In this work, we study the dispersion characteristics of the first modes of four
periodic structures implemented in Substrate IntegratedWaveguide (SIW) technology.
Two kind of topologies (based on inductive irises and on rectangular air
holes) and two kind of symmetries (normal reflection and glide symmetry) are
studied by using electromagnetic simulation software. The obtained results show
relevant differences in the characteristics of passbands and stopbands between
glide-symmetric and non-glide-symmetric structures. The dispersion characteristics
of the first propagating mode are analyzed for finite implementations of
all the studied structures. Furthermore, the finite implementations of the structures
based on inductive irises have been fabricated and measured, showing good
agreement with the simulation results.