Wave Propagation in Periodic Metallic Structures with Equilateral Triangular Holes

摘要: 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 structure possessing glide and mirror symmetries. Both structures present an unexpected high degree isotropy, despite triangle not being symmetric respect rotations 90 •. We give some physical insight on matter by carrying out modal decomposition total field hole identifying most significant modes. Additionally, we demonstrate that electrical size plays fundamental role mechanism causes isotropic behavior. Finally, characterize influence different geometrical parameters conform unit cell (period, size, depth, separation between metallic plates). The glide-symmetric configuration offers higher equivalent refractive indexes widens stopband compared mirror-symmetric configuration. show wider as bigger, unlike holey composed circular elliptical holes where optimal exists.