Dual Circularly Polarized Metasurface Antenna Based on Inward and Outward Surface Wave Duplexing

This article proposes the design and numerical validation of a dual-polarized metasurface (MTS)-based antenna, in which the two polarizations share the same circular aperture. The design exploits the interaction of duplexed inward- and outward-traveling surface waves (SWs) with an unwinding spiral M...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation Vol. 73; no. 5; pp. 2700 - 2712
Main Authors: Thanikonda, Ravikanth, Faenzi, Marco, Toccafondi, Alberto, Martini, Enrica, Maci, Stefano
Format: Journal Article
Language:English
Published: New York IEEE 01.05.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Anisotropic
Antenna feeds
Antennas
Aperture antennas
Apertures
Boundary conditions
Broadband
Circular polarization
Cylindrical waves
dual polarization
Dual polarization (waves)
Handedness
Impedance
leaky wave (LW)
metasurface (MTS)
Metasurfaces
Modulation
Parallel plates
Polarization
Surface impedance
Surface waves
Tensors
triaxial feeding system (TFS)
Waveguides
ISSN:0018-926X, 1558-2221
Online Access:Get full text
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Summary:This article proposes the design and numerical validation of a dual-polarized metasurface (MTS)-based antenna, in which the two polarizations share the same circular aperture. The design exploits the interaction of duplexed inward- and outward-traveling surface waves (SWs) with an unwinding spiral MTS impedance pattern. The two inward/outward illuminations share a common radiating aperture and are originated by an integrated triaxial-cable feeding. The inward cylindrical wave is launched in a parallel plate waveguide (PPWG) by the external part of the triaxial cable (TC) and then redirected inward by a corner reflector at the aperture rim. Interacting with the anisotropic-modulated impedance boundary condition (IBC), it provides a broadside left-handed circularly polarized (LHCP) beam. On the other hand, the outward SW originates from the center as excited by a monopole connected to the inner conductor of the TC and provides a right-handed circularly polarized (RHCP) broadside radiation. New design formulas are derived for the total efficiency of the two modes. A practical feeding structure is designed and validated, featuring a coplanar-to-triaxial waveguide transition for broadband performance, ensuring a low-profile and simple configuration.
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ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2025.3529257