On the Design of Gyroelectric Resonators and Circulators Using a Magnetically Biased 2-D Electron Gas (2-DEG)

This paper presents a theoretical investigation into the feasibility of designing tunable resonators and circulators exploiting the gyroelectric behavior of the high-mobility 2-D electron gas (2-DEG). Operational regions are assigned and the resonant and perfect circulation conditions for 2-DEG materials analyzed to demonstrate the potential of the design. Performance of the designed resonators and circulators are verified by inspecting the scattering parameters resulting from a Green's function approach and full-wave electromagnetic simulation of the structures. Theoretical results prove the possibility of building planar 2-DEG based resonant microwave devices to work below the cyclotron frequency. Moreover, a 2-DEG circulator working in the same frequency range is theoretically feasible providing a high steady magnetic field is applied. A microwave circulator based on a magnetically biased 2-DEG cooled to 77 K is presented to work at 200 GHz in the presence of a 2.5-T magnetic field bias.