Design of post-wall waveguides with metal and dielectric posts

Abstract

Abstract-Post-wall waveguides can fulfill the requirements for low-loss transmission lines and components in the interconnection between antenna and front-end electronics. In this paper we present a model based on an element-by-element method for simulating wave propagation in metallic and dielectric post-wall waveguides. We demonstrate that both types of waveguides support wave propagation and we show that undesired resonances can limit the range of operation.

An electromagnetic model for post-wall waveguide building blocks

“…In the analysis approach discussed in [3], [4], we focus on the TE n0 modes in PWWG for which the electric field is of the form E = E y (x, z) i y , where the unit vector i y is directed along the posts. For small to moderate substrate heights, these modes predominantly describe the electromagnetic behavior of a PWWG.…”

“…In our alternative analysis approach, we employ the same assumption for the electric field as in [3], [4] to characterize a section of a PWWG with arbitrary positioning of the posts between two interfaces or ports. A top view of such a section is shown in Fig.…”

“…A prerequisite for implementing the library is the availability of a fast numerical tool that can compute the scattering matrices of different types of components. In [3], [4] we developed a model for the analysis of straight guides, in particular to calculate the (real part of the) propagation constant of such guides. This model is based on the infinite-array approximation in which symmetry considerations are used to reduce the analysis to a single unit cell.…”

An Analysis Technique for Post-Wall Waveguides

“…In [20] we presented a method for analyzing finite-length post-wall waveguides based on a Galerkin MoM approach for the case of metallic posts and a field expansion method for post-wall waveguides with small dielectric posts. We took a first step toward a unified analysis of post-wall waveguides by means of a field expansion technique in [21] and we identified unwanted resonances inside the walls that can limit waveguide performance.…”

Analysis and design of post-wall waveguides for applications in SIW

“…Several of these are addressed in this thesis and the publications stemming from this work [30][31][32][33][34][35], both from the point-of-view of analysis and simulation as well as that of design, manufacturing, and measurement.…”