In an example embodiment, a waveguide combiner/divider comprises: a first waveguide including a first major ridge extending to a waveguide junction; a second waveguide including a second major ridge extending to the waveguide junction, the second major ridge connected to the first major ridge at a major ridge junction within the waveguide junction; and a third waveguide including a third major ridge extending to the waveguide junction, the third major ridge connected to the major ridge junction via a major ridge transition section, the major ridge transition section having a major ridge transition section height within the waveguide junction that is less than heights of the first major ridge and second major ridge.
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