Abstract
In this paper, a directional coupler is proposed for rectangular waveguides. Coupling and scattering problems are analyzed when the fundamental compound mode is incident by the mode-matching method in the sense of least squares. This coupler is composed of two rectangular waveguides placed in dielectric media. A periodic groove structure of finite extent is formed on the surface of one of two waveguides. The incident fundamental compound mode is coupled with other higher compound modes through the periodic groove structure.
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