Transmission lines emulating moving media

In this paper, we show how the electromagnetic phenomena in moving magnetodielectric media can be emulated using artificial composite structures at rest. In particular, we introduce nonreciprocal periodically loaded transmission lines, which support waves obeying the same rules as plane electromagne...

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Bibliographic Details
Published in:New journal of physics 2014-09, Vol.16 (9), p.93065-20
Main Authors: Vehmas, J, Hrabar, S, Tretyakov, S
Format: Article
Language:English
Subjects:
Circuits
Composite structures
Electromagnetic fields
Electromagnetic radiation
Electromagnetic waves
electromagnetics
Media
metamaterial
moving media
nonreciprocity
Physics
Rest
Transformations
transmission line
Transmission lines
Unit cell
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Summary:In this paper, we show how the electromagnetic phenomena in moving magnetodielectric media can be emulated using artificial composite structures at rest. In particular, we introduce nonreciprocal periodically loaded transmission lines, which support waves obeying the same rules as plane electromagnetic waves in moving media. Because the actual physical structure is at rest, in these transmission lines there are no fundamental limitations on the velocity values, which may take values larger than the speed of light or even complex values (considering complex amplitudes in the time-harmonic regime). An example circuit of a unit cell of a 'moving' transmission line is presented and analyzed both numerically and experimentally. The special case of a composite right-/left- handed host line is also studied numerically. Besides the fundamental interest, the study is relevant for potential applications in realizing engineered materials for various transformations of electromagnetic fields.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/16/9/093065