Fully Metallic Luneburg Metalens Antenna in Gap Waveguide Technology at V-Band

This paper presents the design of a flat Luneburg metalens antenna at V-band using Gap Waveguide (GW) technology. The metalens consists of a parallel plate waveguide loaded with metallic pins whose height is modulated to get an effective refractive index that follows the Luneburg equation. A Groove...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2023-04, Vol.71 (4), p.1-1
Main Authors: Perez-Quintana, Dayan, Bilitos, Christos, Ruiz-Garcia, Jorge, Ederra, Inigo, Teniente-Vallinas, Jorge, Gonzalez-Ovejero, David, Beruete, Miguel
Format: Article
Language:English
Subjects:
Antenna radiation patterns
Antennas
Engineering Sciences
Flat surfaces
gap waveguide technology
Grooves
Horn antennas
Lenses
Luneburg lens
metalens
metasurface
Millimeter waves
Nails
Parallel plates
Pins
Reflectance
Refractive index
Refractivity
Substrates
Wave fronts
Wave propagation
Waveguides
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Summary:This paper presents the design of a flat Luneburg metalens antenna at V-band using Gap Waveguide (GW) technology. The metalens consists of a parallel plate waveguide loaded with metallic pins whose height is modulated to get an effective refractive index that follows the Luneburg equation. A Groove Gap Waveguide (GGW) H-plane horn is used to illuminate the metalens, such that the rays are collimated and a planar wavefront is generated in the direction of propagation. Since the structure at hand is planar, it can be efficiently integrated on flat surfaces. Moreover, the fully metallic structure is mechanically robust and presents lower losses than lenses including dielectric substrates. A prototype has been fabricated and tested, simulations and experimental results are in very good agreement. The metalens yields an input reflection coefficient (S 11 ) below -10 dB from 45 to 70 GHz, whereas the -3dB gain fractional bandwidth is 26.2% with respect to a center frequency of 60 GHz, with a peak of 22.5 dB at 61 GHz. These features make this design an interesting solution for millimeter-wave applications.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2023.3243277