk is modelled for a low steady applied axial magnetic field. An approach was utilised to design the circulator with minimum required magnetic biasing by exploiting a frequency range above the extraordinary wave resonant frequency. Circulation at frequency of 650GHz with about 9% 10dB bandwidth was predicted using an applied magnetic field as low as 0.2T. The Green's function description is verified using a commercially available electromagnetic simulation package with resultant electromagnetic field patterns given.