A waveguide hybrid coupler (10) is formed with a pair of waveguides (12, 14) of rectangular cross section and sharing a common sidewall (22). An aperture (24) in the sidewall provides for the coupling of electromagnetic energy between a first of the waveguides and a second of the waveguides. An input terminal (26) is located at an end of the first waveguide. A pair of stepped, multi-tiered abutments (44) are disposed on the outer sidewalls (20) of the waveguides opposite the coupling aperture. The dimensions of the abutment steps are selected to stagger-tune the frequency response of the coupler to achieve wideband operation.
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