Enhancement of Phase-Shifting Nonreciprocity in Microstrip-Line-Based Metamaterials with Curvatures

摘要

New approach to enhance phase-shifting nonreciprocity of microstrip-line-based metamaterials with normally magnetized ferrite substrates is proposed by using a combination of curvature of the line and asymmetric insertion of shunt inductive stubs. Numerical simulation and measurement results clearly show that the nonreciprocity for the case where the shunt inductive stubs are asymmetrically inserted to the inner side of the curved line was greater than that for another case where the shunt stubs are inserted to the outer side of the curved line. Decrease in radius of the curvature increases the geometrical asymmetry resulting in enhancement of the nonreciprocity.