Mode Analysis of Phase-Constant Nonreciprocity in Ferrite-Embedded CRLH Metamaterials

Abstract

SUMMARYPhase-nonreciprocal ε-negative and CRLH metamaterials are analyzed using a new approach in which field analysis and transmission line model are combined. The examined one-dimensional nonreciprocal metamaterials are composed of a ferrite-embedded microstrip line periodically loaded with shunt stubs. In the present approach, the phase constant nonreciprocity is analytically estimated and formulated under the assumption of operating frequency far above the ferromagnetic resonant frequency. The present approach gives a good explanation to the phenomenon in terms of ferromagnetic properties of the ferrite and asymmetric geometry of the metamaterial structure, showing a good agreement with numerical simulations and experiment. key words: metamaterials, leaky-wave antennas, electromagnetic analysis, transmission line matrix methods, beam steering, ferrite devices

Metamaterials with magnetism and chirality

“…Several recent works [141][142][143][144][145] on ferrite-based magnetic metamaterials have been devoted to controlling non-reciprocal phase gradient of the field profile for applications to antennas and sensing technologies. Phase-shifting non-reciprocity enhancement [146,147] and optimal dispersion design, such as dispersion-less non-reciprocity [148] will open up new applications of non-reciprocal metamaterials.…”