Dual circularly polarized broadside beam antenna based on metasurfaces

Design details of a Ku band metasurface (MTS) antenna with dual circularly polarized (CP) broadside radiation is shown in this work. By means of the surface impedance tensor modulation, synchronized propagation of two transversal magnetic (TM) and transverse electric (TE) surface waves (SWs) is ensu...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-02, Vol.963 (1), p.12006
Main Authors: Tellechea, A, Caminita, F, Martini, E, Ederra, I, Teniente, J, Iriarte, J C, Gonzalo, R, Maci, S
Format: Article
Language:English
Subjects:
Antennas
Circular polarization
Leaky waves
Metasurfaces
Physics
Radiation
Septum
Substrates
Surface waves
Tensors
Wave propagation
Waveguides
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Summary:Design details of a Ku band metasurface (MTS) antenna with dual circularly polarized (CP) broadside radiation is shown in this work. By means of the surface impedance tensor modulation, synchronized propagation of two transversal magnetic (TM) and transverse electric (TE) surface waves (SWs) is ensured in the structure, which contribute to the radiation in broadside direction by the generation of a CP leaky wave. The structure is implemented by elliptical subwavelength metallic elements with a cross-shaped aperture in the center, printed on top of a thin substrate with high permittivity (AD1000 with a thickness of λ0/17). For the experimental validation, the MTS prototype has been excited employing an orthomode transducer composed by a metallic stepped septum inside an air-filled waveguide. Two orthogonal TE11 modes excited with ±90° phase shift in the feed couple with the TM and TE SWs supported by the MTS and generate RHCP or LHCP broadside beam. Experimental results are compared with the simulation predictions. Finally, conclusions are drawn.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/963/1/012006