Alternative Titleアンテナ応用のための非相反CRLHメタマテリアルの設計
Note (General)Phase-nonreciprocal 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 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. The present approach simplifies the design of leaky wave antennas without beam-squinting, and such antenna design is proposed. The nonreciprocal metamaterial design is also proposed for circular beam antenna with switchable direction of circular polarization. Based on the principles formulated for ferrite-embedded microstrip line based metamaterial, a coplanar design with enhanced magnitude in nonreciprocity is proposed.
This work includes results of simplified electromagnetic field analysis, numerical simulation and experimental results. Important conclusions are given on the basis of analytic approach and extended to design of nonreciprocal metamaterials with enhanced properties and new antenna types.
Collection (particular)国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
Date Accepted (W3CDTF)2015-05-01T13:23:17+09:00
Data Provider (Database)国立国会図書館 : 国立国会図書館デジタルコレクション