Analysis of the dispersion characteristics in periodic Substrate Integrated Waveguides
In this work, we study the dispersion characteristics of the first modes of four periodic structures implemented in Substrate Integrated Waveguide (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.