Wave Propagation in Periodic Metallic Structures with Equilateral Triangular Holes
Metadatos
Mostrar el registro completo del ítemAutor
Alex Amor, Antonio; Valerio, Guido; Ghasemifard, Fatemeh; Mesa Aguado, Francisco Luis; Padilla De La Torre, Pablo; Fernández-González, José M.; Quevedo Teruel, ÓscarEditorial
MDPI
Materia
Periodic structures Equilateral triangular holes Mode-matching Dispersion analysis Glide symmetry Mirror symmetry
Fecha
2020-02-28Referencia bibliográfica
Alex-Amor, A., Valerio, G., Ghasemifard, F., Mesa, F., Padilla, P., Fernández-González, J. M., & Quevedo-Teruel, O. (2020). Wave Propagation in Periodic Metallic Structures with Equilateral Triangular Holes. Applied Sciences, 10(5), 1600.
Patrocinador
This work was partially funded by the Spanish Ministerio de Ciencia Innovación y Universidades under the project TIN2016-75097-P, and with European Union FEDER funds under projects TEC2017-84724-P and TEC2017-85529-C3-1-R, by the French National Research Agency Grant Number ANR-16-CE24-0030, by the Vinnova project High-5 (2018-01522) under the Strategic Programme on Smart Electronic Systems, and by the Stiftelsen Åforsk project H-Materials (18-302).Resumen
This paper studies wave propagation in a periodic parallel-plate waveguide with equilateral
triangular holes. A mode-matching method is implemented to analyze the dispersion diagram of the
structure possessing glide and mirror symmetries. Both structures present an unexpected high degree
of isotropy, despite the triangle not being symmetric with respect to rotations of 90º. We give some
physical insight on the matter by carrying out a modal decomposition of the total field on the hole and
identifying the most significant modes. Additionally, we demonstrate that the electrical size of the
triangular hole plays a fundamental role in the physical mechanism that causes that isotropic behavior.
Finally, we characterize the influence of the different geometrical parameters that conform the unit
cell (period, triangle size, hole depth, separation between metallic plates). The glide-symmetric
configuration offers higher equivalent refractive indexes and widens the stopband compared to the
mirror-symmetric configuration. We show that the stopband is wider as the triangle size is bigger,
unlike holey structures composed of circular and elliptical holes where an optimal hole size exists.