Abstract Interlayer transitions for various types of EBG waveguides that represent two-layer structures in which the waveguides are coupled along a wide wall using a metal probe passing through a hole in the walls are studied. It is shown that such transitions are well matched in a frequency interval of 8–12 GHz and have characteristics of a bandpass filter. A parametric analysis of the transitions was used to determine for each type of waveguide the dependence of the position of the minima of the reflection coefficient on the parameters of the transition and to find the best combinations of parameters for balanced matching in the entire frequency band. It is shown that the matching is virtually independent of the mutual orientation of the axes of the waveguides on two layers. The characteristics of the interlayer transition are also calculated for a standard rectangular metal waveguide that is used at the input and output of the transition for EBG waveguides. It is shown that its matching characteristic is almost identical to the matching characteristic of the transition for a three-row EBG waveguide.
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