Dispersion properties of glide-symmetric corrugated metasurface waveguides

In this paper, a mode-matching procedure is used to prove for the first time the dispersionless behavior of glide symmetry (GS) in corrugated metasurface waveguides. Depending on their field symmetry, the Floquet harmonics have a different impact onto the frequency dispersion, which is reduced with...

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Veröffentlicht in:International journal of microwave and wireless technologies 2024-02, Vol.16 (1), p.13-20
Hauptverfasser: Fischer, Boris, Valerio, Guido
Format: Artikel
Sprache:eng
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Zusammenfassung:In this paper, a mode-matching procedure is used to prove for the first time the dispersionless behavior of glide symmetry (GS) in corrugated metasurface waveguides. Depending on their field symmetry, the Floquet harmonics have a different impact onto the frequency dispersion, which is reduced with GS when the gap between the surfaces is small. Indeed, the glide-symmetric waveguide is shown to have the same effective propagation features as a scaled mirror-symmetric waveguide with half the period and a doubled gap. We propose closed-form formulas for the effective refractive index of the glide-symmetric waveguide in the first Brillouin zone, having a small groove compared to the period. The closed-form expressions analytically prove the dispersionless behavior of GS.
ISSN:1759-0787
1759-0795
DOI:10.1017/S1759078723000090