Recent Advances in Huygens’ Metasurfaces

Chen, Michael; Dorrah, Ayman H.; Egorov, Gleb A.; Eleftheriades, George V.

doi:10.1109/metamaterials.2018.8534192

Cited by 4 publications

(2 citation statements)

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“…In their traditional form, they consist of two dielectric lenses of appropriate focal lengths to provide the required scaling to the beam radius. Recently, a pair of omega-bianisotropic Huygens' metasurfaces has been employed at microwaves to design a beam expander [25]. In [25] both metasurfaces are purely transmissive and act on the incident fields by adding an appropriate phase profile, so that the first serves as a diverging lens and the second as a converging lens with the designed focal lengths.…”

Section: B Beam Expansion For An Incident Gaussian Beammentioning

confidence: 99%

“…Recently, a pair of omega-bianisotropic Huygens' metasurfaces has been employed at microwaves to design a beam expander [25]. In [25] both metasurfaces are purely transmissive and act on the incident fields by adding an appropriate phase profile, so that the first serves as a diverging lens and the second as a converging lens with the designed focal lengths. However, this approach has limitations regarding the separation between the two metasurfaces for a desired scaling factor of the beam radius; as the distance between the two metasurfaces becomes smaller, the performance of the transformation is severely degraded.…”

Section: B Beam Expansion For An Incident Gaussian Beammentioning

confidence: 99%

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Design of Compact Huygens' Metasurface Pairs with Multiple Reflections for Arbitrary Wave Transformations

Ataloglou,

Dorrah,

Eleftheriades

2020

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Huygens metasurfaces have demonstrated a remarkable potential to perform wave transformations within a subwavelength region. In particular, omega-bianisotropic Huygens metasurfaces have allowed for the passive implementation of any wave transformation that conserves real power locally. Previous reports have also shown that Huygens metasurface pairs are capable of realizing transformations that break the local power conservation requirement by redistributing the total power, while the wave propagates between the two metasurfaces. However, the required separation distance overshadows the low-profile characteristics of the individual metasurfaces and leads to bulky designs, especially for lower frequencies. In this work, we develop a method of designing omega-bianisotropic Huygens metasurface pairs, relying on a point-matching process of the real power at the two metasurfaces. We highlight the versatility of our method by presenting two variations of the configuration, depending on whether the electromagnetic source is located within or outside the metasurface pair. Based on the examples of a cylindricalwave to plane-wave transformation and a beam expander, we examine the impact of multiple reflections, as a way to overcome the size limitations and design compact structures. Moreover, we explore possible beamforming applications through an example of a Taylor-pattern antenna with a single feed-point between the two metasurfaces.

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Section: B Beam Expansion For An Incident Gaussian Beammentioning

confidence: 99%

Section: B Beam Expansion For An Incident Gaussian Beammentioning

confidence: 99%