Design of Linear-to-Circular Polarization Transformers Made of Long Densely Packed Metallic Helices

In this work, we study the realization of realistic polarization transformers formed by long metallic helices. To this end, we propose a new homogenization model to characterize the propagation of electromagnetic waves in a medium formed by infinitely long helices. We derive approximate analytical e...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2008-02, Vol.56 (2), p.390-401
Main Author: Silveirinha, M.G.
Format: Article
Language:English
Subjects:
Applied sciences
Artificial materials
chiral media
Composite materials
Electromagnetic modeling
Electromagnetic propagation
Electromagnetic scattering
Electromagnetic wave polarization
Exact sciences and technology
Exact solutions
Helices
Homogenization
Homogenizing
Magnetic analysis
Mathematical analysis
Metamaterials
Permeability
Permittivity
Polarization
polarization transformers
Radiocommunications
Radiowave propagation
Telecommunications
Telecommunications and information theory
Tensile stress
Transformers
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Summary:In this work, we study the realization of realistic polarization transformers formed by long metallic helices. To this end, we propose a new homogenization model to characterize the propagation of electromagnetic waves in a medium formed by infinitely long helices. We derive approximate analytical expressions for the effective permittivity, effective permeability and the magnetoelectric tensor of the composite material, taking into account the effects of spatial dispersion. We apply the new homogenization model to characterize novel linear-to-circular polarization transformers. Our results show that the metamaterial screen may be designed in such a way that an incoming linearly polarized wave may be transformed into a circularly polarized transmitted wave, and that the transmission efficiency of such polarization transformer may be as high as 95%.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2007.915428