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

Andrey POROKHNYUK  Tetsuya UEDA  Yuichi KADO  Tatsuo ITOH  

IEICE TRANSACTIONS on Electronics   Vol.E96-C    No.10    pp.1263-1272
Publication Date: 2013/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.1263
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Emerging Technologies and Applications for Microwave and Millimeter-Wave Systems)
metamaterials,  leaky-wave antennas,  electromagnetic analysis,  transmission line matrix methods,  beam steering,  ferrite devices,  

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Phase-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.