An Integral-equation technique for solving thick irises in rectangular waveguides

Abstract

Abstract-This paper presents an efficient integral-equation (IE)technique for analysis of thick irises inside multilayered rectangular waveguides. The IEs remain the same as in the case of zerothickness iris and the thickness is accounted for only as a correction term in the IE kernel. This technique halves the number of unknowns on the iris, thus leading to computational effort and simulation times comparable to the zero-thickness case. In this paper, two efficient ways for computing the correction term are introduced and the accuracy of the approach is discussed on several waveguide structures and filters.

Integral-Equation Analysis of 3-D Metallic Objects Arranged in 2-D Lattices Using the Ewald Transformation

“…In the case of a periodic structure with identical planar apertures of arbitrary shape periodically perforated in the plane, the reflection and transmission coefficients are computed as shown in [27].…”

On the Coupling Integrals Arising in the Method of Moments Formulation of Laterally Bounded Structures

“…The solution of the coupling integrals presented so far is subject to the election of appropriate boundary conditions, or equiv-alently, to the substitution of pertinent scalar potential functions in (25). In this section, we will obtain the solution to these integrals, and therefore to any coupling integrals using subsectional basis functions, in three practical boundary conditions, namely boundaries with rectangular and circular perfect electric conductor and a 2-D periodic boundary condition.…”

“…Substituting the expressions for the th rectangular mode [16] into (25) and after some simple manipulations we obtain …”

Experimental investigation of frequency characteristics of the multistage slot membranes waveguide filters

“…There are a lot of papers of waveguide filters with metal membranes, which are arranged perpendicular to the direction of propagation of electromagnetic waves [1][2][3][4][5]. These works cover a large historical period: from 1946 [1] to 2000-ies [2][3][4][5].…”

“…These works cover a large historical period: from 1946 [1] to 2000-ies [2][3][4][5]. These filters are called «iris filters» ( [3][4][5]). However, it is more convenient to name them "filters with the waveguideslot membranes" (FWSM).…”